The technical level of the product of the geographical sewage treatment equipment

From 1993 to 1994, the State Science and Technology Commission, the Ministry of Construction, the Ministry of Machinery, and the State Bureau of Technical Supervision jointly organized and the National Urban Water Supply and Drainage Engineering Technology Research Center was responsible for evaluating the key products of the domestic water industry. The evaluation work lasted nearly two years, and nine expert groups conducted a large number of on-site investigations, user visits, sample testing and other work for more than 200 products from 140 enterprises. The evaluation results show that the overall technical level of domestic urban sewage treatment equipment has basically reached the international level of the seventies, and some products have reached the level of the eighties, such as centrifugal pumps, small-caliber submersible sewage pumps and other products produced by relevant domestic enterprises have introduced advanced technology from Germany; The United States and Japan technology have been introduced into the clamp disc valve, flange disc valve and other products; Roots blower has introduced Japanese technology; The belt sludge press filter dewatering machine has introduced French and Austrian technology; The microporous aeration device absorbs the Finnish technology, and the performance of the product is improved.

The special machinery and equipment for sewage sludge treatment have not yet systematically introduced the international advanced technology for digestion, and most of them are still at the "usable" level, with quality defects such as high failure, high material consumption and unstable performance.

1. Continuous Circulating Aeration System (CCAS).

2. SPR high turbidity sewage treatment technology.

3. Biolak sewage treatment technology.

Fourth, the application of EWP high-efficiency sewage purifier in papermaking sewage treatment.

5. Water purification technology for high-efficiency vertical flow constructed wetland system.

The development trend of China's sewage treatment industry

——Upgrading and upgrading is the future development direction of urban sewage treatment, and the demand for rural sewage treatment is large

For a long time, China's water resources are scarce, water pollution problems are serious, and wastewater discharge remains high, and the water environment needs to be improved urgently. By the end of 2019, China's urban sewage treatment rate has reached and, while the penetration rate of rural sewage treatment is still low, the number of construction towns and townships for sewage treatment is relatively low, and the rural sewage treatment rate is less than 30%.

On the whole, in the future, China's sewage treatment demand will gradually develop to economically underdeveloped areas, upgrading and upgrading is the main growth point of China's urban sewage treatment in the future, and the development space of rural sewage treatment is huge.

In addition, China's sewage treatment has long had the problem of "heavy plant and light network". On the one hand, although the sewage treatment facilities have been built, due to the lack of a collection pipe network, the "sunbathing project" writes low load rates from time to time. On the other hand, the water quality of the river is affected by the disrepair, damage and leakage of the pipe network and the wrong connection.

Compared with the sewage treatment plant, there is a clear charge, and the construction and maintenance of the pipe network basically rely on the government to pay, which brings greater pressure to the local government, so this is also the focus and difficulty of China's sewage treatment model innovation in the future.

In terms of market competition, PPP policies have become stricter, project performance appraisal has been strengthened, prompting market players with different advantages to accelerate asset integration, leading enterprises actively merge topics, consolidate market positions, in addition to traditional water companies, external enterprises have also crossed over through mergers and acquisitions and other ways to enter the sewage treatment industry, transformation into the field of sewage treatment, market competition shows a trend of diversification, and at the same time promote the industry to accelerate to concentration.

The above data ** is in the Prospective Industry Research InstituteAnalysis report on market prospect and investment strategic planning of China's sewage treatment industry

Generally speaking, there are only two major aspects, the first is physical treatment, including grating, precipitation, etc., and the second is biochemical treatment, including the reaction of various microbial strains and chemical additives, etc

The characteristics of domestic sewage are as follows:

1. There are many sources of consumption: in addition to the sewage generated from human feces and kitchens, there are also sewage generated by household cleaning, bathing and daily life

2. Rapid growth: With the improvement of farmers' living standards and the change of life style, the amount of domestic sewage generated has also increased

3. Large fluctuations: rain and sewage are not separated, resulting in large fluctuations in water quality and quantity

4. Low treatment rate: intermittent discharge of sewage, small and scattered discharge;

5. The concentration of nitrogen and phosphorus in sewage is high and contains a large amount of nutrients, bacteria and viruses.

If the domestic sewage is not directly discharged after treatment, it will cause serious pollution to the water environment, so it is necessary to choose the appropriate domestic sewage treatment equipment for Shanqiao infiltration according to local conditions.

<> domestic sewage treatment equipment has the following main characteristics:

High polluting power. Domestic sewage contains a large number of pollutants from life and production, such as human excrement, sewage produced by washing, kitchen waste, etc., which have a high polluting power to the water environment and aquatic ecology.

High organic pollution. The main pollutants in domestic sewage are organic pollutants, such as sugar, starch, urea, heat protien, etc. These organic pollutants need to be degraded by microbial fermentation and decomposition.

