化工生化剩余污泥稳定化研究

Stabilization of Biochemical Excess Sludge from Chemical Wastewater Treatment Process

化工企业在生产过程中不可避免地产生大量生化剩余污泥,相较于市政剩余污泥,此类污泥含有更多的有机物,更加难处理。为此,利用自主研发的剩余污泥稳定化处理技术,对华南某化工厂的生化剩余污泥开展工业侧线试验,取得了较好的效果。在稳定剂/MLVSS=0.70、反应温度为175℃、反应时间为2 h的最佳处理条件下,化工生化剩余污泥的稳定化率可达到66%以上,减量率达到98.9%以上,泥饼含水率在60%以下;污泥脱水液pH呈中性,BOD5/COD在0.3以上,属于易生化处理的污水,且该股水量较少,可直接送至污水厂进行处理。

Chemical enterprises inevitably produce a large amount of biochemical excess sludge in the production process.Compared with municipal excess sludge,this kind of sludge contains more organic matter and is more difficult to treat.Therefore,the industrial sidestream test of biochemical excess sludge from a chemical plant in South China was carried out and good results were obtained by using the self-developed excess sludge stabilization technology.Under the optimal treatment conditions as follows:stabilizer to MLVSS ratio of 0.70,reaction temperature of 175℃and reaction time of 2 h,the stabilization rate of the excess sludge was more than 66%,the reduction rate was more than 98.9%,and the moisture content of the mud cake was less than 60%.The pH of sludge dewatering liquid was neutral,and BOD5/COD was above 0.3,indicating that the sludge dewatering liquid was easily biodegradable.In addition,the volume of the sludge dewatering liquid was small,which could be directly discharged to the wastewater treatment plant.