1) Water quantity and water quality change greatly. Some residential members are basically employees of the same unit, and their working hours are more concentrated, and the coefficient of change in water consumption is very large. Other communities are industrial enterprises, which not only consume large amounts of water, but also often have to drain water intermittently, which has an impact on water quality and quantity .

    2) Poor quality of management staff. Most of the sewage treatment in the community does not have a specialized sewage treatment professional, and they have little knowledge of the treatment process, and can not deal with problems in the process of operation in a timely manner.

    3) The mobility of management staff is large. In many communities, there is no long-term fixed management staff for sewage treatment work, and the replacement is frequent. Due to frequent job changes, on-the-job staff have no long-term plans, are uneasy about their job, do not study the business, and have a low level of technology.

    4) In the initial stage of construction of some communities, no sewage treatment was considered and no sewage treatment site was planned. Therefore, the sewage treatment in the residential area can only be adapted to local conditions, and pins can be seen near the main drainage outlet.

    5) Each district has its own architectural style. Sewage treatment facilities must be coordinated with the surrounding environment. Do not build sewage treatment facilities in a prominent place in the district.

    6) Sewage treatment facilities in the residential area are often close to buildings and people's activities. The impact of sewage treatment machinery noise and odors on the environment should be reduced as much as possible.

    7) The sewage treatment funds in the community are mostly self-raised by the residential units. Generally, the total amount of funds is limited, and the funds should be reasonably arranged.

    Issues that should be paid attention to when formulating sewage treatment process in the community:

    1) The processing technology is mature, reliable, and the process is simple. The equipment and piping required are less. The equipment used should be universal equipment.

    2) When formulating the process parameters, it should be determined according to the characteristics of water quality and water volume change in each district.

    3) The equipment, operation and control should be simple, easy to maintain, and easy to replace. 4) Use integrated structures or equipment as much as possible. This integrated process can combine the processing units together. Each unit is separated by only one partition wall (or partition), and an opening is set on the partition wall to realize the link between adjacent units. Staggered to form one body. This method has the advantages of small footprint, few connected pipes, simple operation, and low initial investment and operating costs.

    4) Use buried or semi-underground forms as much as possible, burying all or most of the sewage treatment station underneath and greening it. Fully buried can be set under the green road of the community planning, it will not affect the community landscape, and it will not occupy the original building planning land.