COD remover

Abstract

The invention discloses a COD remover. Ferrate is taken as a main agent and is compounded with an organic flocculant and a metal salt as auxiliary materials, the coagulation time is short, the COD remover is suitable for high-salt high-COD organic wastewater treatment of various processes, the treatment efficiency is high, the comprehensive cost is low, and the removal rate of COD is 97% or above.

Description

Technical field [0001] The invention belongs to the technical field of organic wastewater treatment, and specifically relates to a COD remover. Background technique [0002] Since the 1990s, with the rapid development of my country's textile industry, the printing and dyeing industry has expanded rapidly, and the production and use of dyes have increased. As a result, a large amount of dye wastewater with high COD, high chroma, high toxicity, high salinity, and low B / C is produced. According to statistics, the total amount of dye wastewater produced by the printing and dyeing industry in 2009 has reached 2.43 billion tons, accounting for more than 80 shares of the total discharge of wastewater from the textile industry. This kind of dye wastewater has the characteristics of "four highs and one low" and is related to the types of dyes used. At the same time, in the production of dyes, the enrichment of salts in the discharged wastewater is mainly caused by the production process...

AI Technical Summary

Problems solved by technology

Fenton chemical oxidation method is to take hydrogen peroxide as oxidant, a kind of method that organic matter is carried out oxidative degradation under the action of ferrous ion, and its advantage is that operation condition is milder, but its shortcoming is also obvious: 1) because ferrous ion has to hydrogen peroxide Strong catalytic decomposition effect leads to low utilization rate of hydrogen peroxide and high treatment cost; 2) Fenton chemical oxidation method needs to adjust the pH of wastewater to be close to neutral first, so it will consume acid and alkali, and at the same time introduce other types of inorganic salts ; 3) The Fenton chemical oxidation method is mainly to convert refractory organic matter into organic matter that is relatively easy to biochemically degrade. Generally, organic matter cannot be completely degraded, so it can only partially remove COD, and it will enter the biochemical treatment device for secondary degradation. Therefore, this method Usually it can only be used as a pretreatment method for refractory organic wastewater; 4) For high-salt wastewater, after being treated by Fenton chemical oxidation, the content of inorganic salts is not reduced, and it must be diluted to perform biochemical degradation, otherwise bacteria in the biochemical degradation process Unable to adapt to high salt content; 5) High-salt wastewater treated by Fenton chemical oxidation method is not suitable for direct and efficient evaporation desalination, because Fenton method cannot completely degrade organic matter, and these residual organic matter are easy to enter inorganic salts, resulting in desalination after removal Inorganic salts become solid hazardous waste

[0008] Due to the high concentration of this kind of waste liquid, the treatment process is often complicated, the input of equipment is large, and the cost of chemicals is high, which makes the cost of waste liquid treatment too high, which is difficult for ordinary companies to bear. Most companies regard waste liquid with high salt and high COD content as hazardous The high-priced waste is handed over to professional companies for processing, but some companies have taken risks due to cost pressures, illegally and secretly discharged, and directly discharged into the urban pipe network and entered the sewage treatment plant, which seriously affected the normal operation of the urban sewage treatment plant.