Sewage Treatment Chemicals
Wastewater treatment (sewage treatment, wastewater treatment): In order to achieve the sewage drain or a water quality requirements again its purification process. Sewage treatment is widely used in construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscape, health care, food and other fields, but also more and more into the daily lives of ordinary people.
Wastewater treatment (sewage treatment, wastewater treatment): In order to achieve the sewage drain or a water quality requirements again its purification process. Sewage treatment is widely used in construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscape, health care, food and other fields, but also more and more into the daily lives of ordinary people.
Sewage treatment
Sewage treatment can be divided into three types according to their role in the physical, biological and chemical methods.Sewage treatment in accordance with the extent to which can be divided into primary treatment, secondary treatment and tertiary treatment.
Common treatment agents
Low molecular inorganic flocculants :The most widely used are iron, aluminum-based metal. The mainstream market are aluminum chloride, ferric chloride, ferrous sulfate and aluminum sulfate,poly aluminium chloride;
PAC (cpolyaluminium chLoricle) is a new type of mainstream inorganic polymer flocculant in water treatment because of its more traditional inorganic agents have a higher efficacy, so will rapid development and wide application.
Ferric chloride water formula (FeCl3 • 6H20),alum precipitate formed is good, handling or low temperature water turbidity water better results than aluminum, suitable for a wide range of pH values, but the water color post-processing than aluminum Department of high corrosive.
Ferrous sulfate formula is (FeS04 • H20) Features: dissociation of Fe2 + can generate the most simple mononuclear complex, as the divalent iron salt has a good coagulation effect. Aluminum sulfate formula is Al2(S04)3 features: It is the most used wastewater treatment flocculants, ease of use, good flocculation, when the water temperature is low difficulty hydrolysis, floc formation looser, its effective pH range is narrow. Mechanism of alum (Al2 (S04)3 • K2S04.24H20) is quite similar with aluminum sulfate.
st-processing than aluminum Department of high corrosive.
Development of the industry
Water concept in many developed countries is to minimize the use of clean water, reducing the discharge of sewage, recycling of water resources. Recycled water is also relatively long history, as early as in the 19th century, London, Boston, Paris and other cities have on the legitimate use of recycled water bill introduced. With the continuous improvement of wastewater reclamation and use of technology, recycled water in industrial, agricultural, municipal life have been more widely used.
nbsp;of the past two years.
In addition, the recycled water as an important water resource in the world, many other developing countries have also been more and more widely used. Such as Mexico, Argentina, Brazil and other countries have begun to use recycled water, which is used for agricultural irrigation proportion of the maximum. Recycled water and desalination, inter-basin water transfer compared to its low cost, but also help improve the ecological environment and to achieve a virtuous cycle of water ecology. Whether it is one of the best ways from the technical, economic terms are still ways to alleviate the water crisis.
the past two years.
Future trends
Over the past few years in china, the industrial capacity of the sewage treatment industry has undergone a qualitative change, this qualitative change is mainly composed of two aspects, one is the number of sewage treatment plants is increasing rapidly, the second is the overall handling capacity rapidly in. China's urban sewage treatment capacity in the "Eleventh Five-Year" period was a great improvement, and continued to maintain the growth rate of the past two years.