Modern coagulants and flocculants in the cleaning of washing waters of water treatment plants

[摘要] This paper contains a comparative analysis and the principle of the action of modern coagulants and flocculants, used in the purification of natural and waste water, laboratory studies based on the processes of cleaning the washing water of the fast filters of water treatment plants in the cities of Tyumen and Kurgan with the selection of the most effective coagulants and flocculants The following reagents were studied: coagulants - aluminum sulphate (AS), aluminium oxychloride (AO). Flocculants - polyacrylimide (PA), Praestol 650, Flopam FO4140SH and a mixture of the given chemicals. The results reveal that using coagulants with the subsequent introduction of flocculants for the summer period is the most effective (the optimal doses are Praestol 0,4 mg/l and Flopam 0,4 mg/l), using a mixture of coagulants AS (12 mg/l)+AO (6 mg/l) is most preferable in winter, while in spring it is recommended to use a mixture of coagulants AS (12 mg/l)+AO (6 mg/l) with the flocculant PA (1,5 mg/l) added. The introduction of filters into the technological scheme for the wash water clarification will make it possible to exclude the discharge of contaminated water into the water bodies; to reduce the amount of water for its own needs.

[发布机构] Department of General and Special Chemistry, Industrial University of Tyumen, Lunacharsky Str. 2, Tyumen; 652001, Russia^1

[学科分类] 土木及结构工程学

[关键词] Aluminum sulphate;Comparative analysis;Contaminated water;Laboratory studies;Oxychlorides;Technological scheme;Washing water;Waterbodies