Ion Exchange Extraction of Heavy Metals from Wastewater Sludges

Heavy metals are common contaminants of some industrial wastewater. They find their way to municipal wastewaters due to industrial discharges into the sewerage system or through household chemicals. The most common heavy metals found in wastewaters are lead, copper, nickel, cadmium, zinc, mercury, a...

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Bibliographic Details
Published in:Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Toxic/hazardous substances & environmental engineering, 2004-01, Vol.39 (2), p.455-464
Main Authors: Al-Enezi, G., Hamoda, M. F., Fawzi, N.
Format: Article
Language:English
Subjects:
Chromium
Effluents
Extraction
Heavy metals
Industrial Waste
Ion exchange
Ion Exchange Resins
Metals, Heavy - isolation & purification
Municipal sludge
Sewage - chemistry
Sludge
Tertiary effluent
Toxic
Toxicology
Waste Disposal, Fluid
Waste water
Wastewater
Wastewater treatment
Water Purification - methods
Zinc
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Summary:Heavy metals are common contaminants of some industrial wastewater. They find their way to municipal wastewaters due to industrial discharges into the sewerage system or through household chemicals. The most common heavy metals found in wastewaters are lead, copper, nickel, cadmium, zinc, mercury, arsenic, and chromium. Such metals are toxic and pose serious threats to the environment and public health. In recent years, the ion exchange process has been increasingly used for the removal of heavy metals or the recovery of precious metals. It is a versatile separation process with the potential for broad applications in the water and wastewater treatment field. This article summarizes the results obtained from a laboratory study on the removal of heavy metals from municipal wastewater sludges obtained from Ardhiya plant in Kuwait. Data on heavy metal content of the wastewater and sludge samples collected from the plant are presented. The results obtained from laboratory experiments using a commercially available ion exchange resin to remove heavy metals from sludge were discussed. A technique was developed to solubilize such heavy metals from the sludge for subsequent treatment by the ion exchange process. The results showed high efficiency of extraction, almost 99.9%, of heavy metals in the concentration range found in wastewater effluents and sludges. Selective removal of heavy metals from a contaminated wastewater/sludge combines the benefits of being economically prudent and providing the possibility of reuse/recycle of the treated wastewater effluents and sludges.
ISSN:1093-4529
1532-4117
DOI:10.1081/ESE-120027536