Water treatment four major systems :
1. Preparation system: consisting of pretreatment and reverse osmosis seawater desalination. Pretreatment includes a sand filter and an activated carbon filter, which can be referred to as ZD subsequent desalination and decompression. Reverse osmosis desalination is mainly a two-stage reverse osmosis device, which is the core of the entire purified water system and ensures the quality of the effluent.
2.Control system: A control method combining centralized control and on-site control is adopted to monitor important indicators such as pressure, conductivity, and water temperature.
3. Disinfection system: ultraviolet reflux pasteurization and plate heat exchanger.
4. Distribution system: A distribution system consisting of a closed loop pipeline and a purified water storage tank system, in which the circulation pipeline uses forced circulation water supply, and the pipeline uses sanitary grade stainless steel pipes. The pipes are connected through quick opening clamps, and each water point is connected in series. The purified water storage tank uses polished stainless steel tanks with inner and outer walls.
Water treatment devices include:
Filtration equipment: high-precision filters such as precision filters and bag filters; Quartz sand filter, manganese sand filter, mechanical filter, carbon steel filter, activated carbon filter, and other media filters; FRP softened water filter; Ion exchange resin column equipment: used for water treatment equipment coarse filtration: refers to mechanical filtration to remove suspended solids, colloid, turbidity, chromaticity, odor, etc. from water. The main filtration methods include clarifier, rapid filter, sand filter, sand filter, multi-media filter, activated carbon filter, disk filter, high-efficiency fiber filter, etc. Fine filtration: A filter membrane made of special materials with high filtration accuracy. The common types are microfiltration membrane and filter element filtration. Ultrafiltration: A type of membrane filtration that removes macromolecules, colloids, bacteria, etc.
High filtration accuracy, commonly known as ultrafiltration membranes. Ultrafiltration membrane cannot remove ions from water, that is, it has no desalination function. Used for reverse osmosis pretreatment or polishing after reverse osmosis, it can also be used alone. Ultrafiltration is a fluid tangential flow and pressure driven filtration process that separates particles according to their molecular weight. The pore size of the ultrafiltration membrane is in the range of approximately 0.002-0.1 microns. Dissolved substances and substances with a smaller pore size than the membrane can pass through the membrane as a permeate, while substances that cannot pass through the membrane are concentrated in the effluent. Therefore, the produced water contains water, dissolved solids, and small molecular weight substances, while colloids, suspended particles, high molecular weight organic matter, bacteria, viruses and protozoa will be filtered and removed.
Influencing factors on the use effect of water treatment equipment:
I. Loading :The load of the biotreatment reactor should be controlled within a reasonable range.
2. Water temperature: Water temperature is one of the important factors. Within a certain range, with the increase of temperature, the rate of biochemical reaction and proliferation rate increase. Cell components such as protein and nucleic acid are very sensitive to temperature. When the temperature rises or falls beyond a certain limit, it will be irreversible damage.
3. pH value: The better pH value for growth activity of aerobic microorganisms is between 6.5 and 8.5, while that for anaerobic microorganisms is between 6.8 and 7.2.
4. Oxygen content: Dissolved oxygen concentration in the mixing solution at the outlet of air aeration tank should be maintained at about 2mg/L, while anaerobic microorganisms must survive in an extremely low oxygen content or even anaerobic environment.
5. Nutrition balance: unbalanced nutrients in sewage will affect the activity of microorganisms and the effect of treatment equipment.
6. Toxic substances: If the content of toxic substances in sewage exceeds the limit, it will affect the activity of microorganisms and the effect of treatment equipment.
