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Low temperature ice water unit is a cooling equipment widely used in industrial, commercial, and medical fields. It can provide stable cooling temperature and ensure the temperature requirements of process equipment and environment. However, the use of low-temperature ice water units also comes with the issue of wastewater and exhaust emissions. This article will introduce the composition and treatment methods of wastewater and exhaust gas from low-temperature ice water units.
1、 Composition and treatment methods of wastewater from low-temperature ice water units
The wastewater from low-temperature ice water units mainly contains the following substances:
1. Cooling water
Cooling water is the main component of wastewater in low-temperature ice water units. It contains certain water-soluble substances and microorganisms, which need to be treated to meet the emission requirements. The treatment methods include sedimentation, filtration, disinfection, etc.
2. Sulfates and nitrates
If the water source in the low-temperature ice water unit contains sulfates and nitrates, it will be concentrated during the cooling process. These substances may pose hazards to the environment and health. The concentration of these substances in wastewater should be reduced by removing sulfates and nitrates from the water source. The treatment methods include RO reverse osmosis, ion exchange, etc.
3. Cleaning fluid and chemicals
The low-temperature ice water unit requires periodic cleaning and maintenance. These cleaning fluids and chemicals are important components of wastewater and may contain residual chemical substances. The treatment methods include neutralization, precipitation, ion exchange, activated carbon adsorption, etc.
The treatment methods for low-temperature ice water unit wastewater mainly include the following:
1. Biochemical treatment
Biochemical treatment is a commonly used method for treating wastewater, which can effectively remove organic matter from wastewater. It uses microorganisms to degrade organic substances in wastewater, converting them into carbon dioxide and water. Biochemical treatment methods include activated sludge method, contact oxidation method, biofilter method, etc.
2. Physical and chemical treatment
Physicochemical treatment is another commonly used method for treating wastewater. It uses physical and chemical methods to remove organic matter, inorganic compound and suspended matter in the wastewater, so that the wastewater can meet the discharge requirements. Physical and chemical treatment methods include precipitation, filtration, adsorption, oxidation, reduction, etc.
3. Membrane separation
Membrane separation is a relatively new wastewater treatment method that can effectively remove dissolved substances and microorganisms from wastewater. Membrane separation technologies include nanofiltration, ultrafiltration, RO reverse osmosis, etc.
2、 Composition and Treatment Method of Waste Gas from Low Temperature Ice Water Unit
The exhaust gas of the low-temperature ice water unit mainly consists of the following substances:
1. Nitrogen and oxygen
The exhaust gas of the low-temperature ice water unit contains a large amount of nitrogen and oxygen. As nitrogen and oxygen make up the majority of the air, their concentration is high and needs to be treated.
2. Fluorine gas and hydrofluoric acid
The refrigerant of the low-temperature ice water unit may contain fluorine gas and hydrofluoric acid. These substances are toxic and require treatment.
The treatment methods for waste gas from low-temperature ice water units mainly include the following:
1. Absorption
Absorption is a commonly used waste gas treatment method that can absorb harmful components from the gas into the absorption liquid, reducing the concentration of harmful components in the air. The absorption solution is generally alkaline or acidic, and commonly used absorbents include sodium hydroxide, calcium hydroxide, triethylamine, etc.
2. Activated carbon adsorption
Activated carbon can adsorb organic matter, volatile matter, and some chemical substances in gases, making it an effective waste gas treatment method. After activated carbon adsorption, harmful components in the exhaust gas will be fixed in the activated carbon.
3. Catalytic oxidation
Catalytic oxidation is a treatment method that converts harmful gases into harmless gases through oxidation reactions. It uses catalysts to promote oxidation reactions, converting harmful gases in the exhaust gas into carbon dioxide and water.
4. Low temperature plasma treatment
Low temperature plasma treatment is a highly efficient method of treating waste gas through low-temperature plasma technology. It uses an external electric and magnetic field to keep the gas in a plasma state, further decomposing harmful components in the exhaust gas.
conclusion
The wastewater and exhaust gas from low-temperature ice water units have a certain degree of impact on the environment and health. In order to protect the environment and human health, it is necessary to treat wastewater and exhaust gas. According to the composition of wastewater and exhaust gas, methods such as biochemical treatment, physicochemical treatment, and membrane separation can be used to treat wastewater; Waste gas can be treated by methods such as absorption, activated carbon adsorption, catalytic oxidation, and low-temperature plasma treatment. These methods can effectively reduce the harmful components in wastewater and exhaust gas, meet emission standards, and protect the environment and human health.
