Method for advanced treatment of wastewater by using combination of catalytic ozonation and internal circulation biological filter

Abstract

The invention discloses a method for the advanced treatment of wastewater. The method comprises the following steps of: 1) filtering off-standard wastewater, delivering the wastewater into a catalytic ozonation tower, and simultaneously adding ozone for contact oxidization reaction; 2) delivering the effluent of the catalytic ozonation tower into an oxidization buffer stabilization basin for stabilization; 3) and after the stabilization, delivering the effluent into a BAF basin for treatment, and delivering discharged water into a clean water basin. The method reduces the addition amount of the ozone, improves the utilization efficiency of the ozone, converts the ozone into hydroxyl radicals by using a metal catalyst, and reduces the activation energy of hydroxyl radical oxidation reaction to promote hardly biodegradable macromolecule organic substances in the wastewater to be oxidized into easily biodegradable micromolecule substances, so that the biochemical limit to refining the wastewater is broken through and the biodegradability of the wastewater is increased; and the water quality of the effluent can meet the provincial standard of Jiangsu province, namely Chemical IndustryMain Water Pollutant Discharge Standard, completely by further treatment in the BAF basin.

Description

technical field [0001] The invention relates to a method for advanced treatment of sewage by combining ozone catalytic oxidation and internal circulation biological filter. Background technique [0002] At present, most of the easily degradable organic substances in refinery wastewater are basically degraded and removed through long-term biochemical treatment. Refractory organics such as nitrogen-containing heterocycles and polycyclic aromatic hydrocarbons are basically not oxidized by organisms, and the biodegradation rate of soluble microbial products (SMP) produced during biochemical treatment is very slow. Therefore, the advanced treatment of oil refinery wastewater directly using biological methods obviously cannot achieve the expected results. At present, the more advanced domestic method is to use ozone oxidation and biological aeration filter technology to treat low-concentration refractory organic matter, but there is a problem that the dosage of ozone is too large....

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Problems solved by technology

Refractory organics such as nitrogen-containing heterocycles and polycyclic aromatic hydrocarbons are basically not oxidized by organisms, and the biodegradation rate of soluble microbial products (SMP) produced during biochemical treatment is very slow

Therefore, the advanced treatment of oil refinery wastewater directly using biological methods obviously cannot achieve the expected results. At present, the more advanced domestic method is to use ozone oxidation and biological aeration filter technology to treat low-concentration refractory organic matter, but there is a problem that the dosage of ozone is too large. large, low utilization rate, slow reaction speed, high energy consumption, and strong selectivity to organic matter. At the same time, the existing technology has not achieved the expected effect in improving the biodegradability of sewage water quality through ozone oxidation. Ozone Oxidation did not play the expected effect, did not oxidize the refractory macromolecular substances into easily degradable small molecular substances, and did not effectively improve the biodegradability of oligotrophic substances in the post-biochemical stage sewage, resulting in the failure of subsequent biochemical processes to perform as expected biodegradable

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