沉淀与复分解联合回收草甘膦的处理与资源化途径  

Recovery of the Glyphosate from Wastewater by the Coupling Method of Precipitation and Metathesis

作　　者：高芳芳[1] 袁志文[1] 虞琳琳[1] 

机构地区：[1]同济大学环境科学与工程学院,上海200092

出　　处：《安徽农业科学》2011年第24期14747-14748,14760,共3页Journal of Anhui Agricultural Sciences

摘　　要：[目的]研究草甘膦生产废水中的草甘膦资源化回收利用途径。[方法]将钙盐和草甘膦在中性条件下反应,形成一种草甘膦钙盐白色沉淀,经过滤或者离心等进行固液分离,滤液废水达标排放;沉淀物质经再处理,即投加适量的Na2CO3进行动态复分解反应后析出草甘膦。[结果]讨论了pH、钙盐投加量、加碱方式、干燥方式等因素对草甘膦沉淀去除率的影响,并对可能的反应途径进行了分析。在最佳pH和加钙量下,草甘膦的沉淀去除率可达95%以上;最佳加Na2CO3量和温度条件下,草甘膦的回收率可达97.8%。[结论]通过钙盐沉淀与复分解联合回收草甘膦可以达到污染治理和资源化的双重目的。[Objective] The recovery method of glyphosate as resource material from wastewater was researched.[Method] The white precipitation material containing glyphosate calcium salt would be formed after the calcium ion was reacted with glyphosate under the neutral condition,then,the separation of the solid and liquid was conducted,the treated liquid without contamination could be discharged into natural water body,and finally,the glyphosate could be precipitated from the solid that was treated with Na2CO3 through the dynamic metathesis reaction.[Result] The effect of the pH value,the quantity of calcium-adding,the type of alkali and its adding way and the method of dehydration on the removal efficiencies of glyphosate was experimented and the possible pathway for the metathesis reaction was analyzed.Under the optimum experimental conditions,the removal efficiencies of glyphosate could reach over 95% after the precipitation and its recovery could be over 97% under the optimal of the pH value,the adding quantity of Na2CO3.[Conclusion] In this way,both the pollution-controlling and the utilization through the recovery of glyphosate could be realized.

关 键 词：草甘膦生产废水 加钙沉淀 复分解 回收利用 

分 类 号：X703.1[环境科学与工程—环境工程]