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

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...

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.