Made available in DSpace on 2016-06-02T19:56:51Z (GMT). No. of bitstreams: 1 5139.pdf: 12746336 bytes, checksum: 29fb732e5229386de121842edce9b72b (MD5) Previous issue date: 2013-04-11 / Universidade Federal de Sao Carlos / The presence of particles after the reverse air pulse cleaning process inside the filter medium ensures the increase in pressure drop of the subsequent cycle. The performance of the filter medium after several filtration cycles and cleaning cycles with reverse air pulse is not clearly known. For this purpose, the main objective of this work was to investigate the performance of the filter medium with reverse air pulse cleaning through the study of cleaning efficiency and by observing the regeneration of filter media. The satisfactory performance of the experimental unit was observed in the preliminary trials during filtration and cleaning by reverse air pulse having polypropylene and acrylic as filter media and phosphate concentrate as particulate matter. It was found that the increase in the number of filtration and cleaning cycles had an influence on the behavior of the filter media, when the filtration velocity was kept at 4 cm/s, the pressure drop at 200 Pa and with pulse time of 200 ms. It was observed that, even with the heterogeneity of filter media, particles were trapped on the surface of the fabric and the number of particles retained increased with the increase in the number of cycles. When comparing the filter media submitted to two hundred filtration and cleaning cycles, it was found that the polypropylene filter presented greater permeability, greater specific resistance and cake porosity, greater amount of mass retained after cleaning and greater cleaning efficiency than the acrylic filter using the same operational parameters. However, the performance was satisfactory for both filter media which, despite their differences, showed to be adequate for the operations of filtration and reverse air pulse cleaning. / A presença de partículas após a limpeza por pulso de ar reverso no interior do meio filtrante garante o aumento da queda de pressão do ciclo subsequente. O desempenho do meio filtrante após vários ciclos de filtração e limpeza por pulso de ar reverso, não é claramente conhecido. Para tal finalidade, teve-se como objetivo principal a investigação do desempenho do meio filtrante com limpeza por pulso de ar reverso, através do estudo da eficiência de limpeza e da observação da regeneração dos meios filtrantes. A satisfatória performance da unidade experimental foi observada nos ensaios preliminares durante a filtração e limpeza por pulso de ar reverso, utilizando como meio filtrante o polipropileno e o acrílico, e como material particulado o concentrado fosfático. Verificou-se a influência do acréscimo do número de ciclos de filtração e limpeza no comportamento dos meios filtrantes, mantendo-se a velocidade de filtração de 4 cm/s, a queda de pressão de 200 Pa e o tempo de pulso de 200 ms. Observou-se, mesmo com a heterogeneidade dos meios filtrantes, que houveram partículas retidas na superfície do tecido, que aumentaram com o acréscimo do número de ciclos. Constatou-se, ao comparar os meios filtrantes submetidos a duzentos ciclos de filtração e limpeza, que o filtro de polipropileno apresentou maior permeação, maior resistência específica e porosidade da torta, maior quantidade de massa retida após a limpeza e maior eficiência de limpeza, comparada ao filtro de acrílico utilizando os mesmos parâmetros operacionais. No entanto, o desempenho foi satisfatório para ambos os meios filtrantes, que apesar de suas diferenciações, mostraram-se adequados em operações de filtração e limpeza por pulso de ar reverso.

