Method for cyclically using magnesium ammonium phosphate to treat ammonia nitrogen pollutants

Abstract

The invention provides a method for cyclically using magnesium ammonium phosphate to treat ammonia nitrogen pollutants. The method comprises the steps that the pH of water to be treated is regulated to be 8 to 8.5; magnesium chloride and disodium hydrogen phosphate are added; stirring is performed at 20 DEG C to 40 DEG C; centrifugation is performed to obtain magnesium ammonium phosphate precipitates and ammonia nitrogen removed liquid, so that the ammonia nitrogen pollutants in the water to be treated are removed; the ammonia nitrogen removed liquid is centrifuged; the obtained magnesium ammonium phosphate solids are heated and dried; a sodium hydroxide solution is added; pyrolytic reaction is performed to obtain ammonia gas, magnesium chloride and sodium dihydrogen phosphate; ammonia gasis condensed into ammonia water; the magnesium chloride and the sodium dihydrogen phosphate are repeatedly subjected to operations in the first step; the method for cyclically using magnesium ammonium phosphate to treat ammonia nitrogen pollutants is completed. The method for cyclically using the magnesium ammonium phosphate to treat the ammonia nitrogen pollutants has the advantages that the cost is low; the process is simple; the ammonia setting effect is obvious; the method is suitable for the emission reduction treatment on nitrogen pollutants of point source high-ammonia nitrogen steam stripping purified water of refinery enterprises from the source head.

Description

technical field [0001] The invention relates to a method for treating ammonia nitrogen pollutants, in particular to a method for recycling ammonium magnesium phosphate to treat ammonia nitrogen pollutants, and belongs to the technical field of sewage treatment. Background technique [0002] The nitrogen in the oil product is converted and migrated to the water phase during the primary and secondary processing of crude oil, forming a large amount of high-ammonia nitrogen sewage (acidic water). Water, part of stripped and purified water is reused as water injection to the electric desalination device, and then discharged to the sewage treatment plant, and part of it is directly discharged to the sewage treatment plant. [0003] The analysis of nitrogen discharge in the source sewage showed that the steam stripped purified water was the largest contributor to the total nitrogen load of the sewage treatment plant. The analysis of the denitrification capacity of the conventional...

AI Technical Summary

Problems solved by technology

However, the large consumption and high cost of ammonium magnesium phosphate precipitation method are the key factors that limit the popularization and application of this technology.

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