Toxicity of copper in sewage sludge
Toxicity of copper in sewage sludge
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DOI：
10.1016/s0160-4120(02)00121-6
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发表时间：
2003-03-01
影响因子：
11.8
通讯作者：
Dave, G
中科院分区：
文献类型：
--
作者：
Fjällborg, B;Dave, G
污水污泥是有机物质和营养物质的来源，但其回收利用的主要障碍是城市污水污泥的污染物含量低但含量高。以大水蚤（Daphnia magna）、小莴苣（lena minor）和莴苣（Raphanus sativus）为研究对象，对铜在污水污泥中的急性毒性进行了研究。研究了污水污泥中添加CuSO4后渗漏水的毒性。毒力在前8 ~ 16 d呈上升趋势，随后开始下降。第一次毒性增加是由于氨，但32天后，发现了铜的剂量相关效应。64 d后，7 d的EC50为3800 mg Cu/kg dw， LOEC为3200 mg Cu/kg dw， NOEC为1600 mg Cu/kg dw。D. magna的EC50为18 100 mg Cu/kg dw （24 h静止），NOEC为12 800 mg Cu/kg dw。25 600 mg Cu/kg dw处理降低了红花根伸长。对于水蚤和柠檬，泄漏水的pH值对毒性都有影响。这意味着化学形态和生物有效性对铜在污泥和土壤中的危害评价是非常重要的。(C) 2002 Elsevier Science Ltd.版权所有。
Sewage sludge is a source of organic matter and nutrients, but a major obstacle for its recycling is that the municipal wastewater sludge has low but significant levels of contaminants. This investigation, on the acute toxicity of copper in sewage sludge, was conducted with three organisms, Daphnia magna, Lemna minor and Raphanus sativus (seeds). The toxicity of the leakage water from sewage sludge spiked with CuSO4 was studied for 64 days. The toxicity increased during the first 8-16 days and then started to decrease. The first increase in toxicity was due to ammonia, but after 32 days, a dose-related effect of copper was found. After 64 days, L. minor had an EC50 of 3800 mg Cu/kg dw for 7 days growth inhibition, a LOEC of 3200 mg Cu/kg dw and a NOEC of 1600 mg Cu/kg dw. D. magna had an EC50 of 18 100 mg Cu/kg dw (24-h immobility) and a NOEC of 12 800 mg Cu/kg dw. Root elongation of R. sativus was reduced at 25 600 mg Cu/kg dw. Both for Daphnia and Lemna, the pH of the leakage water had an effect of the toxicity. This means that chemical speciation and bioavailability is very important for the hazard assessment of copper in sludge and soil. (C) 2002 Elsevier Science Ltd. All rights reserved.