Investigating the processes of wash water treatment of pumping-filtration plant No. 5 of Novosibirsk

Summary

Research activities on processing wash water and water sludge from pumping-filtration plant No. 5 of Novosibirsk carried out during 2005–2009 provided for exploring sludge separation from wash water; modes and amounts of wastewater and wash water from the treatment facilities. For taking the final decision on the structure of the facilities and their number, dimensions and operating modes of every unit additional studies of wash water treatment processes were carried out in 2013. The main results obtained in the process of model studies in a specially designed and constructed plant (mixing chamber, flocculation chamber, horizontal sedimentation tank, rapid filter) are presented. The task of the dynamic tests was determining the limit wash water loading on a section of the horizontal settler in order to provide for the drinking water quality after treatment. During the tests optimal dosages and chemical feed points were specified; the impact of wash water temperature on the treatment level was determined. After sedimentation wash water passed treatment in the model rapid filter to the quality that meets the requirements of SanPin (Sanitary Regulations and Norms). The results of modeling allowed confirming the sufficiency of the process horizontal sedimentation tank dimensions for adequate wash water treatment. The recommendations on designing the composition of the facilities for sedimentation and filtration of wash water from pumping-filtration plant No. 5.

Key words

turbidity , rapid filter , wash water , water temperature , model plant , sedimentation facilities

Features of Coagulation of Low Turbid, Color Water of the Vychegda Under Conditions of Low Temperature

Summary

Results of the reagent treatment of low turbid and color water of the Vychegda for the purpose of selection of the efficient method of its clarification is presented. The process of coagulation is characterized by the formation of small, poorly settling flakes. Low temperatures of water require increasing the optimal doses of coagulant almost two times and the optimal doses of flocculant more than two times. It is shown, that the water discoloration up to 5–10 degrees and its maximal clarification are achieved in and around of optimal pH values. The empirical dependences of a coagulant’s dose on influent water color with due regard for its temperature are given. The efficiency of low temperature water treatment depends substantively on flocculation process, the duration of which multiplies several times during the periods of water's low temperatures. Under these circumstances the pressure flotation is the most reasonable and efficient method of clarification.

Key words

clarification , chromaticity , flocculation , coagulant , flocculant , coagulation , alkalizing reagent , water temperature , pressure flotation