Analysis of "zero discharge" behind the upgrading of coal chemical wastewater discharge standard

wallpapers Industry 2020-12-09

at present, the domestic coal chemical industry station to the crossroads of development. On the one hand, since last year, the environmental impact assessment of many coal chemical projects has been rejected by the Ministry of environmental protection; on the other hand, the economy of coal chemical industry has been greatly affected due to the fall of international oil price. After experiencing the rapid development in 2014, the coal chemical industry fell into an awkward situation of sudden stop in 2015. Starting from whether the environmental impact assessment of the 4 billion cubic meters coal to gas project in Tacheng of Jiangsu new energy was rejected, none of the environmental impact assessment of coal chemical projects passed this year. So, what kind of gold rush market is behind the dispute of "zero discharge" of coal chemical wastewater.

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are more urgent than refining and power generation. Compared with the traditional and conservative coal industry, the intuitive feeling of coal chemical industry will be more radical. For water treatment, this diversity actually makes zero emissions more difficult. The water quality of wastewater from different coal gasification processes is quite different, which requires targeted design and measures for zero emission projects.

at present, there are still many problems in the near zero discharge of sewage in coal chemical projects:

. First of all, the sewage treatment design and the main process design are not usually completed by the same unit, and the design work is divorced from each other, and there is no seamless connection.

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are the second. The existing wastewater treatment processes have common problems in pertinence and effectiveness. Coal to gas (Lurgi furnace or UK liquid slag Lurgi Gasifier), coal to oil (direct liquefaction) and coal to coke projects generally produce toxic wastewater containing high concentration of phenol ammonia. The traditional simple pretreatment biochemical treatment process is often difficult to operate stably and effectively.

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once again, the current wastewater treatment process often has the problems of fragmentation and low integration. The existing coal chemical projects are implemented by several units, and there are some problems such as poor matching degree, difficulty in effective connection and low integration between the technologies of each unit. Some enterprises do not pay attention to the end treatment and ignore the process water saving. In order to achieve water saving and emission reduction,

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should also strengthen the whole process optimization of sewage treatment, and actively introduce the "water pinch" technology by applying the principle of system engineering, and vigorously promote the cascade utilization and separate quality reuse of water. The chaos in the zero emission market exists now and will continue for some time to come. However, we hope to form a healthy and orderly business atmosphere in the end. Only in such an environment can the technical disputes of zero emission be truly solved.