Phosphorus chemical wastewater treatment method

Abstract

The invention provides a phosphorus chemical wastewater treatment method comprising the steps of a, mixing of inorganic phosphorus chemical wastewater and acid wastewater in the volume ratio of (2-3): 1; b, adding of carbide slag slurry and / or lime milk into the mixed wastewater for neutralizing to pH of 8.0-9.5; and c, standing and sedimentation of the wastewater obtained by the step b, filtration of supernatant by a sand filter unit for up-to-standard discharge or reuse, solid-liquid separation of lower layer thicken slurry, returning and sedimentation of filtrate, and stacking processing of a filter cake. The beneficial effects are as follows: compared with the prior art, a mixing processing manner of the inorganic phosphorus chemical wastewater and the acid wastewater in sulfuric acid process titanium dioxide industry is used, the processing process is simple, water solid separation of the treated reaction system is easy, the pH of the treated wastewater is not needed for adjusting, the content of phosphorus, fluorine and arsenic in the treated and discharged wastewater is in line with the national emission standards, phosphorus chemical industry and titanium chemical industry can be further combined, and the method has good social and economic benefits.

Description

technical field [0001] The invention relates to a method for treating phosphorus chemical wastewater. Background technique [0002] Inorganic phosphorus chemical industry is one of the basic raw materials for the development of my country's national economy, and has a production history of more than 100 years in China. At present, in the production of inorganic phosphorus chemical industry in my country, most of them use yellow phosphorus as raw material, and a small amount of them use wet-process phosphoric acid as raw material. Both thermal and wet production of phosphate have a certain impact on the environment during the production process. At present, the inorganic phosphorus chemical industry implements the national comprehensive emission standard GB8978-1996. For general inorganic phosphorus chemical enterprises, the cost of discharging wastewater after treatment or the full cycle after treatment is too high for enterprises to bear, and illegal discharge often occur...

AI Technical Summary

Problems solved by technology

Although the above methods can achieve ideal results in the treatment of inorganic phosphorus chemical wastewater, there are problems such as high treatment cost, long process flow, and the need to adjust the pH value.