Thesis (Ph. D.)--University of Missouri-Columbia, 1998. / Typescript. Vita. Includes bibliographical references (leaves 151-161). Also available on the Internet.

Thesis (M.S.)--Bowling Green State University, 2009. / Document formatted into pages; contains xiii, 114 p. : ill., maps. Includes bibliographical references.

Thesis (Ph. D.)--University of Missouri-Columbia, 1998. / Typescript. Vita. Includes bibliographical references (leaves 151-161). Also available on the Internet.

Conhecer e estudar as propriedades do concreto e seus compósitos cimentícios, com e sem a incorporação de resíduos, é uma forma de propor melhorias na construção civil e contribuir com o desenvolvimento sustentável. Este trabalho propõe investigar o efeito da incorporação de um resíduo, como o lodo proveniente do tratamento de efluentes da indústria metal-mecânica, na piezoresistividade e no comportamento elétrico de um compósito cimentício. O lodo é um resíduo da indústria metal mecânica proveniente do tratamento de efluentes do processo de revestimento do aço. A piezoresistividade é uma propriedade elétrica que descreve a variação de resistência elétrica de alguns materiais quando submetidos a esforços e deformações mecânicas. Para esse estudo foram confeccionados corpos de prova cúbicos com uma mistura de cimento, areia e água onde foram adicionados diferentes percentuais de resíduo a ser comparado com a amostra de referência. O ensaio de piezoresistividade consistiu na aplicação de cargas de compressão que variaram de 0 a 2,1 kN e simultaneamente foram registradas as variações da resistência elétrica de cada amostra. A pesquisa tem caráter exploratório, portanto os ensaios realizados não tiveram temperatura e umidade controladas. As amostras com resíduo demonstraram maior potencial energético e maior piezoresistividade. O corpo de prova de referência apresentou valores de resistividade menor do que as amostras contendo lodo, na ordem de 5x106 Ω.cm e permanece praticamente constante quanto maior a pressão aplicada, ocorreu uma redução de apenas 1,73% na resistividade elétrica. Por outro lado, as amostras contendo lodo incorporado apresentam inicialmente resistividade entre 0,9 x 107 a 2,7 x 107 Ω.cm tendendo a diminuir drasticamente, 27 a 55% com a pressão aplicada, principalmente nas amostras contendo acima de 15 % de lodo. Dentre as amostras analisadas, a que possui 5% de resíduo, apresentou potencial elétrico na faixa de 2,48 x 10-2 W/cm² a 5,85 x 10-2 W/cm² nas aplicação de cargas de 90 a 1600 kPa. Logo, uma elevação de 135 %. Portanto, essa amostra foi a que demonstrou ser a mais ideal para a conversão energética por apresentar melhor resposta elétrica aliado à sua resistência mecânica. / Analysis of the piezoresistive behavior of concrete containing residual sludge from wastewater treatment of metal-mechanical industry abstract knowing and studying the properties of concrete with and without the incorporation of waste is one way to propose improvements in construction and contribute to sustainable development. This paper proposes to investigate the effect of incorporation of waste, as the sludge from wastewater treatment of the metal-mechanics industry, on piezoresistividade in a cementitious composite. The waste is a residual metal mechanics industry from the wastewater treatment of the coating process of steel. The piezoresistividade is an electrical property that describes the variation of electrical resistance of some materials when subjected to forces and mechanical deformations. For this study were prepared specimens cubic with a mixture of cement, sand and water were added different percentages of residue to be compared with the reference sample. The piezoresistividade test consisted in the application of compression charges that ranged from 0 to 2.1 kN and simultaneously we recorded the changes in electrical resistance of each sample. The research is exploratory character, so the tests did not have temperature and humidity controlled. The samples showed greater energy potential residue with and greater piezoresistividade. The body of evidence introduced reference values of resistivity less than the samples containing mud, in the order of 5x106 Ω.cm remains practically constant and the higher the applied pressure, a reduction of only 1.73% on electrical resistivity. On the other hand, samples containing embedded sludge present initially between resistivity 0.9 x 2.7 x 107 to 107 Ω.cm tending to decrease dramatically, 27 to 55% with the pressure applied, especially in samples containing up to 15%. One of the samples analysed that has 5% of waste was the one that proved to be the most ideal for energy conversion, due to your electrical response in the tests your ally mechanical resistance.

