石灰在先进的综合废水池塘系统中增强了铬的去除效果。

Lime enhanced chromium removal in advanced integrated wastewater pond system.

作者信息

Tadesse I, Isoaho S A, Green F B, Puhakka J A

机构信息

Institute of Environmental Engineering and Biotechnology, Tampere University of Technology, P.O. Box 541, 33101 Tampere, Finland.

出版信息

Bioresour Technol. 2006 Mar;97(4):529-34. doi: 10.1016/j.biortech.2005.04.028. Epub 2005 Jun 15.

DOI:10.1016/j.biortech.2005.04.028

PMID:15963717

Abstract

The removal of trivalent chromium from a combined tannery effluent in horizontal settling tanks and subsequent Advanced Integrated Wastewater Pond System (AIWPS) reactors was investigated. The raw combined effluent from Modjo tannery had pH in the range of 11.2-12. At this pH, a trivalent chromium removal of 46-72% was obtained in the horizontal settling tanks after a one-day detention time. Trivalent chromium precipitated as chromium hydroxide, Cr(OH)3. 58-95% Cr(III) was removed in the advanced facultative pond (AFP) where the water column pH of 7.2-8.4 was close to pH 8, which is the optimum precipitation pH for trivalent chromium. Chromium removals in the secondary facultative pond (SFP) and maturation pond (MP) were 30-50% and 6-16%, respectively. With Cr(III) concentration of 0.2-0.8 mg/l in the final treated effluent, the AIWPS preceded by horizontal settling tanks produced effluent that could easily meet most of the current Cr(III) discharge limits to receive water bodies.

摘要

研究了在水平沉降池中以及随后的高级综合废水池塘系统（AIWPS）反应器中从综合制革废水中去除三价铬的情况。来自莫乔制革厂的原综合废水pH值在11.2至12之间。在此pH值下，经过一天的停留时间后，在水平沉降池中三价铬的去除率为46%至72%。三价铬以氢氧化铬Cr(OH)₃的形式沉淀。在高级兼性塘（AFP）中，水柱pH值为7.2至8.4，接近三价铬的最佳沉淀pH值8，在此处58%至95%的Cr(III)被去除。在二级兼性塘（SFP）和熟化塘（MP）中的铬去除率分别为30%至50%和6%至16%。最终处理后的废水中Cr(III)浓度为0.2至0.8毫克/升，先经过水平沉降池的AIWPS产生的废水能够轻松满足目前大多数向水体排放的Cr(III)排放限值。