title: Treatment and remediation of a wastewater lagoon using microelectrolysis and modified DAT/IAT methods.
abstract: To examine treatment and remediation of a wastewater lagoon with poor biodegradability, a typical wastewater lagoon in Tianjin, China, was treated and remedied using microelectrolysis and modified demand aeration tank (DAT)/intermittent aeration tank (IAT) methods. After pretreatment by microelectrolysis, the removal efficiency of chemical oxygen demand (COD) was up to 64.6% and the ratio of BOC/COD in the effluent increased from 0.013 to 0.609. The removal rates of COD(Cr) and NH4(+)-N were affected by sludge backflow rate, mixed liquor suspended solids (MLSS), and hydraulic retention time (HRT) in the modified DAT/IAT reactor. The highest removal rates of COD(Cr) and NH4(+)-N were up to 78.9% and 62.6%, respectively, when the sludge backflow rate was 38.0 mL/min, the total HRT was 8.0 hr and MLSS was 4088.0 mg/L. In this case, some protozoa and metazoa were observed in activated sludge and biofilm carriers. Most of chrominance was removed by microelectrolysis treatment, while the modified DAT/IAT methods were more effective for COD(Cr) and NH4(+)-N removal.
authors.affiliation: Tianjin Key Laboratory of Environmental Remediation and Pollution Control/Key Laboratory of Pollution Process and Environmental Criteria (Ministry of Education), College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China. celeste.woo09@gmail.com
authors.forename: Qiong
authors.initials: Q
authors.lastname: Wu
authors.forename: Tao
authors.initials: T
authors.lastname: Hua
authors.forename: Qixing
authors.initials: Q
authors.lastname: Zhou
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors; D002681:China; D055664:Electrochemical Techniques / Q000379:methods*; D014865:Waste Disposal, Fluid / Q000379:methods*