High-concentration COD wastewater recycling treatment system and method

Abstract

The invention discloses a high-concentration COD wastewater recycling treatment system. The system comprises an extraction device and a COD resin adsorption column. The extraction device is provided with a wastewater inlet, an extracting agent inlet, a stripping agent inlet, a raffinate outlet and a strip liquor outlet. The COD resin adsorption column is provided with an adsorption water inlet, anadsorption water outlet, a back flushing fluid inlet and a reclaimed water outlet. The raffinate outlet is connected with the adsorption water inlet, the strip liquor outlet is connected with an acidification system, and the reclaimed water outlet is connected with the acidification system. Alkali serves as a stripping agent, and alkali solution serves as back flushing fluid. The system is simplein structure, and recycling of tobias acid and hydroxyl tobias acid in high-concentration COD wastewater, recovering of an extracting agent and regeneration of resin are realized. The invention further discloses a high-concentration COD wastewater recycling treatment method. Wastewater treated according to the method reaches discharge standards, and the recovery rate of tobias acid and hydroxyl tobias acid reaches 90% or above.

Description

technical field [0001] The invention relates to a waste water treatment system and method, in particular to a system and method for resourceful treatment of high-concentration COD waste water. Background technique [0002] Turbine's acid (2-amino-1-naphthalenesulfonic acid) and hydroxytuff's acid (2-hydroxyl-1-naphthalenesulfonic acid) are usually important intermediates as naphthalene-based dyes. Due to the large amount of naphthalene-based dyes, therefore , in the large-scale production process, it is inevitable to produce a large amount of high-salt wastewater containing Tuolic acid and hydroxy Tuolic acid. This type of wastewater not only has high acidity, but also contains a large amount of salt, which is difficult to achieve by conventional biochemical treatment methods. Deep processing. At present, for such high-concentration wastewater (COD>10000), advanced oxidation methods are usually used, such as ozone oxidation, Fenton method, electrolytic oxidation method, ...

AI Technical Summary

Problems solved by technology

However, on the one hand, this method usually needs to consume a large amount of oxidant or energy, making the processing cost relatively high

On the other hand, due to the continuous decrease of the concentration of oxidants during the degradation process, and such polycyclic aromatic hydrocarbon pollutants need to consume a large amount of oxidants to be completely degraded, it is easy to lead to incomplete degradation of pollutants, which not only causes the value of COD not to drop Reverse rise will also cause the BOD value of the effluent to be less than 0.3, which will significantly reduce the efficiency of biochemical treatment, resulting in the COD concentration of the effluent not reaching the standard

In addition, this kind of tunic acid is usually expensive. If it is directly degraded, it will not only easily cause secondary pollution, but also cause resource loss.

Images