The huge sewage treatment system in Shanghai is like a “ the scavenger ” the turbidity is clear, bringing new vitality to the international metropolis. Now, the sewage treatment standard of &ldquo, scavenger &rdquo will further improve. By the end of 2015, the discharge standard of all urban sewage treatment plants will be upgraded to the first level B standard.
Health grade self-priming pump in the annual capacity expansion of Bai Long Hong Kong sewage plant
The capacity of sewage treatment increased to 2 million 800 thousand tons, with more than 70 million people serving.
The white dragon port sewage treatment plant is located in the Yangtze River port in Shanghai, and is now the largest sewage treatment plant in Asia. Every day, a total of 2 million tons of domestic sewage from Huangpu, Xuhui, Putuo, Minhang, Changning, Jingan and Pudong finally gathered here, and they were discharged into the sea after being processed at all levels. If the white dragon port sewage treatment plant is suspended for one day, the nearby sea will be black, and the consequences may take several years to redeem it. Use the city “ the scavenger ” to call it, it's just the right thing to do.
The day before, the reporter went to the Bailonggang sewage treatment plant sewage, on the central control building in the viewing platform to see this scene: 10 football field sized sewage treatment pool Olga, 8 egg type sludge digestion tank is 8 “ the &rdquo dome stands in the East Sea, and; a piece of green plants full of vigour. From the initial biological treatment pool, the reporter can see that the water is clear from turbidity to the pool that is basically completed.
It is understood that the COD (chemical oxygen demand) concentration is 40 mg / L after the final disinfection process, which is lower than the national level two emission standard. The staff told reporters that every drop of water flows from the water plant to the sea, and it will take at least 16 hours to go through the whole process, such as initial settlement, anaerobic and ultraviolet disinfection. Every day, the white dragon port sewage treatment plant, located at the Yangtze River port, will complete the purification of 2 million tons of sewage in accordance with the above steps, serving more than 70 million people.
According to statistics, the annual sewage treatment plant of Bai Long port sewage treatment plant reached 7.3 million tons, which is equivalent to 71 times the water storage capacity of West Lake in Hangzhou. “ in 11th Five-Year, ” during the period, the total amount of COD emission reduction in the wastewater treatment plant of Bai Long port was 70 thousand tons, and half of Shanghai city was completed. By last year, the daily treatment of sewage in Bai Long port was 2 million tons, accounting for 1/3 of the treatment in Shanghai. Reporter learned that this year, the white dragon port sewage treatment plant will be further increased energy, the two phase of the expansion of the project is running debugging stage, is expected to be formally put into production at the end of the year. The capacity of the wastewater treatment plant will be 800 thousand tons per day, and the sewage discharge will reach the first grade B standard, and the quality of the effluent will be further improved.
Upgrading of sewage treatment standard is being carried out
According to “ one plant and one program ” reformed, reaching the first level B standard by the end of 2015
According to Ruan Renliang, deputy chief engineer of Shanghai Water Affairs Bureau, at present, the sewage treatment rate of Shanghai has been over 85%, and the daily handling capacity has reached 6 million 900 thousand tons, which is second to none in the domestic cities. The remaining 14% of the blind area is mainly in the rural areas, and the sewage has not been collected.
At present, Shanghai central city built-up area sewage collection pipe network basically achieve full coverage, the suburbs 39 sewage treatment plant sewage collection pipe network framework services within the scope of the basic form, the fifth round three year environmental action plan period a total of one or two new sewage collection pipeline about 3600 kilometers. According to the introduction, in the central city of Shanghai, the rate of sewage collection is close to 100%.
But in the rural areas of the suburbs of Shanghai, because of the large number of villages and the scattered living of farmers, the difficulty of laying the pipe network is high and huge investment, and a considerable part of the domestic sewage has not been collected. In view of this problem, Shanghai has explored flexible solutions in recent years, and has established decentralized small centralized treatment stations in rural areas. Now, 40 thousand farmers' sewage has been added to the treatment category every year.
According to the national standard, the discharge standard of pollutants from sewage treatment plants is divided into three categories: first class A, first class B and two level. The COD concentration limits in tail water increase from 50mg/l to 60mg/l to 100mg/l. The existing sewage treatment plant in Shanghai has a low overall level of discharge standard, and 8 of the sewage treatment capacity only reaches the level of two.
According to the introduction, in Shanghai 53 sewage treatment plants, 8 and 17 seats were built according to the first grade A and the first grade B standard, and the rest were built with the standard of grade two. According to the "water pollution prevention and control plan of the middle and lower reaches of the Yangtze River", the emission standards of all urban sewage treatment plants must be upgraded to the first grade B standard at the end of 2015.
“ at present, the sewage treatment plant is making the proposed scheme according to the principle of ‘ one plant and one program ’ the transformation scheme is still in the process of demonstration. ” Ruan Renliang revealed that some of the better sewage treatment plants, which are well based, will be reformed by the end of 2014.
Sludge disposal still needs to be strengthened
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