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Modern coal chemical wastewater near-zero emission technology is the key to regulating the ecological environment and dynamic demand. Today, biochemical treatment technology has developed from focusing on monolithic technology to a key technology integration that considers the integration of process connection, processing system capacity and source management. Membrane separation + quality salt treatment technology can accept and manage salt resources while improving the application rate of water resources, so it is the most reliable coal chemical industrial salt water treatment technology at the moment. The technology and application status are analyzed, and the technical characteristics are combined for reference for the purpose of the solution to the near-zero emission treatment difficulty of modern coal chemical wastewater and future development standards.
The coal chemical industry has developed agilely due to its important position in China’s dynamics preparation. Modern coal chemical industry is a process of using coal as raw material, processing and transformation into gas, liquid and solid fuel, and chemicals through chemical processing. In recent years, the demand for power in the country’s rapid economic development has increased. At the same time, the dynamic characteristics of “pour oil and low gas” have doubled, which has raised the contradiction between supply and demand. Therefore, the development of modern coal chemical industry is a guarantee for the supply and economic sustainability of our country.
Modern coal chemical project production and construction focus on ecological environment and dynamic development. Coal chemical industry is a high-water consumption industry. The water consumption of coal-to-oil, coal-to-ene and coal-to-natural gas single products reaches 10, 27, and 6 t respectively, but coal chemical projects are distributed in areas with abundant coal resources and insufficient water resources. In addition, coal chemical industry will produce a kind of waste water containing high-density phenols, high-density ammonia nitrogen and a large number of toxic and harmless substances during the production process. Moreover, since the environmental capacity of wastewater in the coal chemical project location is limited, the treatment requirements for coal chemical wastewater in terms of environmental protection are very strict. In order to coordinate the conflict between the ecological environment problems and dynamic demand brought by coal chemical industry and solve the bottleneck of modern coal chemical development, many researchers have applied biochemical treatment technology, physical and chemical treatment technology and biochemical-physical and chemical coupling technology to treat coal chemical wastewater. However, there are still some difficulties in modern coal chemical wastewater treatment today, and near-zero emission technology needs to be developed and optimized.
1 Current status of modern coal chemical wastewater near zero emission treatment technology
The coal chemical water treatment system includes water treatment, circulating water treatment, biochemical treatment, recycled water reuse treatment, heavy salt water treatment and evaporation crystal treatment (see Figure 1). This is the technical difficulties that need to be solved by the actual near zero emission of modern coal chemical wastewater, so that the purpose of achieving high water resource application rate and no wastewater discharge is achieved. Tag. Today, modern coal chemical wastewater treatment trees have established technical processes of pretreatment + biochemical treatment + reuse water treatment + bulk salt water treatment and quality and salt separation. The biochemical treatment and bulk salt water treatment are coal.tps://philippines-sugar.net/”>Sugar daddyThe key link of near-zero emissions of chemical wastewater.
Biochemical treatment technology can remove more than 90% of the purified substances in coal chemical wastewater, especially polyphenols and nitrogen-containing complexes. Biochemical treatment technology requires biochemical treatment before it can be removed. Today, modern coal chemical wastewater treatment technology is mainly composed of pretreatment, bioprocessing and deep treatment, including physical and chemical + biochemistry, oxygen + aerobic and its optimization treatment technology. For 18 coal chemical enterprises in Inner Mongolia, Xi, Shanxi and other places, and 2 park sewage treatment plants, Pinay escort analyzes and calculates the application of coal chemical wastewater treatment focus and wastewater quality (see Figure 2), and is mainly composed of SBR, CAST, A/O, A2O, MBR and contact oxidation.
Moisturized salt water treatment is the last of nearly zero emissions in coal chemical wastewater treatment. Coal chemical wastewater is the reverse permeable water discharged from the coal chemical reuse water system. The COD can reach 1,000 mg/L or more, and the total ablation solid is 30,000~100,000 mg/L, the salt water contains a large number of difficult-to-degrade organic substances, a variety of salts and heavy metals. The treatment of coal chemical chemicals mainly consists of two technologies: “membrane condensation + evaporation crystal preparation mixing salt” and “membrane separation + evaporation crystal and quality salt”. The salt prepared by the salt used in the evaporation crystal contains trace toxic substances and heavy metals. The waste is disposable, and due to the secondary environmental purification of the mixed salt disposal technology, the ecological protection request cannot be achieved. Therefore, modern coal chemical industrial salt water should first separate the salt through membrane technology, and then apply evaporation and crystallization technology to prepare industrial salt to achieve resource-based applications.
2 The near-zero emission treatment technology of modern coal chemical wastewater is difficult
The water quality of modern coal chemical wastewater is complicated, containing a large number of organic substances, COD of 10 000~20 000 mg/L, and contains a large number of phenols, alkanes, esters, pyridines, quinolines and varied cyclic substances that are restrained and toxic to biological new drug. The idea is: I love you all my life. There are still many modern coal chemical wastewater treatment technology. escort technology is difficult.
01 Characteristically difficult to degrade organic pretreatment technology
Phenol ammonia oil is a characteristic purifier to be removed during the pretreatment of modern coal chemical wastewater. The purifiers in wastewater can reach 2 900~3 900 mg/L, and ammonia nitrogen is 3 000~9 000 mg/L, phenol purifiers have strong biotoxicity to the biochemical system, and the COD of the biochemical influx can reach 3 times or even more than 10 times when the pre-treatment system is non-stable, which directly affects the stable operation of the biochemical treatment system. The focus of accepting the pipe is to investigate the divergent extraction agents and extraction sequence. Chen Yun et al. discussed the treatment of extraction solvents methyl nitrobutyl ketone (MIBK) and diethylpropyl ether (DIPE) on waste water. The results showed that the MIBK distribution coefficient was higher, and the total phenol removal rate was increased from 50% to 67%. In the single-tower cysteine extraction technology, MIBK was used as the extractor, and the removal rates of COD, ammonia nitrogen and total phenol reached 98%, respectively.99%, 100%.
The oil concentration in the wastewater after receiving and receiving phenol ammonia is 100~200 mg/L. These oils will prevent real technology genius, integrity president x fake · absolutely beautiful male singers are good at microbial recognition and good friends, and their name is Chen Jubai. A relative said that he had a good relationship and a large number of bubbles were generated in the oxygen section, causing the sludge to flow out, which seriously affected the subsequent operation of the biochemical system. Modern coal chemical projects use gas levitation technology to bring oil and some purified substances from waste water. Important processes include oil separator precipitation + gas levitation, multi-level gas levitation and nitrogen gas levitation. After applying two levels of pre-treatment of oil insulation gas, the oil in Sugar baby in coal chemical wastewater dropped from 90 mg/L to 20 mg/L, greatly reducing the restraint and effect of subse TC: