Particle counter as a tool to control pre-hydrolyzed coagulant dosing and rapid filtration efficiency in a conventional treatment system.
Filtration efficiency in a conventional water treatment system was analyzed in the context of pre-hydrolyzed coagulant overdosing. Two commercial coagulants of different aluminum speciation were tested. A study was carried out at a water treatment plant supplied with raw water of variable quality. The lack of stability of water quality caused many problems with maintaining the optimal coagulant dose. The achieved results show that the type of coagulant had a very strong influence on the effectiveness of filtration resulting from the application of an improper coagulant dose. The overdosing of high basicity coagulant (PAC85) caused a significant increase of fine particles in the outflow from the sedimentation tanks, which could not be retained in the filter bed due to high surface charge and the small size of hydrolysis products. When using a coagulant of lower basicity (PAC70), it was much easier to control the dose of coagulant and to adjust it to the changing water quality.
Silesian University of Technology, Faculty of Energy and Environmental Engineering, Konarskiego 18, Gliwice 44-100, Poland E-mail: jolanta.guminska@polsl.pl.
Jolanta
J
Gumińska
Silesian University of Technology, Faculty of Energy and Environmental Engineering, Konarskiego 18, Gliwice 44-100, Poland E-mail: jolanta.guminska@polsl.pl.
Marcin
M
Kłos
D000535:Aluminum; D003029:Coagulants; D005374:Filtration / Q000379:methods*; D006868:Hydrolysis; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000379:methods*; D060753:Water Quality / Q000592:standards*
D003029:Coagulants; D000535:Aluminum