Didžiausiais paviršinių nuotekų teršalais laikomi naftos produktai ir skendinčiosios medžiagos. Pastarąsias galima nesunkiai pašalinti taikant tradicinius paviršinių nuotekų valymo metodus, tokius kaip nusodinimas, o naftos produktų šalinimui reikalingas antrinis nuotekų valymas. Vienas efektyviausių NP šalinimo iš nuotekų būdas yra filtravimas pro sorbuojančiosios medžiagos filtrą. Nors šiuo būdu valant nuotekas galima pasiekti didelio teršalų šalinimo efektyvumo, praktiškai dažnai susiduriama su problema, kai į eksploatuojamuosius valymo įrenginius nuotekos atiteka dideliais greičiais ir teršalai nėra iki galo pašalinami. Todėl šiame darbe buvo atliktas trijų skirtingų sintetinių sorbentų („Fibroil, „Duck“, „Reo-dry“) efektyvumo šalinti iš paviršinių nuotekų naftos produktus ekstremaliomis sąlygomis (esant dideliems greičiams) eksperimentinis tyrimas. Atlikus bandymus su dirbtinėmis ir realiomis paviršinėmis nuotekomis laboratoriniame stende, nustatyta, kad visų trijų sorbentų efektyvumas šalinti NP yra panašus ir skendinčiosios medžiagos bei nuotekų drumstumas neturi įtakos NP šalinimo efektyvumui. Tačiau „Fibroil“ sorbentą naudojant kaip filtro užpildą, 30 m/h greitį galima išlaikyti gerokai ilgiau nei su sorbentais „Duck“ ir „Reo-dry“ ir šį sorbentą naudoti ekonomiškiausia. Darbą sudaro 8 dalys: įvadas, darbo aktualumo aprašymas, literatūros apžvalga, tiriamojo darbo metodikos aprašymas, eksperimeto rezultatai, rekomendacijos ir išvados bei literatūros sąrašas. Darbo... [toliau žr. visą tekstą] / Suspended solids and oil products are considered as the most important pollutants in the storm water. As suspended solids can be easily retained from storm water by simple sedimentation, for oil products it is usually needed to have a secondary treatment: filtration through sorbents media. Although storm water filtration through a sorbent filter gives high treatment efficiency, it is usually impossible to ensure the right speed of storm water coming to the treatment facilities (it is usually too high to ensure an efficient sorption). For this reason the research and analysis of three different synthetic sorbents („Fibroil“, „Duck“, „Reo-dry“) were performed with artificial and real storm water in the laboratory under extreme conditions (filtration speed 30 m/h). According to the results of the experiment, all three sorbents have similar treatment efficiency and suspended solids and turbidity has no impact on oil products removal efficiency. But it is more efficient to use “Fibroil” and it is suitable for filtration under 30 m/h speed much longer than sorbents “Duck” and “Reo-dry”. Structure: introduction, relevance, methodology, results of the experiment, recomedations conclusions and references. Thesis consist of: 55 p. text without appendixes, 21 pictures, 8 tables, 39 bibliographical entries.

Eutrophication due to excess loading of phosphorus (P) is a leading cause of water quality degradation within the United States. The aim of this study was to investigate P removal and recovery with 12 materials (four calcite varieties, wollastonite, dolomite, hydroxylapatite, eggshells, coral sands, biochar, and activated carbon. This was accomplished through a series of batch experiments with synthetic wastewater solutions ranging from 10-100 mg PO₄-P/ L. The results of this study were used to establish large-scale, calcite-based column filter experiments located in the Rubenstein School of Environment and Natural Resources' Eco-Machine. Influent and effluent wastewater samples were routinely collected for 64 days. Measures of filter performance included changes in pH, percent reduction and mass adsorbed of P. After the columns reached saturation, filter media was analyzed for the mineralogical content by X-ray powder diffraction (XRD). In the batch experiments, P removal and recovery varied among the media and across treatments. The best performing minerals were calcite, wollastonite, and hydroxylapatite. Eggshells, activated carbon, and coral sands also reduced and adsorbed P. The remaining materials had the lowest reductions and adsorption of P. Results from batch experiments informed the design of large column filters within the Rubenstein School of the Environment and Natural Resources' Eco-Machine. Removal and adsorption rates of P by the three column filters were similar. The columns achieved an average P reduction of 12.53% (se = 0.98) and an average P adsorption of 0.649 mg PO₄-P/ kg media (se = 0.03) over a 4-h hydraulic retention time. Paired T-tests showed that P reductions were statistically significant (p-value < 0.05) on the majority of sampling dates until the columns reached saturation. Saturation was reached after 31 days for two of the columns and 36 days for the third column. The filter media consistently buffered the pH of the wastewater to approximately 6.0-7.0 with no indication of diminishing buffer capacity after saturation. XRD analysis was not able to detect any P species within the crystalline structure of the filter media. This research contributes to the understanding of how the selected media perform during P removal and recovery programs, while providing information on the performance of large column filters operating within advanced, ecologically engineered wastewater treatment systems.

