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For the sake of cost, a large amount of wastewater produced by industrial enterprises is recycled and discharged after being purified by different specialized equipments and technological processes, and the treatment links are mostly inside the industrial enterprises. Domestic sewage is mainly discharged from office and household environments due to its dispersed sources. Most of them are concentrated in sewage treatment plants, while for polluted rivers, lakes and other seriously polluted water bodies where sewage accumulates, comprehensive treatment of water environment will be carried out, which will meet the requirements of environmental protection landscape and improve the quality of urban living environment.
The diversity of sewage sources and treatment purposes makes the demand for sewage treatment diversified.
According to the report on the strategic planning of market research and investment of water equipment and agent industry in China's sewage treatment pharmaceutical and electronic industry from 2014 to 2019 published by China Industrial Information Network, the shortage and pollution of water resources in China are becoming increasingly prominent with the acceleration of industrialization and urbanization. According to the 12th Five-Year Plan of National Environmental Protection 》 During the 12th Five-Year Plan period, the demand for environmental protection investment is about 3.4 trillion yuan. The Ministry of Environmental Protection predicts that the cumulative investment in sewage treatment will reach 1.06 trillion yuan during the 12th Five-Year Plan period. The proportion of sewage treatment investment in environmental protection investment is about 1/3. Sewage treatment has become an industry with huge market space in China's large environmental protection industry.
Wastewater treatment industry is facing diversified treatment needs
The demand of sewage treatment is different in different fields. The selection of seawater desalination equipment treatment technology needs to take into account many factors such as sewage generation, standard requirements, operation cost, treatment speed, operation environment, energy consumption and so on. In the industrial field, the unit time of metallurgical turbid water, mine water, oil field produced water and chemical cooling water needs to be treated with large amount of water, relatively low water quality requirements and treatment costs need to be controlled within a certain range, so it needs water treatment technology with large capacity, short purification time and cost savings. Industrial water, such as raw water (which is directly a part of the product), requires a higher degree of cleanliness of water, otherwise it will affect the quality of products, so refined water treatment technology is needed.
For domestic sewage, centralized treatment is usually carried out through sewage treatment plants. With the increasing scarcity of water resources in China, more and more domestic sewage is reused after treatment. For the reuse of water, deep treatment is generally required; for the treatment of rivers, lakes and landscape water environment, its main technology of water treatment is water treatment. In order to deal with large amount of water, fast purification speed and low operation cost, it is necessary to purify the main pollutants which lead to eutrophication, such as suspended solids, total phosphorus, chemical oxygen demand, with high efficiency, and have the ability of continuous clean guarantee.
It is precisely because of the diversification of water treatment needs that the water treatment industry presents the coexistence of a variety of treatment technologies and processes. No technology or equipment can meet all the needs of sewage treatment. Different sewage treatment technologies have their advantages in application areas. Large-scale integrated sewage treatment projects generally adopt a combination of various technologies to treat sewage.
Technical Overview of Wastewater Treatment Industry in China
At present, sewage treatment technologies widely used in China include traditional sedimentation technology, coagulation sedimentation technology, membrane technology, magnetic separation water purification technology, activated sludge technology, constructed wetland technology and biological floating island technology, which are applicable to different fields or stages of sewage treatment.
Traditional sedimentation technology is based on physical method. Pollutants have relatively low input due to their own gravity natural precipitation, but the reaction time is longer and the purification effect is relatively limited. It is mostly suitable for the pretreatment of sewage treatment.
Coagulation sedimentation technology is based on traditional sedimentation technology. By adding coagulants, the types of pollutants treated are enlarged and the sedimentation speed of pollutants is accelerated. However, the sedimentation process is still based on the principle of gravity. The purification effect of water with higher pollutant concentration is relatively poor, and the sludge concentration after sedimentation and purification is lower. The follow-up process is complicated.
Constructed wetland and biological floating island technology are based on natural biological treatment method. Organic pollutants in sewage are purified by metabolic reaction of organisms. The natural growth of organisms makes the sewage environment have self-purification ability. However, the purification speed of this technology is relatively slow, and the continuous cleanliness ability needs to be improved.
Membrane technology mainly includes membrane separation technology based on physical method and membrane bioreactor (MBR) technology combined with physical method and biochemical method. This technology can realize deep purification of sewage, and the quality of effluent is high. At present, it is widely used in municipal water supply, reclaimed water reuse, seawater desalination and other fields. Because membrane components and filaments are easily blocked or cut by contaminants, other pretreatment technologies are usually integrated in their front end. At present, the overall operation cost of membrane technology and its supporting technology is relatively high, and it has less application in the fields of large amount of treated water, industrial recycling sewage treatment which does not require too high water quality, River and lake landscape water environment treatment and so on.
