期刊
ENVIRONMENTAL TECHNOLOGY
卷 38, 期 20, 页码 2562-2572出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2016.1271017
关键词
Direct membrane filtration; wastewater solids concentration; anaerobic digestion; gas sparging; membrane cleaning
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq, National Council for the Scientific and Technological Development, Brazil)
The high content of particulate matter in municipal wastewater hinders the conventional anaerobic treatments at psychrophilic temperatures. The hydrolysis of the particulate chemical oxygen demand (pCOD) could be the limiting step under these conditions. Therefore, new pretreatments or improved conventional pretreatments are needed in order to separate pCOD. In this work, direct membrane filtration of municipal wastewater, using an ultrafiltration membrane, was investigated. This intensive pretreatment, which aims to separate soluble chemical oxygen demand (sCOD) and to concentrate pCOD, together with anaerobic treatments of both streams at psychrophilic and mesophilic conditions respectively, could be an alternative to the conventional activated sludge process. The obtained results show a removal yield of 24.9% of the total solids (TS) and 45% of total chemical oxygen demand (tCOD), obtaining a permeate free of suspended solids. This physical removal implies the accumulation of solids inside the membrane tank, reaching the values of 45.4 and 4.4g/L of TS in the sedimentation and filtration sections, respectively. The membrane operated with filtration, backwashing cycles and continuous gas sparging, with a permeate flux predominantly around 10L/(m(2)h). The results show the viability of the technology to concentrate pCOD and so to improve energy recovery from municipal wastewater.
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