O objetivo deste estudo foi realizar ensaios de adsorção dinâmica, em coluna de leito fixo sem etapa regenerativa, para tal finalidade utilizou-se como adsorventes o carvão ativado comercial e material adsorvente à base de lodo biológico, para o tratamento de sulfeto de hidrogênio em corrente gasosa e obtenção das capacidades de adsorção. O lodo foi obtido de forma bruta em estação de tratamento de efluentes de abatedouro de aves, e tratado por processos térmicos e químicos em laboratório, para a geração de adsorvente. A concentração de H2S alimentada foi de 500 ppm na coluna, presente em duas misturas gasosas, uma com N2 e H2S, e outra mistura simulando o biogás contendo CO2, CH4 e H2S. As concentrações de H2S foram monitoradas por meio de um analisador de gás conectado a saída da coluna. Usou-se a técnica de interpretação das curvas de efluência para a determinação da capacidade de adsorção dos adsorventes estudados. Os resultados obtidos nesse trabalho indicaram que o aparato experimental usado não se mostrou viável para a adsorção com adsorvente à base de lodo. No entanto foi possível aumentar sua área superficial por meio dos tratamentos submetidos, passando de 0,005 g/m² na condição de lodo seco, para 86,4 g/m² depois de tratado. O lodo tratado com ácido sulfúrico mostrou maior capacidade de adsorção para a vazão de 4,0 L/min, apresentando remoção média de 0,21 mg H2S/g lodo. O carvão ativado comercial se apresentou propício para a remoção de H2S nas duas correntes gasosas, apresentando uma capacidade de adsorção média de 2,70 mg H2S/g carvão para a mistura gasosa simulando biogás e 1,26 mg H2S/g carvão para a corrente gasosa formado por nitrogênio e sulfeto de hidrogênio. / The objective of this study was to perform dynamic adsorption tests in fixed-bed column without regenerative stage, for this purpose it was used as adsorbents commercial activated carbon and biological sludge-based adsorbent material, for the treatment of hydrogen sulfide in the gas stream and obtaining the adsorption capacities. The sludge was obtained in raw form in treatment effluent plant from slaughterhouse poultry, and treated by thermal and chemical processes in the laboratory, to generate adsorbent. The concentration of H2S fed was 500 ppm in the column, present in two gas mixtures, one with N2 and H2S, and other mixing simulating the biogas containing CO2, CH4 and H2S. The H2S concentration was monitored by a gas analyzer connected to the outlet of the column. It was used breakthrough curves to determine the adsorption capacity of the adsorbents studied. The results of this work indicated that the experimental apparatus used was not suitable for adsorption with sludge-based adsorbent. However it was possible to increase the surface area through of undergoing treatments, from 0.005 g/m² on dry sludge condition to 86.4 g/m² after treated. The treated sludge with sulfuric acid showed a higher adsorption capacity for the flow rate of 4.0 L/min, with an average removal of H2S 0.21 mg/g sludge. The commercial activated carbon proved itself suitable for the removal of H2S in the two gas streams, with an average adsorption capacity of 2.70 mg H2S/g carbon for the gaseous mixture simulating biogas and 1.26 mg/g carbon for the gaseous stream consisting of nitrogen and hydrogen sulfide.

