Advanced developments of Ecopolymer plant for wastewater treatment facilities

Summary

Ecopolymer company is well known in the market as a manufacturer of aeration systems. Over the past five years the company has expanded the product range adding a metal product line, upgraded production by installing advanced intelligent machines, and increased the staff of the design engineering bureau. The article describes the equipment, the production of which has been mastered over the past five years. The company strives to produce not individual types of products, but equipment packages designed to carry out a full cycle of process operations supported by the proprietary control systems. To date, the production facilities provide for the release of a full range of equipment for mechanical wastewater treatment – coarse and fine screens, conveyors and thickening presses for screenings, sand separators, grinders, etc. Particularly noteworthy is the innovative system for collecting floating substances in primary settling tanks in combination with the traditional scraper system. The produced sludge pumping systems have no rival among domestic manufacturers. Also, in addition to the well-known aeration systems, Ecopolymer Trade and Production Enterprise has developed AQUA-TOP 500, a new aeration system with a working capacity of 20–25 m³/h, that is equivalent to four 9” aerators.

Key words

sludge disposal truck , sludge scraper , sewerage treatment facilities , screens , aeration system , production , sand separator

The past and future of the domestic aerator engineering (on the occasion of the 25th anniversary of the first RF Patent «Tube aerator»)

Summary

The stages of development of the domestic production and use of aeration systems in wastewater treatment – from traditional perforated pipes to high efficient aeration systems are described. The drawbacks and advantages of aerators, their applicability under certain conditions are designated. In the years ahead the development of not just aerators is planned but of aeration systems that include the entire equipment set for saturating water with oxygen: regulated air blowers, delivering and distributing pipelines with shutoff and control valves, comprehensive automated air supply control systems, aerators, systems of quick-detachable fittings and other elements that provide for optimal supplying air to the aeration tanks and if necessary for easily changing the system configuration in the process of retechnologisation of the treatment facilities.

Key words

biological treatment , activated sludge , aerator , aeration system , air-lift effect

The efficiency of aeration systems at the Moscow wastewater treatment facilities under field operating conditions

Summary

Aeration systems of aeration tanks are key elements of the wastewater treatment facilities. The main task in operating different types of aeration systems is ensuring high efficient atmospheric oxygen utilization at low energy consumption. The specialists of R&D Centre of «Mosvodokanal» JSC investigated the results of the long-term operation of the aeration systems at the Moscow wastewater treatment facilities under field operating conditions. The dependence of the aeration system efficiency on the ratio of surface areas of aerated zone and aeration tank; the air flow rate through one aerator at different options of aerators layout along the aeration tank length was studied. Regulating specific air consumption in the aeration tank zones provides for the optimal use of the available oxidation potential of the facilities without increasing aeration expenses or decreasing the efficiency of wastewater treatment. It was stated that when designing and choosing aeration systems it is necessary to find a balance between the surface area of the aerated zone in the aeration tank and efficiency of the aeration system. It was shown that when introducing nitrification-denitrification technologies without increasing capital and operating expenses for purchasing and maintaining mixing and aeration equipment both short-term and long-term shutdown of the aerators is possible to provide for alternate aeration without any efficiency loss. Perennial studies of the aeration systems produced by different manufacturers showed that the efficiency of the aeration systems during long-term operation is reduced by 25% of the design value. Therefore when choosing and designing an aeration system the reduction of the aeration system efficiency during the operation at the existing treatment facilities shall be taken into account aside from the required number of aerators and their layout.

Summary

wastewater , biological treatment , aeration tank , activated sludge , aeration system , efficiency of oxygen transfer