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Benzopyrene-containing wastewater treatment system and method

A treatment system, benzopyrene technology, applied in the field of benzopyrene-containing wastewater treatment system, can solve the problems of incomplete adsorption/desorption, frequent regeneration, low catalyst efficiency, etc., achieve small footprint, high-efficiency treatment, easy-to-use effects

Pending Publication Date: 2022-08-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the conventional ultraviolet photocatalytic heterogeneous reaction system, the adsorption and oxidative degradation of the catalyst are usually carried out in the same reactor, so there may be incomplete adsorption / desorption, which leads to problems such as low catalyst efficiency and frequent regeneration.

Method used

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  • Benzopyrene-containing wastewater treatment system and method
  • Benzopyrene-containing wastewater treatment system and method
  • Benzopyrene-containing wastewater treatment system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0168] The benzopyrene-containing wastewater to be treated is taken from the cold coke water of a coking plant in a refinery. Its COD is 1327 mg / L, the BOD is 290 mg / L, and the concentration of benzopyrene is 162.9 μg / L.

[0169] The wastewater containing benzopyrene to be treated enters the coagulation reaction tank, and the flocculant polyaluminum chloride 200mg / L, the coagulation aid anionic PAM 5mg / L, the residence time in the coagulation reaction tank is 0.5h, and the stirring time is 10min / h, the stirring speed is 30r / min, the filter element is made of PP cotton, the pore size is 1μm, and the adsorption-stabilization cell body is loaded with TiO 2 The OMS-2 molecular sieve (prepared by reflux roasting, trade name RUC-2) is used as a heterogeneous adsorbent, based on the total weight of the heterogeneous adsorbent, TiO 2 The load is 3% by weight, the particle size is 100 μm, and the dosage is 1.0 g / L. Hydrogen peroxide is used as a homogeneous catalyst in the first stati...

Embodiment 2

[0172] The wastewater containing benzopyrene to be treated was taken from the coking wastewater of a coking plant, and its COD was 861 mg / L, the BOD was 162.6 mg / L, and the concentration of benzopyrene was 84.3 μg / L.

[0173] The wastewater containing benzopyrene to be treated enters the coagulation reaction tank, and the flocculant polyaluminum chloride 100mg / L and the coagulant anionic PAM 6mg / L are added respectively. The residence time in the coagulation reaction tank is 0.625h, and the stirring time is 10min. / h, the stirring speed is 30r / min, the filter element is made of PP cotton, the pore size is 5μm, and the adsorption / stabilization cell body is loaded with TiO 2 OMS-2 molecular sieve as heterogeneous adsorbent, TiO 2 The loading amount is 3% by weight, the particle size is 100 μm, and the dosage is 1.0 g / L. In the first static mixer, sodium persulfate is used as a homogeneous catalyst, and the molar concentration ratio of the homogeneous catalyst to the benzopyrene ...

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Abstract

The invention relates to a system and a method for treating benzopyrene-containing wastewater. Along the flow direction of to-be-treated wastewater, the system comprises adsorption-stabilization units which are sequentially communicated with one another and are used for adsorbing benzopyrene in the to-be-treated wastewater by a heterogeneous adsorbent to obtain first mixed slurry containing the to-be-regenerated heterogeneous adsorbent; the static mixing unit is used for mixing the first mixed slurry with a homogeneous catalyst to obtain second mixed slurry; the oxidative degradation-desorption unit is used for carrying out desorption regeneration on the to-be-regenerated heterogeneous adsorbent and carrying out oxidative degradation reaction on desorbed benzopyrene to obtain third mixed slurry; and the purification-recovery unit is used for carrying out separation treatment on the third mixed slurry to obtain purified water. According to the system and the method provided by the invention, the advantages of a physical method and a chemical method can be fully exerted, and the benzopyrene-containing wastewater can be efficiently treated.

Description

technical field [0001] The present disclosure relates to the field of sewage treatment, and in particular, to a system and method for treating benzopyrene-containing wastewater. Background technique [0002] Benzopyrene, a polycyclic aromatic hydrocarbon composed of five benzene rings, has been listed as a priority pollutant in the environment due to its carcinogenicity, teratogenicity and acute toxicity. In the industrial production process, a large amount of benzopyrene is contained in the waste water and waste gas of carbon black, oil refining, coking, synthetic rubber, burning asphalt and other industries, which poses a huge threat to human health. In order to strictly control the entry of benzopyrene into the environment, the state has made strict restrictions and requirements on the discharge of benzopyrene in water in the discharge standards of related industries, such as the national standard "Coking Chemical Industry Pollutant Discharge Standard" and "Petroleum Refi...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/32
CPCC02F9/00C02F1/281C02F1/725C02F1/001C02F1/5236C02F2101/32Y02W10/37
Inventor 王辉杨春鹏赵锐王金华余正齐
Owner CHINA PETROLEUM & CHEM CORP
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