Standard for municipal industrial sewage pipe

The municipal sewage interception pipe was a water pollution treatment project. By constructing and transforming the sewage pipeline inside the sewage generating unit and connecting it to the sewage pipeline system under the town road, the sewage was finally transported to the sewage treatment plant for central treatment. This project played an important role in urban sewage treatment. The goal of the sewage interception project was to intercept and concentrate sewage to reduce pollution to rivers and water bodies. In order to achieve this goal, it was necessary to dismantle the original sewage treatment facilities, renovate and build sewage pipes, and strengthen the sewage collection and treatment capacity. In addition, the sewage needed to be pre-treated to ensure that the sewage reached a certain treatment standard before entering the municipal sewage pipe network. The implementation of the sewage interception project required the investment and support of the government. At the same time, it was necessary to establish a corresponding work system and assessment mechanism to ensure the smooth progress of the project. At present, some cities have begun to implement sewage interception projects and have achieved certain results. However, there were still some problems in the implementation process, such as old and damaged pipe network, sewage overflow, etc., which needed to be further solved. In general, the municipal sewage interception pipe was an important water pollution control project, which had positive significance for improving the quality of the urban water environment.

The sewage interception technology was a water pollution treatment project. By constructing and transforming the sewage pipeline inside the sewage generating unit and connecting it to the sewage pipeline system under the city road, the sewage was transported to the sewage treatment plant for treatment. This technology was the most direct and effective engineering measure in the treatment of black and smelly water bodies, and it was also the premise of other technical measures. The sewage interception pipe could control the discharge of sewage within the city, including sewage outlets, rainwater pipe outlets, etc. It laid sewage interception pipeline along the river and lake, and reasonably set up pumping stations to intercept the sewage and incorporate it into the urban sewage collection and treatment system. The implementation of the sewage interception pipe project needed to consider the elevation of the overflow device's discharge outlet and the water level of the water body, and set up a non-return device to prevent reverse flow during heavy rain. However, the implementation of the sewage interception and management project faced some limiting factors, such as the large amount of work and one-time investment, the difficulty of project implementation, and the long period. In addition, the sewage entering the sewage treatment plant after intercepting the sewage pipe may cause greater operating pressure on the existing urban sewage system and sewage treatment plant, so bypass treatment may be needed.

The significance of the domestic sewage pipe project was to improve the water environment in urban and rural areas, improve the sewage treatment capacity, protect water resources, and promote sustainable development. This project could improve drainage efficiency, reduce urban waterlogging problems, and improve the urban living environment. At the same time, it could also purify the water environment and reduce the pollution caused by the direct discharge of urban and rural domestic sewage into the water body. In addition, the domestic sewage pipe project could also eliminate black and smelly water bodies, improve the aquatic ecological environment, and reduce the entry of nutrients into the water. For society, a complete sewage pipe network was not only conducive to improving the city's functions and upgrading the city's quality, but also to improving the living environment of residents, improving the happiness index of the people, and meeting the growing needs of the people for a healthy and beautiful ecological environment. Therefore, the domestic sewage pipe project was considered an important livelihood project, which had positive significance for social stability and urban development.

The Level 3 standard of the comprehensive sewage discharge standard referred to the sewage discharged into the urban drainage system of the secondary sewage treatment plant. The Level 3 standard was implemented.

The sewage treatment standards were divided into Level 1, Level 2, and Level 3. According to the Integrated Waste Water Discharging Standard, the first-class standard was applicable to the discharge of sewage into Class III water areas (except for designated protected areas and swimming areas) and Class II sea areas in Class B. The Level 2 standard is applicable to the discharge of sewage into Class IV and V waters in the standard of the national standard 3838 and Class III sea areas in the standard of the national standard 3097. The Level 3 standard was applicable to the situation where the sewage was discharged into the urban drainage system with a secondary sewage treatment plant. The specific standard values and requirements may vary by region and industry.