Vertical flow constructed wetlands (VF CWs) are becoming increasingly popular for onsite wastewater treatment due to their high oxygen transfer capacity and high nitrification rates. However, there are still some question marks regarding (1) how the treatment performance of VF CWs is affected by design and operational parameters, and (2) the treatment processes happening inside the wetland bed as the wastewater percolates through. In this study, we investigated the effects of filter media (coarse sand or fine gravel), dosing regime (hourly with 4 mm or bi-hourly with 8 mm) and plant presence (with or without Phragmites australis) on the  treatment performance and concentration depth profiles of pollutant removal in six pilot-scale VF CWs treating primary treated domestic wastewater. Grab samples of wastewater were collected every 2-3 weeks during 5 months and analyzed for organic matter, suspended solids, nitrogen and E. coli. We found that sand beds performed better than gravel beds for removal of all pollutants except total nitrogen, although for long term operation gravel may be less susceptible to clogging. The overall treatment performance was not affected by different dosing regimes, but the concentration depth profiles showed that smaller and more frequent doses led to more pollutant removal in the upper part of the beds. The presence of plants was moderately important for the removal of ammonium, but had no effect on other pollutants.

L'assainissement a de tout temps été une préoccupation majeure pour des questions d'hygiène et de santé publique. Une installation d'assainissement non collectif (ANC) assure la collecte, le transport, le traitement et l'évacuation des eaux usées domestiques. En France, l’ANC représente 20 % des installations de traitement des eaux usées domestiques. Cela concerne une population de 12 millions d'habitants, soit environ cinq millions d'installations en zones rurales. Parmi les technologies utilisées dans l’ANC, les systèmes de filtration biologique utilisant un milieu filtrant sont souvent mis en oeuvre. Le traitement des eaux usées (élimination des matières en suspension et de la matière organique) est effectué par les actions conjointes de filtration, et de biodégradation par des bactéries se développant au sein du milieu filtrant. Historiquement, des matériaux comme le sable et la tourbe sont les plus utilisés, et plus récemment des milieux à base de copeaux de coco venus remplacer la tourbe dont l’extraction est interdite, sont en développement croissant. Cependant, l’empreinte carbone produite par l'importation depuis l'étranger de matériaux tels que ce dernier est très importante. Dès lors l’utilisation de sousproduits agro-industriels locaux pourrait la diminuer et rendre l’utilisation de ces nouveaux milieux filtrants plus compatible avec des critères environnementaux. Le premier objectif de cette thèse est de déterminer le degré de fiabilité en conditions réelles d’un milieu filtrant innovant d’origine végétale ayant fait ses preuves en conditions de laboratoire. L’étude est basée sur la mise en parallèle de résultats obtenus en laboratoire et sur le terrain. Au laboratoire, une approche hydraulique a permis de caractériser le fonctionnement du lit filtrant. Sur le terrain, l’évaluation d’un filtre compact qui fonctionne de façon continue depuis plus de quatre ans et de cinq autres installations a été réalisée. Pour l’ensemble des installations, le milieu filtrant testé permet d’obtenir une qualité des eaux rejetées en accord avec la règlementation en vigueur. Les pourcentages moyens de réduction estimés de la DCO, de la DBO5 et des MES sont respectivement de plus de 79 %, 98 % et 88 %, confirmant ainsi la forte dégradation de la matière carbonée et de la pollution particulaire. Le second objectif de cette thèse consiste à établir un jeu de paramètres physicochimiques permettant de guider le choix de nouveaux matériaux potentiellement utilisables en ANC. Pour ce faire, la caractérisation des paramètres physicochimiques clés de nouveaux matériaux et des paramètres hydrauliques des lits filtrants correspondants a été effectuée. Une analyse