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Deep treatment process for coal-to-liquids wastewater

An advanced treatment and coal-to-oil technology, which is applied in the directions of water/sewage multi-stage treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of high operating costs, harsh conditions, and few applications. Achieve the effects of low operating cost, small footprint and good economic applicability

Inactive Publication Date: 2013-05-29
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, wet oxidation method, ultrasonic oxidation method, photocatalytic oxidation method, supercritical oxidation method, and electrochemical method have strict requirements and high operating costs, and are rarely used in wastewater treatment.

Method used

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  • Deep treatment process for coal-to-liquids wastewater
  • Deep treatment process for coal-to-liquids wastewater
  • Deep treatment process for coal-to-liquids wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A case of advanced treatment of coal-to-oil wastewater in Inner Mongolia. The advanced treatment process flow chart of coal-to-oil wastewater is as follows figure 1 shown.

[0020] The effluent of high-concentration coal-to-oil waste water is pumped into the adjustment unit through the water pump for homogeneity and equalization through the biochemical treatment. The acid and alkali metering pumps are linked with the pH meter to control the pH value of the influent water at 6.23, and assist mechanical stirring to maintain uniform water quality. The time is 2.1h; the outlet water of the adjustment unit is lifted by the pump to the filter unit to remove SS and insoluble COD in the wastewater. The filter material is made of high-grade quartz sand, and the filtration rate is controlled at 4m / h; the filtered water still has a certain pressure and directly enters the ozone oxidation Unit, during the oxidation reaction process, the ratio (mass ratio) of the dosage of ozone to...

Embodiment 2

[0024] In the adjustment unit, the metering pump is linked with the pH meter to control the pH value of the incoming water at 8.35, and the mechanical stirring is assisted to keep the water quality uniform, and the residence time is 4h; the filter material of the filter unit is fiber ball, and the filtration rate is controlled at 6m / h; the ozone oxidation unit Control the ratio (mass ratio) of the dosage of ozone to the total amount of COD in the ozone oxidation water to be 1.2:1, and the reaction time is 1.2h; the deeply oxidized effluent enters the product pool, and the water quality in the pool is linked with the pH through the metering pump to control the pH value of the product water at 7.67, residence time 4h. All the other are identical with embodiment 1, and concrete treatment effect is shown in table 2.

[0025] Attached Table 2 Advanced treatment results of a certain coal-to-oil wastewater in Inner Mongolia 2

[0026]

Embodiment 3

[0028] In the adjustment unit, the metering pump is linked with the pH meter to control the pH value of the incoming water at 9.87, and the mechanical stirring is assisted to keep the water quality uniform, and the residence time is 12 hours; the filter material of the filter unit is filtered by a microfiltration filter element; the ozone oxidation unit controls the dosage of ozone The total ratio (mass ratio) of COD in the ozone oxidation water is 4:1, and the reaction time is 2.8 hours; the deeply oxidized water enters the product pool, and the water quality in the pool is linked with the pH through the metering pump to control the pH value of the product water at 7.81, and the residence time is 8 hours. All the other are identical with embodiment 1, and concrete treatment effect is shown in table 3.

[0029] Attached Table 3 Advanced treatment results of a certain coal-to-oil wastewater in Inner Mongolia 3

[0030]

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Abstract

The invention discloses a deep treatment process for coal-to-liquids wastewater, and the process flow is as follows: water discharge after coal-to-liquids wastewater is subjected to biochemical treatment and passes through a regulating unit, a filtering unit, a deep oxidation unit, a product pond, and water discharging is carried out. According to the process, organic matters and biological metabolic products which are difficult to be biodegraded in biochemical discharged water of coal-to-liquids wastewater can be quickly oxidized, and chromophoric groups can be destroyed, thereby improving the biodegradability of wastewater, and improving the stability and reliability of up-to-standard release and reclaimed water reuse; and the deep treatment process disclosed by the invention is less in investment, low in running cost, small in land-occupied area and short in treatment cycle, has a remarkable decolorization effect on wastewater, and does not cause secondary pollution, therefore, the process has good spreading and application prospects.

Description

technical field [0001] The invention relates to an advanced treatment process for coal-to-oil wastewater, in particular to a water treatment process that uses ozone oxidation to degrade high-concentration coal-to-oil wastewater and biochemically treats pollutants in the water, and improves biodegradability, which belongs to coal-to-oil Wastewater deep purification treatment field. Background technique [0002] In recent years, with the rapid development of my country's economy, the demand for oil is increasing day by day. However, my country is a country rich in coal and low in oil, and most of the oil is imported. Faced with rising oil prices, oil safety has become a huge test for our country. Coal-to-oil uses coal as raw material to produce oil products and petrochemical products through chemical processing, which can solve the plight of my country's oil shortage. Coal-to-liquids technology includes direct liquefaction and indirect liquefaction of coal. The production pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/66C02F1/78
Inventor 徐炎华陆曦孙文全胡俊
Owner NANJING TECH UNIV
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