With the increase of urban population in our country and the expansion of its scale, the difficulty of urban sewage treatment is increasing day by day. Sewage treatment will produce more solid waste and its disposal becomes a major challenge nowadays. So, the industry believes that how to achieve sludge reduction, industry companies have done what efforts?
Sludge treatment to reproduce the new path of the overall reduction of more than Liu Cheng
In recent years, China's urban sewage treatment continues to develop, and urban water environment treatment achieved remarkable results. However, during the construction of sewage treatment plants in our country, the phenomenon of "heavy water and light mud" still exists for a long time. Therefore, the reduction and disposal of sludge has become a hot spot in the industry.
The "ditch little famous big" that cow leg ditch located in Linyi City, Linyi City, Shandong Province, western Linshu county, east coast of the river, have also been triggered by the border dispute over the water pollution in Lusu, the upstream companies were once brought to court and was sentenced to compensation Farmers pollution losses, by all levels of government and environmental protection departments focus.
With the completion of the Niuturi Gully Sewage Treatment Plant in Linshu County with a handling capacity of 20,000 cubic meters per day, the sludge here has been reduced and the dispute over the water pollution at the border with the Lusuo River has never seen. The upstream of the Toutou River Enterprises from the lawsuit ridden "bitter sea."
The case of cow leg ditch may provide an answer to sludge reduction. So, the industry believes that how to achieve sludge reduction, industry companies have done what efforts?
What is the power to achieve reduction?
Sludge reduction included in the local government assessment content, sludge disposal fee into the water price system
The Ministry of Housing and Urban-Rural Development on the construction and operation of urban sewage treatment facilities in the first quarter of 2016 in China reported that as of the end of March 2016, a total of 3,910 sewage treatment plants were set up in cities and counties in cities in the country with a daily processing capacity of 167 million cubic meters In the first quarter of this year, the accumulated sewage treatment volume was 12.64 billion cubic meters, with a total reduction of 3.225 million tons of chemical oxygen demand.
At present, China's urban sewage treatment plant basically achieved the initial reduction of sludge, but did not achieve the stabilization of sludge. According to statistics, although 80% of the sewage treatment plants built with sludge dewatering facilities to a certain degree of reduction, but about 80% of the sludge has not been stabilized, resulting in sludge containing malodorous substances, Contaminants such as pathogens and persistent organic pollutants are easily transferred from the sewage to the land and the pollutants are further dispersed. As a result, the environmental benefits of sewage treatment facilities already put into operation are greatly reduced.
Due to the "heavy water and light mud" all along, the sludge disposal costs are not included in the sewage treatment fee. Many people in charge of sewage treatment plants are in a dilemma. Originally, sewage treatment plants were having difficulties in operating their operations. If sludge and capital were harder to deal with, this led some of the sewage treatment plants to bypass the responsibility of disposing of the sludge intentionally or unintentionally.
How to solve the problem of sludge disposal? Yang Xiangping, vice president of the China Association of Urban Water Supply and Drainage, suggested that local governments should take sludge reduction as one of the contents of examination in the assessment of the target responsibility system for energy conservation and emission reduction, and should appropriately raise the score.
Some experts also think that as the main body of sludge disposal, the government originally had to consider a number of expenses such as land acquisition, transportation and operation. If the local treatment mode can be adopted, especially sludge reduction, the above costs will be saved. After a reasonable price estimate, sludge treatment costs can be directly included in the sewage treatment of tons of costs be appropriately adjusted.
Zhou Likui, Chairman of Jinluo Group, proposed that the cost of pollutant disposal should be borne by the producers. It is suggested that the sludge treatment fee should be included in the water price system. In fact, the cost is not high, and the increase is about 0.1 yuan per tonne of water.
Relevant experts believe that after the local government transfers the main body of sludge disposal to the enterprise, it not only needs to assume the functions of supervision and control, but also liberates the investment and operation burden of sludge disposal. "Sludge disposal right to the real market, the government set a good market access plan to determine the sludge does not go out to deal with the environmental requirements, and investment limits, operating costs and other requirements, you can accelerate the sludge disposal." He said .
"You played, I reduce the sludge"
Kim Goro Group SPRAS independent technology so that sludge reduction of 60% -70%
Daily processing capacity of 60,000 cubic meters of Lin'an City, Zhejiang Province, urban sewage treatment plant in normal operation, the factory can not see the busy sludge transport vehicles. Municipal sewage treatment plants of the same size produce almost 80 tons of sludge with a moisture content of 85% per day, but only about 20 tons here. So, where a lot of sludge have gone?
Lin'an City sewage treatment plant sludge reduction, thanks to the application of activated sludge process reduction (SPRAS) technology. Through the process of transformation, from January 2014 to May 2015, the decrement projects have been running steadily. The average sludge reduction amount is about 74%. The effluent quality is up to the standard and the sludge is reduced by more than 70%.
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