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Combined treatment method of phenol-containing coal gas wastewater

A treatment method, coal-to-gas technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the difficulties of large-scale use of treatment technology, COD is difficult to meet standards, and operating costs Advanced problems, to achieve the effect of improving the reaction rate of catalytic oxidation, stabilizing the quality of effluent water, and saving costs

Active Publication Date: 2015-07-08
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low biodegradability of coal-to-gas wastewater, the effluent from biological treatment still has a deep chroma, and COD is difficult to meet the standard. Although advanced oxidation and other physical and chemical methods can achieve better treatment effects, their operating costs are high. Complex and potentially dangerous operations make these treatment techniques difficult to single-handedly use on a large scale

Method used

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  • Combined treatment method of phenol-containing coal gas wastewater
  • Combined treatment method of phenol-containing coal gas wastewater
  • Combined treatment method of phenol-containing coal gas wastewater

Examples

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Effect test

Embodiment 1

[0039] According to the process described in the present invention, a certain phenol-containing coal gas production wastewater is treated, and the reaction conditions are as follows: first, the wastewater enters the premixing device, the ozone dosage is 69mg / L, and the residence time is 8 minutes; the premixed water enters the ozone catalytic oxidation treatment system , the dosage of ozone is 165mg / L, pH9, and the residence time is 16 minutes; the effluent is separated by gyromagnetic dosing, and the aluminum-containing composite agent is polyaluminum ferric sulfate, and the main component of the polymer flocculant is polyacrylamide; The dosage is 1.8%, 0.008%, pH8, and the residence time is 40 minutes; the effluent treated with the drug enters the biological treatment system, the gas-water ratio is 16:1, and the residence time is 20hr. After treatment, indicators such as COD meet the requirements for discharge or reuse, see Table 1:

[0040]

Embodiment 2

[0042] According to the process of the present invention, a certain phenol-containing coal gas production wastewater is treated, and the reaction conditions are as follows: first, the wastewater enters the premixing device, the ozone dosage is 50 mg / L, and the premixing reaction time is 8 minutes; the premixed water enters the ozone catalytic oxidation Treatment system, the dosage of ozone is 100mg / L, and the reaction time is 15 minutes; the effluent is separated by gyromagnetic dosing, adding 2.0% of aluminum-containing compound agent, 0.01% of polymer flocculant, etc., and the residence time is 30 minutes; dosing treatment The effluent enters the biological treatment system with a gas-water ratio of 20:1 and a residence time of 26hr. After treatment, indicators such as COD meet the requirements for discharge or reuse, see Table 2:

[0043]

Embodiment 3

[0045] According to the process described in the present invention, a certain phenol-containing coal gasification wastewater is treated, and the reaction conditions are as follows: first, the wastewater enters the premixing device, the dosage of ozone is 80mg / L, and the reaction time is 10 minutes; the premixed water enters the ozone catalytic oxidation treatment system , the dosage of ozone is 180mg / L, and the reaction time is 12 minutes; the effluent is separated by gyromagnetic dosing, adding 1.2% of aluminum-containing compound agent, 0.002% of polymer flocculant, etc., and the residence time is 60 minutes; Biological treatment system, the gas-water ratio is 25:1, and the residence time is 18hr. After treatment, indicators such as COD meet the requirements for discharge or reuse, see Table 3:

[0046]

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Abstract

The invention discloses a combined treatment method of phenol-containing coal gas wastewater. The combined treatment method is characterized by comprising the following steps: (1), carrying out pre-aeration on phenol-containing wastewater by utilizing a pre-mixing process, wherein ozone dosage is 50mg / L-100mg / L, and the retention time is 5-10 minutes; (2), carrying out zone catalytic oxidization treatment on the phenol-containing coal gas wastewater by utilizing ozone, wherein the ozone dosage is 100-200mg / L, the pH is 8-10 and the retention time is 10-20 minutes; (3), adding the coal gas wastewater catalyzed and oxidized by ozone into a gyromagnetic dosing separating system, and adding aluminum-containing composite medicaments, a high polymer flocculating agent, and the like, wherein the medicament dosage is respectively 0.5%-5%, 0.001%-0.05%, the pH is 7.5-9 and the retention time is 30-60 minutes; (4), adding the wastewater of the gyromagnetic dosing separating system in an FT biological and chemical treatment process, wherein the retention time of the reaction treatment system is 15-30 ours, the gas-water ratio is controlled to (10:1)-(30:1), and the treated outlet water is exhausted or recycled after reaching standards.

Description

technical field [0001] The invention relates to a coal-gas wastewater treatment technology, in particular to a combined treatment method for phenol-containing coal gas wastewater treatment, and the treated effluent reaches the zero discharge standard. Background technique [0002] The composition of coal-gas wastewater is complex, the concentration of pollutants is high, and it contains a variety of biodegradable organic substances. At present, the traditional biological treatment method is still the core process of coal-gas wastewater treatment, with strong processing capacity, few influencing factors and easy operation. Simple and other advantages. However, due to the low biodegradability of coal-to-gas wastewater, the effluent from biological treatment still has a deep chroma, and COD is difficult to meet the standard. Although advanced oxidation and other physical and chemical methods can achieve better treatment effects, their operating costs are high. Complex and pote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 盛金鹏霍莹于广欣张艳芳崔德春张莹纪钦洪郑贝贝杨勇付连超
Owner CHINA NAT OFFSHORE OIL CORP
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