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Method for treating coal gas wastewater by adopting nitrogen floating device

A coal-to-gas and wastewater technology, applied in flotation water/sewage treatment, etc., can solve the problems of decreased biological treatment efficiency, strong microbial toxicity, and deepening of wastewater color, so as to reduce the operating cost of the method, improve the treatment efficiency, and reduce the load Effect

Inactive Publication Date: 2011-05-11
HARBIN INST OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional air flotation method still has major defects in the oil removal process of coal gas wastewater, because the air flotation process mostly uses air as the gas source, and coal gas wastewater contains more easily oxidizable substances such as phenols, which are mixed with air After the oxygen contact reaction, some easily oxidizable substances will be oxidized, which not only causes the color of the wastewater to deepen, but also increases the toxicity of the oxidized substances to microorganisms, which easily leads to a decline in the efficiency of biological treatment

Method used

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  • Method for treating coal gas wastewater by adopting nitrogen floating device
  • Method for treating coal gas wastewater by adopting nitrogen floating device
  • Method for treating coal gas wastewater by adopting nitrogen floating device

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specific Embodiment approach 1

[0011] Specific implementation mode one: combine figure 1 Describe this embodiment, the method of this embodiment comprises the following steps: step 1, waste water is divided into first part and second part, and the volume of first part accounts for 5%-50% of total waste water, and first part waste water is added through booster pump 1 After pressure, it is sent to the pressure dissolving tank 2, the nitrogen gas source enters the pressure dissolving tank 2, and the surface load of nitrogen is 2-6m 3 / m 2 h; step 2, under the action of pressure in the pressure dissolved air tank 2, nitrogen is dissolved in the waste water, and the waste water dissolved with nitrogen enters the air flotation pool 3 after being discharged from the pressure dissolved air tank 2; Step 3, dissolves in the air flotation pool 3 The pressure of the wastewater containing nitrogen is released, and the supersaturated nitrogen dissolved in the wastewater is released in the form of tiny bubbles, forming ...

specific Embodiment approach 2

[0013] Specific implementation mode two: in step two of the present embodiment, aluminum trichloride can be dropped into the air flotation tank 3, and the input amount is 1-100 mg / L, and this step can play the role of filtering waste water. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0014] Specific implementation mode three: combination figure 2 Illustrate this embodiment, the method of this embodiment comprises the following steps: Step 1, waste water enters the bottom of air flotation tank 3, and waste water ascending flow rate is 1-2mm / s, and hydraulic retention time is 10-60min, and nitrogen is added through gas compressor 4 Pressure, compressed nitrogen escapes from the surface of the diffusion plate or diffusion tube 3-1 arranged at the bottom of the air flotation tank 3 in the form of tiny bubbles, and the surface load of nitrogen is 2-6m 3 / m 2 h; step 2, after the waste water in the air flotation tank 3 fully contacts the tiny bubbles formed at the bottom of the air flotation tank 3, the dispersed oil pollutants suspended in the waste water adhere to the surface of the tiny bubbles, forming composite particles with a density smaller than water Step 3: Under the action of buoyancy, the composite particles rise to the liquid surface with the air ...

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Abstract

The invention discloses a method for treating coal gas wastewater by adopting a nitrogen floating device, relating to a method for treating coal gas wastewater. The invention aims to solve the problem that air is used a gas source when coal gas wastewater is treated with a floating method currently, which causes the deep color of the wastewater to easily generate oxides which affect the following biochemical treatment. In the first technical scheme, nitrogen is dissolved into wastewater and enters a floating tank; supersaturated nitrogen is released in a form of tiny bubbles and mixed with a second part of water, and dispersed oil pollutant in the wastewater is adhered to the surfaces of the tiny bubbles to form composite particles; and the composite particles are scraped by a slag scraping machine. The second technical scheme is characterized in that compressed nitrogen escapes from the surface of a diffusion plate or a diffusion tube arranged at the bottom of the floating tank in a form of tiny bubbles. The third technical scheme is characterized in that the upper space of the floating tank is kept at normal pressure, the nitrogen dissolved in the wastewater reaches a saturated or supersaturated state, and the upper space of the floating tank is in a vacuum state through a vacuum pump. The method is used for treating coal gas wastewater.

Description

technical field [0001] The invention relates to a method for treating coal-gas wastewater, in particular to treating oil pollutants in coal-gas wastewater. Background technique [0002] The coal-to-gas industry has many and complicated production processes, and produces a large amount of wastewater with complex water quality, among which high-concentration coal gas washing wastewater is the main one. Coal-to-gas wastewater contains easily degradable organic substances such as phenolic compounds and benzene compounds, degradable organic substances such as arsenic, naphthalene, furan, and imidazole, and refractory organic substances such as pyridine, carbazole, biphenyl, and oil. , and containing inorganic pollutants such as cyanide, sulfide, ammonia nitrogen, etc., is a typical high-concentration toxic, harmful, and refractory to biodegradable industrial wastewater. [0003] At present, the treatment technologies of coal gasification wastewater follow the process route of pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/24
Inventor 韩洪军王伟徐春艳李慧强马文成张凌翰庄海峰袁敏
Owner HARBIN INST OF TECH
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