Small domestic sewage Water treatment equipment The village is easy to use
Selection of domestic sewage treatment equipment
According to the above water quantity and quality, we must follow the following ideas when considering the selection of sewage treatment process: 1. The general idea is to use a mature and reliable A/O biological contact oxidation process as the treatment process, supplemented by physical and chemical treatment means such as grid interception, sedimentation tank clarification, disinfectant disinfection, etc;
Firstly, the sewage is pretreated by intercepting it with a mechanical grid, in order to initially reduce the content of inorganic particles and improve the identity and biodegradability of the sewage; Then, through the anoxic aerobic A/O biological contact oxidation method, the organic pollutants are first converted into ammonia nitrogen by using the role of biofilm, and at the same time, both organics and ammonia nitrogen are removed through the aerobic nitrification and anoxic denitrification processes. Biochemical tank is equipped with new high-density elastic solid filler The filler has the advantages of high load, simple construction, small volume, stable and reliable operation, convenient management, convenient maintenance and replacement, etc; The effluent from the biochemical tank enters the horizontal flow sedimentation tank for solid-liquid separation. The horizontal flow sedimentation tank is characterized by good solid-liquid separation effect, low investment, strong adaptability to temperature changes, simple construction, etc; The effluent from the horizontal sedimentation tank enters the disinfection tank for disinfection treatment, which can ensure that all indicators of the treated sewage reach the standard.
Small domestic sewage treatment equipment is easy to use in villages Sewage treatment process
After the above process comparison, the main process design of the sewage is as follows: the domestic sewage is directly discharged into the regulating tank after being blocked by the mechanical grid. The purpose of setting the regulating tank is to regulate the quantity and quality of sewage. In order to prevent suspended solids from settling in the regulating tank, perforated aeration pipes are arranged at the bottom of the regulating tank, and gap aeration is used.
The organic composition of the sewage in this project is high, BOD5/CODcr=0.5, and the biodegradability is good. Therefore, it is economical to use biological treatment methods to significantly reduce the organic content in the sewage. Due to the high content of ammonia nitrogen and organic matter in sewage, especially organic nitrogen, when the organic matter is biodegraded, the organic nitrogen will appear in the form of ammonia nitrogen, and ammonia nitrogen is also an important pollution control indicator. Therefore, the anoxic aerobic A/O biological contact oxidation process is used for sewage treatment, that is, the biochemical tank needs to be divided into two parts, A tank and O tank. The sewage in the regulating tank is lifted by sewage pump Lift to Aji biochemical tank for biochemical treatment. In the A-level pool, due to the high concentration of organic matter in the sewage, the microorganism is in a state of hypoxia. At this time, the microorganism is a facultative microorganism, which converts the organic nitrogen in the sewage into ammonia nitrogen. At the same time, the organic carbon source is used as the electronic donor to convert NO2-N, NO3-N into N2, and some organic carbon sources and ammonia nitrogen are also used to synthesize new cell substances. Therefore, tank A not only has a certain organic matter removal function to reduce the organic load of the subsequent O level biochemical tank to facilitate nitrification, but also relies on the high concentration of organic matter in the sewage to complete denitrification and ultimately eliminate nitrogen eutrophication pollution. After the biochemical action of tank A, there is still a certain amount of organic matter and higher nitrogen and ammonia in the sewage. In order to further oxidize and decompose the organic matter, and at the same time, when the carbonization tends to be complete, the nitrification can be carried out smoothly, the O level biochemical tank is specially set.
Small domestic sewage treatment equipment is easy to use in villages Effluent from pool A flows automatically into level O tank, and treatment of level O biochemical tank is completed by autotrophic bacteria (nitrifying bacteria), which use inorganic carbon source generated by organic matter decomposition or carbon dioxide in air as nutrient source to convert ammonia nitrogen in sewage into NO2 -- N NO3 -- N. Part of the effluent from Class O tank flows into the sedimentation tank for sedimentation, and the other part flows back to Pool A for internal circulation to achieve the purpose of denitrification. Fillers are installed in both Grade A and Grade O biochemical tanks, and the whole biochemical treatment process depends on a variety of microorganisms attached to the filler. Dissolved oxygen is controlled at about 0.5mg/l in Class A tank; Dissolved oxygen in the O level biochemical tank shall be controlled above 3mg/l, and the gas water ratio shall be 15:1; Part of the effluent from the O level biochemical tank flows back into the A tank, with a return ratio of 2:1; One part flows into the vertical flow sedimentation tank for solid-liquid separation; The effluent from the sedimentation tank after solid-liquid separation enters the disinfection outlet tank, which can be directly discharged after disinfection. The sludge settled in the sedimentation tank is produced by the current domestic advanced pulse air stripping device introduced from Japan by our company, and part of it is lifted to tank A for internal circulation; One part is lifted to sludge thickener;
Small domestic sewage treatment equipment is easy to use in villages "With the sewage treatment station, the toilet at home is not a decoration. This winter, our family can live in the same way as in the building." Near the Spring Festival, Chen Penglong, a villager from Group 3, Longyuan Village, Shuangwan Town, Jinchuan District, used "handicrafts" to easily be launched When the pipe is connected to the sewage pipe network outside the house, not only the water flush toilet is used in the house, but also the troublesome domestic sewage before has a place to go.
