Excess sludge reduction using pilot-scale lysis-cryptic growth system integrated ultrasonic/alkaline disintegration and hydrolysis/acidogenesis pretreatment

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• 作者：Huaji Ma^a ; ^b ; ^{mahjh510@163.com} ; Shuting Zhang^a ; ^{zhangst@tju.edu.cn} ; Xuebin Lu^a ; ^{lxb3779@yahoo.com.cn} ; Bo Xi^a ; ^{xibotj@163.com} ; Xingli Guo^a ; ^{guoxingli86_06@163.com} ; Han Wang^a ; ^{roberto666@163.com} ; Jingxiao Duan^a ; ^{duanjingxiao5555@126.com}
• 关键词：Excess sludge reduction ; Cryptic growth ; Ultrasonication ; Alkaline treatment ; Hydrolysis/acidogenesis
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：July, 2012
• 卷：116
• 期：Complete
• 页码：441-447
• 文件大小：793 K

摘要

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, NH₄⁺-N, TP and pH in the supernatant of pretreated sludge were 1790 mg/L, 1530 mg COD/L, 261.1 mg/L, 114.0 mg/L, 93.1 mg/L and 8.69, respectively. The total operation cost of the lysis-cryptic growth system was $ 0.186/m³ wastewater, which was 11.4%less than that of conventional activated sludge (CAS) system without excess sludge pretreatment.