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POLYMERS IN ALUM SLUDGE DEWATERING: DEVELOPMENTS AND CONTROL
Author(s) -
Bache D. H.,
Papavasilopoulos E. N.,
Rasool E.,
Zhao Y. Q.,
McGilligan J. F.
Publication year - 2003
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.2003.tb00442.x
Subject(s) - alum , turbidity , filtration (mathematics) , dewatering , flocculation , suspended solids , coagulation , polymer , water treatment , environmental science , environmental engineering , waste management , pulp and paper industry , wastewater , materials science , engineering , mathematics , geotechnical engineering , geology , composite material , psychology , oceanography , statistics , psychiatry , metallurgy
The paper (a) discusses the use of polymers for conditioning alum sludge derived from the coagulation of low turbidity coloured waters, and (b) reviews the factors which control the optimum dosage vis a vis individual test methods such as specific resistance to filtration and capillary suction time. It was demonstrated that good estimates of the solids feed could be obtained via the suspended‐solids concentration in the flocculators. An algorithm based on water‐quality parameters was recommended for planning purposes. Difficulties arising from variations in the solids delivery to the thickeners were shown to influence the separation efficiency. The paper also includes a survey of polymer routeing within a water‐treatment plant in which there was multiple polymer use and extensive recycling; this identified a number of quality‐control issues and demonstrated the value of polymer measurement.