L’origine de ce travail est principalement les effets biologiques potentiels des ondes électromagnétiques de la gamme non ionisante rencontrés dans la littérature et quelques faits observés par des clients de la technologie commercialisée par la société Planet Horizon SA. Les essais de couplage du traitement aux ondes électromagnétiques et les procédés de traitements des eaux usées par boues actives sont réalisés à niveau industriel au sein de la STEP de Penthaz (Suisse) compose de 2 lignes parallèles et sur des pilotes de laboratoire en mode SBR. Le traitement électromagnétique de très basse fréquence (Antennes émettant deux fréquences harmoniques F1 et F2 < 10 kHz) est appliqué via 5 antennes dans le bassin d’aération ou une antenne sans le SBR directement. Dans une autre expérience , des tubes, émettant les mêmes fréquences, sont utilisés pour le recyclage de la liqueur mixte avec toujours une ligne de référence. Au niveau de la STEP, dans le bassin d’aération le traitement électromagnétique a permis une réduction de la quantité de biomasse produite au niveau de l’essai de l’ordre de 42,5% par rapport à ligne témoin. De plus, ce traitement électromagnétique n’affecte pas la qualité de l’eau épurée puisque la quantité de DCO résiduelle est la même à la sortie des deux ligne (REF et EM) et le rendement d’abattement de la matière organique est de l’ordre de 94% pour les deux lignes. Par contre à l’échelle du laboratoire, les résultats obtenus après le couplage du traitement électromagnétique n’ont aucun effet sur la quantité de biomasse produite dans les différents essais avec antenne ou bobine comme étant des émetteurs d’ondes EM. De même, on ne remarque aucun effet significatif sur les rendements de dépollution. La deuxième partie concerne l’application de ces mêmes ondes sur la formation de biofilm microbien. Les champs électromagnétiques visés sont des faibles champs de quelques dizaines de milli-teslas au niveau du générateur (tension de l’ordre de la dizaine de volts et intensité de l’ordre d’un ampère) avec des fréquences comprises entre 0 et 10 kHz; deux ondes de fréquences harmoniques sont imposées simultanément. Le biofilm est quantifié au cours du temps grâce à la mesure de différents paramètres (densité optique, DCO, protéines, ATP, exopolysaccharides). Les résultats expérimentaux démontrent que l’onde électromagnétique limite la formation du biofilm si la continuité hydraulique est assurée entre la bobine électromagnétique et les supports de biofilm ; la quantité de biofilm mesurée est alors deux fois plus faible environ. Cependant, l’effet semble bactériostatique et non bactéricide : l’application de l’onde ne détruit pas le biofilm mais réduit sa formation car dès l’arrêt de l’onde, la vitesse augmente. Des signaux électriques de quelques millivolts et dans le domaine des très basses fréquences ont été détectés seulement dans la cuve en continuité hydraulique avec le générateur d’ondes et située à une distance de 1m environ. Des mesures de champs électromagnétiques dans l’air donnent des intensités de champs très faibles ne pouvant expliquer un effet thermique ou ionisant sur le biofilm. / The first part of this work concerns the coupling of VLF electromagnetic waves treatment and the processes of wastewater treatment by activated sludge in order to reduce excess sludge. Experiments are made at real -scale ( Penthaz , Switzerland),containing two parallel lines and at lab-scale with SBR pilots. The electromagnetic treatment of very low frequency ( antennaemitting harmonic frequencies F1 and F2 <10 kHz) is applied via 5 (2,3x1m) antennas in the aeration basin of the real plant. Other type of antenna (30x 5 cm) was configurated for one of the labscale assays. In the other lab-scale experiment, tubes emitting the same frequency are used for recycling the mixed liquor. With the WWTP, the amount of excess sludge produced in the treated line is reduced by about 42.5%, compared to the control line. In addition, the electromagnetic treatment does not affect the quality of treated water. In this case, outlet COD concentration was similar for the the two lines (REF and EM) and the reduction of or ganic matter yield was about 94% for the two lines. Electromagnetic treatment had no effect on the amount of excess biomass produced in all tests conducted at lab-scale. No significant effect has been noticed regarding depollution yields. The second part aims to better understand the interaction between an electromagnetic wave of very low frequency and biological material and, in particular, the effects on the development of microbial biofilms. Electromagnetic fields are covered weak fields a few milli-Tesla (voltage of the order of tens of volts and intensity of the order of one ampere) with frequencies between 0 and 10 kHz, two waves of harmonic frequencies are transmitted simultaneously. The biofilm was quantified over time by measuring different parameters (optical density, COD, protein, ATP, exopolysaccharides). The experimental results how that the electromagnetic wave limit biofilm formation ( close to 50% of untreated biofilm) if the hydraulic continuity is ensured between the electromagnetic coil. However, the effect appears bacteriostatic and no antibacterial : the application of the wave does not destroy the biofilm but reduced its establishment and upon discontinuation of the wave, the growth increases. Measurements and modeling of electromagnetic fields in the air give intensities of very weak fields that can explain a thermal or ionizing effect on the biofilm.

