Rural domestic wastewater treatment system based on small watershed morphology

Abstract

The invention relates to the technical field of rural domestic sewage treatment, particularly to a rural domestic wastewater treatment system based on small watershed dispersity. According to the present invention, the rural domestic wastewater treatment process using the improved three-grid septic tank-oxidation pond-ecological ditch as the main body is constructed based on local conditions by completely considering the ditches formed by the abundant rainfall and the mountainous hilly terrain in the vast rural areas of southern China, the energy-consuming equipment such as pumps and the likeare not required to be additionally arranged, the additional power-free requirement is achieved, and the rural domestic wastewater treatment system has advantages of less investment, good effect, convenient operation and maintenance, no secondary pollution and the like, and the final effluent can achieve the Class V standard of Environmental Quality Standards For Surface Water (GB3838-2002).

Description

technical field [0001] The invention relates to the technical field of domestic sewage treatment, in particular to a distributed rural domestic sewage treatment system based on small watersheds. Background technique [0002] Rural domestic sewage mainly comes from the daily production and life of residents, including septic tank wastewater, kitchen sewage, cleaning water, as well as sewage from field fertilizers and pesticides, and livestock breeding. In addition to a large amount of organic matter, there are bacteria, viruses, residual pesticides and antibiotics, etc., and the composition of pollutants is relatively complex. At present, there are mainly the following problems in rural domestic sewage treatment: 1. Due to the imperfect construction of rural domestic sewage drainage pipe network, and the scattered pollution sources, it is difficult to collect sewage, so it is difficult to achieve large-scale intensive treatment; 2. The conventional sewage treatment system has...

AI Technical Summary

Problems solved by technology

In addition to a large amount of organic matter, there are also bacteria, viruses, residual pesticides and antibiotics, etc., and the pollutant components are relatively complex

At present, there are mainly the following problems in rural domestic sewage treatment: 1. Due to the imperfect construction of rural domestic sewage drainage pipe network, and the scattered pollution sources, it is difficult to collect sewage, so it is difficult to achieve large-scale intensive treatment; 2. The conventional sewage treatment system has complex processes and automation The degree of operation and maintenance is relatively high, so it is not suitable for the relatively low level of rural technology; 3. The investment and operation costs of conventional sewage treatment processes are relatively high, and rural domestic sewage treatment often finds it difficult to continue to operate after the facilities are completed. Situation; 4. The nitrogen and phosphorus content and organic load in sewage are high, and due to rural non-point source pollution, there are residual pesticides, antibiotics and other biologically toxic substances in sewage, which have an impact on the stable and efficient operation of the biochemical treatment system

Although there are a variety of three-format septic tanks in the prior art, such as tempered glass structures and integrally formed structures, these types of septic tanks are expensive and are not currently applicable in rural areas and do not have wide practicability

At present, most of the septic tanks that are common in rural areas still use mortar to pour and sinter ordinary brick structures, but such septic tanks have serious water seepage, which will pollute the surrounding and downstream groundwater

[0005] 2. Constructed wetland treatment, this technology has limited removal capacity, and there are problems such as mosquitoes and flies on the surface of the wetland in summer, and the odor is scattered.

[0006] 3. Land infiltration technology, which may have problems such as poor off-single effect, unstable operation, and easy blockage of soil voids

[0007] At present, the collection, treatment and discharge of scattered sewage or non-point source sewage are usually only initially realized, and the treatment and utilization have not been realized, that is, on-site treatment, on-site reuse, and resource utilization of sewage.

[0008] In addition, in the southern rural areas of our country, due to the terrain and abundant surplus, relatively common small water bodies or small watersheds will be formed in the vast rural areas, but the artificial utilization rate of a large number of ditches is relatively low, basically It only maintains its own natural attributes, and even many of them have become storage places for black water or smelly water, seriously affecting the surrounding ecological environment

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