2014-07-292010-12-022010-08-31BUFÁIÇAL, Daniela de Souza Silva. Efficiency of constructed wetlands on removing helminths eggs and thermotolerant coliforms and sewage sludge dewatering. 2010. 90 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2010.http://repositorio.bc.ufg.br/tede/handle/tde/602This study aimed to evaluate the efficiency of a constructed wetlands planted with the vegetal species white ginger (Hedychium coronarium J. König), narrow leaf cattail (Typha angustifolia L.) and papyrus sedge (Cyperus gigantus) under three charges application of the sludge from the sewage treatment station of Goiânia, Goiás, Brazil, in the reduction of thermotolerant coliforms and viable helminths eggs and sludge dewatering. It also aimed to characterize the sludge and to evaluate the quality of the filtrate, and to investigate the occurrence of substances excreted by the macrophytes roots, which may help reduce pathogens. The experiment was conducted at the Goiânia sewage treatment station. To evaluate the reduction of pathogens, the sludge dewatering and the filtrate quality were used 12 plastic containers, each one with 1 m3 of volumetric capacity, filled with support media containing 5 cm of gravel number one, a geotextile blanket and 20 cm of sand. In the gravel was installed a drainage system of gases, consisting of a PVC tube with 25 mm in diameter, in an "L" format, whose horizontal portion was drilled with holes of 4 mm in diameter. The sludge was applied at application rates of 43, 140 and 248 kg TS m-2 year, bringing the rates of 20, 70 and 120 L m-2 week, respectively. The applications of sludge were divided into two times a week, half on Tuesdays and half on Fridays. After three months of application, samples were taken from the dewatered sludge every 14 days, and sent to the laboratory for solids, thermotolerant coliforms and viable helminths eggs determination. During three weeks the filtrate was collected in each container and submitted to analysis of solids and thermotolerant coliforms. To investigate the release of toxins by macrophytes roots were used four 20 L buckets containing sand as support medium. Three buckets were planted with the species of macrophytes and one wasn t planted. The buckets were irrigated with dechlorinated water for four months, keeping the water level inside the buckets at 5 cm from the substrate surface. After this period 2 L samples of effluent from each bucket were collected and sent to the laboratory to investigate the antimicrobial activity. The results were analyzed using the Statistical Analysis System (SAS), performing F and Tukey Kramer (5% probability) tests. About the filtrate there was no significant difference in the removal of solids and thermotolerant coliforms in the rates of 70 L m-2 week and 120 L m-2 week. At the rate of 20 L m-2 week there was no filtrated material. For the dewatered sludge there was no significant difference in the removal of thermotolerant coliforms, viable helminths eggs and solids concentration among the treatments. The total solids were lower at the application rate of 120 L m-2 week. Plant development was hampered by sludge application and at the application rate of 120 L m-2 week, the species narrow leaf cattail and papyrus sedge had died after three months of sludge aplication. The extracts found at the water in contact with the macrophytes roots didn t inhibit microbial activity. The dewatered sludge treated by the constructed wetlands attended the 375 Conama Resolution for type A sludge for viable helminthes eggs and for type B sludge for thermotolerant coliformsapplication/pdfAcesso Abertozona de raízesdesaguamento de lodoatividade antimicrobianaroot zonesludge dewateringantimicrobial activityCNPQ::ENGENHARIAS::ENGENHARIA SANITARIA::RECURSOS HIDRICOSDissertação