O H2S é um gás que causa preocupação devido aos efeitos que pode provocar a saúde, a corrosão sobre alguns materiais e a redução do poder calorífero no aproveitamento de biogás, mesmo quando presente em baixas concentrações. O uso de biogás como fonte energética tem crescido nos últimos anos, impulsionando a remoção do sulfeto de hidrogênio, uma vez que a presença de tal gás reduz a capacidade calorífica do biogás e causa danos às instalações. Diante disso, várias técnicas são utilizadas na remoção de H2S, sendo uma delas, a adsorção. Os processos de separação por adsorção são muito utilizados para a remoção de poluentes gasosos de misturas gasosas. Neste trabalho foram realizados experimentos da adsorção do H2S sobre lodo seco, em coluna de leito fixo, para obtenção da capacidade de adsorção dinâmica do lodo e como esta seria afetada pelas variáveis de processo: concentração de alimentação e vazão de alimentação. Para tanto, foi concebida e instalada uma unidade de bancada de adsorção em leito fixo, com facilidades experimentais necessárias para testes dinâmicos, com o emprego da técnica de interpretação de curvas de efluência, um método útil para a avaliação do desempenho de um adsorvente em colunas de leito fixo. Testes preliminares mostraram que a unidade de bancada apresentou versatilidade, podendo ser operada com vazões de até 5 L/ min e concentração de H2S na mistura gasosa de até 500 ppm. Os resultados obtidos mostraram que a capacidade de adsorção do lodo seco foi muito baixa, com valores variando de 3,30 x 10-5 a 2,54 x 10-3 mg de H2S/g de lodo seco e existência de caminhos preferenciais no leito. / It is widely known that H2S is a gas which causes preoccupation due to the potential risks to health, corrosion in materials and reduction of the calorific value, even when present in low concentrations. The application of biogas as an energetic source has increased in last years, promoting the hydrogen sulphide removal, so that H2S presence can reduce the biogas energetic capacity and cause damage in the installations. Therefore, many techniques are used to H2S removal, one them is adsorption. The adsorption separation processes are widely used in the removal of pollutants gaseous from gas mixtures. In this work, experiments were performed on the adsorption of H2S the dry sludge in a fixed bed column, aiming to obtain the dynamic adsorption capacity and how this would be affected by the process variables: feed concentration and feed flow rate . For that, we designed and installed a bench unit to fixed bed adsorption with necessary experimental facilities for dynamic tests with the use of the technique of interpretation breakthrough curves, an useful method for evaluating the performance of an adsorbent columns fixed bed . Preliminary tests showed that the bench unit has presented versatility and efficiency and it can be operated at flow rates up to 5 L/min and H2S concentration in the gas mixture up to 500 ppm. The results showed that the adsorption capacity of the dried sludge was very low , with values varied from 3.30 × 10-5 to 2.54 × 10-3 mg H2S/g of dry sludge and the existence of preferential paths in the bed .

Na região de Ribeirão Preto está localizado um dos pólos produtores de cana-de-açúcar uma das principais culturas da economia brasileira, com vasta área cultivada e uso intensivo de herbicidas, dos quais é preciso destacar o diuron e a hexazinona, pois ambos possuem elevado potencial de contaminação em águas superficiais e subterrâneas. Diversas tecnologias podem ser utilizadas para remover da água esses microcontaminantes, pelo fato de, neste caso, não ser eficiente a técnica de tratamento em ciclo completo (ou convencional). Neste trabalho de pesquisa foram investigadas as combinações de preoxidação com cloro e dióxido de cloro, de adsorção em carvão ativado pulverizado e granular, associadas ao tratamento em ciclo completo. A água de estudo foi preparada em laboratório, com características similares às do rio Pardo – futuro manancial para abastecimento da cidade de Ribeirão Preto, e fortificada com diuron e hexazinona. Ensaios de bancada feitos em jarteste e filtros de laboratório permitiram concluir que a adsorção em carvão ativado (pulverizado e granular) foi eficiente na remoção dos herbicidas. Foi construída e operada uma instalação piloto com colunas de adsorção, em carvão ativado granular, cujos resultados obtidos mostraram que a difusividade intrapartícula predominante entre o carvão e os herbicidas diuron e hexazinona pode ser considerada constante, em