The experience of introducing dynamic clarifiers in natural and wastewater treatment

Summary

The experience of introducing the technology of purifying natural and wastewater to the regulated quality parameters in dynamic clarifiers and dual-media mechanical filters is presented. The technology and related equipment have been developed by the experts of CJSC NPE «United Water Technologies» (Moscow). Dynamic clarifier is the result of upgrading
traditional filters with floating filter media and contact clarifiers. Upgrading included improving upper and bottom drainage distribution devices, and using granulated floating inert filter media (3–5 mm grain size, density 0.8–0.9 g/cm3) based on polymer materials (polyethylene, polypropylene etc) which was characterized by high mechanical strength and, respectively, by long lifetime. The process flow scheme of the Novokuznetsk aluminium smelter (RUSAL Company) wastewater treatment is considered. Industrial effluent of the plant is recycling and used in cooling the basic process equipment as well in manufacturing products and chemicals. In order to further promote the technology of dynamic clarification the dynamic clarification filter was patented. It is a dual-chamber apparatus consisting of an upper primary treatment chamber and a bottom fine treatment chamber. The principle of operation is in preliminary dosing coagulant and flocculant into incoming water and upward water flow filtering through the primary treatment chamber with INERT® floating inter filter media (3–5 mm grain size), and further filtering through the fine treatment chamber with coarse-grained hydro-anthracite (1.2–2.5 mm grain size) (upper layer) and fine grained (0.6–1.2 mm) quartz sand (bottom layer). The first results of introducing dynamic water clarification prove that it is more efficient and cost-effective compared to the traditional technologies of natural and wastewater treatment.

Key words

wastewater , surface water , dynamic clarification filter , dynamic clarifier , mechanical filter , pressure contact tank , inert filter media

The experience of introducing DYСLAR dynamic clarification technology in natural and wastewater treatment

Summary

The experience of introducing innovative home dynamic clarification technology on the basis of dynamic clarifiers and dynamic clarifying filters in natural and wastewater treatment is described. The technology and relative equipment have been developed by the specialists of «Integrated Water Technologies» Company (Moscow). The principle of the dynamic clarifier operation is based on the technology of contact coagulation in a pressure filter with floating media. The specific feature of the dynamic clarifier is the availability of improved upper and lower drain-distributing devices and also granulated INERT media manufactured on the basis of polymer materials and characterized by high mechanical strength and, consequently, long lifetime. By the example of the Novokuznetsk aluminum smelter the results of industrial and storm wastewater treatment with the use of clarified effluent in the in-plant recirculation system are presented. By the example of a petrochemical plant (Pavlodar city, Kazakhstan) the experience of introducing a dynamic clarifying filter that combines in one apparatus the functions of a dynamic clarifier and a mechanical filter with heavy granular media is described. The advantages of using aluminium polyoxychloride as a coagulant compared with aluminium sulfate for DYСLAR technology are presented. The experience of introducing the given technology of water clarification confirms its undeniable advantages compared to the foreign prototypes and allows designating it as best available technologies.

Key words

wastewater , surface water , dynamic clarification filter , dynamic clarifier , mechanical filter , pressure contact tank , inert filter media , DYСLAR water dynamic clarification technology , double-layer media