Small integrated rural sewage Water treatment equipment Domestic wastewater
Process characteristics
1. Buried integrated domestic sewage treatment equipment has a history of more than 10 years of application. The equipment has been put on the market for many years and has been running steadily, which can ensure that it is not bad or corrupt after more than 15 years of use.
2. The characteristics of underground integrated domestic sewage treatment equipment are as follows:
(1) . A/O biological contact oxidation process is selected as the main process, and elastic solid is set in the A-level pool filler The three-dimensional columnar elastic filler is set in the O level tank, which has large specific surface area, high microbial activity, rapid removal of organic pollutants, and good denitrification effect. The specific surface area of filler is 16-20 times that of general solid filler, which shortens the biochemical time and greatly reduces the floor area.
(2) The equipment can be buried underground: it does not occupy the surface area, does not need to build a house and keep warm, and the surface greening is used as a parking lot.
(3) Low noise will not affect the surrounding environment.
Small integrated rural sewage treatment equipment Domestic wastewater Process introduction
Hydrolysis acidification tank
Due to the high organic composition in the sewage and good biodegradability of BOD5/CODcr=0.3, the design adopts the biofilm method.
Because the organic nitrogen content in the sewage is high, it will appear in the form of ammonia nitrogen during biodegradation, so the index of ammonia nitrogen discharged into the water will rise, and ammonia nitrogen is also a pollution control index. Therefore, an anoxic tank is added in front of the contact oxidation tank. The anoxic tank can use the * * * salt brought in by the reflux mixture and the organic carbon source in the influent to denitrify, so that NO2 - NO3 - is reduced to N2 to achieve denitrification, and the ammonia nitrogen value is degraded while the organic matter is removed.
Contact oxidation tank
After being treated in the anoxic tank, the sewage flows automatically into the contact oxidation tank, thus entering the contact oxidation stage, i.e., entering the aerobic treatment.
The contact oxidation tank is a biological treatment device with biofilm method as the main method and activated sludge as well. By providing oxygen source, the organic matter in the sewage is adsorbed and degraded by microorganisms to purify the water quality.
Small integrated rural sewage treatment equipment Domestic wastewater working principle
The removal of organic pollutants and ammonia nitrogen by integrated sewage treatment equipment mainly depends on the AO biological treatment process in the equipment. The working principle is at Level A. Because of the high concentration of organic matter in the sewage, the microorganism is in a state of gas deficiency. At this time, the microorganism is a facultative microorganism, which converts and decomposes the organic ammonia in the sewage into NH3-N. At the same time, the organic carbon is used as an electronic donor to convert NO - 2-N and NO - 3-N into N2. In addition, some organic carbon sources and NH3-N are also used to synthesize new cell substances. Therefore, Class A tank not only has a certain organic matter removal function, reduces the organic load of the subsequent aerobic tank, but also facilitates the nitrification. It also relies on the high concentration of organic matter in the raw water to complete the denitrification and ultimately eliminate nitrogen eutrophication pollution.
At Grade O, the concentration of organic matter has been greatly reduced, but a certain amount of organic matter and higher NH3-N still exist. In order to further oxidize and decompose the organic matter, and at the same time, nitrification can be carried out smoothly when the carbonization is completed, aerobic biological contact oxidation tank with lower organic load is set at Level O. There are mainly aerobic microorganisms and aerobic bacteria (nitrifying bacteria) in the O tank. Aerobic microorganism decomposes organic matter into CO2 and H2O; Autotrophic bacteria (nitrifying bacteria) use inorganic carbon generated from organic matter decomposition or CO2 in the air as the nutrient source to convert NH 3-N in sewage into N 2-ON, N 3-ON, and the effluent from the O level pool returns to the A level pool to provide electronic receptors for the A level pool, and finally eliminate nitrogen pollution through denitrification.
Small integrated rural sewage treatment equipment Domestic wastewater Pay attention to the operation and management of sewage treatment facilities. Check the operation records of anaerobic tank, aerobic tank, sedimentation tank and other equipment, and check whether the built sewage treatment plant is "built without operation" or "insufficient operation"; Analyze whether there is redundancy in the treatment capacity of the sewage treatment plant that does not reach the design treatment capacity, and whether the operation load rate is insufficient due to imperfect pipe network construction; Cooperate with Environmental Protection Department door Check whether the WWTP has installed online monitoring equipment for main water quality indicators as required, whether the equipment operates well, whether the data measurement is accurate, and whether the effluent quality meets the standard; Follow up and investigate whether the sludge treatment process is standardized, whether the sludge treatment is up to standard, and whether there is secondary pollution caused by secretly discharging sludge.
