Investigating an advanced method of surface runoff treatment in the city of Sochi

Summary

The results of investigating storm water treatment technologies under the conditions of Sochi are presented. A pilot treatment plant is described, the operation of the basic units – lamella settler and filters – is considered. The kinetics of surface runoff suspended solids sedimentation is investigated. The performance characteristics of the lamella module during chemical sedimentation: downward clarified water flow rate in cavities, upward flow in plate spacing, and water surface loading were determined. The efficiency of using fibrous filter for storm water treatment was theoretically substantiated and studied. The service adhesive capacity of the filter was determined. The methods of the treatment unit regeneration are suggested.

Key words

suspended substances , oil products , sorption , flocculant , regeneration , lamella settler , flow rate , fibrous filter , adhesive capacity

Improving the energy efficiency of UV water disinfection systems

Symmary

The performance of a number of ultraviolet water disinfection systems available on the market is analyzed in comparison with systems of the maximum capacity reached as a result of theoretical studies, at the same energy consumption. It is demonstrated that the maximum performance values declared by the system manufacturers are 1.1–2 times less than could be obtained for the same designs, provided the irradiation uniformity of the treated flow is ensured. A technical solution is proposed that provides for the uniform exposure due to the flow velocity distribution that decreases with the distance from the lamp in proportion to a decrease in the average irradiation intensity along the length of the lamp. This solution allows approaching significantly the maximum design performance with the minimal cost and minor changes in the design. The distribution of treated water flows in a system with diaphragms-spreaders that ensure the required flow direction, is investigated. It is demonstrated that for a reactor vessel up to 50 cm long one diaphragm is enough, whereas for larger vessels installing additional flow spreaders can solve the problem. Possible use of the proposed solution for any systems with a longitudinal flow relative to the location of the UV lamps is shown.

Key words

ultraviolet , water disinfection , flow rate , irradiation dose , UV-lamp , flow spreader

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