title: Excess sludge reduction using pilot-scale lysis-cryptic growth system integrated ultrasonic/alkaline disintegration and hydrolysis/acidogenesis pretreatment.
abstract: A pilot-scale lysis-cryptic growth system was built and operated continuously for excess sludge reduction. Combined ultrasonic/alkaline disintegration and hydrolysis/acidogenesis were integrated into its sludge pretreatment system. Continuous operation showed that the observed biomass yield and the sludge reduction efficiency of the lysis-cryptic growth system were 0.27 kg VSS/kg COD consumed and 56.5%, respectively. The water quality of its effluent was satisfactory. The sludge pretreatment system performed well and its TCOD removal efficiency was 7.9% which contributed a sludge reduction efficiency of 2.1%. The SCOD, VFA, TN, NH(4)(+)-N, TP and pH in the supernatant of pretreated sludge were 1790 mg/L, 1530 mg COD/L, 261.1mg/L, 114.0mg/L, 93.1mg/L and 8.69, respectively. The total operation cost of the lysis-cryptic growth system was $ 0.186/m(3) wastewater, which was 11.4% less than that of conventional activated sludge (CAS) system without excess sludge pretreatment.
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China. mahjh510@163.com
authors.forename: Huaji
authors.initials: H
authors.lastname: Ma
authors.forename: Shuting
authors.initials: S
authors.lastname: Zhang
authors.forename: Xuebin
authors.initials: X
authors.lastname: Lu
authors.forename: Bo
authors.initials: B
authors.lastname: Xi
authors.forename: Xingli
authors.initials: X
authors.lastname: Guo
authors.forename: Han
authors.initials: H
authors.lastname: Wang
authors.forename: Jingxiao
authors.initials: J
authors.lastname: Duan
mesh_terms: D000143:Acids / Q000494:pharmacology*; D000468:Alkalies / Q000494:pharmacology*; D001673:Biodegradation, Environmental / Q000187:drug effects; D057919:Biological Oxygen Demand Analysis; D002681:China; D002947:Cities; D006868:Hydrolysis / Q000187:drug effects; D010865:Pilot Projects; D012722:Sewage / Q000382:microbiology*; D014465:Ultrasonics; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000191:economics / Q000295:instrumentation / Q000379:methods*
chemical_list: D000143:Acids; D000468:Alkalies; D012722:Sewage