relação ao tamanho do grão de carvão ativado. Os resultados também possibilitaram a validação do método de ensaios rápidos em coluna de carvão ativado em escala reduzida, com vista à predição do tempo de ruptura de um filtro de carvão ativado granular em escala real. Para as condições ensaiadas, a adsorção em carvão ativado granular mostrou ser 12% mais eficiente que em carvão ativado pulverizado, cujas taxas de utilização foram de 10,7 e 12,0 miligrama de carvão por litro de água tratada, respectivamente. Foram dimensionados os sistemas para utilizar carvão ativado pulverizado e granular em uma ETA de 1 m3/s e contabilizados os custos de implantação e de operação. Embora os custos de implantação do sistema de carvão ativado granular tenham resultado da ordem de 3 vezes os do pulverizado, os custos totais em valor presente seriam igualados em 5 anos, podem ser até 23% menores em 20 anos – o que mostra a viabilidade técnico-financeira desta alternativa no tratamento de águas contaminadas com herbicidas. / Sugarcane is one of the major crops of the Brazilian economy and the city of Ribeirao Preto is in one of the largest sugarcane producing regions, with a vast sugarcane plantation area and intensive use of herbicides, especially diuron and hexazinone, which have high potential to contaminate surface waters and groundwater. Several different technologies can be used to remove these micro-contaminants from water since, in this case, conventional treatment is not an efficient technique. In the present study, the combinations of pre-oxidation with chlorine and chlorine dioxide and adsorption in powdered and granular activated carbon associated with the conventional treatment were investigated. The water sample investigated in this study was prepared in a laboratory with similar characteristics to that of the Pardo river - future source of water supply for the city of Ribeirao Preto - and supplemented with diuron and hexazinone. Bench-scale experiments performed using Jartest equipment and laboratory filters showed that the adsorption in activated carbon (powdered and granular) was effective in removing the herbicides. A pilot granular activated carbon column was built and operated, and the results showed that the prevailing intraparticle diffusivity between the carbon and the herbicides diuron and hexazinone can be considered constant, do not change with particle size. The results obtained also enabled the validation of the rapid small-scale column test (RSSCT) method to predict the full scale breakthrough time of a granular activated carbon filter. Under the conditions evaluated, the adsorption in granular activated carbon proved to be 12% more efficient than that in powdered activated carbon, whose carbon usage rates were 10.7 and 12.0 milligrams per liter of treated water, respectively. The systems were designed to use powdered and granular activated carbon in a 1 m3/s conventional water treatment plant, and the implementation and operation costs were calculated. Although the capital costs of the granular activated carbon system were about 3 times higher than those of the powdered activated carbon, these costs would be the same in 5 years and could even be 22% lower in 20 years, which shows the technical-financial feasibility of this alternative to the treatment of water contaminated with herbicides.

<p><strong>Introduktion:</strong> Svårigheter för vårdgivarna att hålla vårdgarantin var utgångspunkten för Sveriges Kommuner och Landsting (SKL) och Västra Götalandsregionen när de startade Genombrottsprojektet, ”Bättre flyt i opererande verksamheter”, det första som endast omfattade opererande verksamheter. Femton team från operationsavdelningar från hela landet deltog. Projektet pågick under år 2008. Alla team skulle uppnå resultatmålen att minst 90 % av patienterna opererades på första utlovade operationsdag och att 100 % av operationerna skulle starta på utsatt tid. Dessutom formulerade teamen egna processmål och balanserade mål. <strong>Syftet</strong> med studien var att beskriva teamdeltagarnas uppfattningar om att arbeta med genombrottsmetoden i opererande verksamheter. <strong>Metod:</strong> En totalundersökning där samtliga teamdeltagare i projektet (n=95) fick en webbenkät omfattande områdena resultat- och processmål, din arbetsplats, resultat och reflektioner. <strong>Resultat: </strong>Enkäten besvarades av 55</p><p>(58 %) teamdeltagare. Trettien redovisade att de nådde sina resultatmål under projekttiden. Processmålet operationsstart på utsatt tid nåddes helt eller delvis av 45 teamdeltagare och 32 lyckades minska bytestiderna. Tjugoen teamdeltagare uppgav att flera patienter per dag kunde opereras och 14 redovisade att de höll vårdgarantin efter projekttiden. De flesta teamdeltagarna ansåg att förankringen av projektet i personalgruppen fungerade bra, liksom stödet från handledarna. Att få tillräckligt med tid för möten, bemanningen på avdelningen och ledningens engagemang fungerade sämre. Avsaknad av ledningens stöd ledde till minskad motivation för förbättringsarbete.