Method for treating wastewater with high hydroxybenzene contained through catalyzing wet oxidation

Abstract

A process for treating the phenol contained sewage by catalytic wet oxidizing method features that its catalyst is prepared from the active component chosen from Pt, Pd, Rh and Ru, the auxiliary component chosen from La, Ce, Pr and Nd, and TiO2-ZrO2 carrier through baking at 60-180 deg.C for 2-18 hrs and calcining at 300-800 deg.c for 2-18 hrs. It is applied under the conditions: 220-280 deg.C for reaction temp, 4-8 MPa for pressure, 50-300 for air / water ratio, and 0.5-6 / hr for space speed. Its advantages are high reaction efficiency, high removal rate of COD up to 99%, and high BOD5 / CODcr increased from 0.02 to 0.6.

Description

technical field [0001] The invention relates to the treatment of high-phenol-containing wastewater, in particular to a method for catalytic wet oxidation treatment of high-phenol-containing wastewater. The process of the present invention is also suitable for treating other similar high-concentration and refractory industrial organic wastewater. Background technique [0002] The wastewater produced in the production of phenolic resin, explosives, rubber and other chemical processes not only has a high COD value, but also contains a large amount of phenolic substances. Denaturation, high concentration can cause protein precipitation; phenol has direct damage to various cells, and has a strong corrosive effect on skin and mucous membranes; in addition, phenol has a great impact on aquatic organisms, and low concentration phenol pollutes water, which can affect fish When the concentration is high, a large number of fish can be killed; the use of phenolic wastewater to irrigate...

AI Technical Summary

Problems solved by technology

In the experiment of anaerobic treatment of coking wastewater, researchers found that cresol and xylenol in coking wastewater can inhibit anaerobic microorganisms. Therefore, anaerobic treatment generally adopts granular activated carbon (GAC) filter bed or fluid flow. Chemical bed, GAC expanded bed, etc. Most of the inhibitory organic substances in wastewater are first adsorbed on GAC, thereby reducing the inhibitory effect on anaerobic microorganisms. The main problem of using this method to treat wastewater is: the removal rate of COD and TOC is not high, Generally around 70%; GAC saturation is faster, the use cycle is short, regeneration is also difficult, and the processing time is longer, etc.

[0004] The chemical method is to add chemical oxidants to the wastewater to decompose organic matter such as phenol, and at the same time to oxidize the reducing substances in the water. Commonly used chemical oxidants include ozone, hydrogen peroxide, potassium permanganate, etc. In a humid environment, yellow phosphorus It can undergo branching reaction with oxygen to generate a large amount of O, O 3 , PO, PO 2 and other active substances, they can degrade and destroy pollutants (Chang, S.G., Environ.Prog., 11: 66, 1992); under suitable reaction conditions, the removal rate of phenol can reach more than 95% (Miao Xiusheng, etc., China Environmental Science, 16 (5): 373, 1996). However, this method is mostly used for the treatment of low-concentration phenol-containing wastewater (<1000mg / L), and the chemical method adopted is only a low-level chemical oxidation method, and the treatment efficiency is low. complex

[0005] High phenolic wastewater is produced during the production of phenolic resin, and its COD value is as high as 2×10 4 mg / l, the content of free phenol is between 0.7-0.8%. Due to the high content of organic matter such as various phenols and aldehydes, there is no better treatment method at this stage