本文關(guān)鍵詞： 含砷固廢 石灰鐵鹽渣 理化特性 浸出行為 BCR連續(xù)提取法　出處：《Transactions of Nonferrous Metals Society of China》2017年05期 　論文類型：期刊論文

【摘要】：以典型石灰鐵鹽法處理二種含砷廢水產(chǎn)生的污泥(污酸渣和砷酸鈣渣)為研究對(duì)象,采用ICP-AES、SEM-EDS、XRD、XPS和化學(xué)物相分析等檢測(cè)手段對(duì)其化學(xué)組成、形貌特征、物相結(jié)構(gòu)及砷的賦存狀態(tài)進(jìn)行研究,采用毒性浸出實(shí)驗(yàn)和BCR三步連續(xù)提取法考察污泥中砷的浸出行為。研究結(jié)果表明,污酸渣和砷酸鈣渣中砷的含量分別為2.5%和21.2%,主要組成物相為砷酸鹽及砷氧化物,均以無定型的顆粒均勻分散或團(tuán)聚在污泥中。砷的浸出毒性超出TCLP標(biāo)準(zhǔn)規(guī)定限值的119和1063倍,浸出率分別為47.66%和50.15%。砷以酸可提取態(tài)和可還原態(tài)為主,兩者共占90%左右,而穩(wěn)定的殘?jiān)鼞B(tài)含量相對(duì)較低,這是含砷石灰鐵鹽渣浸出毒性大、環(huán)境活性高的直接原因。本研究為含砷石灰鐵鹽渣無害化處理技術(shù)提供了大量有用的基本數(shù)據(jù)。
[Abstract]:Two kinds of sludge treatment of arsenic containing wastewater produced by lime ferric salt method (typical waste acid slag and calcium arsenate slag) as the research object, using ICP-AES, SEM-EDS, XRD, XPS and chemical phase analysis and feature detection methods of its chemical composition, phase structure and occurrence of arsenic were studied by the leaching test and BCR three step sequential extraction of arsenic in activated sludge was investigated. The results show that the leaching behavior of waste acid content, slag and slag calcium arsenate arsenic were 2.5% and 21.2%, the main composition phase of arsenate and arsenic oxides are amorphous particles dispersed or reunion in the sludge. The leaching toxicity of arsenic exceeded the TCLP standard limit of 119 and 1063 times, the leaching rate is 47.66% and 50.15%. respectively with arsenic acid extractable and reducible, both accounted for about 90%, the residual content and stability is relatively low, it is with arsenic leaching residue This study provides a large number of useful basic data for the harmless treatment technology of arsenic containing lime iron salt slag.

【作者單位】： 中南大學(xué)冶金與環(huán)境學(xué)院;中南大學(xué)國家重金屬污染防治工程技術(shù)研究中心;
【基金】：Project(201509050)supported by Special Program on Environmental Protection for Public Welfare,China Projects(51474247,51634010)supported by the National Natural Science Foundation of China Project(2015CX001)supported by Grants from the Project of Innovation-driven Plan in Central South University,China
【分類號(hào)】：X703
【正文快照】： 1 IntroductionArsenic pollution both in aqueous solutions[1-8]and contaminated soils[9-14]aroused a significantenvironmental concern.Various treatment processes suchas coagulation,precipitation,ion exchange andadsorption were extensively employed for the

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