1. Industrial wastewater treatment method
A method of treating industrial wastewater, belonging to the field of wastewater treatment technology. It is the sewage will be led to the catchment basin, the catchment basin at the end of a compartment to adjust the pH, with a dissolved gas pump to lift to the first pressure dissolved gas tank, while the inhalation of air and polycondensation decolorant, will be in a first-pressure dissolved gas tank of the first saturated dissolved gas water suddenly released to the first level of the air-float pool to form a first level of treated water; first level of treated water overflowed into the buffer tank, and then in the control of the pH with a second level of dissolved gas pump will be first level of treated water lifted to the second level of pressure dissolved gas tank, while inhalation of air and polycoagulation decolorizer. Tank, while inhaling air and polycondensation decolorant, the secondary pressure dissolved gas tank in the secondary saturated dissolved gas water suddenly released to the secondary air flotation tank to form the second level of treated water and since the overflow to the sedimentation tank precipitation discharge; one or two air flotation tank in the floating sludge into the floating mud pool, filtering filter cake, filtrate back to the catchment pond. This method of industrial wastewater treatment of CODcr, decolorization rate, SS, BOD [5] removal rate of 80-90%, 95%, 90%, 75-80%, in line with GB8978-1996 primary water discharge standards.
2. Agricultural wastewater management methods
Agricultural wastewater because of the wide distribution of scattered, difficult to collect and difficult to manage, so only the use of biological role of pollutants will be removed, such as high-density high-efficiency decontamination of bacteria, directly into the polluted water, in order to achieve the purpose of water purification.
3. Treatment of medical sewage
Hospital sewage treatment, usually including primary and secondary treatment. Generally speaking, if the treated water is discharged into the municipal sewers, usually only primary treatment; if the treated water is directly discharged into the river, it is necessary to carry out primary and secondary treatment; for the areas with strict discharge standards, in order to prevent the eutrophication of the water body, need to carry out phosphorus denitrification tertiary treatment. Special hospital wastewater such as acidic wastewater, phase-washing wastewater and radioactive wastewater should be strictly collected and treated. In some areas, in order to alleviate the contradiction of water supply tension, the deep treatment and recycling of hospital sewage has been carried out. The actual way of hospital sewage treatment should take into account a variety of factors such as the source of sewage, the flow of sewage and the local water supply. In addition, a very important aspect of hospital sewage treatment is that it must be disinfected to kill a variety of pathogenic microorganisms.
Two - sewage
〖Rural sewage treatment method〗
For rural sewage, the following treatment can be carried out:
Picture of rural sewage sewage sewage septic tank → anaerobic tank → artificial wetland (planted with well-developed roots, moisture-loving, strong absorption capacity of plantain, water onion, calamus and other plants) by the The method of "filtering" and then discharging is mainly applicable to the treatment of decentralized rural sewage, and the operation cost is basically zero after the completion of the project, and the service life is more than 10 years.
〖Urban sewage treatment method〗
Life sewage treatment process For urban sewage, the following treatment can be carried out:
Transporting the urban sewage to the rural areas around the city, the use of rural areas of the vast land to purify urban sewage. Will be once and for all with a good way to kill many birds with one stone. The daily supply of domestic tap water 100W cubic meters of large and medium-sized cities, for example: ordinary sewage treatment facilities cost 1000 yuan / cubic meters. Construction cost of 1 billion, the annual operating cost of 100W cubic meters / day × 365 × 0.5 yuan / cubic = 180 million. Using soil purification method construction cost of 1000 yuan / cubic meter, the annual operating cost of 100W cubic meters / day × 365 × 0.1 yuan / cubic = 0.4 billion. At the same time, the annual saving of agricultural water resources of 360 million cubic meters, saving fertilizer about 10,000 tons / year, reduce pesticide use 5 tons / year, the comprehensive benefits are considerable.