As the population continues to grow, so does the need for wastewater treatment. Beijing recently announced a new three-year sewage treatment action plan, and a large number of sewage treatment plants were newly built or upgraded. From a nationwide perspective, urban sewage treatment plants urgently need to speed up the provision of sludge treatment facilities, and the rural township sewage treatment industry has ushered in a broad market. Industry insiders suggested that the government should start with a thorough planning of the environment, regulations on sewage discharge standards, and strengthening supervision to explore market-oriented construction methods and improve related facilities.

Sewage treatment plant transformation to raise the trend

According to the data from the Ministry of Housing and Housing, as of the end of June 2015, a total of 3,802 wastewater treatment plants have been established in cities and counties (hereinafter referred to as cities and towns, excluding other established towns), with a sewage treatment capacity of 161 million cubic meters per day. Among them, there are about 860 Level 1 A projects with daily capacity of 29.25 million cubic meters. Among them, more than 3,000 sewage treatment plants failed to meet Class A emission standards.

Recently, a number of newly built or upgraded sewage treatment plants in Beijing have been in intensive construction projects. The reporter learned from the Beijing Municipal Water Affairs Bureau that by June this year, the upgrading of the Gaobeidian and Xiaohongmen sewage treatment plants, the construction of a new reclaimed water plant and a centralized sludge treatment center will be completed in succession.

The reporter learned that, in addition to increasing the capacity of sewage treatment and improving the quality of effluent, the totally enclosed underground reclaimed water plant will also completely solve the odor and noise problems that plague residents. The reclaimed water will be used for municipal watering, ecological water replenishment of river courses, and reuse of reclaimed water to realize the recycling of water resources.

The Bishui Sewage Treatment Plant, located in the north of Brickfield Village, Liyuan Town, Tongzhou District, was established in 2002 and uses a large area of ​​open aeration treatment tanks. At present, a new underground closed reclaimed water plant with a processing capacity of 180,000 tons per day is under construction. A sports and recreation park with a green belt, sports and recreational and water environment science education base will be built on the ground. It is expected that the main structure will be completed and put into operation in June of next year, and the effluent standard will reach Beijing's new B standard.

After the renovation, sewage treatment standards will increase. In the Fengtai district boudoir reclaimed water plant, reclaimed water treatment equipment is being installed in the underground part, and the quality of the effluent water can meet the Class IV water body standard and it is planned to be completed in June this year. After operation, 600,000 cubic meters of reclaimed water can be processed daily.

Sludge treatment will also become a point of great importance. The boudoir reclaimed water plant will also use sludge treatment processes such as thermal hydrolysis, digestion, and panel dehydration to achieve a harmless sludge treatment. In addition, the biogas generated in the sludge treatment is recycled to the thermal hydrolysis of the sludge in the plant, self-power generation, and other aspects, reducing the overall energy consumption of the sludge treatment. This will ease the pressure of sewage treatment in the southern part of the city and improve the quality of the water environment in the basin.

Recently, the Standing Committee of the Beijing Municipal Government has reviewed and passed the new three-year action plan for the construction of sewage treatment facilities in principle. The plan is mainly aimed at solving the four major problems in water environmental governance: First, the sewage pipelines in central urban areas are not covered; second, there is a dead zone in sewage collection and disposal in urban and rural areas; third, the infrastructure of rural sewage treatment facilities is weak; and fourth, institutional innovation There is not enough co-ordination. According to the plan, in 2019, the Beijing Central City and administrative sub-center built-up areas will take the lead in achieving full coverage of the sewage treatment facilities and the sewage will basically be fully treated. In the next three years, 1081 kilometers of sewer lines will be newly built and upgraded, and 14 sewage treatment plants will be upgraded and newly built. There are 27 reclaimed water plants.

Sewage discharge standards Low sludge treatment facilities lack of facilities

It is worth noting that, according to industry analysts, there are still several major problems in the construction of domestic wastewater treatment plants: weak infrastructure for rural domestic wastewater, lack of supporting facilities for sludge disposal, and low sewage discharge standards.

First of all, there is a big gap between rural sewage treatment facilities. According to the 2015 China Wastewater Treatment Plan, the average sewage treatment rate in the county will reach 70% by 2015 and the township will be 30%. Fu Tao, vice president of the Chamber of Commerce of the National Industry and Commerce Environmental Services Industry Association, said that currently there are few rural domestic sewage treatment facilities, and the overall rural sewage treatment rate is less than 10%. Future township sewage treatment market will have a huge future.

Second, lack of supporting facilities for sludge treatment. According to statistics, the proportion of truly safe sludge disposal in China does not exceed 20%. In the initial construction of most of the sewage treatment plants, there was no sludge treatment equipment, and the phenomenon of “heavy water and light mud” was very serious. In many cases, the sludge generated from the treatment of sewage is treated in a "sweeping landfill" manner. These randomly stacked sludges have not been detoxified and cause environmental pollution.

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