Efficiency Factors

Reliability of technological modes is achieved due to application of low-pressure pumps as the main equipment, as well as the long-preservation of biomass vital functions within biofilters. Therefore, active sludge is soon recovered within aero tanks after stoppage of work.
High cleaning effect: the impossibility of untreated wastewater "breakthrough" (The initial sewage first mix with sludge in the mixing chamber in proportion of 1:3-1:10, then come into contact with biofilters’ biocoenosis. After that it is evenly distributed in aeration area and finally it gets filtered through a layer of floating sludge in sedimentation areas). Provided that impurity level in CW at a single-step purification scheme decreases BOD and suspended solids from 100-700 mg/l to 5-10 mg/liter. CW operation in full oxidation mode, nitrifier and denitrifier bacteria biofilters availability in adherent micro flora layer ensures the developed process of removing nitrogen impurities. MPC in fishery waters is achieved while adding supplementary facilities for denitrification and dephosphorization to technological schemes.
CW availability in technological purification schemes of concentrated and highly concentrated wastewater can reduce the negative impact of hydrogen sulphide, hydrosulphide and low pH levels on the aerobic treatment processes.
Reducing energy consumption by 2-3 times: the energy consumed by low-pressure pumps is used for biofilters’ operation, active sludge enrichment with oxygen in biofilters and water jet aerators (efficiency coefficient of combined method of aeration is 0,8-0,85), and mixing the contents of aeropacks. Specific power consumption for municipal wastewater treatment is 0,18-0,25 kVt/m³, whereas in the existing aeration facilities power consumption of the blowers, mixers and pumps comes to 0,4-0,5 kVt/m³. Meanwhile the level of nitrogen-containing impurities biodegradation is higher and power consumption for used air processing is 3-4 times lower due to reducing its quantity. While concentrated and highly concentrated wastewater treatment power consumption at aerobic stages of treatment is reduced by 2-3 times.
Optimization of biochemical treatment temperature condition. Maximum aerial oxygen utilization (up to 20% of the total) due to its repeated circulation through the biofilter and aeropack reduces the amount of external air for the biochemical processes to 3-5 times. The temperature of CW treated liquid in cold time of year increases by 1-2^oC. In the existing aeration facilities this index decreases by 2-9^oC under the outer temperature 5-20^oC below zero, resulting in a slowdown or complete cessation of biochemical purification processes. This principle allows the use of CW in countries with hot climate, because treated liquid heating reduces.
Reduction of health protection zones: CW sealed design with the used air treatment provides clean operation mode. That is why CWs may be located directly within residential districts (biological purification station in village Abrau-Dyurso is located at a 30 m distance from comfortable cottages and 16 m from a sanitary complex. Wastewater treatment plants of the cities of Volsk, Kineshma equipped with used air purification installations are located at a distance of 100 m away from a dwelling zone.
Number of staff reduction: reliability of technological processes of purification, minimum quantity of electromechanical equipment and complete automation of work can reduce the number of staff by 50-70%.
Reduction of site area: location of biofilters above the aeration tanks, as well as aeration tanks, sedimentation tanks, utility space and back office location blocking can reduce site area to 3 times.