Coal upgrading wastewater treatment process

Abstract

The invention relates to a coal upgrading wastewater treatment process and belongs to the technical field of wastewater treatment. Aiming at the characteristics that the coal upgrading wastewater is high in content of suspended solids, difficult in settling, rich in degradation-resistant organic matters even toxic and harmful materials, high in chromaticity, and the like, the wastewater is firstly subjected to oil-removing and sand-conditioning treatment to remove most of suspended solids and oil in the wastewater, so that the impact to a subsequent biochemical system is reduced; the biochemical system comprises an anaerobic tank and an aerobiotic tank, and can further comprises an oxygen-deficient tank, wherein most of pollutants are removed in a biochemical treatment phase, and then the wastewater is disinfected through ozone oxidation, decolored, and subjected to removal of the degradation-resistant pollutants so as to reach the emission standard, and can also be recycled through a film desalting system. The coal upgrading wastewater treatment process provided by the invention has the characteristics of high process applicability, good removing effect special for pollutants, easiness for operation and great impaction resistance capacity.

Description

technical field [0001] The invention relates to a coal upgrading wastewater treatment process, which belongs to the technical field of wastewater treatment. Background technique [0002] Due to the over-exploitation and utilization of bituminous coal and anthracite in the world, the resource utilization of lignite, a mineral coal with low degree of coalification, has attracted more and more attention. The coalification degree of lignite is between peat and bituminous coal, and it is characterized by high volatile matter, high water content, high oxygen content, and rich humic acid. Due to its high oxygen content and water content, lignite has a low calorific value and is easy to weather and deteriorate in the air, which is not conducive to long-distance transportation and storage. It is generally used as a fuel for power generation. However, direct combustion of lignite for power generation has low thermal efficiency and large greenhouse gas emissions, making it difficult t...

AI Technical Summary

Problems solved by technology

In CN102358649A, a flocculation-adsorption treatment process is disclosed, the steps of which are to adjust the pH of waste water, then carry out flocculation precipitation, then use the upgraded lignite as an adsorbent for adsorption, and finally remove pollutants through activated carbon adsorption. The advantage of the patent is that the process flow is short and the operation is simple, but the process only transfers the pollutants without degradation, and the pollutants still exist after the adsorbent is desorbed; in addition, the process needs to repeatedly adjust the pH value, which increases the consumption of chemicals

CN102506575A uses the incineration technology to process the steam-containing waste gas produced in the lignite upgrading process, and recycles the steam condensed water after treatment. The process is characterized by simple equipment and low treatment cost. The disadvantage is that the steam takes away a large amount of heat during the incineration process. The utilization rate of heat energy is bound to be lost; in addition, after the incineration steam condenses, the water will contain certain pollutants and cannot be discharged outside.

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