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碱浸钢丝污泥热处理后的金属形态及浸出特性
孔 明1, 韩 巍2, 纪中新3, 黄昭杰4, 杨 飞1, 彭福全1, 张毅敏1
1.环境保护部南京环境科学研究所;2.中日友好环境保护中心;3.江苏维尔利环保科技股份有限公司;4.河海大学
摘要:
以碱浸钢丝污泥(ALRS)为研究对象,通过批处理实验,研究了不同温度的热处理条件下碱浸钢丝污泥(ALRS)中Pb和Zn浸出特性及其化学形态变化,并运用重金属综合毒性指数模型(STI)对热处理ALRS中Pb、Zn的综合毒性进行了评估。结果表明:高温热处理使得ALRS的物相成分发生改变,钙-铁复合氧化物分解,形成单一铁氧化物及钙氧化物。热处理使得ALRS中Pb、Zn总量有一定程度增加,而在酸性条件下的浸出量降低。BCR形态分析表明,ALRS中Pb、Zn形态主要是以残渣态和可氧化态形式存在,经热处理后,Pb和Zn的残渣态含量明显增加,酸溶态、可还原态、可氧化态三种形态含量减少。综合毒性评估结果表明,重金属综合毒性指数模型(STI)值由原状样品的0.065减小至900℃下样品的0.046,重金属综合毒性和生态风险显著降低。
关键词:  碱浸钢丝污泥  热处理  重金属,化学形态  生态风险
DOI:
分类号:X703
基金项目:国家自然科学基金项目(41601538)
Study on Metals Morphology and Leaching Characteristics of ALRS after Heat Treatment
Kongming,Jizhongxin,Zhangyimin,et al
Abstract:
The changes of morphology and leaching characteristics of Pb and Zn of the alkali leaching sludge wire (ALRS) were studied at different temperatures through batch experiments. The toxicity index of Pb and Zn in ALRS was evaluated by the Synthesis Toxicity Index model(STI). The results show that the phase composition of ALRS converted from the calcium iron-complex oxides to iron oxide and calcium oxide with high temperature heat treatment.The total amount of Pb and Zn in ALRS increased with heat treatment, while the amount decreased under acidic conditions, According to the results of BCR speciation ,the Pb and Zn in ALRS are mainly in the form of residual and oxidizable fractions. The contents of residual fractions of Pb and Zn increased significantly after heat treatment, and the contents of acid-soluble,morphological and oxidizable fractions decreased.The results of comprehensive toxicity assessment showed that the value of STI of samples reduced from 0.065 at room temperature to 0.046 at 900℃, which indicated that the comprehensive toxicity and ecological risk of heavy metals reduced significantly.
Key words:  ALRS  Heat treatment  Heavy metals  Chemical fractions  Release characteristics