High contamination formation capacity. There are a large number of specialized protein-like chelating agents in the sewage of Sunheng, which can form a large number of dirt particles and dirt layers in the water, reduce the transparency of water quality, and destroy the beauty of the water environment.

Contains pathogenic bacteria. Domestic sewage socks often contain a large number of pathogenic bacteria, such as listeria, salmonella, toxoplasmosis, etc., which pose a threat to the surrounding water environment and human health and safety.

It is easily contaminated by pollutants. The pollutants in domestic sewage are mainly organic matter, and unless the pollution can be reduced after proper treatment, it is easy to pollute the surrounding water bodies after being put into the water body, causing secondary pollution. Therefore, domestic sewage treatment plays a key role.

The status quo abroad.

The United States is currently the country with the largest number of sewage treatment plants in the world, with an average of 1 for 5,000 people, of which 78 are secondary biological treatment plants; There are about 8,000 treatment plants in the UK, with an average of 1 for 7,000 people, almost all of which are secondary biological treatment plants; There are about 630 urban wastewater treatment plants in Japan, with an average of 200,000 people, but 98 6 of them are secondary treatment plants and advanced treatment plants; Sweden is currently the country with the most widespread sewage treatment facilities, with a sewerage penetration rate of 99,172 and an average of 5,000 people in one sewage treatment plant, of which 91 are secondary biological treatment plants. The experience of these countries shows that there has been a marked improvement in vigorous construction; Japan's non-conforming waters have dropped from O 6 in 1971 to 0 05 in 1980; The organic pollution of the Rhine River in Europe has been basically controlled, the water quality of some sections of the river has been significantly improved, and fish have been revived. The Thames River in the United Kingdom, which has been extinct for more than 100 years, has re-emerged and now has 119 species.

As of the 70s of the last century, developed countries basically popularized secondary treatment, but secondary treatment consumes more energy, high operating costs, and infrastructure investment is not low. Developing countries generally "can't afford to build" or "can't afford to raise", so they have sought to adapt to their own national conditions The high cost of use has caused a lot of criticism, it is reported that the United States is more than 1 billion US dollars, so they are also vigorously researching new technologies, or reforming traditional processes.

The current situation in the country. China's urban sewage treatment industry began in 1921. Shanghai first established the North District Sewage Treatment Plant, and in 1926, the West District and East District Sewage Treatment Plant were built, with a total treatment capacity of 40,000 tons per day. In recent years, with the development of the economy, the problem of water pollution control is becoming more and more serious, not only large, medium and small cities to build sewage plants, but also some suburban counties also build sewage plants, a few years, Shanghai Qingpu Xujing Town, Chongqing Chongqing City According to 2000 statistics, the national urban sewage treatment rate reached 25, 2010 will reach 50.

However, compared with advanced countries, China's cities and mechanization, automation degree, there are still technical policy requirements, urban population of more than 500,000 cities, must establish sewage treatment facilities; In key river basins and water resources protection areas, small and medium-sized cities, villages and towns with an urban population of less than 500,000 should build sewage treatment facilities in accordance with local water pollution control requirements. There are also clear provisions in the constitution, and many factories have been established, and many products have been serialized, but there is still a big gap between automation instruments and detectors and foreign countries, and insufficient funds are still a fundamental problem.

1. Efficient treatment: The treatment efficiency of AAO process sewage treatment equipment can reach more than 90%, which can effectively remove organic matter and rubber nitrogen pollutants in sewage.

2. Small footprint: A: The process sewage treatment equipment adopts a circulating flow biological treatment system, which occupies a smaller area than the traditional treatment equipment Qingrusong.

3. Low operating cost: The operating cost of AAO process sewage treatment equipment is low, because the biotechnology it uses does not need to consume a lot of electrical energy and chemicals.

1. Physical method: the use of physical action to treat, separate and improve the pollutants in wastewater. For example, the precipitation method (gravity separation method) removes suspended solids with a relative density greater than 1 in water; Filtration method (filter screen, sand layer, activated carbon) can remove suspended solids in water; The evaporation method is used to concentrate non-volatile and soluble substances in wastewater, and there are also centrifugal separation methods, vapor flotation (flotation) methods, high-gradient magnetic separation methods, etc.

2. Chemical method: the use of chemical reaction or physicochemical action to treat ** soluble waste or colloidal substance. For example, the neutralization method is used to neutralize acidic or alkaline wastewater; The extraction method uses the "allocation" of soluble wastes with different solubility in the two-phase interaction, such as phenols and heavy metals; The redox method is used to remove reducing or oxidizing pollutants in wastewater and kill pathogenic bacteria in natural water bodies.

In addition, there are coagulation methods and chemical precipitation methods.

3. Biological method: the use of microbial biochemical action to treat organic pollutants in wastewater. For example, biological filtration and activated sludge are used to treat domestic sewage or organic production wastewater, so that organic matter can be converted and degraded into inorganic salts and purified.

In addition, there is also the biofilm method and the biopond method.