页岩气开采废水处理污泥危险特性研究及鉴别要点

Hazardous Characteristics of the Sludge from Treatment of Wastewater Produced by Shale Gas Development and Key Points for its Identification

页岩气开发产生的废水中通常含有总溶解固体、有机物、重金属、油脂等物质,对此类废水处理后产生的污泥的合理处理处置是页岩气绿色发展的一大难题。选取国内某页岩气开采废水处理站产生的脱水污泥作为研究对象,对其主要成分进行分析,并按照危险废物鉴别标准检测其浸出毒性和毒性物质含量。结果显示,污泥样品的主要成分为水、无机铝盐、无机铁盐,氯化物;样品浸出液重金属浓度、毒性有机物及毒性无机化合物含量均在危险性限值之内,得出该类脱水污泥不具有危险特性,不能被判定为危险废物的结论,并提出页岩气开采废水处理污泥危险特性鉴别需关注的要点。

The wastewater produced by shale gas development usually contains total dissolved solids,organic matter,heavy metals,fats and other substances,and the reasonable treatment and disposal of the sludge generated after the treatment of such wastewater is a major problem in the green development of shale gas.Dewatering sludge from a domestic shale gas extraction wastewater treatment station is selected as the research object,and its main components were analyzed,and the leaching toxicity and toxic substances contents were detected according to the identification standard of hazardous waste.The results showed that the main components of the sludge samples were water,inorganic aluminum salt,inorganic iron salt and chloride.The concentration of heavy metals,toxic organic compounds and toxic inorganic compounds in the sample leaching solution were all within the risk limits.It was concluded that the dehydrated sludge did not have dangerous characteristics and could not be judged as hazardous waste,and the key points that should be paid attention to in the identification of hazardous characteristics of sludge from shale gas mining wastewater treatment were put forward.