Complex Assessment of Processes of Wash Water Treatment at Water Supply Stations of the Western Siberia

Summary

Methods of treatment of wash water of water supply stations located at surface water sources of the Western Siberia are considered. The technology of the multiple use of wash water in the technological process at main facilities of pumping-filtration stations is offered. The basic properties of natural and wash waters are defined, sizes of the facilities required for qualitative treatment of wash water are calculated. Results of the experimental study and calculations made prove the possibility of application of the main technological scheme of natural water treatment (horizontal settling tanks and rapid filters) at operating treatment facilities for wash water treatment.

Key words

diffusion , wash water , horizontal settling tank , diffusion factor , sedimentation , hydraulic size

Comparative efficiency evaluation of a number of known flocculants

Summary

The results of comparative evaluation of coagulating activity of a number of known flocculants at full identity of all basic factors that affect the process of suspended and colloid-dispersed solids are presented. The investigations were carried out in laboratory conditions with model suspension of titanium dioxide in tap water with average solid phase particle size of 4.5 µm. The known flocculants were tested to compare their efficiency. The following series was received: Nalco 8103 ≤ Nanofloc ≤ VPK-402 ≤ Praestol 611 = Praestol 2510 ≤ Praestol 853 ≤ Praestol 655 ≤ Praestol 2500 ≤ Praestol 650. Comparing the flocculant efficiency with a fixed dosage of 5 mg/l resulted in another series: Nalco 8103 ≤ Nanofloc ≤ Praestol 611 ≤ VPK-402 ≤ Praestol 2510 ≤ Praestol 853 ≤ Praestol 655 ≤ Praestol 2500 ≤ Praestol 650. It was suggested to use 5 mg/l dosage of the following flocculants in the process of water clarification: Nalco 8103, VPK-402, Praestol 650, Praestol 655, Praestol 853, Praestol 2500, and 10 mg/l dosage of Nanofloc, Praestol 611, Praestol 2510. It was noted that the ion activity of the flocculants did not affect much their coagulating capacity. In the carried out tests the efficiency of all the tested flocculants was almost an order lower compared to that of aluminium- and iron-containing inorganic coagulants. The received results of the investigations can be used in removing suspended solids from natural and waste water.

Key words

clarification , coagulant , flocculant , sedimentation , suspension , coagulating capacity