DOI 10.35776/VST.2022.03.05
UDC 628.355
Kevbrina M. V., Gavrilov Dmitrii, Belov N. A., Agarev Anton
The effect of the operation of secondary settling tanks on the efficiency of biological removal of nitrogen through the example of Kuryanovskie wastewater treatment facilities
Summary
«Mosvodokanal» JSC conducted an industrial-scale experiment with the secondary settling tanks of the new section of the Kuryanovskie wastewater treatment facilities in Moscow in order to determine the effect of the operation of settling tanks on the efficiency of biological removal of nitrites. With an increase in the level of sludge stand in the secondary settling tanks, conditions arise in the sludge layer at the bottom of the settler for the anaerobic processes that cause the lysis of activated sludge cells. Under these conditions, a sufficient amount of organic matter is generated in the sludge layer, both residual, occluded on sludge flocks, and formed during the lysis of part of the cells, so that in the presence of nitrates, the process of incomplete denitrification starts with the formation of nitrites. The occurrence of anaerobic processes in the bottom sludge layer in the secondary settling tanks is also affected by the oxygen concentration in the mixed liquor entering the secondary settling tanks. The process parameters of the operation of the facilities that prevent a decrease in the quality of effluent are determined: regulating the operation of secondary settling tanks depending on the load and residence time of the sludge dry matter that prevents the sludge from long staying in the bottom layer, as well as maintaining a high oxygen concentration at the end part of the aeration tanks.
Key words
wastewater , biological treatment , sludge disposal truck , secondary settling tank , activated sludge , nitrite nitrogen
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UDC 628.32/.35
Meshengisser Yu. M., Fomin I. I., Belen’kii Gleb
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
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UDC 628.33
Kevbrina M. V., Bogomolov M. V., Streltsov S. A., Belov N. A., Kolbasov G. A.
Optimization of the mode of sludge removal from secondary settling tanks
Summary
In the process of upgrading the Moscow Novokur’ianovskie wastewater treatment facilities the scraper mechanism for activated sludge collection in 54 m diameter secondary settling tanks was replaced by SO-54 sludge sucker. Since it was the first experience of using sludge suckers at the Kur’ianovskie wastewater treatment facilities it was decided to carry out experimental tests of the operation of the secondary settling tanks equipped with sludge suckers as well as to develop and approbate the method of efficient activated sludge collection and removal from the bottom of the settling tanks. The operation of SO-54 sludge sucker in different modes was analyzed. It was shown that the design of the settling tank provided for the operation control by switching off and on the suction pipes of the upper level of the sludge suckers, i. e. eliminating the use of complicated instruments. Regulating the operation of the suction pipes of the upper level of the sludge suckers with a time switch provides for maintaining the optimal height of the activated sludge layer. Switching off the suction pipes of the upper level of the sludge suckers results in the increased concentration of recycle sludge. As a result of changing SO-54 sludge pump operation the dosage of recycle sludge was increased from 4.6 to 7.1 g/l eliminating the effluent quality in relation to suspended solids. This allowed reducing the recycle sludge volume subject to pumping to the aeration tanks, and reducing the number of operating pumps, and power saving.
Key words
treatment facilities , sludge disposal truck , secondary settling tank , activated sludge , power saving
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DOI 10.35776/VST.2022.06.01
UDC 628.35
Smirnov Aleksandr Vladimirovich, Babichev Aleksandr, Fediunin Viacheslav, Fediunin Viacheslav
Improving the environmental safety of the Urals: upgrading the Southern Wastewater Treatment Plant in Yekaterinburg
Summary
The Ural region has been traditionally considered the «backbone» of Russia with the center in Yekaterinburg. The environmental safety of the region is largely ensured by wastewater treatment at the Northern and Southern municipal wastewater treatment plants. The current upgrade of the Southern Wastewater Treatment Plant has become the biggest over the past 7 years: 345 million rubles have already been invested in the building, installation works and equipment. In 2022, the allocated finance will be another 120 million rubles. In the process of reconstruction and modernization of the Southern Wastewater Treatment Plant the mechanical sludge dewatering facilities were subject to upgrade resulting in the double reduction of the generated wastes. More than 70% of aeration tanks (8 of 11 sections) were reconstructed with a complete replacement of the aeration system, and secondary clarifiers were reconstructed with the replacement of sludge sucker (6 of 15 tanks). In general, the upgrade of the biological treatment facilities provided for increasing the environmental performance and improving the state of the ecosystem of the Iset River.
Key words
wastewater treatment , modernization , sludge disposal truck , aeration tank , secondary settling tank , aeration system
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UDC 628.31.004.69
Streltsov S. A., Belov N. A., Klimova L. A., Pshenko N. L.
Reconstruction of the Novo-Kur’ianovo wastewater treatment facilities
Summary
The Kur’ianovo wastewater treatment facilities are the European biggest municipal wastewater treatment complex. Being an advanced project for its time (1970-ies) by the XXI century the Kur’ianovo wastewater treatment facilities turned to be obsolescent and needed upgrading. In 2010 the project of upgrading the first and second blocks of the Novo-Kur’ianovo wastewater treatment facilities was launched. The specific features of the design solutions of recovering the capacity of the engineering structures of buildings and facilities of the wastewater treatment plant, of retrofitting nutrients removal process are considered alongside with the aspects of reducing malodorous emissions from the open surfaces of the facilities. Special attention in the project is paid to the selection of process equipment – advanced sludge scrapers, sludge pumps, turboblowers and aeration systems were installed. For the first time floating covers of the primary settling tanks were applied.
Key words
sedimentation tank , aeration , wastewater treatment , sludge disposal truck , sludge scraper , nitrification-denitrification , dephosphatization , aeration tank , acidoficator , malodorous emissions removal , floating cover
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УДК 628.32/.336
Zhurba M. S., Fomin I. I., Levchenko O. V.
Development of high-technology wastewater treatment facilities on the basis of «Ecopolymer» equipment
Summary
«Ecopolymer» Manufacturing Company LLC has lately expanded both the production capacities and production portfolio. The Company is aiming at producing not just separate product types but complexes designed for complete cycle of process operations. The Company production program is presented. The designs of a belt filter-press, rack screens for fine treatment, a screw conveyor and a screw press for screenings, and a sludge pump are described. The basic specifications and advantages of the equipment manufactured by «Ecopolymer» Manufacturing Company LLC are summarized. The development and manufacture by the «Ecopolymer» production department of the control cabinets for the automation of the operation of the entire treatment facilities or their separate units has become a solid step in the control of the treatment facilities as a whole. The long-term Company’s experience provides for offering the customers ready-made solutions of the manufactured equipment layout with the visualization of the layout and harmonization of all the automated control systems for the equipment included into the complex.
Key words
sedimentation tank , sludge disposal truck , filter-press , manufacturing facilities , sludge mechanical dewatering , screw conveyor , mechanical screens
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