Effects of lime amendment on availability of heavy metals and maturation in sewage sludge composting
Effects of lime amendment on availability of heavy metals and maturation in sewage sludge composting
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DOI：
10.1016/s0269-7491(99)00056-1
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发表时间：
1999-01-01
影响因子：
8.9
通讯作者：
Wong, JWC
中科院分区：
文献类型：
--
作者：
Fang, M;Wong, JWC
进行了批量堆肥研究，以评估污水污泥与石灰共堆肥的可行性，旨在减少污泥堆肥中重金属的利用率。以锯末为填充剂的污水污泥用0、0.63、1.0和1.63% w/w的石灰进行修正，并在实验室间歇式反应器中堆肥100天。测量温度、pH、电导率 (EC) 和可提取重金属含量的变化，同时通过堆肥期间的 C/N 有机和水芹种子发芽来确定堆肥成熟度。石灰在堆肥初期有效提高了堆肥的pH值，并通过可溶性离子的沉淀导致EC降低。石灰改良剂还显着降低了水溶性和二亚乙基三胺五乙酸（DTPA）可萃取的金属含量。与对照相比，石灰改良污泥堆肥期结束时，Cu 的最大减少量为 60% 和 40%，Mn 的最大减少量为 80% 和 40%，Zn 的最大减少量为 55% 和 10%，Ni 的最大减少量为 20% 和 25%。尽管石灰改良剂对污水污泥的分解活性有抑制作用，但根据C/N有机比和水芹种子发芽试验结果表明，所有处理在堆肥63天后均达到成熟。建议使用小于或等于1.0%的石灰改良剂与污水污泥共同堆肥。 (C) 1999 Elsevier Science Ltd. 保留所有权利。
A batch composting study was performed to evaluate the feasibility of co-composting sewage sludge with lime, aiming at reducing the availability of heavy metals in the sludge compost. Sewage sludge with sawdust as bulking agent was amended with lime at 0, 0.63, 1.0, and 1.63% w/w, and composted for 100 days in laboratory batch reactors. The changes in temperature, pH, electrical conductivity (EC), and extractable heavy metal contents were measured while compost maturity was determined by C/N-organic and cress seed germination during the composting period. Liming raised pH of compost effectively at the initial stage of composting and caused a decrease in EC through precipitation of soluble ions. Lime amendment also significantly reduced water-soluble and Diethylene triamine pentracetic acid (DTPA)-extractable metal contents. The maximum reductions were 60 and 40% for Cu, 80 and 40% for Mn, 55 and 10% for Zn, and 20 and 25% for Ni at the end of the composting period for the lime-amended sludge as compared to the control. In spite of the inhibitory effect of lime amendment on the decomposition activity of sewage sludge, all treatments reached maturation after 63 days of composting as indicated by the results of C/N-organic ratio and cress seed germination test results. A lime amendment of less than or equal to 1.0% is recommended to co-compost with sewage sludge. (C) 1999 Elsevier Science Ltd. All rights reserved.