Factors affecting urban sewage treatment

1.1 Design of urban sewage treatment pipeline network

          The collection and transportation of urban sewage cannot be separated from the urban sewage pipeline network. The urban sewage pipeline network is an important connecting link between sewage treatment plants and sewage sources. In general, the construction of sewage treatment projects to expand new areas or urban areas can adopt a diversion system; For those old urban areas and small towns that have already built combined sewer drainage systems, we can renovate the original combined sewer direct discharge drainage system and build it into a intercepting combined sewer system; The combined sewer system can only be used in areas with low rainfall. If the interception ratio is relatively large, there will be a significant difference in the amount of sewage during the dry and rainy seasons. At the same time, the quality and quantity of the incoming water to the sewage treatment plant will also change accordingly, causing impact loads. Therefore, the sewage treatment plant should design the process flow and parameter selection based on the changes in the water quality and quantity of the sewage pipeline. In the design process, it is necessary to analyze and verify the changes in water quantity and quality to effectively ensure that the effluent from the treatment plant is stable and meets the standards.

1.2 Treatment of leachate from garbage

          The problem of treating leachate from garbage mainly exists in some small and medium-sized towns. Due to the proximity of sewage treatment plants to cities and the small scale of garbage treatment, it is easy to discharge leachate directly into urban sewage treatment plants without treatment or after pretreatment. So, when designing sewage treatment plants in these areas, it is important to pay attention to the water quality changes and impacts caused by high concentration wastewater from leachate entering the treatment plant. The impact is closely related to the scale of the treatment plant. The smaller the scale of the treatment plant, the greater the impact, and vice versa. The scale of sewage treatment plants is directly proportional to the amount of leachate treated. The larger the amount of leachate treated, the greater the impact on engineering costs, operating costs, and equipment selection.

1.3 Environmental pollution issues of sewage treatment plants themselves

          The sewage treatment plant must meet the national discharge standards for sewage treatment. Although the sewage meets the national discharge standards, the sludge generated during the sewage treatment process cannot be effectively disposed of, which can also cause secondary environmental pollution; Moreover, the odor generated during the sewage treatment process is also a difficult environmental pollution problem to solve. The odor generated during the sewage treatment process not only affects the environment of the sewage treatment plant, leading to health problems for operators, but also affects the living environment of surrounding residents, causing pollution to the surrounding environment. Therefore, we must take measures to install deodorization devices to solve the environmental pollution problem of the treatment plant. Sewage treatment is to protect the environment, and as environmental protection enterprises, we must do a good job in environmental protection.