Coagulation–Flocculation Method for the Treatment of Pulp and Paper Mill Wastewater
作者： Tjoon Tow Teng , Sook San Wong , Ling Wei Low
DOI: 10.1016/B978-0-444-63283-8.00010-7
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摘要: Abstract The coagulation-flocculation method has been used to treat pulp and paper mill wastewater. Single-coagulant, single-flocculant, coagulant–flocculant processes have investigated. Treatment efficiency was studied taking into consideration various effects such as pH, type dosage of coagulant flocculant, settling characteristics, water recovery. Alum polyaluminum chloride (PACl) were coagulants. Nine cationic anionic polyacrylamides (PAMs) molecular weights charge densities chosen flocculants. For the single coagulant, both alum 1000 mg/l PACl 500 achieved higher than 90% treatment in turbidity reduction, TSS removal, COD reduction. From nine PAM flocculants studied, 5 polyacrylamide, Organopol 5415, with high weight low-charge density produced best flocculation efficiency: 95% 98% 93% sludge volume index (SVI) 14 ml/g. coagulation–flocculation process, showed better when combined 5415. results 99.7% 99.5% 95.6% an SVI 37 ml/g a time 12 seconds. A pilot scale study gave very similar results. recovery from process 96.3%.
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