Submitted by Raniere Barreto (raniere.barros@ufvjm.edu.br) on 2018-05-14T18:29:57Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) bruna_avelar_oliveira.pdf: 2185430 bytes, checksum: cc196667efb3556fb7981d98e97ff23c (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2018-05-15T18:46:58Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) bruna_avelar_oliveira.pdf: 2185430 bytes, checksum: cc196667efb3556fb7981d98e97ff23c (MD5) / Made available in DSpace on 2018-05-15T18:46:58Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) bruna_avelar_oliveira.pdf: 2185430 bytes, checksum: cc196667efb3556fb7981d98e97ff23c (MD5) Previous issue date: 2017 / Um dos principais fatores que favorece o desenvolvimento vegetal ? a caracter?stica dos substratos utilizados para a produ??o das mudas, considerando que o desenvolvimento produtivo das plantas est? intimamente ligado ? sua fase de desenvolvimento inicial. Considerando tais aspectos, este trabalho teve como objetivo avaliar o desenvolvimento fitot?cnico de plantas frut?feras e oler?colas, utilizando substratos desenvolvidos de res?duos de fibrilose oriundo de uma f?brica de papel e lodo de esgoto da Esta??o de tratamento de esgoto de Te?filo Otoni - MG. O res?duo de fibrilose foi coletado no p?tio de deposi??o de res?duo da f?brica de papel Santher, localizada em Governador Valadares - MG. O material coletado foi conduzido ao laborat?rio de ?gua e solos da Universidade Federal dos Vales do Jequitinhonha e Mucuri, localizado em Te?filo Otoni - MG. O material foi peneirado em peneira de malha de 5 mm para uniformiza??o de suas part?culas e mantido sob secagem ambiente durante uma semana. O lodo de esgoto tratado foi obtido da ETE de Te?filo Otoni, coletado no leito de secagem e conduzido ao laborat?rio sendo autoclavado e peneirado em peneiras de malha 5 mm para padroniza??o de suas part?culas. Em seguida, foi promovida a mistura do res?duo de fibrilose com o lodo de esgoto nas propor??es: T1 (4,5:5,5), T2 (5,5:4,5), T3 (6,5:3,5), T4 (7,5:2,5) e T5 (8,5:1,5) (fibrilose: lodo de esgoto) (Vol: Vol) em litros. Os materiais foram homogeneizados e mantidos em caixas de isopor durante 35 dias, visando ? estabiliza??o do composto. Os outros tratamentos utilizados foram: solo org?nico, composto org?nico Fertiliza ? e substrato Bioplant ?. Ap?s essa etapa foram utilizadas placas de isopor com c?lulas para produ??o de mudas. Ap?s o preenchimento das c?lulas foram semeadas sementes de Mam?o (Carica papaya), Maracuj? (Passiflora sp.), Berinjela (Solanum melongena), Piment?o (Capscium annuum) e Tomate (Licopersicum sp.). Foram utilizadas 36 c?lulas por parcela experimental e o experimento com cinco repeti??es. O delineamento experimental utilizado foi o inteiramente casualisado. Ap?s a germina??o foi avaliado o ?ndice de sobreviv?ncia das pl?ntulas. Em seguida, realizado um desbaste mantendo-se uma pl?ntula por c?lula durante 30 dias. Ap?s este per?odo as plantas foram coletadas e avaliados as seguintes vari?veis: comprimento por parte a?rea, comprimento da raiz, peso seco da raiz e parte a?rea. A an?lise estat?stica foi realizada utilizando o programa Estatjab da Unesp. As an?lises qu?micas dos substratos foram realizadas de acordo com o boletim de recomenda??o 3051 USEPA. Os resultados apontaram maior ?ndice de sobreviv?ncia do maracuj?, comparada com as demais esp?cies testadas e as an?lises qu?micas apontaram que os substratos produzidos de lodo de esgoto e fibrilose estavam de acordo aos padr?es da CONAMA 375/2006 e em concord?ncia com o MAPA, que disp?e sobre normas para o uso de substratos na agricultura. A eleva??o dos n?veis de mangan?s e pot?ssio provavelmente potencializaram a morte das