Method for combined treatment of wastewater of phenol-containing gas by ozone flocculant

A combined treatment and oxidation treatment technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. High level of pollutants and phenolic substances, to achieve the effect of good effluent quality, improved biodegradability, and high degree of automation

Active Publication Date: 2013-09-18
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the low biodegradability of SNG wastewater, the organic pollutants and phenolic substances i...

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  • Method for combined treatment of wastewater of phenol-containing gas by ozone flocculant

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Embodiment 1

[0033] A certain biochemical SNG wastewater is advanced treated by the ozone-dosing flocculation-biology combined process of the present invention. The COD of SNG wastewater after biochemical treatment is 220 mg / L, B / C 0.10, and phenol 73 mg / L. Firstly, ozone is introduced to carry out ozone oxidation treatment. The ratio of the dosage of ozone to the COD of SNG wastewater is 0.1:1, the oxidation treatment time is 10 minutes, and the pH is 8.0. After oxidation, the effluent flows into the primary storage tank and stays for 20 minutes. At this time, the COD of the wastewater is 200 mg / L, B / C 0.32, and phenol is 35 mg / L; the effluent from the primary storage tank is subjected to chemical dosing and flocculation reaction, and the aluminum-containing compound chemical is added, and the mass ratio of the chemical dose to the wastewater is 0.005: 1. Control the pH to 8.5. At this time, the COD of the wastewater is 150mg / L; the flocculation effluent flows into the sedimentation tank,...

Embodiment 2

[0036]A certain biochemical SNG wastewater is advanced treated by the ozone-dosing flocculation-biology combined process of the present invention. The COD of SNG wastewater after biochemical treatment is 240 mg / L, B / C 0.12, and phenol 84 mg / L. Firstly, ozone is introduced to carry out ozone oxidation treatment. The ratio of the dosage of ozone to the COD of SNG wastewater is 0.15:1, the oxidation treatment time is 12 minutes, and the pH is 8.5. After oxidation, the effluent flows into the primary storage tank and stays for 25 minutes. At this time, the COD of the wastewater is 208mg / L, the B / C is 0.35, and the phenol is 35mg / L; the effluent from the primary storage tank is subjected to chemical dosing and flocculation reaction, and the aluminum-containing composite chemical is added, and the mass ratio of the chemical dose to the wastewater is 0.01:1 , control the pH to 8.5, at this time, the COD of the wastewater is 160 mg / L; the flocculation effluent flows into the sedimenta...

Embodiment 3

[0038] A certain biochemical SNG wastewater is advanced treated by the ozone-dosing flocculation-biology combined process of the present invention. The COD of SNG wastewater after biochemical treatment is 282 mg / L, B / C 0.15, and phenol 64 mg / L. Firstly, ozone is introduced to carry out ozone oxidation treatment. The ratio of the dosage of ozone to the COD of SNG wastewater is 0.2:1, the oxidation treatment time is 12 minutes, and the pH is 8.0. After oxidation, the effluent flows into the primary storage tank and stays for 30 minutes. At this time, the COD of the wastewater is 218 mg / L, the B / C is 0.37, and the phenol is 28 mg / L; the effluent from the primary storage tank is subjected to the dosing and flocculation reaction, and the aluminum-containing compound reagent is added, and the mass ratio of the dose to the wastewater is 0.02 : 1, control pH 8.6, at this moment, the COD of waste water is 148mg / L; The flocculation effluent flows into the sedimentation tank, after stayi...

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Abstract

The invention discloses a method for combined treatment of wastewater of a phenol-containing gas by an ozone flocculant. The method is characterized by comprising the following steps of: (1) oxidization treatment, namely carrying out oxidization treatment on synthetic natural gas (SNG) waste water by using ozone; (2) carrying out primary intermediate reservoir treatment; (3) carrying out flocculation dosing treatment, and feeding a compound agent containing aluminum; (4) carrying out precipitation reaction treatment; (5) carrying out secondary intermediate reservoir treatment; and (6) processing by a biological response processor, namely feeding the water from a secondary intermediate reservoir to a biological reaction tank, wherein the standing time of the biological response processor is 4-20 hours; processed water is recycled; biological sludge is domesticated by bottom mud of a sewage pool at scene; bacteria Bacuillus sp.JY01 capable of degrading phenol is added; the gene registration number is EU798946.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and relates to a method for ozone flocculation biological joint treatment of phenol gas waste water, and the treated effluent reaches the standard of zero discharge. Background technique [0002] Coal-based natural gas wastewater (hereinafter referred to as SNG wastewater) mainly comes from the coal gas washing, condensation and fractionation sections, and is the sewage of the water circulation system in the coal pressurized gasification system. Wastewater produced by gas plants is also quite different. It is characterized by extremely high pollutant concentration, dissolved or suspended various components in crude gas, not only high concentration of phenolic pollutants, but also a large amount of pollutants such as ammonia, cyanide and thiocyanate and many other pollutants. heterocyclic compounds and polycyclic aromatic hydrocarbons. [0003] Due to the low biodegradability of SNG wastewat...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 张艳芳霍莹郑贝贝滕厚开陈军张莹杨勇
Owner CHINA NAT OFFSHORE OIL CORP
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