Journal
WATER QUALITY RESEARCH JOURNAL OF CANADA
Volume 42, Issue 1, Pages 63-71Publisher
IWA PUBLISHING
DOI: 10.2166/wqrj.2007.009
Keywords
pulsed electro-chemical method; electrocoagulation; coagulant; OCC based paper mill; wastewater; electrochemistry
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Funding
- Taiwan Forestry Research Institute
- Capital Engineering Consultation Co
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There is an increasing trend towards the closure of white water recirculation loops in papermaking, often leading to need for system modification A pilot-scale study was conducted using pulsed electrocoagulation technology to treat the wastewater of an old corrugated containerboard (OCC)-based paper mill, to evaluate its treatment performance The operating variables were a current density of 0 to 240 A/m(2), a hydraulic retention time of 8 to 16 mm and a coagulant (anionic polyacrylamide) dosage of 0 to 30 mg/L The water quality indicators investigated were electrical conductivity, suspended solids (SS) and chemical oxygen demand (COD) The results obtained during the pilot-scale studies were favourable Under the operating conditions without coagulant addition, the highest removals for conductivity, SS and COD were 47 7%, 99 3% and 75%, respectively The use of coagulant remarkably enhanced the removal of both conductivity and COD Using a coagulant dosage of 30 mg/L, the highest removal rates achieved for the three water quality indicators were 54 5%, 99 6% and 92 7%, respectively These water quality levels are adequate to allow for the reuse of at least a part of the treated wastewater as makeup process water in papermaking
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