pl?ntulas de berinjela e maracuj?, respectivamente. Em rela??o ao desenvolvimento das pl?ntulas, verificou-se que o composto fibrilose/ lodo de esgoto, nas propor??es T3 e T4 (fibrilose/ lodo de esgoto) apresentou resultados positivos e em muitos casos superiores quando comparado ao substrato comercial e demais materiais org?nicos. / Disserta??o (Mestrado Profissional) ? Programa de P?s-Gradua??o em Tecnologia, Sa?de e Sociedade, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2017. / Brazilian agribusiness and family agriculture have a great potential for development considering the country's soil and climate conditions. One of the main factors favoring plant development is the characteristic of the substrates used for the production of seedlings, considering that the productive development of the plants is closely linked to its initial development phase. Considering these aspects, the objective of this work was to evalue the phytotechnical development of fruit and vegetable plants, using substrates developed from fibrilose residues from the paper and sewage sludge plant of the Te?filo Otoni MG sewage treatment plant. The fibrilose residue was collected in the waste disposal yard of the Santher paper mill, located in Governador Valadares - MG. The collected material was taken to the water and soil laboratory of the Federal University of the Jequitinhonha and Mucuri Valleys, located in Te?filo Otoni, MG. The material was sieved in a 0.5 cm mesh sieve for uniformization of its particles and kept under ambient drying for one week. The treated sewage sludge was obtained from the Te?filo Otoni ETE, collected in the drying bed and taken to the laboratory, being autoclaved and sieved in 0.5 cm mesh sieves to standardize its particles. Then the mixture of the fibrilose residue with the sewage sludge was promoted in the proportions: T1(4,5:5,5), T2 (5,5:4,5), T3(6,5:3,5), T4(7,5:2,5) e T5(8,5:1,5) (Fibrilose: sewage sludge) (vol: vol). the materials were mixed and kept in styrofoam boxesfor 28 days, aiming at the stabilization of the blend. The other treatments used were: organic soil, Fertilize organic? compound and Bioplant? substrate. After this step styrofoam plates were used with cells to produce the seedlings. After filling the cells for seedling production, seeds of Papaya (Carica papaya) were sown; Passion fruit (Passiflora sp.), Eggplant (Solanum melongena), bell pepper (Capsicum annuum) and Tomato (Licopersicum sp.) 36 cells were used per experimental plot and the experiment with five replicates. The experimental design was entirely randomized. After germination, one seedling per cell was maintained. The following variables were evaluated: seedling survival index, shoot length, root length, root dry weight and aerial part. Statistical analysis was performed using the Statistical Program of Unesp. The chemical analyzes of the substrates were performed according to UESPA 3051. The results indicated a higher index of survival of the passion fruit compared to the other species tested and chemical analyzes indicated that the substrates produced from sewage sludge and fibrillose are in agreement with the standards of CONAMA 375/2006 and ing agreement with the MAPA, which has Standards for the use of substrates in agriculture. The elevation of manganese and potassium levels potentiated the death of eggplant and passion fruit seedlings, respectively. In relation to the development of the seedlings, it was verified that the fibrilose/ sewage sludge mixture, in the proportions T3 and T4 (Fibrillose / sewage sludge) presented positive results and in many cases higher When compared to the commercial substrate and other organic materials.

