A combined process and system for efficiently treating coal chemical wastewater

Abstract

The invention provides an ecological pool and an efficient coal chemical engineering waste water treatment system and process based on the ecological pool. The system comprises an adjusting pool, an anaerobic treatment device, a whole-process autotrophic nitrogen removal reactor, the ecological pool and a rotary evaporation device which are sequentially connected and arranged. The adjusting pool is used for adjusting the pH value of coal chemical engineering waste water and adding a flocculant for treatment; the waste water treated by the anaerobic treatment device enters the whole-process autotrophic nitrogen removal reactor for nitrogen removal; the ecological pool is provided with a nanofiltration membrane device, an ecological floating bed is arranged on the water level of the ecological pool, and an aeration device is arranged on the bottom layer of the ecological pool. Filtrate obtained after filtering of the nanofiltration membrane device enters the rotary evaporation device. Clean effluent quality is obtained through the adjusting pool, the anaerobic treatment device, the whole-process autotrophic nitrogen removal reactor, the ecological floating bed and the aeration device in the ecological pool, blocking of a nanofiltration membrane can be effectively reduced, and the service life of the nanofiltration membrane can be prolonged. The whole process has the advantages of being low in energy consumption and free of secondary environmental pollution.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a combined process and system for efficiently treating coal chemical wastewater. Background technique [0002] The wastewater discharged by coal chemical enterprises is mainly high-concentration coal gas washing wastewater, which contains a large amount of toxic and harmful substances such as organic matter, salts, ammonia nitrogen and heavy metals. The discharge of coal chemical wastewater will lead to serious water pollution. In order to protect the ecological environment, my country requires that all production wastewater generated in the coal chemical industry during the production process should be used for reuse and not discharged to the outside world, that is, to achieve "zero discharge". However, due to the large amount of coal chemical wastewater and the complex composition of pollutants, it has brought great difficulties to wastewater treatment. [0003]...

AI Technical Summary

Problems solved by technology

The above-mentioned process uses pretreatment and anoxic-aerobic biological process to treat coal chemical wastewater. Although it can remove most of COD and ammonia nitrogen in the water, it cannot remove heavy metals in the water at the same time, and the traditional process requires an external carbon source, which consumes energy. , increase the floor area, and cause secondary pollution, and although the effluent quality can meet the secondary discharge standard in the sewage discharge standard, it still contains a certain amount of COD and NH 3 -N, which makes the subsequent deep desalination treatment difficult

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