<strong> </strong>Teamdeltagarna ansåg vidare att Genombrottsmetoden var strukturerad och pedagogisk. Den gav helhetssyn på processer och reducerade dubbelarbete. Arbetsmiljön blev bättre. <strong>Konklusion:</strong> Teamdeltagarna ansåg att Genombrottsmetoden är användbar för att förbättra patientflödet och vårdkvaliteten på en operationsavdelning.</p> / <p><strong>Introduction:</strong> Difficulties for the caregivers to keep the national health care guarantee was the starting point for the Swedish Association of Local Authorities and Regions (SALAR) and The Västra Götaland Region when they started the project “Better flow in operating theatres”, based on the Breakthrough Series Model. Fifteen teams from operating theatres from the whole country participated. The project went on in 2008. All teams should achieve the result goals that at least 90 % of the patients should be operated on the day they were promised and 100 % of the operations should start in right time. In addition process goals and balanced goals were formulated by the teams. <strong>Purpose: </strong>The purpose of the study was to describe the team participants’ opinions about working with the Breakthrough Series Model in operating theatres. <strong>Method</strong>: All team participants (n=95) in the project received a<strong> </strong>questionnaire consisting of result- and process goals, your working place, results and reflections.</p><p><strong>Results: </strong>Fifty-five (58 %) of the team participants answered the questionnaire. Thirty-one of them achieved their result goals during the project time. Forty-five of the team participants achieved the process goal “operation start in right time” and 32 succeeded in decreasing turnover time. Twenty one of the team participants described that throughput increased and 14 were able to keep the national health care guarantee after the project time.  Most of the team participants considered that the support from the staff worked well, as well as the support from the supervisors. On the other hand there was not enough time for meetings, not enough staffing and the management commitment was not so good. The motivation for improvement work decreased due to lack of management support. The team participants considered the Breakthrough Series Model as systematic and educational. They also attained a comprehensive view of processes and reduced their work load. The work environment became better. <strong>Conclusion: </strong>The team<strong> </strong>participants thought that the Break through Series Model is a useful method for improving patient throughput and quality of care in an operating theatre.</p>

Introduktion: Svårigheter för vårdgivarna att hålla vårdgarantin var utgångspunkten för Sveriges Kommuner och Landsting (SKL) och Västra Götalandsregionen när de startade Genombrottsprojektet, ”Bättre flyt i opererande verksamheter”, det första som endast omfattade opererande verksamheter. Femton team från operationsavdelningar från hela landet deltog. Projektet pågick under år 2008. Alla team skulle uppnå resultatmålen att minst 90 % av patienterna opererades på första utlovade operationsdag och att 100 % av operationerna skulle starta på utsatt tid. Dessutom formulerade teamen egna processmål och balanserade mål. Syftet med studien var att beskriva teamdeltagarnas uppfattningar om att arbeta med genombrottsmetoden i opererande verksamheter. Metod: En totalundersökning där samtliga teamdeltagare i projektet (n=95) fick en webbenkät omfattande områdena resultat- och processmål, din arbetsplats, resultat och reflektioner. Resultat: Enkäten besvarades av 55 (58 %) teamdeltagare. Trettien redovisade att de nådde sina resultatmål under projekttiden. Processmålet operationsstart på utsatt tid nåddes helt eller delvis av 45 teamdeltagare och 32 lyckades minska bytestiderna. Tjugoen teamdeltagare uppgav att flera patienter per dag kunde opereras och 14 redovisade att de höll vårdgarantin efter projekttiden. De flesta teamdeltagarna ansåg att förankringen av projektet i personalgruppen