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A method for quickly removing organic pollutants from coal gasification wastewater

A technology of organic pollutants and coal-to-gas, applied in water pollutants, chemical instruments and methods, biological water/sewage treatment, etc., can solve problems such as high operating costs, foam problems, and complex equipment

Active Publication Date: 2020-07-03
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The equipment used in the air flotation method is relatively complicated, the operating cost is high, and it is easy to cause serious foam problems; while the flocculation method needs to add a large amount of polyaluminum chloride (PAC) coagulant and polyacrylamide (PAM). There are also the problems of large amount of chemical reagents and high pollution

Method used

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  • A method for quickly removing organic pollutants from coal gasification wastewater
  • A method for quickly removing organic pollutants from coal gasification wastewater
  • A method for quickly removing organic pollutants from coal gasification wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The mixed salt-loving / halo-tolerant flora used in Example 1 was derived from the high-salt brine in the crystallization pool of the Tanggu Salt Field in Binhai New Area, Tianjin. The collection steps of the flora are as follows:

[0019] (1) Bacteria enrichment: Collect an appropriate amount of high-salt brine and inoculate it into 2216E medium with a NaCl concentration of 300g / L, culture at a constant temperature and shake at 37°C for 7 days, and enrich to obtain mixed halophilic / halal-tolerant flora 1.

[0020] (2) High-salt osmotic-resistant culture: Inoculate the mixed flora 1 in 2216E medium with a NaCl concentration of 100-250g / L to continue the osmotic-resistant culture, and obtain a mixed flora of salt-loving / halal-tolerant after 7 days of constant temperature shaking culture at 37°C 2.

[0021] The NaCl concentration of the medium in this step is lower than that of step (1), the purpose is to further enrich and obtain a mixed flora with a faster growth rate, a...

Embodiment 2

[0031] The pure strains of halophilic / halophilic bacteria selected in Example 2 were derived from the high-salt brine in the salt pond of Daqing River Salt Field in Changlu, Hangu, Tianjin. The specific isolation and purification steps of the strain are as follows:

[0032] (1) The collected high-salt brine was used to carry out the enrichment of the bacterial flora and the high-salt osmotic culture, the method was exactly the same as that of Example 1, and the mixed bacterial flora 3 of the halophilic / halophilic and tolerant was obtained through enrichment and culture.

[0033] (2) Isolation of pure bacterial strains: Take 1 mL of the bacterial solution of mixed flora 3, dilute it 10, 100, 500, 1000, 2000 times respectively, and spread it on a 2216E solid plate with a NaCl concentration of 15%, seal the plate and place it upside down After culturing in a 37°C incubator for several days, select a plate with uniform distribution of colonies, pick a single colony and place it in...

Embodiment 3

[0046] Use strain 2 as bacterial agent to pretreat wastewater, mainly including dephenolization and oil removal (that is, removal of organic pollutants such as aromatic compounds, heterocyclic compounds, and petroleum hydrocarbons in water). Strain 1 was subjected to high-salt osmotic culture for a period of time before being released, and the method was the same as in Example 2. Pretreatment takes place in sedimentation tanks. Such as image 3 As shown, when the wastewater enters the sedimentation tank from the water inlet 1, the bacterial agent is continuously input from the branch feeding port 2 on the side of the water inlet 1 (it can also be added directly from the top of the pool through the sprayer), and the amount of the bacterial agent added is 8g. / L, after the pool is filled with water, let it stand for 20-40 minutes. After the sedimentation is complete, the treated wastewater is discharged from the water outlet 3, and the sediment is discharged from the mud discha...

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Abstract

The invention discloses a method for rapidly removing organic pollutants in coal gas wastewater. The method basically comprises the following steps: (1) selecting strains or mixed flora of halophilic / halotolerant bacteria capable of generating compatible solutes to carry out osmosis-resistant culture under a high-salt environment; (2) centrifugally collecting thalli, putting the thalli into the coal gas wastewater, and carrying out standing until floccules in the wastewater are completely settled to finish the removal of the organic pollutants. According to the method, the pollutants are rapidly separated and removed due to an adsorption effect between the compatible solutes extracellularly released by the thalli and molecules of the organic pollutants (mainly comprising a polycyclic aromatic compound, a heterocyclic compound and petroleum hydrocarbon) and by virtue of the rapid flocculation and sedimentation of the thalli serving as particle frameworks, and the method has the advantages of high speed, high efficiency and no pollution.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a method for quickly removing organic pollutants in coal gasification wastewater. Background technique [0002] At present, coal is still the main source of energy consumption in my country. Compared with the direct combustion utilization method, the coal-to-gas technology has less environmental pollution, and its adaptability to coal quality is strong, and the efficiency of resource conversion and utilization is high. However, the production process using this technology will produce highly polluted, difficult to biodegrade, toxic and harmful coal-to-gas wastewater. There are many kinds of organic pollutants in coal gasification wastewater and their chemical composition is complex. In particular, it contains a large amount of polycyclic aromatic compounds, heterocyclic compounds, petroleum hydrocarbons and other toxic organic substances that have a strong inhibito...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F101/30
CPCC02F3/34C02F2101/30
Inventor 朱大玲秦乐宁侍亚敏项军唐娜潘光华
Owner TIANJIN UNIV OF SCI & TECH
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