Deep Water Treatment 2/4
Deep Wastewater Sewage Water Treatment is also called Advanced Treatment or Tertiary Treatment. It further conducts physical, chemical and biological treatment on the secondary treated water to effectively remove various impurities in the sewage, so as to meet the user's requirements for water quality.
There are several common technologys for Deep Sewage Treatment.
1. Activated Carbon Adsorption and Ion Exchange Wastewater Treatment Technology
2. Membrane Separation Technology
3. Advanced Oxidation Technology
4. Wet Oxidation Technology
5. Wet Catalytic Oxidation Technology
6. Supercritical Water Oxidation Technology
7. Photochemical Catalytic Oxidation Technology
8. Electrochemical Oxidation Technology
10.Ultrasonic Degradation Technology
3. Advanced Oxidation Technology
High concentration organic pollutants and toxic and harmful pollutants discharged from industrial production are of many kinds and great harm. Some pollutants are difficult to be biodegraded and have inhibitory and toxic effects on biochemical reactions. Advanced oxidation method generates highly active free radicals (such as OH) in the reaction, which can transform the refractory organic pollutants into easily degradable small molecule substances, and even directly generate CO2 and H2O, so as to achieve the goal of harmless treatment.
4. Wet Oxidation Technology
The wet air oxidation (WAO) process uses O2 or air as oxidant under high temperature (150~350 ℃) and high pressure (0.5~20 MPa) to oxidize organic or inorganic substances in water to remove pollutants. The final products are CO2 and H2O.
5. Wet Catalytic Oxidation Technology
Wet catalytic oxidation (CWAO) is a traditional wet oxidation process in which appropriate catalysts are added to enable the oxidation reaction to be completed in a more moderate condition and in a shorter time, thus reducing equipment corrosion and operating costs.
The catalysts for wet catalytic oxidation are generally divided into three categories: metal salts, oxides and composite oxides. Considering the economy, the most widely used catalysts are transition metal oxides such as Cu, Fe, Ni, Co, Mn, etc. and their salts. The use of solid catalyst can also avoid the loss of catalyst, secondary pollution and waste of funds.
6. Supercritical Water Oxidation Technology
The supercritical water oxidation method increases the temperature and pressure above the critical point of water, and the water in this state is called supercritical water. In this state, the density, dielectric constant, viscosity, diffusion coefficient, conductivity and solvent chemical properties of water are different from those of ordinary water. The higher reaction temperature (400~600 ℃) and pressure also accelerate the reaction rate, which can achieve high destruction efficiency for organic matter in a few seconds.
The supercritical water oxidation process was first applied to treat sludge on a large scale in Harrington, Texas, USA, with a daily treatment capacity of 9.8 t. The system operation has proved that the removal rate of COD is above 99.9%, the organic components in the sludge are all converted into CO2, H2O and other harmless substances, and the operation cost is low.
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