Advanced treatment method for Lurgi coal gasification wastewater

An advanced treatment and coal-to-gas technology, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of high cost and unreachable discharge of Lurgi furnace coal-to-gas wastewater Standards and other issues to achieve the effect of developed voids, increasing the concentration of available carbon sources and nitrogen sources, and reducing the occupied area

Active Publication Date: 2013-06-12
哈尔滨工创环保科技有限公司
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Problems solved by technology

[0003] The present invention aims to solve the problem that the advanced treatment of Lurgi furnace coal gas waste water cannot reach the discharge standard in the existing biochemical method, and the

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  • Advanced treatment method for Lurgi coal gasification wastewater

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specific Embodiment approach 1

[0013] Specific implementation mode one: this implementation mode is a kind of advanced treatment method of Lurgi furnace coal gasification waste water, specifically completes according to the following steps:

[0014] 1. Coagulation and adsorption treatment: firstly, the Lurgi furnace coal gasification wastewater is passed into the coagulation sedimentation tank, and then polyaluminum chloride, polyacrylamide, diatomite and powdered activated carbon are added, and the sludge reflux ratio is 50% ~100% and the stirring speed is 50r / s~70r / s under the condition of stirring for 4min~6min, and then under the condition of the sludge reflux ratio of 50%~100% and the stirring speed of 0.2r / s~0.5r / s The flocculation is 25min~35min; the dosage of polyaluminum chloride mentioned in step 1 is 80mg / L~100mg / L; the dosage of polyacrylamide mentioned in step 1 is 20mg / L~30mg / L ; The dosage of diatomite described in step 1 is 180mg / L~200mg / L; The dosage of powdered activated carbon described i...

specific Embodiment approach 2

[0024] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: the concentration of CODcr in the Lurgi furnace coal gasification wastewater described in step 1 is 150mg / L~250mg / L, NH 4 -N concentration is 40mg / L~80mg / L, phenol concentration is 10mg / L~20mg / L, quinoline concentration is 45mg / L~55mg / L, pyridine concentration is 3mg / L~4mg / L, no cyanide . Others are the same as the first embodiment.

specific Embodiment approach 3

[0025] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the dosage of polyaluminum chloride described in step 1 is 90 mg / L. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses an advanced treatment method for Lurgi coal gasification wastewater, relates to a sewage treatment method and aims to solve the problems that the discharged Lurgi coal gasification wastewater after being subjected to advanced treatment by using the traditional biochemical method still cannot meet the standard and a physic-chemical method is high in cost when being used for carrying out advanced treatment on the Lurgi coal gasification wastewater. The method comprises the following steps of: firstly, coagulation and absorption treatment; secondly, high-density sedimentation treatment; thirdly, advanced oxidation treatment; fourthly, continuous aeration and batch stirring treatment; fifthly, batch aeration biotreatment; and sixthly, V-shaped sand filter treatment to finish advanced wastewater treatment. The advanced treatment method has the advantage that the final effluent obtained through treating the Lurgi coal gasification wastewater by using the method provided by the invention can meet the recycling standard. The advanced treatment method is mainly used for advanced treatment of the Lurgi coal gasification wastewater.

Description

technical field [0001] The invention relates to a sewage treatment method. Background technique [0002] China's consumption of natural gas is increasing year by year. The shortage of domestic natural gas leads to an ever-increasing gap between supply and demand. The import of natural gas continues to increase, and the dependence on foreign countries reaches 30% to 35%. It is very necessary and urgent to develop the domestic natural gas industry. The Lurgi furnace is a mature pressurized coal gasification furnace technology. Due to its low gasification temperature (about 1000°C), low energy consumption, and less strict requirements on coal quality, it can synthesize a large amount of methane gas, and at the same time It can also obtain many commercial by-products, and it is currently the coal-to-gas technology with the largest number of plants in the world. Coal-to-natural gas consumes a lot of water, every 1000m produced 3 The water consumption of natural gas reaches 6-7 ...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 韩洪军方芳徐春艳赵茜张凌瀚贾胜勇侯保林庄海峰
Owner 哈尔滨工创环保科技有限公司
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