[Dry goods] industrial wastewater treatment technology do you know several?
Membrane Technology
Membrane separation method commonly used microfiltration, nanofiltration, ultrafiltration and reverse osmosis and other technologies. As membrane technology does not introduce other impurities in the process of treatment, can achieve the separation of macromolecules and small molecules, it is commonly used in the recovery of various macromolecular raw materials, such as the use of ultrafiltration technology to recycle printing and dyeing wastewater polyvinyl alcohol slurry. At present, the main difficulties in promoting the application of membrane technology engineering are the high cost, short life span, easy contamination and scale fouling. With the development of membrane production technology, membrane technology will be more and more applications in the field of wastewater treatment. Industrial Sewage Treatment Equipment Magnetic Separation Technology
Magnetic separation technology is a new type of water treatment technology developed in recent years that utilizes the magnetic separation of impurity particles in wastewater. For non-magnetic or weakly magnetic particles in water, magnetic inoculation can be used to make them magnetic. Magnetic separation technology for wastewater treatment has three methods: direct magnetic separation, indirect magnetic separation and microbial - magnetic separation. The magnetic technology currently studied mainly includes magnetic agglomeration technology, iron salt co-precipitation technology, iron powder method and ferrite method. Representative magnetic separation devices are disk magnetic separators and high-gradient magnetic filters. At present, the magnetic separation technology is still in the laboratory research stage and can not be applied to actual engineering practice.
Fenton and Fenton-like oxidation
The typical Fenton reagent is catalyzed by Fe2 + H2O2 decomposition generated? OH, which led to the oxidative degradation of organic matter. Due to the long time required to treat wastewater with Fenton process, the amount of reagent used is large, and excess Fe2 + will increase the COD in the treated wastewater and cause secondary pollution. In recent years, people introduced UV light and visible light into Fenton system and studied the use of other transition metals instead of Fe2 +. These methods can significantly enhance the oxidative degradation of organic substances by Fenton reagent, reduce the dosage of Fenton reagent and reduce the processing cost, collectively referred to as Fenton reaction. The Fenton method has the advantages of mild reaction conditions, simple equipment and wide application range; it can be applied as a separate treatment technology or combined with other methods such as coagulation sedimentation, activated carbon, biological treatment and the like, Degradation of organic wastewater pretreatment or depth treatment methods.
Ozone oxidation
Ozone is a kind of strong oxidant, which is fast and easy to use when reacting with reduced pollutants. It does not produce secondary pollution. It can be used for disinfection, color removal, deodorization, organic removal and COD reduction of sewage. Ozone oxidation alone, high cost, high processing costs, and its oxidation selectivity, for some halogenated hydrocarbons and pesticides, such as relatively poor oxidation. Therefore, in recent years, related technologies have been developed to improve the efficiency of ozone oxidation. The combination of UV / O3, H2O2 / O3 and UV / H2O2 / O3 can not only improve the oxidation rate and efficiency, but also oxidize the ozone alone Hard to oxidative degradation of organic matter. Due to the low solubility of ozone in water, low efficiency of ozone generation and high energy consumption, it increases the solubility of ozone in water and increases the utilization rate of ozone. Therefore, developing an ozone generator with high efficiency and low energy consumption has become the main research direction.
Wet (catalytic) oxidation
Wet (catalytic) oxidation is carried out under high temperature (150-350 ° C) and high pressure (0.5-20 MPa) using O2 or air as the oxidant (adding catalyst) under the action of the catalyst. The catalytic oxidation of water is in a dissolved or suspended state Of organic or reduced inorganic, to achieve the purpose of removing pollutants. Wet air (catalytic) oxidation can be applied to the treatment of municipal sludge and industrial wastewater such as acrylonitrile, coking, printing and dyeing, and pesticide wastewater containing phenol, chlorocarbon, organic phosphorus and organic sulfur compounds.
Plasma water treatment technology
Low-temperature plasma water treatment technology, including high-pressure pulsed discharge plasma water treatment technology and glow discharge plasma water treatment technology, is the use of discharge directly in aqueous solution to generate plasma, or gas discharge plasma in the active particles into the water, Water pollutants can be completely oxidized, decomposition. The direct pulsed discharge in aqueous solution can be operated at normal temperature and pressure. The oxidative degradation of organic matter can be produced in situ by chemical oxidizing species in aqueous solution without the addition of catalyst during the entire discharging process. This technique is economical and effective for the treatment of low concentration organic matter . In addition, the use of pulsed discharge plasma water treatment reactor technology can be flexibly adjusted form, the operation is simple, the corresponding maintenance costs are lower. Due to the limitation of the discharge equipment, the energy utilization rate of the degraded organic matter in the process is relatively low, and the application of the plasma technology in the water treatment is still in the research and development stage.
Electrochemical (catalytic) oxidation
Electrochemical (catalytic) oxidation technology directly degrades organic matter through anode reaction, or generates hydroxyl radicals (? OH) through anodic reaction, and oxidants such as ozone can degrade organic matter. Electrochemical (catalytic) oxidation includes one-, two-, and three-dimensional electrode systems. Due to the three-dimensional electrode system of micro-electric field electrolysis, currently highly respected. The three-dimensional electrode is filled with granular or other chip-shaped working electrode material between the electrodes of a traditional two-dimensional electrolytic cell and charges the surface of the charged material to become the third pole, and an electrochemical reaction occurs on the surface of the working electrode material. Compared with the two-dimensional plate electrode, the three-dimensional electrode has a large specific surface area, can increase the surface area ratio of the electrolytic cell, can provide a larger current intensity at a lower current density, has a smaller particle pitch and has a higher mass transfer rate, space- High efficiency, high current efficiency, good treatment effect. Three-dimensional electrodes can be used to deal with domestic sewage, pesticides, dyes, pharmaceuticals, phenol-containing wastewater and other refractory organic wastewater, metal ions, landfill leachate.
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