Technology for extracting recyclable substances in sewage

Abstract

The invention discloses a technology for extracting recyclable substances in sewage, and relates to the field of sewage treatment. Suspended solids in sewage to be treated are reduced and separated, the suspended solid content-reduced sewage undergoes ultrafiltration and separation reverse osmosis to obtain an ammonia nitrogen retentate with a high COD value and a high TDS value, calcium oxide isadded to alkalize the retentate, the alkalized retentate is connected into a decanting device, a slaked lime peeled precipitate and a liquid 5 which are formed after alkalization of a liquid 4 are respectively discharged from two outlets of the decanting device, the liquid 5 is introduced into a washing tower, sulfuric acid is added into the washing tower to form an ammonium sulfate solution together with the liquid 5, and the slaked lime peeled precipitate is connected into a second centrifugal separator through a treatment pipeline 3 to separate the slaked lime, so the working efficiency ofthe second centrifugal separator is improved; and the technology realizes the extraction of the recyclable substances from the sewage, and the recyclable substances are used in fertilizers and soil improvers for various soils and crops, so resource wastes are reduced, a large economic cost is saved, and the earth's surface pollution is reduced.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a process for extracting reusable substances in sewage. Background technique [0002] In recent years, with the development of all walks of life in society, water pollution problems have also been brought about. Sewage contains high-concentration organic matter, COD, and TDS ammonia nitrogen, which must be treated before being discharged to avoid polluting the environment. The process is mainly based on the standpoint of extracting ammonia nitrogen from sewage to meet the discharge standard, while ignoring that there are still some usable substances in sewage, which can be reused after treatment, which not only reduces pollution emissions, but also enables waste to be reused, saving economic costs. Therefore, there is an urgent need to develop a process for extracting usable substances from sewage. Contents of the invention [0003] The purpose of the present invention is to pr...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a process for extracting reusable substances in sewage, to solve the problem that the process of sewage treatment in the prior art mainly starts from the standpoint of extracting ammonia nitrogen from sewage to meet the discharge standard, while ignoring the fact that there are still some Usable substances can be reused after treatment, which not only reduces pollution emissions, but also enables waste to be reused, saving economic costs

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