垃圾渗滤液二级生化出水絮凝深度处理中试研究

PILOT SCALE TEST ON FLOCCULATION TREATMENT OF LANDFILL LEACHATE' SECOND EFFLUENT

采用实验室所得垃圾渗滤液后处理专用镁铝脱色复合絮凝剂配方进行了批量扩大化生产,设计开发了中试专用絮凝反应设备,在垃圾填埋现场进行了絮凝中试。结果表明,优化处理量为100 L/h、搅拌速度为170 r/min、投药量为质量分数10%,在此条件下,COD、BOD5、色度、重金属去除率分别大于40%、45%、90%、88%,优于同类常规市售絮凝剂聚合氯化铁、聚合氯化铝、聚合硫酸铝铁;单一絮凝单元处理后的色度可降到32倍,处理后的Cu、As、Cr、Pb含量接近于0,符合GB 16889-2008相关要求。PMAS和专用絮凝反应器,为垃圾渗滤液处理提供了一种生化主处理+絮凝后处理的效率较高、经济性较好的技术选择。

Poly-aluminum（III）-magnesium（II）-sulfate dedicated to landfill leachate post-treatment was expanded production by batch, a special flocculation reactor was developed, and flocculation pilot scale tests were investigated at landfill site. The results show that the best capacity is 100 L/h, the best mixing speed is 170 r/min, the best drug dosage is 10%, COD removal rate is more than 40%, BOD5 removal rate is more than 45%, color removal rate is above 90%, heavy metal removal rate is above 88%, which are higher than those of merchant conventional flocculating agents such as poly-ferrum（III）-sulfate, poly-aluminum（III）-sulfate and poly-ferrum（III）-aluminum（III）-sulfate. The second effiuent＇s color after a single flocculation unit can reach to 32 times, and the contents of Cu, As, Cr, Pb are close to 0, Comply with the relevant requirements of GB 16889--2008. PMAS and special flocculation reactor could be a high-efficiency low-cost technical option for landfill leachate treatment： a biochemical main treatment followed by flocculation post-processing.