Influences of Different Conditioners on Dehydration Ratio of Activated Sludge

[摘要] Excess sludge contains a large quantity of water with water content reaching about 97%-99%. Besides microorganisms and germs, the sludge is of complicated composition, including heavy metals, persistent organic pollutants, PPCPs, endocrine disrupters, etc. It covers a large area with harmfulness, so it needs further treatment. However, due to existence of extracellular polymeric substances in the sludge, the sludge has poor dehydration property, so how to improve dehydration of sludge is a difficult point in water treatment industry. Chemical conditioning - mechanical dehydration method is sludge dehydration technology which has been widely applied in China. Most sludge treatment plants use organic and inorganic conditioners like polyacrylamide (PAM), polyaluminum chloride (PAC) and polymerized ferrous sulfate (PFS), etc. With characteristics of low toxicity and degradation resistance, these conditioners pose potential risks to the environment and they are adverse to follow-up resource utilization. Therefore, influences of 17 conditioners on sludge dehydration ratio were discussed in this paper, expecting to seek for green, environmentally friendly and highly efficient conditioner so as to improve resource utilization ratio of sludge.

[发布机构] South China Institute of Environmental Sciences. MEP, Guagndong Guangzhou; 510655, China^1;South China Environmental Protection Supervision Centre. MEP, Guagndong Guangzhou; 510655, China^2;Guangdong Lvmei Environmental Technology Co., Ltd., China^3

[效力级别] 生态环境科学

[关键词] Chemical conditioning;Degradation resistance;Extra-cellular polymeric substances;Persistent organic pollutant (POP);Polyaluminum chloride;Polymerized ferrous sulfate;Resource utilization ratios;Sludge treatment plants