Magnetically separated water purification technology is essentially an efficient adsorption and purification technology based on physicochemical method. It makes different pollutants form magnetic flocs through necessary physical and chemical reactions, and then uses magnetic force to quickly separate pollutant flocs from water. It is an active salvage water purification technology for pollutants in water. 。 Magnetically separated water purification technology has the advantages of large amount of water treatment, short purification time and saving area, and has its own unique technical advantages in the purification efficiency of suspended solids (SS), chemical oxygen demand (COD), total phosphorus (TP) and other water pollutants. Magnetically separated water purification technology not only improves the shortage of traditional technology, but also fills the technical gap of fine and high-cost water purification technology which is not applicable in some areas. As a result, it has gradually been widely used in the fields of metallurgical turbid water treatment, coal mine water treatment, River and lake landscape water environment treatment, emergency treatment of water pollution, etc. Generalized application.
Brief Introduction of Main Sewage Treatment Technologies in China
Main Technology Traditional Sedimentation Technology Activated Sludge Technology Constructed Wetland Technology Membrane Technology Magnetic Separation Water Purification Technology
It can be used in pretreatment stage of various water treatment and other links of gravity separation. Municipal wastewater treatment/other biodegradable organic wastewater treatment, etc. Purification of organic pollutants in water environment of rivers and lakes. Advanced treatment of industrial effluent/desalination/municipal water supply/municipal sewage treatment, etc. Industrial fields such as metallurgical turbid water treatment, mine water treatment, River and lake landscape water environment treatment, municipal sewage treatment, emergency water pollution treatment, etc.
The technology features are that natural gravity is used to separate pollutants, construction and operation costs are relatively low, and purification reaction time is relatively long. The transformation and removal of organic pollutants in wastewater can be realized by microbial metabolism; the water content of excess sludge is high, the subsequent treatment workload is large; and the quality of effluent is not stable enough. It mainly uses the natural growth mechanism of biological vegetation and microbial metabolism to absorb and clean organic pollutants in water environment; biological vegetation needs growth and cultivation, and has a relatively long clean time; it covers a large area. The principle of filtration, infiltration and microbial metabolism is used to separate and purify micro-pollutants and organic pollutants in sewage. The cost of operation and maintenance is relatively high, and it is mostly used in advanced treatment of sewage treatment. The quality of effluent is good. Active separation and purification of pollutants are realized by magnetic adsorption. The purification time is short and the concentration of pollutants after separation is high, which is convenient for follow-up treatment. It is suitable for large-volume sewage treatment and effluent quality is good.
Traditional precipitation is an important process of water treatment because of its simplicity and practicability. However, due to its large area and low efficiency, it has been developed into coagulation precipitation, loading precipitation and other technologies. It is one of the most effective biological treatment methods for municipal domestic sewage. With the strictness of discharge water quality standards, activated sludge process will be developed to treat different industrial wastewater according to different treatment objectives. Constructed wetland is a comprehensive ecological process, and the application of constructed wetland to special industrial wastewater treatment is a new feature and trend of future development. The manufacturing technology of membrane and membrane components is diversified; the cost-performance ratio of membrane components is gradually improved; the technology level of membrane application is gradually improved, and the serialized membrane application process will gradually be formed. It can widen the types of pollutants and wastewater to be treated, combine with other technologies more strongly, and realize complementary advantages, materials and technology.
Market space is the basis of sewage treatment technology. Traditional sedimentation technology is simple and feasible. In the future, as the front stage pretreatment technology of sewage treatment in many fields or applied to general sewage treatment process without specific water quality requirements, there is still a large market space. At present, sewage treatment technology is widely used in municipal sewage treatment plants in China. In the future, there is still a good application foundation and market space in the field of sewage treatment in small and medium-sized cities and towns in China. In the field of lake and landscape water environment treatment, the market application is expanding, and some industrial sewage treatment fields are also beginning to be applied. There is a broad market space for sewage treatment containing organic pollutants in the future. There is a broad market space in the upgrading and renovation of municipal wastewater treatment plants and the new construction of urban reclaimed water plants, and the market space application in the field of river and lake water environment treatment and industrial wastewater treatment is gradually expanding, and the future market prospects are promising. It has broad market space in the fields of water purification and treatment of metallurgical turbid water, mine water treatment in coal industry, River and lake landscape water environment treatment, etc. It has good application foundation and market prospects in municipal sewage treatment and emergency water treatment.
Author: Hangzhou Water Shield Technology Co., Ltd.
Website: http://www.zjhzsd.com/
Key words: water equipment in electronic industry, desalination equipment
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