Tag:hydraulic size

№6|2018

SURFACE RUNOFF TREATMENT

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UDC 628.33

Gandurina L. V., Kvitka L. A., Nikitin R. A., Ansimov A. D.

Effect of dispersion characteristics of suspended solids
on the parameters of surface runoff treatment

Summary

Quantitative and dispersion characteristics of insoluble pollutants in rainfall and snow-melt water and its effect on the parameters of removing pollutants from water by sedimentation, chemical free and chemical filtration are considered. It is shown that the concentration of suspended solids in surface runoff multiply exceeds the concentration of oil products whereupon these pollutants are present in the form of two-component particles. In the particles oil products or inorganic admixtures can be adsorbed components, and during sedimentation of surface runoff suspended solids and oil products are being removed synchronically. The concentration and kinetic consistency of suspended solids from residential areas are lower than those from highways; which reduces the sedimentation time in the storage settling tank and concentration of pollutants in settled water. During 1–3 days of settling tank empting monotonic reduction of suspended solids concentration in settled water before filtration occurs. Fluctuation range depends on the sedimentation time in the settling tank, initial suspended solids concentration and tank empting time. The use of coagulants before filtration of settled surface runoff from highways provides for improving the treatment efficiency and obtaining sustained quality of filtered water.

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№2|2011

WATER SUPPLY

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UDC 628.3.034.2:628.169.2

Artemenok N. D., Urvantseva M. I.

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.

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№9|2014

DRINKING WATER SUPPLY

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UDC 628.16

Gandurina L. V.

The use of VPK-402 coagulant for the removal of suspended solids of different origin and dispersiveness from water

Summary

The coagulation ability of VPK-402 organic coagulant in reducing water turbidity determined by fine mineral particles of different origin and dispersiveness is considered. Water coagulation was carried out under laboratory conditions following the pattern: mixing-flocculation-sedimentation. The concentration of suspended solids in water was determined from turbidity; dispersivenes – from particle hydraulic size U0. The studies were carried out with modeling water with turbidity less than 115 mg/l containing mainly fine-dispersed suspension of bentonite clays, kaolin, quartz, calcium carbonate and titanium dioxide with less than 0.2 mm/s hydraulic size. It was found that the hydraulic size of clay suspensions was determined by their swelling capacity in water; whereas for quartz, calcium carbonate and titanium dioxide suspension – by the particle size distribution of the original minerals. The optimal dosage of VPK-402 for clay mineral coagulation does not depend on their dispersive characteristics and equals to 0.5 mg/l, i. e. 5–10 times higher than the coagulant dosages for modeling waters with finely dispersed particles of quartz, titanium dioxide or calcium carbonate. The efficiency of water clarification lowers with the increase of the percentage of particles with less than 0.05 mm/s hydraulic size irrespective of their origin. The results of the Kuban River water purification validated the obtained regularities. The efficiency of using VPK-402 organic coagulant for reducing water turbidity depending on the origin and dispersiveness (hydraulic size) of suspended solids represented by bentonite clay, kaolin, quartz, calcium carbonate and titanium dioxide particles is considered. The obtained results can be used in practice for optimization of water coagulation to remove suspended solids.

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vstmag engfree 200x100 2

mvkniipr ru

Российская ассоциация водоснабжения и водоотведения

Конференция итог

ecw20 200 300

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