Coal chemical industry waste water treatment technology

Abstract

The invention provides a coal chemical industry waste water treatment technology. The coal chemical industry waste water treatment technology comprises the following steps of firstly performing an ammonia-phenols removal treatment technology on organic waste water in coal chemical industry waste water so as to obtain treated waste liquid; then performing a biochemical treatment technology on the treated waste liquid obtained in the above step so as to obtain biochemical treatment water; then performing a concentrating treatment technology on the biochemical treatment water obtained in the above step and salt-containing waste water so as to obtain reuse water and high-salt waste water; and finally performing a strong brine treatment technology on the high-salt waste water obtained in the above step so as to obtain salt-containing materials, wherein the ammonia-phenols removal treatment technology comprises a deacidification and ammonia removal working procedure, an extraction working procedure, a solvent removal working procedure, a solvent reclaiming working procedure, a waste liquid separation system, a solvent storage working procedure and an alkali liquid preparation working procedure. According to the coal chemical industry waste water treatment scheme provided by the invention, through gradient utilization and repeated utilization of the waste water, the use of fresh water resources is furthest reduced, so that the water consumption of projects can be fully reduced, and zero drainage of polluted water is realized.

Description

technical field [0001] The invention relates to the field of industrial sewage treatment, in particular to a treatment process for coal chemical wastewater. Background technique [0002] With the rapid development of the energy industry in recent years, coal chemical industry wastewater has become one of the important sources of pollution. The coal chemical industry is both a large water user and a large sewage discharge user. The waste water produced per unit of product is more than 1t / t, and the methanol plant with an annual output of 200,000 tons discharges hundreds of tons of waste water per hour; moreover, the waste water contains refractory tar, phenol and other substances , the composition is complex. It is difficult to treat by general biochemical process, and it is very difficult to control the pollution of wastewater in the coal chemical industry. However, with the sustainable development of the economy and society and the improvement of people's requirements for...

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Problems solved by technology

[0005] However, the complexity, high pollution, and refractory nature of coal chemical wastewater make it difficult to effectively degrade it by conventional treatment methods. There are few examples of domestic coal chemical wastewater treatment projects that have been put into operation that can meet the discharge standards stably. Most of them are in unstable operation or failure state, and the problem of coal chemical wastewater treatment has become a bottleneck restricting the development of coal chemical industry

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