Method for processing urban sewage deeply

Abstract

This invention is related to a process of disposing urban sewage, which comprise the steps of coagulate filtration, ozone oxidation, biological oxidation to dispose urban sewage, so that the residual undegradable organic substances, bacteria and virus in the second-class urban sewage can be removed and the water can be recycled. According to different usages of the recycled water, the process also comprises reverse osmosis or nanoscale filtration treatment to further remove the residual organic and inorganic substances in the water. The process is a combination of coagulate filtration, ozone oxidation, biological oxidation and reverse osmosis, designed to resolve such problems as urban sewage disposal and water recovery. The process can obtain high-quality recycled water with a low cost, showing high cost performance, which is important to resolving urban water depletion, raising the utilization rate of water resources, reducing environmental pollution and promoting sustainable development of the society.

Description

technical field [0001] The invention relates to a method for advanced treatment and safe reuse of urban sewage. Background technique [0002] my country is a country with relatively poor water resources, and the distribution of time and space is uneven, which does not match the local population, cultivated land resources and economic layout of our country. Especially with the rapid development of social economy and the acceleration of urbanization, the problems of urban water shortage and environmental pollution are particularly prominent, and water resources have become an important factor restricting social and economic development. Urban sewage, which is almost equal to the amount of urban water supply, contains about 0.1% of pollutants. It has the characteristics of sufficient water volume and stable water quality. It is a potential water resource and can be used as a reliable second water source for the city after proper treatment. This has become the consensus of all ...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem that the secondary effluent still contains a small amount of harmful organic matter, bacteria, viruses, etc. when using coagulation sedimentation filtration treatment and recycling technology in the prior art when treating urban sewage, and the chroma is relatively high and the odor is prominent ; The cost is too high when using activated carbon and membrane separation as the main combination process, and the regeneration of activated carbon is complicated, and the membrane is easy to pollute; and the use of soil aquifer treatment occupies a large area and the defects of inconvenient management, thus providing a secondary treatment for urban sewage A method of advanced treatment of urban sewage that is designed for effluent quality characteristics, can effectively reduce the content of residual organic matter, color and odor, is low in cost, and is easy to operate

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