Papermaking wastewater is a common industrial wastewater. Due to its complex organic components, it has a serious impact on the environment. In order to protect the environment, many papermaking enterprises have adopted wastewater treatment processes.
1. Chemical treatment method
Chemical treatment method is a commonly used method for treating papermaking wastewater. This method mainly converts organic matter in wastewater into harmless substances through chemical reactions, thereby achieving the purpose of purifying wastewater. Chemical treatment methods mainly include oxidation, reduction, neutralization, coagulation and other reactions. During the treatment process, different chemical agents such as oxidants, reductants, coagulants, etc. need to be used. The advantages of chemical treatment methods are good treatment effect and fast speed, but the disadvantages are high treatment costs and possible secondary pollution.
2. Physical treatment method
Physical treatment method is a relatively simple method for treating papermaking wastewater. This method mainly separates suspended matter, chromaticity, turbidity and other substances in wastewater through physical action, thereby achieving the purpose of purifying wastewater. Physical treatment methods mainly include precipitation, filtration, centrifugal separation and other methods. The advantages of physical treatment methods are low treatment costs and simple operation, but the disadvantages are relatively poor treatment effects.
3. Biological treatment method
Biological treatment method is an environmentally friendly papermaking wastewater treatment method. This method mainly converts organic matter in wastewater into harmless substances through the action of microorganisms, thereby achieving the purpose of purifying wastewater. Biological treatment methods mainly include activated sludge method, biofilm reactor and other methods. The advantages of biological treatment method are good treatment effect and high environmental protection, but the disadvantage is slow treatment speed.
4. Combined treatment method
Combined treatment method is a papermaking wastewater treatment method that comprehensively uses the above methods. This method mainly achieves the best treatment effect by combining different treatment processes. Combined treatment methods mainly include chemical + physical, physical + biological methods. The advantages of combined treatment method are good treatment effect and fast speed, while reducing treatment costs, but the disadvantage is that the combined process needs to be adjusted according to different wastewater conditions.
5. Membrane separation technology
Membrane separation technology is a new type of papermaking wastewater treatment technology. This technology mainly separates organic and inorganic matter in wastewater through the filtration of membranes, thereby achieving the purpose of purifying wastewater. Membrane separation technology mainly includes microfiltration, ultrafiltration, nanofiltration and other methods. The advantages of membrane separation technology are good treatment effect, fast speed, and high separation efficiency, but the disadvantage is that the manufacturing cost of the membrane is high, and the membrane components need to be replaced regularly.
6. Photocatalytic oxidation technology
Photocatalytic oxidation technology is a new type of papermaking wastewater treatment technology. This technology mainly converts organic matter in wastewater into harmless substances through photocatalysis, thereby achieving the purpose of purifying wastewater. Photocatalytic oxidation technology mainly includes methods such as the use of semiconductor photocatalysts (such as TiO2). The advantages of photocatalytic oxidation technology are good treatment effect, high environmental protection, and low treatment cost, but the disadvantage is that catalysts are required and the pH value of wastewater is required to be high.
The papermaking wastewater treatment process needs to select different treatment methods according to different wastewater conditions. In practical applications, we need to comprehensively consider factors such as treatment effect, cost, and environmental protection to select the most appropriate treatment method. At the same time, we also need to continuously explore new treatment technologies, improve the efficiency and effect of wastewater treatment, and make greater contributions to environmental protection.
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