title: Pretreatment of landfill leachate using deep shaft aeration bioreactor (DSAB) in cold winter season.
abstract: A pilot-scale deep shaft aeration bioreactor (DSAB) with 110 m in depth and 0.5m in diameter for the pretreatment of landfill leachate in winter was operated at a daily treatment scale of around 10-20 tons. It was found that the performance of the DSAB mainly depended on the inflow loads and concentrations of pollutants. NH3-N, TN, COD, TOC removals of 66-94%, 41-64%, 67-87%, 55-92% at organic load rate of 1.7-9.4 g CODL(-1)day(-1) and hydraulic retention time of 1-2d were obtained using DSAB, respectively, with the lowest ambient temperature of -3 °C. The effluent COD can be reduced to below 1000 mg/L, an acceptable level for advanced treatment using reverse osmosis system, when the influent COD was below 7000 mg/L at 10t/d. The EEM and GPC analysis implied that the non-biodegradable contaminants such as humic- and fulvic-like DOM dominated in the organic fractions of the effluent, which rendered the biological treatment ineffective. Compared with 20-40% removals obtained using traditional biological processes below 15 °C, DSAB showed a higher treatment efficiency for COD and NH3-N, even though at adverse conditions of poor carbon source, lower C/N ratio and high nitrite concentrations in the leachate of test.
authors.affiliation: The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Niu
authors.forename: Tongju
authors.initials: T
authors.lastname: Zhang
authors.forename: Yijia
authors.initials: Y
authors.lastname: He
authors.forename: Haiyan
authors.initials: H
authors.lastname: Zhou
authors.forename: Aihua
authors.initials: A
authors.lastname: Zhao
authors.forename: Youcai
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D000332:Aerobiosis; D000641:Ammonia / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D001578:Benzopyrans / Q000378:metabolism; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002244:Carbon / Q000032:analysis; D003080:Cold Temperature; D006812:Humic Substances; D009566:Nitrates / Q000378:metabolism; D009573:Nitrites / Q000378:metabolism; D012037:Refuse Disposal; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D001578:Benzopyrans; D006812:Humic Substances; D009566:Nitrates; D009573:Nitrites; D014874:Water Pollutants, Chemical; D002244:Carbon; D000641:Ammonia; C005023:fulvic acid