剩余污泥减量化工艺条件优化研究

运用超声处理连续流活性污泥系统中不同种类的污泥,并将其回流至原系统中,研究其剩余污泥减量化效果。按正交实验设计并进行试验,确定最优工艺条件。结果表明:当声能密度为0.6 W/mL,作用时间为5 min,超声污泥为混合污泥,回流比为7∶120时,减量效果最佳。且在该条件下经一周期的运行,污泥减量效果达到96.24%,COD由进水的830 mg/L降至44 mg/L,NH4+-N和TN分别由进水的62.43 mg/L和103.19 mg/L,降解到2.31 mg/L和6.52 mg/L,达到《城镇污水处理厂污染物排放标准》(GB18918-2002)一级排放标准。

Study on optimization of technical conditions of waste sludge reduction

Different kinds of sludge produced in the activated sludge system of continuous flow running stably was processed with ultrasound and made back to the system, and the reduction effect of waste sludge was studied. An orthogonal experimental program was designed and carried out to determine the optimal operation conditions. The results of this study shows that the reduction effect of sludge is the best when the mixed sludge processed by energy density of 0.6 W/mL, ultrasonic time of 5 min, and the recycling ratio of ultrasonic sludge of 7/120. And operating the system for one period under the above conditions, the rate of reduction is 96.24%, COD declines to 44 mg/L from 830 mg/L initially, the effluent NH⁺₄-N and TN drop from 62.43 to 2.31 mg/L and 103.19 to 6.52 mg/L, respectively, which have achieved first-degree discharge standard based on discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002).