statistique a permis d’étudier les corrélations entre ces paramètres et les performances épuratoires des matériaux. Au final, une méthodologie de sélection a été proposée. / Sanitation has always been a major concern for hygiene and public health issues. An on-site sewage facility (OSSF) ensures the collection, transportation, treatment and disposal of domestic wastewater. In France, the OSSF represents 20% of domestic wastewater treatment facilities. This represents a population of 12 million or about five million rural settlements. Among the technologies used in the OSSF, biological filtration systems using a filter media are often implemented. The treatment of wastewater (removal of suspended solids and organic matter) is carried out by the joint actions of filtration, and biodegradation by bacteria developing within the filter media. Historically, materials such as sand and peat are the most used. More recently coconut-based media to replace peat, the extraction of which is prohibited, are in increasing development. However, the carbon footprint of foreign imports of materials such as coconut is very important. Therefore, the use of local agro-industrial by-products could reduce the carbon footprint and make the use of these new filter media more compatible with environmental criteria. The first objective of this PhD thesis is to determine the degree of reliability under real conditions of an innovative filtering medium of lignocellulosic origin that has been proven successful in laboratory conditions. The study is based on the comparison of results obtained in the laboratory and in the field. In the laboratory, a hydraulic approach allowed the characterisation of the filter bed operation. In the field, the evaluation of a compact filter that has been running continuously for more than four years and five other installations has been completed. For all installations, the filter media tested allowed a quality of the discharged water in accordance with the current regulations. The estimated average reduction percentages of COD, BOD5 and TSS, are respectively over 79%, 98% and 88%, thus confirming the important degradation of the organic matter and particulate pollution. The second objective of this PhD thesis is to establish a set of physicochemical parameters to guide the choice of new materials potentially usable in OSSF. To do this, the characterisation of the key physicochemical parameters of new materials and the hydraulic parameters of the corresponding filter beds were carried out. Statistical analysis made it possible to study the correlations between these parameters and the purification performances of the materials. In the end, a selection methodology has been proposed.

No description available.

The increasing highway traffic is leading to higher and higher levels of pollutants in the stormwater, such as suspended solids, metals, oils, nutrients and PAH. This runoff water causes the degradation of water bodies quality, leading to increased interest in the treatment of highway runoff for the removal of contaminants. Traditional treatments mostly consist of sedimentation, aimed primarily at the removal of suspended solids and particlebound contaminants. Recently the concern has shifted to the dissolved and colloidal fractions of contaminants as well, metals in particular, which makes reactive media filters a potentially interesting technology for runoff water treatment. However, very little research has been carried out on this technology so far, mostly in batch laboratory experiments with synthetic runoff water. This study aims at investigating the performance of four reactive media filters (Petrit T, Polonite, D-Rainclean and Filtralite-P) and a defined filter sand used for water processing at removing dissolved and particulate-bound metals. To achieve the goal, a pilot plant has been constructed in Gröndal, south of Stockholm, inside the existing Gröndalsmagasin, a full-scale stormwater treatment plant. The catchment area is located mostly on the E4 and Essingeleden, the highest trafficked motorway in Sweden with an AADT of 140 000 vehicles. A pump feeds the pilot plant from