fungerade bra, liksom stödet från handledarna. Att få tillräckligt med tid för möten, bemanningen på avdelningen och ledningens engagemang fungerade sämre. Avsaknad av ledningens stöd ledde till minskad motivation för förbättringsarbete. Teamdeltagarna ansåg vidare att Genombrottsmetoden var strukturerad och pedagogisk. Den gav helhetssyn på processer och reducerade dubbelarbete. Arbetsmiljön blev bättre. Konklusion: Teamdeltagarna ansåg att Genombrottsmetoden är användbar för att förbättra patientflödet och vårdkvaliteten på en operationsavdelning. / Introduction: Difficulties for the caregivers to keep the national health care guarantee was the starting point for the Swedish Association of Local Authorities and Regions (SALAR) and The Västra Götaland Region when they started the project “Better flow in operating theatres”, based on the Breakthrough Series Model. Fifteen teams from operating theatres from the whole country participated. The project went on in 2008. All teams should achieve the result goals that at least 90 % of the patients should be operated on the day they were promised and 100 % of the operations should start in right time. In addition process goals and balanced goals were formulated by the teams. Purpose: The purpose of the study was to describe the team participants’ opinions about working with the Breakthrough Series Model in operating theatres. Method: All team participants (n=95) in the project received a questionnaire consisting of result- and process goals, your working place, results and reflections. Results: Fifty-five (58 %) of the team participants answered the questionnaire. Thirty-one of them achieved their result goals during the project time. Forty-five of the team participants achieved the process goal “operation start in right time” and 32 succeeded in decreasing turnover time. Twenty one of the team participants described that throughput increased and 14 were able to keep the national health care guarantee after the project time.  Most of the team participants considered that the support from the staff worked well, as well as the support from the supervisors. On the other hand there was not enough time for meetings, not enough staffing and the management commitment was not so good. The motivation for improvement work decreased due to lack of management support. The team participants considered the Breakthrough Series Model as systematic and educational. They also attained a comprehensive view of processes and reduced their work load. The work environment became better. Conclusion: The team participants thought that the Break through Series Model is a useful method for improving patient throughput and quality of care in an operating theatre.

Abstract Hydrogen sulfide (H2S) is an environmentally hazardous, corrosive, and toxic gas, mostly generated in gas and oil industry. For small-scale natural gas processing sites (less than 10 tonne S/day), the use of regenerable iron oxide adsorbent to adsorb H2S from natural gas is still an economical and effective method. The objective of this research project was to understand the performance of an iron oxide adsorbent, recently emerging in the Canadian market, in removing H2S from gas streams. To accomplish this, the breakthrough behaviors of H2S adsorption in a fixed-bed reactor under elevated pressures were studied. The effects of variations in superficial velocity from 0.09 m/s to 0.26 m/s, operating pressure from 4 to 50 atm absolute, and the height of the fixed-bed from 11.7 cm to 24.5 cm on breakthrough curves and sulfur loading were investigated. In all the experiments, the H2S concentration profiles of the exiting gas from the reactor were measured until the bed was saturated. It was found that the shape of the breakthrough curves depend on the superficial velocity and the inlet H2S concentration in gas streams. Under both higher superficial velocity and higher inlet H2S concentration, the shape of the breakthrough curve becomes steeper. The sulfur loading of the adsorbent depends on the superficial velocity, the inlet H2S concentration in gas streams, and the bed height. The sulfur loading decreases as the superficial velocity and the inlet H2S concentration increase, but increases as the bed height increases. The change of operating pressure does not have a significant effect on the shape of the breakthrough curve or sulfur loading of the adsorbent. The investigation was also extended using the regenerated adsorbents. A mathematical formula was developed to describe the breakthrough curves.

