Sewage treatment

sewage treatment (wastewater treatment) : The process of purifying sewage so that it can be discharged into a body of water or reused. Sewage treatment is widely used in construction, agriculture, transportation, energy, petrochemical, environmental protection, urban landscape, medical, catering and other fields, but also more and more into the daily life of ordinary people.

Development:

The topic of water pollution is constantly raised, especially the problem of groundwater pollution, Hangzhou, Wenzhou and other places in Zhejiang province, farmers or entrepreneurs invited the director of environmental protection to swim in the river, in order to attract everyone's attention to the severity of water pollution, although each director of environmental protection has chosen to silence or refuse, but the public's awareness of environmental protection, the level of concern about water pollution has reached an unprecedented level.

Surface water pollution is obvious, but groundwater pollution is alarming. 70% of China's 1.3 billion people drink groundwater, and more than 400 of China's 660 cities use groundwater as a source of drinking water. However, it is reported that 90% of the country's urban groundwater has been polluted.

Another set of data also shows that groundwater is facing serious challenges. In 2011, Beijing, Shanghai and other nine provinces and cities in the area of 857 monitoring Wells assessed water quality is class I, Class II monitoring Wells accounted for 2%, and class IV, class V monitoring Wells up to 76.8%.

Among the nine provinces and cities, the best water quality is Hainan Province, mainly Class II, followed by Shanghai and Beijing, mostly Class III, Heilongjiang and Jiangsu have the highest proportion of Class IV water, while Jilin, Liaoning, Guangdong and Ningxia generally only reach the level of Class V.

The situation of water pollution continues to worsen, making the sewage treatment and recycling industry has received unprecedented attention, the gross profit margin in the past two years has remained at about 70%, and even more than 100% in some areas, and the development potential of the industry is very large.

Categories:

According to the classification of sewage sources, sewage treatment is generally divided into production sewage treatment and domestic sewage treatment. Production sewage includes industrial sewage, agricultural sewage and medical sewage, etc., and domestic sewage is the sewage generated by daily life, refers to various forms of inorganic substances and organic compounds of complex mixture, including: (1) floating and suspended solid particles; ② Colloidal and gel-like diffusers; ③ Pure solution.

According to the quality of water pollution, there are two types of water pollution: one is natural pollution; The other is man-made pollution, which is more harmful to the water body at present. Water pollution can be divided into chemical pollution, physical pollution and biological pollution according to the difference of pollution impurities. The main pollutants are: (1) industrial wastewater discharged without treatment; (2) Domestic sewage discharged without treatment; (3) Farmland sewage with large amounts of chemical fertilizers, pesticides and herbicides; (4) Industrial waste and domestic waste piled up in the river; (5) Water and soil erosion; (6) Mine sewage.

There are many ways to treat sewage, which can be generally summarized as physical method, chemical method and biological method.

Sewage treatment plant: Some people investigate more than 100 large treatment plants, there are more serious problems, such as insufficient funds, high costs, low efficiency, the general efficiency of less than 70%, only 40% of the low.

Sewage treatment cost energy consumption: basically high energy consumption and low efficiency.

In 2013, urban domestic sewage discharge has been the main source of urban water pollution in China, and domestic sewage treatment is the top priority of current and future urban water saving and urban water environmental protection work, which requires us to treat the construction of domestic sewage facilities as an important part of urban infrastructure to grasp, and it is an urgent thing.

With the development of science and technology, the direct utilization of sewage has become possible, and the sewage source heat pump system is used to utilize urban raw sewage.

The so-called raw sewage is the city directly discharged untreated domestic and industrial wastewater, the current utilization method is the raw sewage directly into the sewage source heat pump system for heat exchange, in the case of consumption of a small amount of electricity for indoor cooling and heating of urban buildings. Sewage reuse has several technical difficulties to overcome: blockage, corrosion, heat transfer efficiency.

Sewage source heat pump system is composed of sewage heat exchanger and sewage source heat pump two parts. After the urban raw sewage directly enters the sewage heat exchanger for heat exchange, the heat exchanged is transferred to the room by the heat pump inside the sewage source heat pump.