Method for treating town sewage

Abstract

The invention discloses a method for treating town sewage. The method comprises that: after large granular impurities in the town sewage are removed by a crude separation device, the town sewage enters a denitrifying section of a suspended biological filter reactor and then is subjected to denitrification and removal of partial organic pollutants by using denitrifying bacteria and facultative aerobe attached to biological carriers; and the denitrifying section yields water to an aerobic carbonization section, most organic pollutants are removed by aerobic heterotrophic bacteria, then the aerobic carbonization section yields water to an aerobic nitration section, ammonia nitrogen in the sewage is removed by the nitrobacteria attached to the biological carriers, the aerobic nitration section yields water to a sludge accommodating filter, the phosphorus-containing sediment generated by coagulating sedimentation is intercepted by the sludge accommodating filter, and finally the town sewage can be discharged after reaching standards and also can be recycled. The method can efficiently remove the organic pollutants, ammonia nitrogen and total nitrogen, and is easily realized by complete equipment. The adopted suspended biological filter needs no filter plate, shortens construction period and reduces investment. The method is suitable for sewage treatment of medium-small towns.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for treating urban sewage. Background technique [0002] With the rapid development of the economy and the continuous improvement of the level of urbanization, as well as the relative lag of related social public utilities, especially environmental protection, organic pollution of rivers in my country is widespread, and the pollution is becoming more and more serious. serious. Since 1999, the load of urban sewage has exceeded the pollution load of industrial wastewater for the first time, and the rapid development of small and medium-sized cities in my country will continue for a long time. It is estimated that the urban population will reach 560 million in 2010. The key direction of water pollution control in my country is urban sewage. pollution control. The coverage rate of urban sewage treatment facilities in my country is low; in newly developed residential areas, to...

AI Technical Summary

Problems solved by technology

After years of operation, there are the following problems: 1. The ceramsite is broken, resulting in a decrease in system processing efficiency; 2. The aeration pipe is broken, and the ceramsite in the entire device needs to be removed and replaced, and the workload is very heavy; 3. Recoil strength Large and high frequency, ceramsite as a heavy filler requires a large amount of recoil gas, and the recoil pressure is not easy to control, resulting in the shedding of active biofilm and poor water quality; Under the premise that the substance concentration is less than 100mg / L, it needs to be recoiled once every 3-6 days

Its characteristic is that the effluent water quality is good, and the disadvantage is that it has poor adaptability to hydraulic changes.

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