Abstract Hydrogen sulfide (H2S) is an environmentally hazardous, corrosive, and toxic gas, mostly generated in gas and oil industry. For small-scale natural gas processing sites (less than 10 tonne S/day), the use of regenerable iron oxide adsorbent to adsorb H2S from natural gas is still an economical and effective method. The objective of this research project was to understand the performance of an iron oxide adsorbent, recently emerging in the Canadian market, in removing H2S from gas streams. To accomplish this, the breakthrough behaviors of H2S adsorption in a fixed-bed reactor under elevated pressures were studied. The effects of variations in superficial velocity from 0.09 m/s to 0.26 m/s, operating pressure from 4 to 50 atm absolute, and the height of the fixed-bed from 11.7 cm to 24.5 cm on breakthrough curves and sulfur loading were investigated. In all the experiments, the H2S concentration profiles of the exiting gas from the reactor were measured until the bed was saturated. It was found that the shape of the breakthrough curves depend on the superficial velocity and the inlet H2S concentration in gas streams. Under both higher superficial velocity and higher inlet H2S concentration, the shape of the breakthrough curve becomes steeper. The sulfur loading of the adsorbent depends on the superficial velocity, the inlet H2S concentration in gas streams, and the bed height. The sulfur loading decreases as the superficial velocity and the inlet H2S concentration increase, but increases as the bed height increases. The change of operating pressure does not have a significant effect on the shape of the breakthrough curve or sulfur loading of the adsorbent. The investigation was also extended using the regenerated adsorbents. A mathematical formula was developed to describe the breakthrough curves.

Magistro darbe aptariamos Šiaulių regiono ekonominio ir socialinio proveržio galimybės. Pirmoje magistro darbo dalyje nurodoma, kad Šiaulių apskrities ekonominio ir socialinio proveržio galimybės iš „Hinterlando“ (atokaus rajono) į „Worderlandą“ (išsivysčiusį regioną) turėtų būti sietinos su regiono plėtros proceso teoriniais aspektais, Šiaulių apskrities socialinių ir ekonominių rodiklių analizės, prognozavimo momentais, Europos Sąjungos projektais, skirtais bendruomeniškumui, kaimiškųjų vietovių plėtros pokyčiais, miesto savivaldybės investiciniais projektais. Antroje magistro darbo dalyje aptariama specialių ekonominių zonų Lietuvos Respublikoje, JAV ir kitose šalyse raida ir jų nauda regionui. Pabrėžiami Silicio slėnio JAV, Saulėtekio slėnio Lietuvoje ir steigiamų specialių ekonominių zonų Šiaulių apskrityje, Industrinio parko Šiaulių mieste privalumai regiono vystymosi kontekste. Trečioje magistro darbo dalyje aptariamos investicinio patrauklumo teorinės ir praktinės prielaidos. Šiaulių apskrities investicinis patrauklumas turėtų būti kuriamas identifikuojant apskrities ekonominius rodiklius (pav., BVP dalis lyginant su šalies vidurkiu Lietuvos apskrityse, tiesioginės užsienio investicijos Lietuvos apskrityse). Atlikta identifikuotų tam tikrų makroekonominių ir socialinių investicinio patrauklumo rodiklių bei Šiaulių apskrities darnaus vystymosi rodiklių analizė. Apskaičiuotos statistinės prognozės panaudojant trendo funkciją 2010 ir 2013 metams, apskaičiuoti... [toliau žr. visą tekstą] / In the Master’s thesis possibilities of the Šiauliai region economic and social breakthrough are discussed. In the first part of the Master’s thesis it is noted that possibilities of economic and social breakthrough from “Hinterland” (remote region) to “Worderland” (developed region) must be linked with the regional development process theoretical aspects, the Šiauliai county social and economic indices’ analysis, forecasting methods, the EU projects aimed at sociality, rural areas’ development changes, the city investment projects. In the second part of the Master’s thesis it is discussed