(1) Class A biochemical pool
In order to control the dissolved oxygen in the A-level biochemical tank at about 0.5mg/l, intermittent aeration is adopted in the tank. The A-class biochemical tank is filled with a new type of elastic three-dimensional packing, which has the advantages of not being blocked easily, light weight, large specific surface area, stable treatment effect and convenient maintenance and replacement.
(2) Class O biochemical pool
The A/O biochemical tank is filled with columnar biological carrier filler, and the specific surface area of the filler is 1.6 ~ 20 times (the same unit volume) of the general biological filler, so the biomass in the tank remains high, and the purpose of removing organic pollutants at high speed is achieved. The aeration equipment adopts blower and microporous aerator, and the oxygen utilization rate is above 30%, which effectively saves the operation cost.
(3) Secondary sedimentation tank
After the sewage is treated by the O-class biochemical tank, the water contains a lot of suspended solids (biofilm falls off). In order to make the effluent SS meet the discharge standard, a vertical sedimentation tank was used for solid-liquid separation. There are 1 sedimentation tank, and the surface load is1.0m3/m2.hr. The sludge in the sedimentation tank is lifted to the sludge tank by the blow-off equipment, and at the same time, the sludge can be partially lifted to the A-level biochemical tank for sludge reflux according to the actual water quality, so as to increase the sludge concentration in the O-level biochemical tank and improve the removal efficiency.
(4) Sludge pond
The sludge in the sedimentation tank is lifted by air to the sludge tank for normal temperature nitrification, and the supernatant of the sludge tank is refluxed to the contact oxidation tank for reprocessing. There is little excess sludge after nitrification, so it can be cleaned once every six months. The cleaning method can be that the dung suction truck extends into the bottom of the sludge tank from the inspection hole for suction transportation. Micro-power sewage treatment process-scope of application Integrated sewage treatment equipment is suitable for the treatment and reuse of domestic sewage in residential quarters, villages and towns, office buildings, shopping malls, hotels, restaurants, sanatoriums, institutions, schools, troops, highways, railways, factories, mines and tourist attractions, as well as the treatment and reuse of organic wastewater from slaughtering, aquatic product processing, food and other similar small and medium-sized industries. The quality of sewage treated by this equipment reaches the first-class B standard of the national comprehensive discharge standard for sewage treatment. Micro-power sewage treatment process-integrated sewage treatment equipment has the following characteristics: (1) high efficiency. This process has a high removal effect on organic matter and ammonia nitrogen in wastewater. When the total residence time is more than 54 hours, the effluent after biological denitrification can be coagulated and precipitated, the COD value can be reduced to below 100mg/L, other indicators can meet the discharge standards, and the total nitrogen removal rate is above 70%. (2) The process is simple and economical, and the operation cost is low. In this process, the organic matter in wastewater is used as the carbon source for denitrification without adding expensive carbon sources such as methanol. Especially, after the ammonia distillation tower is equipped with a device to remove fixed ammonia, the ratio of carbon to nitrogen is increased, and the alkalinity produced in the denitrification process correspondingly reduces the alkali consumption required in the nitrification process. (3) High volume load. Because the enhanced biochemistry is adopted in the nitrification stage and the high-concentration sludge membrane technology is adopted in the denitrification stage, the sludge concentration of nitrification and denitrification is effectively improved, and compared with similar processes abroad, it has a higher volume load. (4) The anoxic/aerobic process has strong load impact resistance. When the influent water quality fluctuates greatly or the pollutant concentration is high, the process can maintain normal operation, so the operation management is also very simple. Through the comparison of the above processes, it is not difficult to see that the biological nitrogen removal process itself is nitrogen removal, and at the same time, it also degrades organic substances such as phenol, cyanide and COD. Combined with the characteristics of water quantity and water quality, we adopt anoxic/aerobic (A/O) biological denitrification (internal circulation) process, so that the sewage treatment device can not only meet the requirements of denitrification, but also meet other indicators of discharge standards. Micro-power sewage treatment process-principle of anaerobic biofilter (1), filtration: filler intercepts and filters large particles and suspended substances in the influent; 2) hydrolysis: anaerobic microorganisms can hydrolyze macromolecular insoluble substances into micromolecule soluble substances; 3) absorption: anaerobic microorganisms absorb organic pollutants in water, some of which are used for their own growth and reproduction, and some of which are sealed by U-shaped water in the form of biogas; 4) Denitrification: the effluent contacting the oxidation bed is returned to the anaerobic filter. Denitrifying bacteria in anaerobic microorganisms can use nitrate nitrogen in return water to transform it into nitrogen and remove nitrogen-containing substances in sewage.