The study was made at Lubigi sewage treatment plant in Kampala, Uganda, during February and March 2018. The aim of this master thesis was to treat faecal sludge with two different methods, urea and lime, to investigate the efficiency of the chemicals to inactivate pathogens and to estimate the feasibility and the costs of the treatment. The chemical treatments were performed on sludge of two different moisture contents. The results from the treated sludge were compared with an untreated drying bed filled at the start of the study period to use as a control. The investigated pathogens were E. coli, bacteriophages and Ascaris eggs. The total solids and volatile solids were analysed, and the pH was measured. The results of the study including a calculation of costs were used to assess the feasibility of these treatment methods at Lubigi sewage treatment plant. The results show that the treatment using lime and urea reduces the level of active pathogens in the faecal sludge. The drying process in the beds at the treatment plant also decreases the level of detected pathogens in the sludge, but not to the same extent as when adding chemicals. The E. coli in the treated sludge were under the detection limit before the study period was done. Ascaris eggs were still detected in the sludge by the final sampling occasion. Further monitoring of the treated sludge might show an additional decrease of Ascaris since the time of storage after treatment enables pathogen die-off. The bacteriophages analyses only succeeded for two sampling occasions, although a decrease of detected phages is visible in the results. Again, the time of storage is significant for pathogen reduction, which is why a decrease of bacteriophages is expected if the sludge were to be further monitored. The feasibility of the two treatment methods is mainly restricted by costs. Lime treatment is approximately seven times more expensive than urea treatment and is also required in a larger amount to treat the sludge. On the other hand, using lime to treat faecal sludge is a proven and effective method. Further studies would improve the knowledge of the sludge characteristics at Lubigi and help determine the most preferable treatment for the sludge to protect the environment and public health. For example, by focusing on one treatment method, more detailed information can be gathered, and if performing a study in a larger scale, the representativeness would increase. To make sure there is no risk of spreading pathogens to the environment, further analyses should be carried out directly before selling the sludge to farmers.

Conhecer e estudar as propriedades do concreto e seus compósitos cimentícios, com e sem a incorporação de resíduos, é uma forma de propor melhorias na construção civil e contribuir com o desenvolvimento sustentável. Este trabalho propõe investigar o efeito da incorporação de um resíduo, como o lodo proveniente do tratamento de efluentes da indústria metal-mecânica, na piezoresistividade e no comportamento elétrico de um compósito cimentício. O lodo é um resíduo da indústria metal mecânica proveniente do tratamento de efluentes do processo de revestimento do aço. A piezoresistividade é uma propriedade elétrica que descreve a variação de resistência elétrica de alguns materiais quando submetidos a esforços e deformações mecânicas. Para esse estudo foram confeccionados corpos de prova cúbicos com uma mistura de cimento, areia e água onde foram adicionados diferentes percentuais de resíduo a ser comparado com a amostra de referência. O ensaio de piezoresistividade consistiu na aplicação de cargas de compressão que variaram de 0 a 2,1 kN e simultaneamente foram registradas as variações da resistência elétrica de cada amostra. A pesquisa tem caráter exploratório, portanto os ensaios realizados não tiveram temperatura e umidade controladas. As amostras com resíduo demonstraram maior potencial energético e maior piezoresistividade. O corpo de prova de referência apresentou valores de resistividade menor do que as amostras contendo lodo, na ordem de 5x106 Ω.cm e permanece praticamente constante quanto maior a pressão aplicada, ocorreu uma redução de apenas 1,73% na resistividade elétrica. Por outro lado, as amostras contendo lodo incorporado apresentam inicialmente resistividade entre 0,9 x 107 a 2,7 x 107 Ω.cm tendendo a diminuir drasticamente, 27 a 55% com a pressão aplicada, principalmente nas amostras contendo acima de 15 % de lodo. Dentre as amostras analisadas, a que possui 5% de resíduo, apresentou potencial elétrico na faixa de 2,48 x 10-2 W/cm² a 5,85 x 10-2 W/cm² nas aplicação de cargas de 90 a 1600 kPa. Logo, uma elevação de 135 %. Portanto, essa amostra foi a que demonstrou ser a mais ideal para a conversão energética por apresentar melhor resposta elétrica aliado à sua resistência mecânica. / Analysis of the piezoresistive behavior of concrete containing residual sludge from wastewater treatment of metal-mechanical industry abstract knowing and studying the properties of concrete with and without the incorporation of waste is one way to propose improvements in construction and contribute to sustainable development. This paper proposes to investigate the effect of incorporation of waste, as the sludge from wastewater treatment of the metal-mechanics industry, on piezoresistividade in a cementitious composite. The waste is a residual metal mechanics industry from the wastewater treatment of the coating process of steel. The piezoresistividade is an electrical property that describes the variation of electrical resistance of some materials when subjected to forces and mechanical deformations. For this study were prepared specimens cubic with a mixture of cement, sand and water were added different percentages of residue to be compared with the reference sample. The piezoresistividade test consisted in the application of compression charges that ranged from 0 to 2.1 kN and simultaneously we recorded the changes in electrical resistance of each sample. The research is exploratory character, so the tests did not have temperature and humidity controlled. The samples showed greater energy potential residue with and greater piezoresistividade. The body of evidence introduced reference values of resistivity less than the samples containing mud, in the order of 5x106 Ω.cm remains practically constant and the higher the applied pressure, a reduction of only 1.73% on electrical resistivity. On the other hand, samples containing embedded sludge present initially between resistivity 0.9 x 2.7 x 107 to 107 Ω.cm tending to decrease dramatically, 27 to 55% with the pressure applied, especially in samples containing up to 15%. One of the samples analysed that has 5% of waste was the one that proved to be the most ideal for energy conversion, due to your electrical response in the tests your ally mechanical resistance.

