Distributed domestic sewage source separation, collection and treatment system capable of locally recycling resources and reducing pollution load and design method thereof

Abstract

The invention belongs to the field of village and town sewage treatment and recycling, and relates to a distributed domestic sewage source separation, collection and treatment system capable of locally recycling resources and reducing the pollution load and design method thereof, which includes a quality-divided collection system and a treatment system; The quality-divided collection system comprises a black water intercepting overflow well, a grey water collection and collection well and a sewage collection pipe network; the treatment system comprises more than one set of distributed black water digestion and recycling system and more than one set of miscellaneous water treatment system, and the black water digestion and recycling system comprises an anaerobic digestion tank and a recycling tank. The miscellaneous water treatment system comprises an adjusting tank, an aerobic tank, a sedimentation tank and a subsurface wetland. Domestic sewage is divided into black water and grey water to be collected respectively, cyclic utilization of nitrogen, phosphorus and potassium resources of rural domestic sewage is preferentially achieved on site, the sewage amount and the pollutant concentration in the sewage are reduced, an existing conventional sewage treatment mode of nitrogen and phosphorus removal is thoroughly changed, cyclic utilization of the resources can be truly achieved,and the sewage treatment cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of sewage treatment in villages and towns, and in particular relates to a collection and treatment system and a design method thereof for decentralized domestic sewage source-based collection, on-site resource utilization, and pollution load reduction. Background technique [0002] Domestic sewage in villages and towns generally refers to septic tank effluent, kitchen drainage, bathroom drainage and domestic washing drainage, etc. Among them, septic tank effluent is also called sewage or black water, which is the drainage with the smallest water volume but the highest concentration of carbon, nitrogen, phosphorus and other pollutants; Kitchen drainage, bathroom drainage and domestic washing drainage are collectively referred to as domestic wastewater. Except kitchen drainage contains a certain amount of oil and salt, other pollutants such as COD, ammonia nitrogen, total nitrogen and total phosphorus are relatively low ...

AI Technical Summary

Problems solved by technology

However, the large fluctuations in water quality and quantity and the imbalance of carbon and nitrogen ratio will eventually be manifested in two aspects: unstable operation of the treatment system and high treatment costs.

In addition, the supporting treatment process of the existing mixed collection mode is mainly to remove nitrogen and phosphorus substances from sewage, which not only requires a large amount of energy, chemicals, manpower and material resources, but also causes waste of nitrogen, phosphorus and potassium resources in sewage. Especially the irreversible loss of phosphorus and potassium is not conducive to the construction of a sustainable new countryside

The application of the city's mature municipal sewage mixed collection and centralized treatment model to villages and towns has caused problems such as large fluctuations in terminal water quality and water volume and unstable operation of the treatment system have become increasingly prominent

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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