the Gröndalsmagasin outlet, after the stormwater has been treated with flocculation and sedimentation, and collects such water in a collection vessel. The five filter media columns are fed during runoff events with a flow scaled proportionally to the influent in the Gröndalsmagasin to mimic real conditions of flow and pollutant concentrations. Field measurements of pH, turbidity and conductivity, have been carried out during the trial. Samples have also been collected with flow proportional samplers connected to the collection vessel and the outlet of the five columns, as well as in the form of grab samples from sample ports at different depths in the columns. These samples have been sent to ALS Scandinavia AB to perform lab analysis. The pH in the effluent of the reactive filter media increased to values between 10 and 13, and slowly decreased during the trial. No difference was found between the pH in Filtersand outlet and the influent water. All materials showed excellent performance at removal of dissolved and particulate-bound Zn as well as particulate-bound Cu. Dissolved Cu was removed effectively by reactive media, and to a minor extent by Filtersand. Leaching of metals was observed from three materials: Filtersand released Mn during April, Polonite released Cr, with a very good correlation with the Chloride content and Petrit-T released Ba during the entire trials. / Den ökande vägtrafiken leder till allt högre halter av föroreningar i dagvattnet, till exampel suspenderade ämnen, metaller, oljor, närings ämnen och PAH. Detta dagvatten försämrar degradering av vattenförekomsternas kvalitet, vilket har lett till ett ökat intresse för rening av dagvatten fr ̊ån motorvägar för att avlägsna föroreningar. Traditionella behandlingar består oftast av sedimentering, som främst syftar till att reducera suspenderade ämnen och partikelbundna föroreningar. På senaste tiden har intresset förskjutits till att även omfatta lösta och kolloidala fraktioner av föroreningar, speciellt metaller, vilket gör reaktiva filtermaterial till en potentiellt intressant teknik f ̈or behandling av dagvatten. Mycket lite forskning har dock gjorts om denna teknik hittills, då oftast i laboratorieexperiment med syntetiskt dagvatten. Denna studie syftar till att undersöka hur fyra reaktiva mediafilter (Petrit T, Polonite, D-Rainclean och Filtralite-P) och en typ av sandfilter fungerar när det gäller att avlägsna lösta och partikelbundna metaller. F ̈or att uppnå målet har en pilotanläggning byggts i Gröndal, söder om Stockholm, inuti det existerande Gröndalsmagasinet, ett dagvattenreningsverk i full skala. Avrinningsområdet ligger vid E4 och Essingeleden, den mest trafikerade motorvägen i Sverige med en ÅDT på 140 000 fordon. En pump matar pilotanläggningen fr ̊ån Gröndalsmagasinets utlopp, efter att dagvattnet har behandlats med flockning och sedimentering, och samlas upp detta vatten i ett uppsamlingskärl. De fem filtreringskolonnerna matas under avrinningshändelserna med ett flöde som är proportionellt till inflödet till Gröndalsmagasinet för att imitera verkliga förhållanden av flöde och föroreningskoncentrationer. Mätningar av pH, turbiditet och konduktivitet har utförts under försöket. Prover har också samlats in med flödesproportionella provtagare som är kopplade till uppsamlingskärlet och utloppet fr ̊an de fem kolonnerna, samt i form av grabbprover fr ̊an provtagningsöppningar på olika djup i kolonnerna. Dessa prover har skickats till ALS Scandinavia AB för laboratorieanalys. pH-värdet i utflödet fr ̊ån det reaktiva filtermediet ökade till värden mellan 10 och 13 och sjönk långsamt under försöket. Ingen skillnad hittades mellan pH-värdet i filtrets utlopp och inflödesvattnet. Alla material visade mycket goda resultat när det gäller avlägsnande av löst och partikulät bundet Zn samt partikulärt bundet Cu. Lösta Cu avlägsnades mycket effektivt av reaktiva medier och i mindre utsträckning av Filtersand. Läckage av metaller observerades fr ̊ån tre material: Filtersand släppte ut Mn under April, Polonite släppte ut Cr, med en mycket god korrelation med kloridhalten och Petrit-T släppte ut Ba under hela försöket.