High-COD and high-salt waste liquid treatment technology

Abstract

The invention discloses a high-COD and high-salt waste liquid treatment technology which comprises the following steps: collecting high-ammonia-nitrogen and high-COD waste liquid in a water collecting tank, and conveying the high-ammonia-nitrogen and high-COD waste liquid to an integrated Fenton oxidation tower by a pump through a pipeline; in the integrated Fenton oxidation tower, respectively conveying sulfuric acid, hydrogen peroxide, a ferrite solution, sodium hydroxide, PAC and PAM into the tower by a pump, and adjusting the pH value of the waste liquid to 2-4 before the waste liquid enters the Fenton oxidation zone in the tower, wherein the Fenton oxidation zone in the tower adopts a medium-temperature Fenton oxidation technology, so that the temperature of the Fenton reaction zone is kept at 50-60 DEG C. In the Fenton oxidation process, a large amount of hydrogen peroxide is saved, the addition amount is 1 / 10 of that of a traditional Fenton method, the COD and salt removal effect is obvious, and after the original waste liquid with the salt content of 5% and the COD of 60000mg / L is subjected to the first-step medium-temperature Fenton treatment, the salt removal rate reaches 99% or above, and the COD removal rate is about 50%; the COD removal rate is increased to 70% after the treatment of the three-phase catalytic oxidation tower; finally, after evaporation treatment, the COD removal rate reaches 95% or above.

Description

technical field [0001] The invention relates to the technical field of waste liquid treatment, in particular to a high-COD and high-salt waste liquid treatment technology. Background technique [0002] In recent years, the rapid development of my country's chemical industry has made great contributions to economic development, but it has also brought about environmental pollution. In the chemical industry, especially in the production of pesticides and medicines, a large amount of waste liquid will be produced, including A considerable part of the waste liquid conforms to the characteristics of hazardous waste and has great potential harm to humans or other organisms. [0003] At present, the treatment methods for high-COD and high-salt hazardous waste liquid mainly include incineration and physical and chemical methods. Among them, the incineration method has a better treatment effect on COD in waste liquid, but when using There will be coking in the rotary kiln, blockage c...

AI Technical Summary

Problems solved by technology

[0003] At present, the treatment methods for high-COD and high-salt hazardous waste liquid mainly include incineration and physical and chemical methods. Among them, the incineration method has a better treatment effect on COD in waste liquid, but when using There will be coking in the rotary kiln, blockage caused by salt crystallization in the quench tower and the flue, which will affect the normal operation of the incineration system. Physicochemical method is an effective means to deal with high COD and high salt waste liquid. For the treatment of hazardous wastes, electrolysis, multi-effect evaporation, concentration and crystallization, and biological methods are often used. In addition, there are emerging technologies such as membrane separation, ion exchange, ozone oxidation, and advanced oxidation technology. For hazardous waste liquids, due to waste liquids The sources are different, the range of water quality fluctuations is very large, and it is biologically toxic. Biological methods cannot be used, and a single physical and chemical treatment process cannot meet the water quality requirements of the effluent. The combination of a large number of processes will greatly increase the cost of operation and increase the difficulty of operation. Therefore, There is an urgent need for a process that is easy to operate, cost-effective, adaptable, and has a large processing capacity to meet the treatment of high-COD and high-salt hazardous waste liquid

Images