Treatment process for sewage water generated from medium-low temperature carbonization of coal

Abstract

The invention relates to the field of coal chemical industry and environmental engineering, in particular to a process for treating sewage generated by coal moderate-low temperature carbonization, which comprises processing steps of oil removal, micro electrolysis, ammonia blowing, strain biological treatment, mud-water separation and coagulation treatment. The process is performed according to the sequence, performs intensified pretreatment on the sewage by the physical and chemical actions of the oil removal, the micro electrolysis and the ammonia blowing so as to remove pollutants such as oil, COD, ammonia nitrogen, higher phenols, and the like in the high concentration sewage generated by the coal moderate-low temperature carbonization with the removal rate up to more than 60 percent so that the pretreated sewage reaches the biochemical treatment requirement, and then performs the mud-water separation and the coagulation treatment on the sewage so that the water quality after the treatment reaches the discharge requirement.

Description

technical field [0001] The invention relates to the fields of coal chemical industry and environmental engineering, in particular to a process for treating sewage produced by low-temperature dry distillation in coal. Background technique [0002] my country is rich in coal resources, but coking coal resources are in short supply. my country's Shenfu in Inner Mongolia, Shaanxi, Dongsheng Coalfield, Datong, Shanxi, Xinjiang and other places are rich in high-quality non-sticky (weak) coal resources. The vertical carbonization furnace is a new technology specially developed for the carbonization of weakly cohesive lump coal. The main product of this process - semi-coke (special coke for ferroalloy) has a high yield, and at the same time it can recover extremely valuable by-products - gas and medium and low temperature tar. It is an excellent technology for saving high-quality coking coal and rationally utilizing coal resources. It has been approved by the state. Recognition an...

AI Technical Summary

Problems solved by technology

Most of the vertical furnaces used by these enterprises are small-scale internal heating vertical furnaces built in a simple manner. Except for part of the gas returned to the furnace for use, most of the gas is emptied, and the sewage has not been treated. The resources have not been rationally utilized, and the environment has also been seriously polluted. Relevant policies, these enterprises will be closed within a time limit, and the medium and low temperature dry distillation of coal will be replaced by large vertical furnaces with gas recovery

[0004] However, in the vertical furnace, the coal gas generated by the medium-low temperature dry distillation of the block fuel and the removal of volatile matter has not undergone high-temperature secondary cracking, and the sewage generated after the raw coal gas is condensed and cooled has complex components, and the content of organic matter and ammonia nitrogen is very high, which is different from conventional There are obvious differences in the sewage produced by coking, and there is no good treatment method so far

The incineration method consumes a lot of gas, high energy consumption, and the water cannot be reused

The application of traditional biochemical treatment not only requires adding a large amount of dilution water, but also the quality of the effluent water is unstable, and the pollution problem cannot be solved fundamentally. It not only wastes fresh water, but also increases the discharge of treated sewage