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UDC 628.31.004.69
Rublevskaya O. N., Probirsky M. D., Lysova Tat’iana, Malysheva V. V.
The experience of the North wastewater treatment plant development and upgrade
Summary
The 25-year experience of operating and developing the North wastewater treatment plant in Saint-Petersburg is described. The stages of upgrading the wastewater treatment plant are presented: the first stage – complying with the Helsinki Recommendations on Baltic Marine Environment Protection (HELCOM) with regard to elimination of nutrients (nitrogen and phosphorus) from wastewater; the second stage – step-by-step 100% treatment of municipal wastewater from the combined sewage system by 2015 to comply with the HELCOM regulatory guidelines; the third stage – reduction of the volume and utilization of wastewater sludge. The improvement of the wastewater treatment plant provided for the upgrade of the facilities and equipment for wastewater mechanical treatment, sludge disposal, pretreatment of sludge mix before dewatering and other measures.
Key words
wastewater , nitri-denitrification , aeration tank , grate , grit chamber , sludge incineration , air blower , chemical phosphorus removal
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UDC 628.161
Moiseev A. V., Troshkova E. A.
Industrial-scale tests of an injection aeration system at the Velizhan water deironing plant in Tyumen
Summary
Tsurumi submersible jet injectors were suggested for the installation in the channels of the rapid filters of the first process line at the Velizhan water deironing plant operated by Tyumen Vodokanal JSC; for the second process line it was recommended to dismantle the polyethylene pipe aeration system in the deaerator-degasifier and to replace the air blower with advanced economically efficient submersible impeller aerators. The engineering solutions were proved by the industrial-scale tests carried out on-site. The results of the water quality analyses before and after retrofitting the advanced aeration system are presented. The approximate evaluation of the power efficiency and cost saving when using submersible impeller and jet aerators is given.
Key words
deferrization , aeration , rapid filter , power saving , air blower , impeller aerator , jet aerator
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УДК 628.356
Berezin S. E., Ovseichuk B. V., Ustiuzhanin A. V.
Air flow control in wastewater treatment
Summary
Energy consumption for the treatment and transportation of 1 m3 drinking water and wastewater in Russia is several times higher compared to the developed countries; whereas the capital investments are several times lower. This fact determines the advisability of investing into water and wastewater projects with the highest energy saving potential. This potential can be realized through the control of energy intensive units in line with diurnal and seasonal changes in water consumption and amount of wastewater removed. Up to 50% of electrical energy consumed by wastewater management is accounted for air blowers. Adjusting their operation can reduce energy consumption by 35%. Air flow control is an economically efficient measure both in the terms of energy consumption and return on investments in wastewater management. Three main methods of air supply for aeration are considered: throttling with a baffler at the suction nozzle of the air blower; adjusting the shaft speed with a variable-speed drive; adjusting the angle of the air flow attack before and after the impeller with the help of turning vanes installed inside the air blower. For comparison, e. g. in Germany, controlled air blowers are used at 390 wastewater treatment facilities in 145 cities. But in Russia from 297 cities with more than 50 thousand population they are used only at 15–20 wastewater treatment facilities. Instead, low efficient adjustment of sewage pumps in RF is used more often than in energy efficient countries. From global best practices the use of controlled air blowers instead of regular ones was paid off during 2–4 years at numerous facilities.
Key words
wastewater , aeration , pumping station , water supply-sewerage services , frequency-regulated electric drive , air blower
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