Entrapped biomass for removal of organics and total nitrogen from anaerobic reactor effluents
2018
Chen, Haon-Yao | Ng, Kok Kwang | Lee, Chien-Hsien | Chen, Tzu-Yang | Hong, Pui-Kwan Andy | Yang, Ping-Yi | Lin, Cheng-Fang
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 (EBT + 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 8–24 h. ΔCOD/ΔNO3 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 EBT + 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.
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