Paramasivam S, Sajwan K S, Alva A K, VanClief D, Hostler K H
Savannah State University, Marine, Environmental Sciences and Biotechnology Research Center, Savannah, Georgia 31404, USA.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2003 May;38(5):807-21. doi: 10.1081/ese-120018593.
Sewage sludge (SS) is the major solid waste of sewage and wastewater treatment plants in cities around the world. Even though treated effluent water from wastewater treatment plants are utilized for irrigation, disposal of sewage sludge is becoming a serious problem. This is due to its high content of certain heavy metals still posing threat of accumulation in plants and groundwater contamination when it is used as soil amendment or disposed in landfills. Water treatment plants incinerate the dewatered activated sewage sludge (ISS) and dissolve the ash in water to store in ash ponds for long-term storage (WISS). A study was undertaken to evaluate the transport and leaching potential of various elements and their distribution within soil columns amended with various rates of ISS. Results of this study indicates that ISS from wastewater treatment plants can be used as soil amendment on agricultural lands at low to medium rates (< or = 100 Mg ha(-1)) without causing potential loading of metals into groundwater.
污水污泥是全球城市污水处理厂产生的主要固体废物。尽管污水处理厂处理后的出水用于灌溉，但污水污泥的处置正成为一个严重问题。这是因为其某些重金属含量高，当用作土壤改良剂或填埋处置时，仍有在植物中积累和污染地下水的威胁。水处理厂焚烧脱水活性污水污泥（ISS），并将灰分溶解在水中，储存在灰池中进行长期储存（WISS）。开展了一项研究，以评估不同元素在用不同比例ISS改良的土壤柱中的迁移和淋溶潜力及其分布。这项研究的结果表明，污水处理厂的ISS可以以低至中等比例（≤100 Mg ha(-1)）用作农田的土壤改良剂，而不会导致金属潜在地进入地下水。
