Entrapped biomass for removal of organics and total nitrogen from anaerobic reactor effluents
Journal
Bioresource Technology
Journal Volume
267
Pages
642-649
Date Issued
2018
Author(s)
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 (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. © 2018 Elsevier Ltd
Subjects
Concurrent nitrification and denitrification (CND); Delta COD to delta NO3; Entrapped bio-technology (EBT); Post-anaerobic treatment
Other Subjects
Denitrification; Energy conservation; Wastewater treatment; Activated sludge bioreactors; Anaerobic treatments; Delta COD to delta NO3; Domestic wastewater; Entrapped bio-technology (EBT); Hydraulic retention time; Nitrification and denitrification; Total nitrogen removal; Nitrogen removal; carbon; nitrate; nitrogen; organic compound; nitrogen; activated sludge; anoxic conditions; biomass; bioreactor; biotechnology; chemical oxygen demand; denitrification; effluent; nitrification; nitrogen; oxic conditions; pollutant removal; activated sludge; Article; biomass; biotechnology; chemical oxygen demand; denitrification; effluent; electron; entrapped biotechology; priority journal; retention time; waste water management; biomass; bioreactor; denitrification; sewage; Biomass; Bioreactors; Denitrification; Nitrogen; Sewage; Waste Disposal, Fluid
Publisher
Elsevier Ltd
Type
journal article