Technology and system for processing wastewater generated during brown coal upgrading process

Abstract

The technology for processing wastewater generated during the brown coal upgrading process comprises the following steps: cooling the wastewater, adding a positive flocculant so as to form precipitable solid particles during the cooling process of wastewater, stirring to homogenize the water quality; adding a flocculant and a coagulant aid into the wastewater to carry out re-agglomeration after the wastewater reaches the room temperature, subjecting the wastewater to processes of separation, filtration, and adsorption so as to remove almost all micro impurities in wastewater; introducing the processed wastewater into a biological reaction tank, carrying out bio-degradation on the organic matters and nitric pollutants in the wastewater by utilizing a microorganism membrane in a biological filling material; introducing part of the water in the biological reaction tank into a membrane separation tank, withholding all biomass in the wastewater in the membrane separation tank through a membrane separating member arranged in the membrane separation tank; refluxing the water, which is held back by the membrane separating member and contains nitrifying bacteria, to the biological reaction tank; adding sodium hypochlorite into the water filtered by the membrane separating member so as to disinfect the water, and finally introducing the disinfected water into a clean water tank.

Description

technical field [0001] This invention relates to the technical field of wastewater treatment, and specifically relates to a treatment process and a treatment system for wastewater produced during lignite upgrading. Background technique [0002] The degree of coalification of lignite is between peat and bituminous coal, with high water content, easy weathering, and easy spontaneous combustion. Because of these characteristics, lignite raw coal is not conducive to long-distance transportation and storage, and the thermal efficiency of direct combustion of lignite is low. Greenhouse gas emissions The amount of lignite is also very large, and it is difficult to develop and utilize it on a large scale. Therefore, lignite must be effectively upgraded in order to be more conducive to utilization, transportation and storage. [0003] The hot-pressed steam upgrading process can remove most of the moisture in the lignite, and the emission of greenhouse gases generated after lignite co...

AI Technical Summary

Problems solved by technology

[0002] The degree of coalification of lignite is between peat and bituminous coal, with high water content, easy weathering, and easy spontaneous combustion. Because of these characteristics, lignite raw coal is not conducive to long-distance transportation and storage, and the thermal efficiency of direct combustion of lignite is low. Greenhouse gas emissions The amount of lignite is also very large, and it is difficult to develop and utilize it on a large scale. Therefore, lignite must be effectively upgraded in order to be more conducive to utilization, transportation and storage

Images