China Drying Network News At present, China's coal chemical projects have shown rapid development and blooming everywhere. According to incomplete statistics, the national coal-to-alcohol production capacity under construction and proposed capacity is 28 million tons, coal oil is 40 million tons, coal-based natural gas is nearly 150 billion cubic meters, and coal-based ethylene glycol is more than 5 million tons. According to statistics from the China Petroleum and Chemical Industry Federation, during the 12th Five-Year Plan period, China's coal chemical industry base construction investment has reached nearly 2 trillion yuan. After all these projects are completed, China will be the world's largest producer of new coal chemical countries. According to Secretary Xudong introduction. The tons of large-scale coal chemical projects consume more than 10 tons of water, and the annual water consumption is usually as high as tens of millions of cubic meters. China's coal resources are mainly concentrated in the north and northwest. It is precisely these areas that are seriously deficient in water resources. The rapid development of coal chemical industry has caused imbalances in the supply and demand of regional water resources. At present, disputes over water rights have emerged in these areas. To this end, Si Xudong suggested that governments and enterprises should pay attention to protecting the ecological environment and avoid water and groundwater pollution in investing in coal chemical projects. At the same time, the coal chemical project itself needs to achieve zero discharge of sewage and maximize the reuse of sewage to alleviate the severe shortage of water resources. The drainage of coal chemical production in production includes production sewage, domestic sewage, clean water, and initial rainwater. Si Xudong said that the waste water discharged from coal chemical industry mainly comes from coal coking, gas purification and chemical product recovery and refining processes. These waste waters have large amounts of water, complex water quality, large amounts of organic pollutants, phenols, sulfur, and ammonia, and contain a large amount of toxic pollutants such as biphenyl, pyridinium, and quinoline. For the new coal chemical industry, gasification wastewater is the most critical part of its drainage, with complex composition, large amount of water, and difficult handling. According to Secretary Xu Dongdong, in the process of coal gasification, some of the nitrogen, sulfur, chlorine, and metals contained in coal are partially converted to ammonia, cyanide, and metal compounds during gasification; ammonia is also generated. Most of these harmful substances are dissolved in the washing water of the gasification process, the scrubbing water, the separated water after the steam diversion, and the tank drain, and some of them are vented during the cleaning process of the equipment pipeline. At present, the main coal gasification process technologies are fixed bed, fluidized bed, and entrained bed. Their drainage water quality is different. The wastewater generated from the three gasification processes has high ammonia content; the phenol and tar produced by the fixed bed process are high in content; the formic acid compounds produced in the airflow furnace process are higher; cyanide is produced in all three processes; organic pollution COD, the fixed bed process produces the most, the most serious pollution, and the other two processes are less polluting. Therefore, different wastewater treatment processes need to be adopted for different processes. Si Xudong believes that fixed-bed process wastewater must first be recycled and pre-treated by a phenol- and ammonia-recovery plant, and then selected to remove CODcr, BOD5, and ammonia nitrogen as the main biochemical treatment process (mainly considering nitrification and denitrification), and then to eliminate The pretreatment process with oil and decolorization as the main purpose, and the post-processing enhancement process based on materialization. For the fluidized bed and entrained bed wastewater treatment, Si Xudong believes that the main characteristics of this type of wastewater are high ammonia nitrogen, low COD, and good biochemical properties. Therefore, after the ammonia recycling pretreatment, the nitrification and denitrification treatment process should be used. In the process of coal chemical production, a large amount of circulating water is needed. In order to save water resources, it is necessary to consider the reuse of medium water. However, the salt in the sewage after biochemical treatment cannot be removed, and the total salt content in other drainages is also high. These waters are not suitable for reuse. It is also necessary to use the demineralization process before the water can be reused. According to Secretary Xu Dongdong, the currently used desalting processes in China include chemical desalting (ie, ion exchange salt removal), membrane separation technology, distillation desalination, and membrane and ion exchange combined desalination processes. . Drone Power Sprayer,20L Sprayer Drone,Spray Machine Drone,Spray Drone For Agriculture Dongying Tianqi Technology Co., Ltd. , https://www.uav5.com