Ecotoxicity, phytotoxicity and extractability of heavy metals from different stabilised sewage sludges
Ecotoxicity, phytotoxicity and extractability of heavy metals from different stabilised sewage sludges
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DOI：
10.1016/j.envpol.2005.11.035
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发表时间：
2006-09-01
影响因子：
8.9
通讯作者：
Meseguer, Victor F.
中科院分区：
文献类型：
--
作者：
Fuentes, Ana;Llorens, Mercedes;Meseguer, Victor F.
废水处理厂产生的污泥中存在重金属，限制了其农业用途。本研究比较了不同类型的污泥（好氧，厌氧，不稳定和污泥从废物稳定池），以评估使用简单的提取，水和DTPA的重金属的可提取性。污泥的稳定化处理影响重金属的可提取性。最少矿化污泥（不稳定和有氧）表现出较高的金属提取。在没有基质的情况下，对污水污泥进行化学表征和毒性测试（生态毒性和植物毒性测定），以初步评估其是否适合土地应用。生态毒性分析证实，没有污泥构成危险废物。污泥浸提液对大麦发芽指数有显著的不利影响。和水芹（独行菜），一个事实表明，一些特点影响根的生长，（c）2005年爱思唯尔有限公司保留所有权利。
The presence of heavy metals in the sludges produced in wastewater treatment plants restricts their use for agricultural purposes. This study compares different types of sludges (aerobic, anaerobic, unstabilised and sludge from a waste stabilisation pond) in order to assess the extractability of heavy metals using simple extraction, water and DTPA. The stabilisation treatment undergone by the sludges influenced the heavy metals extractability. The least mineralised sludges (unstabilised and aerobic) showed higher metal extractability. The sewage sludges were subjected to chemical characterisation and toxicity testing (ecotoxicity and phytiotoxicity assays) in absence of substrate, to provide a preliminary assessment of their suitability for land application. The ecotoxicity assays confirmed that no sludge constituted a hazardous waste. The sludge extracts had significant adverse effect on the germination index (GI) of barley (Hordeum vulgare L.) and cress (Lepidium sativum L.), a fact which indicates that some characteristics affected root growth, (c) 2005 Elsevier Ltd. All rights reserved.