Dinitrodiazophenol waste water processing method

Abstract

The invention relates to a dinitrodiazophenol waste water processing method, which relates to a waste water processing method. The invention aims at providing the dinitrodiazophenol waste water processing method which utilizes iron casting iron chips and the electrical bridge function of active carbon to process dinitrodiazophenol waste water. The technical solution is that acid waste water and alkali waste water are firstly mixed during the manufacturing process of dinitrodiazophenol, then iron chips and active carbon are fed into an electrolyzation tower for standby application after being uniformly mixed, waste water firstly enters into an acidifying tank, after the pH value is adjusted to 2 - through acid preparation, precipitator is added under the stirring condition, the electrochemical reaction is carried out through an electrolyzation tower, the waste water processed by the electrochemical reaction enters into a neutralization reaction tank for the neutralization reaction after filtration, alkalescnce preparation is added, and coagulant aid is added when a great deal of fine crystals generate, the granule of sedimentary is bigger, clear liquid on the upper portion is pumped to enter active carbon for adsorption after the neutralization reaction and the waste settlement. The method is mainly used for purifying dinitrodiazophenol waste water which is initiating agent of domestic blasting machines.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating dinitrodiazophenol wastewater using cast iron filings to treat dinitrodiazophenol wastewater, which is a priming agent for civil blasting equipment. Background technique [0002] The treatment of dinitrodiazophenol (DDNP) wastewater has always been a major problem at home and abroad. The wastewater is reddish brown, with a chroma as high as 10,000 times, COD (chemical oxygen demand) as high as 9700mg / L, and a pH value of 12 to 14. Its characteristic "nitrophenols", the highest concentration is as high as 3500mg / L (calculated as picric acid). [0003] For this wastewater, the general treatment methods include yellowed coal adsorption treatment, steaming treatment, sodium hypochlorite treatment, electrolytic treatment with an external electric field, etc., but the effect of wastewater treatment is not stable. The yellowish coal adsorption method is used to ...

AI Technical Summary

Problems solved by technology

The yellowish coal adsorption method is used to treat DDNP mixed wastewater, because the yellowish coal used in the treatment method is easily saturated, and the yellowish coal cannot be recycled, the treatment effect is poor and the cost is too high

Use a large pan to evaporate the alkaline wastewater, and use the sodium hypochlorite oxidation method and activated carbon adsorption method to treat the acidic wastewater (the acidic and alkaline wastewater produced in the DDNP manufacturing process are treated by different methods). The disadvantage of this method is mainly that the large pan handles the alkali The coal consumption of sexual wastewater is large, the evaporation is very small, and the large pan is easily corroded and burnt

The acid-base wastewater generated in the DDNP manufacturing process is mixed and adjusted for post-treatment, and the wastewater is treated by electrolysis, precipitation, and oxidizing agent (sodium hypochlorite) by means of external power supply. Although the treatment effect of this method is good, the main disadvantage is the plate used. easily passivated