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With the rapid development of the economy, environmental pollution is becoming more and more serious, especially water pollution is one of the most important issues of environmental pollution. The pollution of organic pollutants discharged from industrial wastewater accounts for the largest proportion of water pollution. Organic wastewater has a large impact on groundwater, animals and plants. Governance is difficult. Therefore, reducing organic wastewater discharge and reducing organic wastewater pollution are the focus of organic wastewater treatment.

First, Source of organic wastewater

Industrial wastewater and urban domestic water are one of the main sources of water pollution in China. In recent years, with the rapid development of industry and the economic take-off. The pollution sources of high-concentration organic wastewater are becoming more and more serious. The pollutants in organic wastewater mainly come from petroleum coking, metallurgy, chemical industry and other industries. Due to the high concentration of organic pollutants in the industry, it poses a great environmental hazard. According to the nature and source of organic wastewater, it can be divided into three categories: one is high-concentration organic wastewater that does not contain harmful substances and is easily degraded, such as food industry wastewater; the second is high-concentration organic wastewater containing harmful substances and easily degraded. For example, some chemical wastewater; the second type is high-concentration organic wastewater containing harmful substances and not easily degraded, such as agricultural wastewater. A large amount of organic pollutants are also present in these high-concentration organic wastewaters. If the company directly discharges these pollutants, it will cause great harm to the environment.

Second, the treatment method of organic wastewater

There are two main methods for treating organic wastewater, one is physicochemical treatment and the other is biological treatment. Physical treatment is the application of physical principles to convert pollutants in organic wastewater into harmless substances. Such as adsorption method, photochemical solidification method, air floatation method, membrane separation method, electrochemical method and the like. In practical applications, since a single physical processing method is difficult to handle, a single processing method is rarely used. Biological treatment uses biotechnology to purify organic wastewater. The advantages of bioprocessing technology, large economic feasibility, easy adjustment, etc. have become the main processing methods of modern organic wastewater treatment technology.

1. Adsorption treatment method

The adsorption method includes an activated carbon adsorption method and a resin adsorption method. Activated carbon adsorption is the use of abundant micropores in activated carbon to remove impurities in water. The premise is that the diameter of these impurities must be smaller than the diameter of the micropores. Activated carbon adsorption method is not very ideal in practical applications. Therefore, the application of this method in pollutant treatment needs to be studied. The resin adsorption method can not only purify organic wastewater, but also recover resources, which is the most promising adsorption method. The adsorption resin realizes the separation, collection and recovery of pollutants in organic wastewater through its inherent and special structure. The reuse of sewage resources has been realized.

2. Oxidation treatment of organic wastewater

The oxidation method is to treat organic wastewater with strong oxidizing property under certain conditions, and react with pollutants to achieve the purpose of removing pollutants. Advanced oxidation technology is currently a hot spot in organic wastewater oxidation technology. It is an effective method for treating organic wastewater. Advanced oxidation produces free radicals in different ways. After the hydroxyl radical is formed, a radical chain is initiated. Decomposes pollutants in water, causing decomposition into water, carbon dioxide and mineral salts. There are many applications in advanced oxidation technologies, such as refractory pollutants in organic wastewater. However, it is necessary to accelerate the development of new reactors. In order to improve the degradation rate of organic wastewater and improve the efficiency of wastewater treatment. Advanced oxidation has the following characteristics compared to other wastewater treatment methods. The first can generate a large number of hydroxyl radicals, significantly improving the removal efficiency of nitrobenzene in water. The removal efficiency of p-nitrobenzene is much higher than the removal efficiency of single feed. The second advanced oxidation method is a physicochemical process that is easily controlled during the process to meet the needs of different situations. The third advanced oxidation method can be used alone or in combination with other treatment methods to reduce the cost of organic wastewater treatment. How can we get rid of this written ending?

Third, biological treatment technology to treat organic wastewater

Biological treatment technology is the decomposition and adsorption of organic matter in organic wastewater by the metabolism of microorganisms. Turn it into a harmless substance. It plays a role in the purification of water. In the process of organic wastewater treatment, biological treatment technology has low economic investment and avoids secondary pollution, so it is worthy of promotion in many fields, including aerobic biological treatment technology and anaerobic biological treatment technology.

1. Aerobic biological treatment technology

Aerobic biotechnology under aerobic conditions, through anabolism, catabolism, organic matter in wastewater is decomposed into inorganic matter, and the microorganism itself is also reproducing. This kind of sewage can get the essence. The aerobic biological treatment technology has a short reaction time and a fast processing speed. Less odor is emitted during processing. More practical medium and low concentration organic wastewater.

2. Anaerobic biological treatment technology

The anaerobic biological treatment technology is a process of converting organic matter in organic wastewater into inorganic matter and a small amount of cellular matter by utilizing the metabolic activities of various anaerobic facultative anaerobic microorganisms under anaerobic conditions. This method not only eliminates environmental pollution, but also develops bioenergy. Generally divided into four stages of hydrolysis, fermentation, acetic acid production and methane production. Compared with aerobic biotechnology, there is less residual sludge and energy can be recovered. The main disadvantages are slow reaction times and long reaction times. Can be used in high concentration organic wastewater.

3. Combined process

In the actual organic wastewater treatment process, especially high-concentration organic wastewater is often treated with anaerobic-aerobic biological treatment. In this combination process, the high-concentration organic wastewater is first subjected to anaerobic biological treatment, and then subjected to aerobic biological treatment for further purification. It effectively compensates for the defects of aerobic treatment and anaerobic treatment, and has achieved good results in practical applications.

Fourth, Conclusion

With the rapid development of industry and economy, the content of pollutants in high-concentration organic wastewater and organic wastewater is increasing. A single biological treatment technology can no longer meet the actual needs. In practical applications, a combination of multiple processing technologies is widely used, and various technologies are continuously enriched and improved. Our environmental workers are also constantly overcoming the technical problems of dealing with organic pollutants and making due contributions to the cause of environmental protection.