A Technical Study on Innocuous Disposal and Reutilization of Solid Arsenic Sludge
A large amount of polluted sludge is produced by a nonferrous metal factory after treating waste water with lime/ferrous salt.The concentration of arsenic in the dried sludge is high to 5.84%,a toxicity test is taken on the sludge according to GB5085.3-2007 and the extraction content is 15.75mg/L,which surpasses the arsenic extraction standard As≤5mg/L,the sludge is categorized as hazardous waste.If put outside without disposal,it would be very harmful to environments.Here we report an optimum protocol to extract arsenic;S2- alkaline liquor is utilized to treat the arsenic sludge.At 85℃,10L 7% S2- liquor is added into 1kg dried sludge and the resulting mixture is stirred for 120min at 250r/min,then separated by centrifugation and the compressed waste residue dried naturally.The average arsenic content is 1.40mg/L,lower than GB5085.3-2007 Standard and arsenic-free residue is consistent with GB18598-2001 Standard,which can be bury safely.The extracted arsenic is transferred into copper arsensite for use as addictive in copper electrolysis and the waste water can be recycle after calcium is removed.
Arsenic Pollution Arsenic Sludge Blended alkali Innocuous Disposal Reutilization
X.M.Yu L.Wu Y.H.Liu Q.X.Li L.S.Hu J.S.Sun
School of Environment and Civil Engineering,Wuhan Institute of Technology,Wuhan,Hubei,China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3740-3744
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）