abstract: This dissertation is focused on environmental releases from U.S. wastewater infrastructure of recently introduced, mass-produced insecticides, namely neonicotinoids as well as fipronil and its major degradates (sulfone, sulfide, amide, and desulfinyl derivatives), jointly known as fiproles. Both groups of compounds recently have caught the attention of regulatory agencies worldwide due to their toxic effects on pollinators and on aquatic invertebrates at very low, part-per-trillion levels (Chapter 1). Mass balance studies conducted for 13 U.S. wastewater treatment plants (WWTPs) showed ubiquitous occurrence (3-666 ng/L) and persistence of neonicotinoids (Chapter 2). For the years 2001 through 2016, a longitudinal nationwide study was conducted on the occurrence of fiproles, via analysis of sludge as well as raw and treated wastewater samples. Sludge analysis revealed ubiquitous fiprole occurrence since 2001 (0.2-385 µg/kg dry weight) and a significant increase (2.4±0.3-fold; p<0.005) to elevated levels found both in 2006/7 and 2015/6. This study established a marked persistence of fiproles during both wastewater and sludge treatment, while also identifying non-agricultural uses as a major source of fiprole loading to wastewater (Chapter 3). Eight WWTPs were monitored in Northern California to assess pesticide inputs into San Francisco Bay from wastewater discharge. Per-capita-contaminant-loading calculations identified flea and tick control agents for use on pets as a previously underappreciated source term dominating the mass loading of insecticides to WWTPs in sewage and to the Bay in treated wastewater (Chapter 4). A nationwide assessment of fipronil emissions revealed that pet products, while representing only 22±7% of total fipronil usage (2011-2015), accounted for 86±5% of the mass loading to U.S. surface waters (Chapter 5). In summary, the root cause for considerable annual discharges into U.S. surface waters of the neonicotinoid imidacloprid (3,700-5,500 kg/y) and of fipronil related compounds (1,600-2,400 kg/y) is domestic rather than agricultural insecticide use. Reclaimed effluent from U.S. WWTPs contained insecticide levels that exceed toxicity benchmarks for sensitive aquatic invertebrates in 83% of cases for imidacloprid and in 67% of cases for fipronil. Recommendations are provided on how to limit toxic inputs in the future. / Dissertation/Thesis / Doctoral Dissertation Civil, Environmental and Sustainable Engineering 2017

Deficiencies in biotreatment due to uncontrolled growth of filamentous microorganisms is a problem for wastewater plants worldwide. The project was assigned with the task of reducing the growth of filamentous bacteria at the paper mill SCA Munksund. 12 bacteria and 1 fungi species were presented to the project as problematic due to their filamentous properties. Operating parameters affecting filamentous growth was examined and presented. The information gathered showed that a decrease in filamentous growth for 5 especially problematic bacteria could possibly be achieved by raising the DO, increasing the concentration of nutrients and decreasing the sludge age. Other parameters affecting the growth of filamentous bacteria, such as pH, temperature and F/M were found to be too diverse among the examined species. Alternative solutions not focused on finding optimal operating parameters was also investigated. Promising results were treatment using a feast-famine approach, installation of an anaerobic selector and ozonation of return sludge. A statistical analysis was also performed on operating data. Methods used were Principal component analysis, Clustering and Logistic regression. These were used as a proof of concept rather than providing meaningful data for an operating window.