Small buried domestic sewage in villages and towns Water treatment equipment device
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.
Small buried domestic sewage treatment equipment in villages and towns 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.
Small buried domestic sewage treatment equipment in villages and towns 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.
Small buried domestic sewage treatment equipment in villages and towns 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.
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.
Installed in both Class A and Class O biochemical tanks filler 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;
"To promote the construction of demonstration villages for rural domestic sewage treatment in a down-to-earth manner is the first time that the relevant provincial departments door One of the practical matters of people's livelihood is also an important part of promoting the provincial rural domestic sewage treatment work from point to area. In the actual governance, Guangdong selected the treatment facilities and processes that are more suitable for the local area and promoted them by classification in combination with the village location, population size, industrial location and other factors. " The relevant person in charge of the Provincial Department of Ecology and Environment said that since the theme education was launched, Guangdong has insisted on testing the achievements of rural domestic sewage treatment in promoting development, and has continuously implemented various measures, such as the introduction of the Accreditation Standards for Rural Domestic Sewage Treatment in Guangdong Province (Trial) and the Technical Guidelines for Resource Utilization of Rural Domestic Sewage in Guangdong Province (Trial), Select and establish governance models and technical processes suitable for different types of villages and water bodies.
