The ESMIL Industrial Group took part in reconstructing the first stage of biological wastewater treatment facilities on the left-bank treatment plant in Kemerovo, Russia.
The first stage of the treatment facilities lasted for 50 years and stopped being used because of an emergency condition. In 2014 the decision to reconstruct the line with the introduction of nitrogen and phosphorus deep-removing technologies was accepted. During 3-5 years the employees of wastewater treatment plant and contractors put in order all electrical systems of the line; and additionally, technological and pumping equipment was mounted: sludge scraper complex and trays for the secondary clarifiers, stirrers and aeration systems in aeration tanks. Reinforced concrete constructions of the secondary clarifiers, sludge chambers, wells, dumping chambers and aeration tanks sections were recovered.
Under this project, the ESMIL Industrial Group acted as a supplier of technological equipment, among which were the:
- sludge scrapper complexes for the radial secondary clarifiers (IRVO);
- tubular polymeric aerators (АPVK).
Equipment for the secondary clarifiers is made from stainless steel AISI304 and aluminium alloys with the use of polymeric materials. This provides a long period of trouble-free operation. The special construction of the suction scrappers provides a complete removal of sludge from the bottom of the clarifiers, and the special construction of the drive unit excludes a wheel slip during the winter season when the clarifier side becomes covered with ice.
The even air distribution achieved by ESMIL diffusers has excluded the formation of stagnant zones. It also succeeded to increase the activity of micro-organisms due to the high saturation of sludge with air, owing to the small bubble size of 2-3 mm. The ESMIL aeration system became an excellent decision for designing of this wastewater treatment plant as it has also allowed the reduction of capital costs of reconstruction. The cost of equipment was in 2,5 times lower than the other types of air diffusers with the warranty period of 8 years.
The reconstruction allowed the increase in the capacity of the wastewater treatment plant up to 175 thousand m3/day as well as to improve the quality of treatment by key parameters and meet the outlet quality requirements.
