制革废水预处理

Tannery wastewater pre-treatment.

作者信息

Elsheikh Mahmoud Abdel-Shafy

机构信息

Faculty of Engineering, University of Tabuk, PO. Box 741, 71491 Tabuk, Saudi Arabia.

出版信息

Water Sci Technol. 2009;60(2):433-40. doi: 10.2166/wst.2009.351.

DOI:10.2166/wst.2009.351

PMID:19633385

Abstract

Tannery wastewater is one of the most pollution sources. It can cause environmental problems related to its high organic matter, suspended solids and chromium. Chromium (III) salts are the most widely used chemicals for tanning processes, causing the tannery wastewater to be highly pollutant with chromium. The main objective of this study is to investigate the pre-treatment of an actual Egyptian tannery wastewater using two systems; the first electrolytic system and the second physico-chemical system. The performances of electrolytic system at current of 10, 20, 30 and 40 A were discussed. Poor removal efficiencies of chemical oxygen demand (COD), total suspended solids (TSS), chromium (III), ammonia (NH(4) (+) and sulfide (S(2-)) were obtained. In the second physico-chemical system, calcium hydroxide was used as a coagulant material for chromium precipitation and plain sedimentation was applied for reducing of COD, biochemical oxygen demand (BOD(5)) and TSS. The results demonstrate 98.8% removal of chromium, 31% removal of COD, 25.8% removal of BOD(5) and 51.2% removal of TSS.

摘要

制革废水是最主要的污染源之一。由于其含有高有机物、悬浮固体和铬，会引发环境问题。铬（III）盐是制革过程中使用最广泛的化学品，导致制革废水含有高浓度的铬污染物。本研究的主要目的是使用两种系统对实际的埃及制革废水进行预处理；第一种是电解系统，第二种是物理化学系统。讨论了电解系统在10、20、30和40安培电流下的性能。化学需氧量（COD）、总悬浮固体（TSS）、铬（III）、氨（NH₄⁺）和硫化物（S²⁻）的去除效率较低。在第二个物理化学系统中，使用氢氧化钙作为铬沉淀的混凝剂材料，并采用自然沉淀法降低COD、生化需氧量（BOD₅）和TSS。结果表明，铬的去除率为98.8%，COD的去除率为31%，BOD₅的去除率为25.8%，TSS的去除率为51.2%。