developments of special economic zones in the Republic of Lithuania, the US and other countries, their benefits to the region. It is emphasized the advantages in the regional development context related to the Silicon Valley in the US, the Sunrise Valley in Lithuania and the currently created special economic zones in the Šiauliai county, the Industrial Park. In the third part of the Master’s thesis the theoretical and practical assumptions of the investment attraction have been discussed. The investment attraction of the Šiauliai county may be created identifying economic indices (e.g. the share of the GDP as compared to the average in the Lithuanian counties, direct foreign investment in the Lithuanian counties). The analysis of the identified particular macroeconomic and social investment attraction indices have been carried out. The statistical forecasts using the trend function... [to full text]

Membrane technology has become a predominant process in providing one of the key components of life (water), either through water and wastewater treatment for water quality purposes or desalination as seen in Ultra-filtration, Nano-filtration, Reverse osmosis, Membrane distillation, Pervaporation, among others. With the ever-increasing demand for portable water due to population increase, constant research has focused on the improvements of the performances of the different water treatment systems including enhancing the performance of the membrane. Among all the different membrane performance enhancement techniques exploited, incorporation of filler has gained much grounds in the last decades. Traditional fillers like silica gel, activated carbon, metal oxides and zeolites are now being challenged by the recent class of mesoporous materials known as Metal Organic Frameworks (MOFs), which are built of metal ions or metal ion clusters linked together by organic ligands giving these materials tunable pore geometries and pore volume, greatly improved surface area with extraordinary adsorptive properties. The membrane incorporating MOFs demonstrate enhance performances more than the other fillers due to the good coordination of the organic moiety and polymers. The overall objective of this project is to develop and study a membrane incorporated MOFs nanofiber system vis-à-vis their applications in heavy metal contaminated water treatment, stability in aqueous media and the advantages and drawbacks of these composite membranes with regards to the quality of the water produced. The developed materials were characterized by SEM, FTIR, TEM, XPS, DSC, and TGA. The heavy metals earmarked for this study include; Lead, Mercury, Cadmium, and Zinc and were studied using flame atomic absorption spectrometry (FAAS). Upon successful fabrication of the nanofiber membranes, detailed adsorption studies were conducted (pristine MOF, pristine nanofibers, enmeshed MOFs) to establish adsorption kinetics and isotherm, which were used further to select the best performing membranes for filtration application. Two different MOFs were used, MOF808; made of Zirconium and Benzene Tricarboxylate) and MOF F300; made of Iron and Benzene Tricarboxylate) The adsorption capacities of the MOFs for the different heavy metal analyzed were; MOF 808 (Pb-170.74 mg g-1, Zn-287 mg g-1, Cd-225.05 mg g-1, Hg-276.96 mg g-1) and MOF F300 (Pb-148.13 mg g-1, Hg-229.66 mg g-1), while the membrane adsorption capacities were; PA808 (MOF 808 embedded within polyacrylonitrile (PA) nanofibers, (Pb-23.98 mg g-1, Hg-50.88 mg g-1), PA300, MOF F300 embedded within polyacrylonitrile nanofibers, (Pb-30.19 mg g-1, Hg-53.09 mg g-1). Upon activation of MOF 808 by water (hydractivation), the removal efficiency of MOF 808 was improved by 10% while the MOF membrane efficiency was increased by 30%. Filtration experiments could produce 577.5 L of treated water with a single layer of PAN/ MOF808 membrane at 0.1 bar using a 50 ppb Pb ion feed solution.

