Cyclic regeneration method and application of town sewage treatment medicament

Abstract

The invention discloses a cyclic regeneration method of a town sewage treatment medicament, and the cyclic regeneration method comprises the following steps of: (1) calcining the town sludge, and then smashing into absolute dry aluminum ash:; (2) adding water and concentrated sulfuric acid to the absolute dry aluminum ash for sufficient mixed reaction; (3) adding a flocculant to a mixed reaction system obtained from the last step for flocculation, and then carrying out filter pressing to obtain filter liquor and a filter cake; (4) washing the filter cake, and merging the filter liquor obtained after washing and the filter liquor obtained from the last step; and (5) adding a heavy metal collecting agent to the merged filter liquor obtained from the last step to remove heavy metals contained in the filter liquor, sufficiently standing, and regulating the aluminum content of an obtained supernatant to obtain liquid industrial aluminum sulfate with aluminum oxide content more than or equal to 7.8 percent by weight. The cyclically regenerated town sewage treatment medicament is applied to sewage disposal; the cyclic regeneration method disclosed by the invention can be used for preparing the liquid aluminum sulfate with industrial application value through a simple process by taking the town sludge as a raw material; and the process is environmental-friendly without generating secondary pollutants and accords with the national sustainable development strategy.

Description

technical field [0001] The invention relates to a recycling method and application of urban sewage treatment agents. Background technique [0002] With the rapid development of China's economy and the acceleration of industrialization and urbanization, the problems of environmental pollution and resource shortage have become increasingly apparent. According to the statistics of the Ministry of Housing and Urban-Rural Development, as of February 2012, the design scale of my country's urban sewage treatment plants has reached 140 million m 3 / d, the number of urban sewage treatment plants is 3184, and the actual treatment capacity has reached 112 million m 3 / d. At present, my country's urban sewage treatment process is mainly based on biochemical treatment, supplemented by physical and chemical treatment. Among them, a large amount of aluminum salt water purifying agent is used in physical and chemical treatment, such as aluminum sulfate and polyaluminum chloride. After ph...

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Problems solved by technology

[0004] The water purifier aluminum salt used in urban sewage treatment plants is mainly produced from aluminum ore powder, aluminum foil acid, industrial waste aluminum slag, inorganic acid, additives, catalysts and other raw materials through heating, acid dissolution, polymerization and other processes. The process is simple, Low cost, good product effect, etc. In addition, it has been reported that raw materials such as aluminum scraps such as aluminum chips are used for production, but this type of method is neither economical nor environmentally friendly, and the process is complicated

[0005] The water purifier produced by the above method is applied to urban sewage treatment plants, and finally becomes a part of semi-dry sludge, which is transported to landfill, which is not conducive to the environment and causes waste of resources

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