A method of using coal powder as an adsorbent for coal liquefaction wastewater and printing and dyeing wastewater

A printing and dyeing wastewater and coal liquefaction technology, which is applied to chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of frequent regeneration operations, limited sources, and the need for regeneration, and achieve stable treatment effects and raw materials Wide range of sources and reduction in processing costs

Inactive Publication Date: 2016-03-16
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for special industrial wastewater such as printing and dyeing, coal liquefaction, etc., there are problems such as large amount of activated carbon, high cost, and frequent regeneration operations. These factors also make activated carbon more widely used in advanced wastewater treatment.
Activated coke also has strong adsorption capacity and is used in wastewater and waste gas treatment. However, as an industrial product, it also has problems such as limited sources, high prices, and the need for regeneration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: A coal-to-oil plant produces high-concentration organic wastewater, which is adjacent to a supporting coal-to-oil coal preparation plant.

[0021] The coal slime produced by the coal-to-oil coal preparation plant has a particle size of less than 0.5mm and an ash content of 12%. Introduce the high-concentration organic wastewater from the coal-to-oil plant, add dry coal slime in an amount of 5kg per cubic water, stir and fully disperse the coal slime particles, and the coal-water contact time lasts for 25 minutes. After that, the coal-water mixture is separated by centrifugation, and the obtained water continues to enter the subsequent Coagulation treatment and secondary biochemical treatment operations.

[0022] Raw water: COD Mn That is, the COD value measured by potassium permanganate is 5840mg / L, and the BOD 5 / COD value is 0.13, where BOD 5 Characterize the content of organic matter that can be degraded by microorganisms in water measured within 5 days...

Embodiment 2

[0024] Embodiment 2: Wastewater from a certain printing and dyeing factory

[0025] Take the clean coal product of a coal preparation plant, grind it until the particle size is less than 0.5mm, and the ash content is 9.5%. Take the wastewater from the printing and dyeing factory after pretreatment and secondary biochemical treatment, and add coal powder in an amount of 8kg coal powder per cubic water. Fully stir and disperse the coal powder particles for 30 minutes, after which the coal and water are separated, and the obtained water is discharged into the coagulation and sedimentation treatment link and the membrane bioreactor.

[0026] Coal pulverized water adsorption: COD Mn It is 510mg / L, the color is blue-black, and the chromaticity is 810 times, and the described chromaticity is the dilution factor.

[0027] Water after adsorption: COD Mn It is 297mg / L, and the chromaticity is 120 times.

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Abstract

The invention discloses a method for utilizing pulverized coal as a coal liquefaction wastewater and printing and dyeing wastewater adsorbent, belonging to a wastewater treatment method. The method comprises the steps of selecting the pulverized coal with the particle size less than 0.5mm as an adsorbent, and adding the adsorbent into the wastewater according to an amount of 5-8kg / m<3>; after the pulverized coal is sufficiently dispersed in the water for 20-30min, performing solid-liquid separation. According to the method, hardly degradable substances in the wastewater are removed by use of the natural absorbability of the coal against hydrophobic organic substances, oil substances and color developing substances, the biodegradability of the wastewater is improved, and the pulverized coal after the adsorption still can be used as fuel. For the hardly degradable substances such as hydrophobic organic substances, oil substances and color developing substances, the utilization of active carbon, active coke and the like as an adsorbent has the problems such as high cost, regeneration, narrow source range and the like; the treatment technologies such as advanced oxidation, microelectrolysis and the like have the problems such as waste of power consumption, high cost, difficulty in management and the like. The method disclosed by the invention has the characteristics of wide source of raw materials, low operation cost, stable treatment effect, simplicity and easiness in implementation and the like.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for using coal powder as an adsorbent for coal liquefaction wastewater and printing and dyeing wastewater treatment. Background technique [0002] Coal liquefaction wastewater, such as high-concentration organic wastewater produced during the coal-to-oil process, contains refractory organic pollutants such as oily substances, hydrophobic organic substances, and chromogenic substances. After adopting conventional pretreatment techniques such as air flotation, coagulation, and anaerobic biological treatment, the COD (chemical oxygen demand, an index representing the content of total organic matter in water) and chromaticity contributed by these substances are still high, and some substances It has microbial toxicity, which directly leads to the poor effect of subsequent biochemical treatment, and it is difficult for the effluent to meet the discharge or reuse standards. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28B01J20/20
Inventor 张明青刘炯天刘颀
Owner CHINA UNIV OF MINING & TECH
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