How should paper mills recycle papermaking wastewater-Jinling Paper Machine

　　Papermaking wastewater is formed by black liquor, beater wastewater and paper machine wastewater. The recycling of papermaking wastewater is also aimed at the recovery of these three types of wastewater. How many recycling methods are available for papermaking wastewater treatment equipment?

　　Recycling of black liquor from papermaking

　　The recovery and treatment of papermaking black liquor is the most critical for wastewater treatment. The treatment technology of recycling papermaking black liquor can be divided into alkali recovery method, flocculation sedimentation method, membrane separation method, acid precipitation method, active sludge method and biotechnology method, etc. . Alkali recovery method is currently the most mature and widely used papermaking black liquor treatment method.

　　The alkali recovery method is widely used, so the combustion method, electrodialysis method and black liquor gasification method can also be derived according to different principles.

　　The process of the combustion method is divided into four processes: extraction, evaporation, combustion, causticization, and lime recovery. Although the process is mature and stable, the project investment is relatively large and is only suitable for larger-scale paper-making enterprises.

　　The electrodialysis process is a circular process in which the black liquor circulates through the anode chamber and the dilute lye is circulated through the cathode chamber. The dialysis method has the advantages of simple process, convenient operation, low equipment investment, and easy automation.

　　The black liquor gasification method is to gasify the black liquor in a high-temperature fast reactor to turn the organic matter into a clean fuel gas that can be used by a gas turbine. It is more effective than traditional combustion and recycling, and is environmentally friendly. It is a promising technology for energy production and recycling in the pulp and paper industry.

　　According to the analysis of the three methods, the combustion method can fully and comprehensively recycle resources, which is more suitable for large papermaking enterprises. However, my country's papermaking enterprises are more popular in small and medium-sized paper mills, and these enterprises do not have alkali recovery system operation. You can refer to the other two ways of Qi.