There were two different descriptions of the first-class standard of the integrated sewage discharge standard. According to documents [4] and [9], the Level 1 standard refers to the water quality of the discharged sewage after treatment reaching Level A of the Level 1 standard. The water quality is required to be clear, transparent, colorless, odorless, free of suspended substances, odor, and impurities, and meet the hygiene standards for drinking water. According to document [2] and document [3], the first-level standard refers to the sewage discharged into the Class III water area of the national standard 3838 (except for the designated protected areas and swimming areas) and the sewage discharged into the Class II sea area of the national standard 3097. Due to the inconsistent descriptions in the search results provided, it was impossible to determine which description was the specific first-level standard.

The horizontal drainage pipes shall be connected with the horizontal drainage pipes by oblique three-way, oblique four-way or three-way and four-way along the water. To be specific, the connection between the horizontal sewage pipes should not be made with a straight three-way or a straight four-way, but with an inclined three-way or an inclined four-way or a straight three-way or a straight four-way. These connections could ensure the normal operation and drainage effect of the drainage pipeline.

The main pipe, main pipe, and branch pipe had different definition and functions in the water supply system. The following conclusions: The main pipe referred to the pipe section from the indoor main valve (or water meter) to the water supply standpipe. It was usually in the form of a standpipe, responsible for guiding water from the water source to various locations in the building. The main water supply line was usually the main water supply line in the system and could span multiple floors. The main pipe referred to the pipe section from the water source to the most unfavorable point. The most unfavorable point could be the farthest water distribution point or the highest water distribution point. The main pipe was usually in the form of a vertical pipe or a horizontal pipe, because it must have small pipes that were divided from other pipes. These small pipes were branch pipes. The function of the main pipe was to connect the pipe section of the household pipe and the branch pipe to carry out up and down transportation. The branch pipe was a water distribution pipe on the same floor, starting from the main pipe and ending at the water distribution valve of the faucet or sanitary ware. The branch pipe was usually a horizontal pipe that connected to sanitary ware or other water points. In summary, the main pipe, the main pipe, and the branch pipe have different meanings and functions in the water supply system. The main pipe was the main water supply line, the main pipe was the pipe section that connected the household pipe and the branch pipe to transport water up and down, and the branch pipe was the water distribution pipe on the same floor.

There were many reasons for the overflow of sewage. The following were some of the possible reasons: 1. Failure of the sewage treatment facilities of the enterprise: The failure of the sewage treatment facilities of a paper factory caused the sewage to not be treated, and the sewage flowed into the nearby water body. 2. [Sewer blockage: The sewers of a certain residential area are blocked by oil, causing the sewage to not be discharged normally and flow into the residential area.] 3. [Blocked sewage pipe: The sewage pipe of a certain residential area is blocked, causing sewage to leak from the floor to other floors or corridors.] 4. Septic tank and drainage pipe facilities are old: The facilities of the manure tank and drainage pipe in the old community are old, and it is easy to cause blockage and sewage crossflow. 5. Waste water overflow in car wash shops: When some car wash shops wash cars outdoors, the sewage will flow onto the sidewalk, affecting pedestrians. It should be noted that the above are only some possible reasons. The specific situation may vary according to the region and environment.

The rural domestic sewage referred to the polluted water produced by rural residents in their daily lives, mainly including toilet sewage, kitchen sewage, bathing sewage, and livestock sewage. The main characteristics of rural domestic sewage are high dispersion and difficult to collect uniformly; small amount of water, but large fluctuation of water, with obvious seasonal changes; high concentration of organic matter, but no harmful substances; water quality and water volume vary greatly in different regions. The problems of rural domestic sewage treatment included imperfect governance mechanism, lack of focus on governance, unreasonable evaluation of governance effectiveness, and unscientific governance model. In recent years, China has taken a series of measures to promote rural domestic sewage treatment, but it still faces challenges in terms of standards, technology, funding, and mechanisms.