Treatment method of phosphorus-containing wastewater

Abstract

A method for treating phosphorus-containing wastewater, characterized in that the high-concentration phosphorus-containing wastewater is first decolorized by waste activated carbon, filtered and then transported to a neutralization reaction pot, and 230-270kg of 50% potassium hydroxide is added per ton of phosphorus-containing wastewater The proportion of the solution is passed into the potassium hydroxide solution, stirred for 5-6 hours, and then the material is transported to the concentration tower, and the temperature is raised to 130-150°C. The water is evaporated under normal pressure and condensed and collected, and then used to clean the ground. The material in the concentration tower is separated from solid and liquid, and the separated potassium dihydrogen phosphate is transferred to the drying room for drying to obtain the finished product of potassium dihydrogen phosphate. In this production and recycling process, the waste water is turned into potassium dihydrogen phosphate and clean water is reused for ground cleaning, and the production process does not increase the amount of waste water produced. The invention turns waste into wealth, not only reduces pollution, but also recycles and utilizes effective components in waste water, has advanced technology, simple process, low operating cost and less discharge.

Description

technical field [0001] The invention relates to a method for treating phosphorus-containing wastewater. Background technique [0002] In the production of quinacridone pigments, a large amount of phosphoric acid wastewater will be produced after the closed-loop hydrolysis of polyphosphoric acid, which has high phosphorus content and is difficult to handle, which has always been a problem that plagues the development of enterprises. The amount of wastewater is large, the color is dark, and the treatment cost is high, which directly restricts the production of pigments. Contents of the invention [0003] The technical problem to be solved by the invention is to provide a treatment method for phosphorus-containing wastewater that turns waste into treasure, reduces pollution, and recycles effective components in the wastewater. [0004] The technical solution created by the present invention is: a treatment method for phosphorus-containing wastewater, which is characterized i...

AI Technical Summary

Problems solved by technology

[0002] In the production of quinacridone pigments, a large amount of phosphoric acid wastewater will be produced after the closed-loop hydrolysis of polyphosphoric acid, which contains high phosphorus and is difficult to handle, which has always been a problem that plagues the development of enterprises.

Large amount of wastewater, deep color, high treatment cost, directly restricting the production of pigments