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System and method for treating high-concentration sewage generated by directly liquefying coal

A sewage treatment method, a technology of direct coal liquefaction, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. problems such as large water volume to achieve the effect of improving the treatment effect

Active Publication Date: 2013-08-28
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Due to the large amount of sewage discharged from the direct coal liquefaction plant, the concentration is high, and the composition is complex, the original biochemical treatment system cannot achieve the expected operating results, because the biochemical treatment system has poor impact resistance, low COD degradation rate, and nitrification and reaction. Nitrification reaction is difficult to establish, ammonia nitrogen cannot be removed

Method used

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  • System and method for treating high-concentration sewage generated by directly liquefying coal
  • System and method for treating high-concentration sewage generated by directly liquefying coal
  • System and method for treating high-concentration sewage generated by directly liquefying coal

Examples

Experimental program
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Effect test

Embodiment 1

[0092] The treated coal direct liquefaction high-concentration wastewater comes from the coal liquefaction and hydro-upgrading equipment of the Ordos Coal-to-Liquid Branch of Shenhua Group; its composition is shown in Table 3.

[0093] Table 3 Composition of high-concentration sewage from direct coal liquefaction (unit mg / L)

[0094]

[0095] The gasification cyanide-containing wastewater comes from a coal hydrogen production unit; its composition is shown in Table 2. The vortex air flotation machine is produced by McWong Company.

[0096] Directly liquefy the high-concentration sewage through the pump and pressurize it into the vortex air flotation machine, add 100mg / L polyaluminum chloride (PAC) and 60mg / L polyacrylamide (PAM) at the water inlet and make it and The sewage is fully reacted and then enters the air flotation separation section for treatment. In the air flotation separation section, the micro-bubbles absorb the oil droplets and hold up the oil droplets to achieve the...

Embodiment 2

[0116] Except that the sewage from the homogenization tank is introduced into the acidification tank, and then the pH value is adjusted to 6.5 by adding hydrochloric acid; the sewage from the anaerobic biochemical tank is adjusted to 7.5 by adding hydrochloric acid through the acid pump; The sewage in the oxygen biochemical tank was adjusted to pH 7.5 by adding sodium carbonate via an alkali pump, and the same method as in Example 1 was used to treat the high-concentration sewage directly with coal liquefaction. As a result, the product water obtained completely meets the standard for reuse.

Embodiment 3

[0118] Except that the sewage from the homogenization tank is introduced into the acidification tank, and then the pH value is adjusted to 6.0 by adding a mixture of hydrochloric acid and sulfuric acid; the sewage from the anaerobic biochemical tank is added through an acid pump to add a mixture of hydrochloric acid and sulfuric acid to adjust the pH The value is adjusted to 7.0; the sewage from the facultative aeration biochemical tank is added with a mixture of sodium carbonate and sodium hydroxide with a weight ratio of 100:1 through an alkali pump to adjust the pH to outside of 8.0, using the same method as in Example 1. Treat coal directly to liquefy high-concentration sewage. As a result, the product water obtained completely meets the standard for reuse.

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Abstract

The invention relates to a system for treating high-concentration sewage generated by directly liquefying coal. The system comprises a cavitation air flotation machine, a priming reservoir and a homogenizing tank which are sequentially connected, as well as an anaerobic biochemical pool, a facultative biochemical pool, an aerobic biochemical pool, an activated carbon adsorption tank, a coagulation reaction tank, a coagulative sendimentation tank, a filtering priming reservoir and a filtering adsorption tank which are sequentially connected, wherein an acidification pool is arranged between the homogenizing tank and the anaerobic biochemical pool; the homogenizing tank, the acidification pool and the anaerobic biochemical pool are sequentially connected; an acidification device is arrangedbetween an anaerobic biochemical pool outlet and a facultative biochemical pool inlet; and an alkalization device is arranged between a facultative biochemical pool outlet and an aerobic biochemical pool inlet. The invention also relates to a method for treating the high-concentration sewage generated by directly liquefying the coal. After the sewage generated by directly liquefying the coal is treated by the system and the method for treating the high-concentration sewage generated by directly liquefying the coal, the treatment effect of the high-concentration sewage generated by directly liquefying the coal can be remarkably improved and all product water reaches the standard and can be recycled.

Description

Technical field [0001] The invention relates to a sewage treatment system and a treatment method. More specifically, the present invention relates to a high-concentration sewage treatment system and treatment method. Background technique [0002] The Ordos Coal-to-Liquid Branch of Shenhua Group has the world's first large-scale industrialized coal direct liquefaction production plant for oil products. Direct coal liquefaction technology has attracted worldwide attention in recent years. The wastewater discharged from the direct coal liquefaction plant of the coal liquefaction plant has a large volume, high concentration, and complex composition. There is no similar wastewater treatment experience at home and abroad to learn from. [0003] The existing high-concentration sewage treatment system of the coal liquefaction plant adopts the "immobilized high-efficiency microbial sewage treatment process". The structure of the system is shown in figure 1 . [0004] The oil content in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 郝孟忠范树军张泽南
Owner CHNA ENERGY INVESTMENT CORP LTD