Open AccessStudy of efficiency of mechanical and contact flocculation tanks
Author(s) -
Zhanna Govorova
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/775/1/012086
Subject(s) - flocculation , turbidity , agitator , filtration (mathematics) , sedimentation , mixing (physics) , environmental engineering , pulp and paper industry , environmental science , settlement (finance) , chemistry , materials science , chromatography , engineering , mass transfer , geology , mathematics , sediment , paleontology , oceanography , statistics , physics , quantum mechanics , world wide web , computer science , payment
The paper presents the data on the efficiency of using mechanical and contact flocculation tanks as a part of clarification and chromaticity removal technological scheme. The dynamics of variation in contaminants concentration depending on the dose of coagulant was studied. The curves of sedimentation of suspended matter in the settlement tank after the preliminary reagent treatment in the agitator and two different types of flocculation tanks. For low turbidity and low colored water reducing the chemical dosage requires more rapid and long-lasting water mixing in flocculation tanks. The studies have shown that the contact flocculation tank works effectively with a filtration rate up from 5 to 10 m/h, and a mechanical flocculation tank with a velocity gradient from 70.6 to 73.1 s −1 . The duration time of water in tanks should be at least 20-25 minutes. In addition, the parameters of contact flocculation tank flushing when the washing of the media is achieved.