Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7065887 | Bioresource Technology | 2018 | 39 Pages |
Abstract
Anaerobic processes have been applied to treat low-strength domestic wastewaters with significant energy saving. However, anaerobic process effluents must be further removed of residual organics and total nitrogen before discharge. Reported here are an aerobic entrapped bio-technology (EBT) system and an EBT coupled with activated sludge (EBTâ¯+â¯AS) system being tested as a post-anaerobic treatment. Both systems have been operated under aerobic condition to provide organics and total nitrogen removal, achieving COD removal by 74-88% and TN removal by 58-65% at hydraulic retention times of 8-24â¯h. ÎCOD/ÎNO3 ratios that represent the carbon usage efficiency as electron donors for denitrification were 1.82-1.93 in the EBT and 2.01-2.02 in the EBTâ¯+â¯AS systems, with both ratios being lower (i.e. more efficient) than 6 typically required in traditional activated sludge bioreactors. Both systems demonstrate promise for polishing removal of COD and TN.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Haon-Yao Chen, Kok Kwang Ng, Chien-Hsien Lee, Tzu-Yang Chen, Pui-Kwan Andy Hong, Ping-Yi Yang, Cheng-Fang Lin,