Recycling and standard-reaching treatment method for rural domestic sewage

Abstract

The invention belongs to the field of sewage treatment, and relates to a recycling and standard-reaching treatment method for rural domestic sewage, which is carried out in a sewage treatment system comprising an anaerobic digestion tank, a reuse tank, a grid sedimentation tank, an adjusting tank, a variable process biochemical tank, a sedimentation tank and a variable process ecological filter bed. The method comprises the following steps: S1, when the liquid level of black water in the anaerobic digestion tank is lower than an overflow limit liquid level, operating in a quality-divided treatment mode, recycling the black water as an efficient liquid fertilizer after anaerobic digestion, and discharging grey water after reaching the standard after treatment; and S2, when the resource reuse demand of the black water is reduced, continuously raising the liquid level of the black water in the anaerobic digestion tank to the limit liquid level of overflow, merging the black water into a grey water treatment system, and switching to a merging treatment mode. According to the invention, cyclic utilization of nitrogen, phosphorus and potassium resources of rural domestic sewage is preferentially realized on site, the conventional sewage treatment mode of nitrogen and phosphorus removal is thoroughly changed, cyclic utilization of resources can be truly realized, and the sewage treatment cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for resourceful and up-to-standard treatment of domestic sewage in villages and towns. Background technique [0002] Domestic sewage in villages and towns mainly includes black water and gray water. Among them, black water refers to the effluent of septic tanks. The content of nitrogen, phosphorus and potassium in black water is very high. It is difficult and costly to treat nitrogen and phosphorus pollutants to meet the discharge standards, and it causes a great waste of resources. Gray water is a general term for domestic miscellaneous water, including but not limited to bathroom drainage, kitchen drainage, laundry table drainage, sink drainage, washing machine drainage, garden cleaning drainage and other domestic wastewater other than septic tank effluent. The concentration of pollutants such as phosphorus is low, causing less pollution to the environment,...

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Problems solved by technology

However, although this traditional treatment mode can effectively remove pollutants such as organic matter and nitrogen and phosphorus nutrients from sewage, it has the disadvantages of high energy consumption, high cost, and by-products such as residual sludge that are likely to cause secondary pollution to the environment. Secondary pollution and the irreversible loss of resources such as carbon, nitrogen, phosphorus, and potassium. From the perspective of the whole life cycle of the sewage treatment system, the cost of pollution control is very high, which will bring a great burden to the environment.

With the full popularization of high-speed rail in my country, vacuum toilets on high-speed rail are gradually moving towards the field of sewage treatment. At present, many scientific research institutes and environmental protection companies have developed negative pressure collection systems or equipment for feces and even sewage and applied them The field of sewage treatment, including village and town sewage, has exerted efficiency and effects that traditional gravity collection pipe networks do not have, but there are many realities in the negative pressure collection system, such as a large number of equipment, high manufacturing and installation requirements, high follow-up operation and maintenance intensity, and high management costs. Problems have severely limited the popularization and application of this technology

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