Na região de Ribeirão Preto está localizado um dos pólos produtores de cana-de-açúcar uma das principais culturas da economia brasileira, com vasta área cultivada e uso intensivo de herbicidas, dos quais é preciso destacar o diuron e a hexazinona, pois ambos possuem elevado potencial de contaminação em águas superficiais e subterrâneas. Diversas tecnologias podem ser utilizadas para remover da água esses microcontaminantes, pelo fato de, neste caso, não ser eficiente a técnica de tratamento em ciclo completo &#40;ou convencional&#41;. Neste trabalho de pesquisa foram investigadas as combinações de preoxidação com cloro e dióxido de cloro, de adsorção em carvão ativado pulverizado e granular, associadas ao tratamento em ciclo completo. A água de estudo foi preparada em laboratório, com características similares às do rio Pardo &#8211; futuro manancial para abastecimento da cidade de Ribeirão Preto, e fortificada com diuron e hexazinona. Ensaios de bancada feitos em jarteste e filtros de laboratório permitiram concluir que a adsorção em carvão ativado &#40;pulverizado e granular&#41; foi eficiente na remoção dos herbicidas. Foi construída e operada uma instalação piloto com colunas de adsorção, em carvão ativado granular, cujos resultados obtidos mostraram que a difusividade intrapartícula predominante entre o carvão e os herbicidas diuron e hexazinona pode ser considerada constante, em relação ao tamanho do grão de carvão ativado. Os resultados também possibilitaram a validação do método de ensaios rápidos em coluna de carvão ativado em escala reduzida, com vista à predição do tempo de ruptura de um filtro de carvão ativado granular em escala real. Para as condições ensaiadas, a adsorção em carvão ativado granular mostrou ser 12&#37; mais eficiente que em carvão ativado pulverizado, cujas taxas de utilização foram de 10,7 e 12,0 miligrama de carvão por litro de água tratada, respectivamente. Foram dimensionados os sistemas para utilizar carvão ativado pulverizado e granular em uma ETA de 1 m3&#47;s e contabilizados os custos de implantação e de operação. Embora os custos de implantação do sistema de carvão ativado granular tenham resultado da ordem de 3 vezes os do pulverizado, os custos totais em valor presente seriam igualados em 5 anos, podem ser até 23&#37; menores em 20 anos &#8211; o que mostra a viabilidade técnico-financeira desta alternativa no tratamento de águas contaminadas com herbicidas. / Sugarcane is one of the major crops of the Brazilian economy and the city of Ribeirao Preto is in one of the largest sugarcane producing regions, with a vast sugarcane plantation area and intensive use of herbicides, especially diuron and hexazinone, which have high potential to contaminate surface waters and groundwater. Several different technologies can be used to remove these micro-contaminants from water since, in this case, conventional treatment is not an efficient technique. In the present study, the combinations of pre-oxidation with chlorine and chlorine dioxide and adsorption in powdered and granular activated carbon associated with the conventional treatment were investigated. The water sample investigated in this study was prepared in a laboratory with similar characteristics to that of the Pardo river - future source of water supply for the city of Ribeirao Preto - and supplemented with diuron and hexazinone. Bench-scale experiments performed using Jartest equipment and laboratory filters showed that the adsorption in activated carbon &#40;powdered and granular&#41; was effective in removing the herbicides. A pilot granular activated carbon column was built and operated, and the results showed that the prevailing intraparticle diffusivity between the carbon and the herbicides diuron and hexazinone can be considered constant, do not change with particle size. The results obtained also enabled the validation of the rapid small-scale column test &#40;RSSCT&#41; method to predict the full scale breakthrough time of a granular activated carbon filter. Under the conditions evaluated, the adsorption in granular activated carbon proved to be 12&#37; more efficient than that in powdered activated carbon, whose carbon usage rates were 10.7 and 12.0 milligrams per liter of treated water, respectively. The systems were designed to use powdered and granular activated carbon in a 1 m3&#47;s conventional water treatment plant, and the implementation and operation costs were calculated. Although the capital costs of the granular activated carbon system were about 3 times higher than those of the powdered activated carbon, these costs would be the same in 5 years and could even be 22&#37; lower in 20 years, which shows the technical-financial feasibility of this alternative to the treatment of water contaminated with herbicides.