pH值对剩余污泥水解酸化溶出物的影响  

The Characteristics of Activated Sludge Hydrolysis and Acidification Products at Different pH

作　　者：高永青[1] 张晶宇[1] 彭永臻[1] 王建龙[1] 巩有奎[1] 

机构地区：[1]北京工业大学北京市水质科学与水环境恢复重点实验室,北京100124

出　　处：《北京工业大学学报》2011年第1期139-145,共7页Journal of Beijing University of Technology

基　　金：'十一五'国家科技支撑计划重点项目(2006BAC19B03);北京市教委科技创新平台项目(PXM2008-014204-050843);北京高校人才强教计划高层次人才资助项目(PHR20090502)

摘　　要：在室温条件下(25℃),采用批量实验,研究了pH值在4.0～12.0变化时污泥水解酸化效率情况以及水解过程中溶出的可溶性有机物(SCOD)、挥发性有机酸(VFAs)和氮、磷的质量浓度变化.实验结果表明,污泥水解酸化效率递减顺序为碱性>酸性>中性.ρSCOD、ρVFAs、ρ(NH4+-N)和ρ(PO34--P)随时间延续而增大,并且都随pH值升高(4.0～11.0)而呈现出先减小后增大的趋势.在pH=11.0时,ρSCOD和ρVFAs值最大,分别为2 599 mg/L和749 mg/L;pH=4.0时,ρ(NH4+-N)和ρ(PO43--P)值最大,分别为208.1 mg/L和193.4 mg/L.通过调整pH值能改变污泥水解酸化效率,并且选择pH值在10.0～11.0时,可以协调水解酸化效率与后续脱氮除磷系统N、P负荷之间的关系,既为脱氮除磷系统提供SCOD和VFAs,又可以实现剩余污泥减量.The effect of pH value （4.0 - 12.0） of soluble chemical oxygen demand （SCOD）, volatile fatty acid （VFAs）, nitrogen and phosphate production in the activated sludge hydrolysis process was investigated at ambient temperature by batch experiments. The experiment results showed that the sequence for hydrolysis - acidification efficiency of activated sludge was： alkaline station, acidic station and neutral station. When the pH value was between 6.0 and 11.0, the efficiency increased with the increasing of pH, but when the pH was at 12.0, the activated sludge hydrolysis-acidification efficiency decreased because of the browning reaction. It was observed that the SCOD and VFAs production increased as the reaction time prolonged. While pH changed between the ranges of 4.0 - 11.0, PscoD and ρVFA, reflect a trend of declining first and then rising, with the neutral pH as the division point. When pH = 11.0 the concentrations of SCOD and VFAs were the highest, and the data were 2 599 and 749 rag/L, respectively. However, the concentrations of NH4＋-N and PO43--P reached the maximum when pH =4.0 with the data of 208.1 and 193.4 mg/L, respectively. Thus, by using pH value as the controlling parameter higher efficiencies of sludge hydrolysis and acidification could be achieved. Especially when pH value was between 10. 0 and 11.0, higher fermentation efficiencies and lower rates of nitrogen and phosphate releasing can be realized. This can bring more carbon source for nitrogen and phosphorus removal and reduce the quantity of excessive activated sludge within the wastewater treatment system.

关 键 词：水解酸化 PH值 可溶性有机物 挥发性有机酸 剩余污泥减量 

分 类 号：X703.1[环境科学与工程—环境工程]