NaOH诱导渗沥液自絮凝的研究

Study on Self-flocculation of Landfill Leachate Induced by the Addition of NaOH

以生活垃圾渗沥液电导率、硬度、COD_(Cr)、浊度和沉淀量为监测指标,通过研究各指标变化规律,探讨NaOH对不同浓度垃圾渗沥液自絮凝效果的影响。研究结果表明:渗沥液浓度越高越有利于自絮凝;渗沥液自絮凝对浊度、硬度影响很大,对COD_(Cr)影响较小。当NaOH投加量分别为5.0、7.5、10.0 g/L时,40%、70%、100%浓度的渗沥液pH值均约12.50,此时自絮凝效果最佳,去浊率高达95%以上,硬度去除率高于93%,COD_(Cr)去除率约10%~20%。

Effects of NaOH on the self-flocculation of different concentration of landfill leachate were studied by monitoring the variation of conductivity,hardness,CODCr,turbidity and precipitation volume. As a consequence,leachate with increasing concentration facilitated its self-flocculation,and self-flocculation affected more on turbidity and hardness,but less on CODCr. With NaOH dosage of 5.0,7.5 and 10.0 g/L,pH of leachate with concentration of 40%,70% and 100% were all 12.50.With pH of 12.50,the optimal self-flocculation was obtained with the attainable high removal of turbidity,hardness and CODCr of up to 95%,93% and 10%~20%,respectively.