Disposal technology of domestic miscellaneous drainage in residential quarters and reclaimed water reuse

Residential quarters are relatively independent areas with one or more functions, including residential quarters in the usual sense, hospitals, tourist resorts, new university towns, and life service areas for expressways. Surveys and studies show that the water directly used for cooking and drinking only accounts for 5% of the total domestic water supply, while the rest is mainly used for domestic miscellaneous water, such as community flushing, green irrigation, air-conditioning water replenishment, ground flushing water, car washing, and water features. wait. These domestic miscellaneous water do not have high water quality requirements, and this water distribution requirement provides the possibility for the reuse of water in the community.

At the same time, compared with the effluent of urban sewage treatment plants, the domestic miscellaneous drainage produced by the residents of the community after washing, bathing, kitchen water and laundry water has relatively simple sources of pollution, relatively clean water quality, and a large amount of water, which does not require high treatment. Technology and treatment costs, it can be used as the preferred source of reclaimed water in the community. Therefore, setting up domestic miscellaneous drainage treatment facilities and reclaimed water reuse systems in qualified communities has dual meanings of environmental protection and energy saving.

1 Selection of treatment process for residential miscellaneous drainage

The treatment of domestic miscellaneous wastewater in residential quarters is developed on the basis of traditional urban sewage treatment processes. At the same time, reclaimed water reuse has high requirements for detergent removal, and the most effective method for detergent removal is biological treatment. At present, the main biological treatment processes of urban sewage are: activated sludge method, biofilm method (biological filter, biological turntable, contact oxidation and biological fluidized bed) and natural treatment method (stabilization pond, land treatment, etc.). Among them, the activated sludge method requires the reclaimed water in the community to have a considerable scale, and the daily sewage treatment capacity of the general community should reach 10,000 tons; while the biofilm method has a wide range of applications due to the convenience of biofilm cultivation and operation management. , At present, the majority of biological contact oxidation methods are used.

The natural treatment method mainly uses natural conditions for sewage treatment and reuse, and the capillary infiltration soil purification system in the land treatment system is more suitable for the reclaimed water in the community. It is an engineering method for purifying sewage by making full use of the physical and chemical properties of animals, microorganisms, plant roots and soil that inhabit the soil. This method can not only treat sewage, but also can be combined with greening to beautify and transform the environment, which has special promotion significance. But it requires more green space or wasteland around the community, which has certain limitations.

In short, the selection of domestic miscellaneous drainage treatment process in the community should be based on the characteristics of the community and its domestic miscellaneous drainage, and the technical and economic comparison of the schemes can be selected. In principle, a treatment process with simple and reasonable process flow and stable treatment effect should be selected.

2. Thoughts on the Implementation of Reclaimed Water Reuse in Residential Areas

As a relatively independent living area, the community not only puts forward requirements for the miscellaneous drainage treatment of the community, but also faces a series of problems that need to be considered in the promotion and operation of the reclaimed water reuse technology in the community.

  1. Pipeline setting problem
    When miscellaneous drainage is used as the source of reclaimed water, two sets of water supply systems and sewer systems must be set up, namely tap water system and reclaimed water system, miscellaneous drainage system and other drainage collection systems, which belong to the complete diversion system. The pipeline is more complicated, the design and construction are more difficult, and the investment is also increased. Therefore, the selection of general residential areas is also limited, and it can only be used in some high-end residential areas or areas where residents are more acceptable to reclaimed water.
    If the reclaimed water system does not enter the room, but is only used outdoors such as greening, ground washing and car washing, the pipeline setting can be greatly simplified, the investment is relatively low, and it is easy for ordinary residents to accept. However, the range of use of reclaimed water is limited, and the use efficiency is reduced.
  2. Price and cost issues
    The investment and operation costs of reclaimed water reuse facilities in the community are borne by the residents. How to reduce the economic burden on the residents brought by the construction and operation of the reclaimed water system, especially lower than the price of tap water and the additional taxes and fees, so as to improve the The enthusiasm of using reclaimed water is the key to promote the reuse of reclaimed water in the community. This is not only a question of which community or region sets the charging standard, but a question that should be considered by the government from the perspective of environmental protection and energy conservation of the entire country. Only on the premise that the government has already considered the promotion of reclaimed water system in the formulation of the policy, can each region formulate a specific pricing mechanism and form a reasonable water price. Only in this way can the residential miscellaneous drainage treatment and reclaimed water reuse be truly popularized and applied.
  3. Hygiene and health issues
    Since the reclaimed water in the community is mainly used for domestic miscellaneous water and non-contact ornamental landscape water, it is necessary to minimize the entry of toxic or harmful non-domestic sewage into the domestic miscellaneous drainage treatment station of the community to prevent damage to the normal operation of the treatment station. Or affect the quality of effluent water. And from the perspective of sanitation and health, it is necessary to strictly disinfect the reused water. In addition, when using water for greening, sprinkler irrigation should be avoided as much as possible. When it is used as landscape water, it should not be used as landscape water that is easy to form water mist, such as waterfalls and fountains.
    2.4 Environmental coordination of treatment facilities
    As mentioned above, a residential area is an independent area with relatively concentrated and closed population, and the process selection, pipeline laying, and shape design of individual structures for miscellaneous drainage treatment and reclaimed water reuse facilities must take into account the relationship with the surrounding human settlements. adapt. Therefore, it is required to adopt integrated facilities in order to reduce the volume in the design and structure. Try to adopt buried treatment, so that greening can be carried out on the ground. If above-ground treatment is adopted, it must be coordinated with the surrounding environment and minimize secondary pollution such as odor, noise, and sludge. At the same time, intelligent control should be promoted in operation management to further ensure the stable and reliable operation of treatment facilities and the safety of effluent water quality, and also promote the application of advanced sewage treatment processes such as SBR and A2/O in the reuse of residential sewage Promote the application further.

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