Method for recovering ammonia from ammonia waste water

Abstract

The invention discloses a method for recovering ammonia from waste ammonia water, belonging to a separating technique. The invention resolves the technical problem of making ammonia content of the waste-water lower than the environmental protection effluent standard. The invention feeds ammonia-containing waste water into a centrifuger to separate alkali that does not dissolving in water from the waste water, so as to obtain waste ammonia water without solid alkali; and feeding the waste ammonia water without solid alkali into a bubble-plate rectifying tower for rectification and then cooling and obtaining pure ammonia water, which returns to the production line for being reused, where the ammonia content of the distilled waste water is lower than the environmental protection effluent standard so that the distilled waste water can be directly discharged, and the distilling parameters are as follows: steam pressure 0.1-0.5 MPa, waste water flow 2-5 cu M / h, in-tower liquid surface height 1000-2000mm, and waste water temperature 90-110 deg.C. The invention can be used to recover and discharge the solid alkali-containing waste ammonia water.

Description

technical field [0001] The invention relates to a separation technology, in particular to a method for recovering ammonia from ammonia waste water containing impurities such as alkali and salt. Background technique [0002] In the industrial wastewater containing alkali and ammonia produced in the production of the battery industry, the insoluble alkali is easily separated out, but the removal of ammonia is difficult, so various enterprises directly discharge the industrial wastewater containing ammonia, which pollutes the environment and at the same time Ammonia resources are wasted. Contents of the invention [0003] The technical problem to be solved in the present invention is to design a method for recovering ammonia from ammonia waste water, which can recycle and reuse the ammonia in the waste water, so that the ammonia content in the discharged waste water meets the environmental protection standard. The technical solution of the present invention to solve the abov...

AI Technical Summary

Problems solved by technology

[0002] In the industrial wastewater containing alkali and ammonia produced in the production of the battery industry, the insoluble alkali is easily separated out, but the removal of ammonia is difficult, so various enterprises directly discharge the industrial wastewater containing ammonia, which pollutes the environment and at the same time A waste of ammonia resources

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