混凝对老龄垃圾渗滤液的毒性削减试验研究

采用4种混凝剂处理老龄垃圾渗滤液,研究了pH值、投药量对处理效果的影响,并采用发光细菌法和呼吸耗氧速率法评估了处理前、后渗滤液的生物毒性和可生化性。结果表明,氯化铁和硫酸铝对老龄垃圾渗滤液有较好的处理效果。当两者混凝pH值分别为4.0和5.0、投药量分别为1.0g/L和2.0g/L时,UV254去除率分别达到70.0%和61.7%,COD去除率分别达到44.7%和48.3%。经氯化铁和硫酸铝混凝处理后水样相对发光度从原水的1.9%分别提高到27.2%和19.1%,毒性得到一定程度削减;呼吸耗氧速率较原水分别提高了2.65倍和3.04倍,可生化性得到改善。

Experimental study on detoxification of aged landfill leachate by coagulation process

4 kinds of coagulants were applied to treat aged landfill leachate, the influences of pH value and coagulants dosage on treatment effect were studied, and the biotoxicity and biodegradability of the landfill leachate before and after the treatment were estimated by photobacteria method and oxygen uptake rate method. The results showed that, ferric chloride and aluminum sulfate had good effects on aged landfill leachate treatment. When the pH values of the two coagulants were 4.0 and 5.0, the dosage were 1.0 g/L and 2.0 g/L, the removal rate of UV254 reached 70.0% and 61.7%, the removal rate of COD reached 44.7% and 48.3%, respectively. After the coagulation treatment by ferric chloride and aluminum sulfate, the relative luminosity of the water sample increased from 1.9% to 27.2% and 19.1%, the toxicity was decreased to a certain degree; furthermore, the oxygen uptake rate increased by 2.65 and 3.04 times respectively, which indicated that the biodegradability of the leachate was improved.