In the future, only 2 cubic meters of water are ne

In the future, only 2 cubic meters of water will be needed to produce a ton of paper

in the future, only 2 cubic meters of water will be needed to produce a ton of paper. As long as the technology is qualified, the papermaking process will take about 3 days, and water can even be recycled infinitely! Recently, at the Fourth International Conference on pulping, papermaking and biotechnology, Professor Dai Hongqi of Nanlin University introduced the water recycling technology in papermaking production process and the research progress of low quantification of paper, in order to realize the clean production, resource conservation and environment-friendly prospect of papermaking

according to reports, China's paper production reached 100 million tons in 2011, with an average of about 20 cubic meters of water per ton, which consumes a lot of water resources and also has a great impact on the ecological environment. In the process of papermaking, the substances dissolved in raw materials can only reach a certain load quality and the chemicals added in the production process each time they are loaded. When the paper is formed, they are not well adsorbed on the fiber surface and brought out of the wet end system. They enter the white water with the filtrate and become the pollutants of the process water. Professor Dai made an account: Based on China's paper and paperboard output of 100 million tons in 2011 and 20 cubic meters of water per ton, the annual water consumption in papermaking is as high as 2 billion cubic meters! In view of this problem, Professor Dai proposed to treat the discharged wastewater through chemical and membrane equipment technology, so as to realize the recycling of papermaking water without affecting the stable operation of equipment and process. Just like the human blood system, if the renal function is defective and the concentration of uric acid is too high, the uric acid in the blood can be separated and cleared through hemodialysis, and the purified blood can be transmitted back to the human body to maintain the normal function of the human body. Professor Dai made an analogy with. The so-called pollutants mean that the accumulation of substances dissolved into the process water exceeds the limit of maintaining the stability of the system and product quality. If the chemical adsorption transfer, combined with the physical separation technology, is the same as the principle of hemodialysis, as long as it can meet the minimum requirements of the production system, the water in the paper production process can be recycled indefinitely. At the same time, the so-called pollutants in the process water can also be reused

in addition, starting from the source of pollution, it is necessary to have a better understanding of the composition of paper-making raw materials, master the laws and characteristics of paper-making system, seek suitable technology, and find a breakthrough through process control and equipment. The accumulated pollutants in the process water are actually resources that can be used. Due to the small amount or no suitable use for the time being, we just hope to eliminate the accumulation or resource utilization of pollutants through some chemical control transfer and physical separation methods, reduce the waste of resources, and realize the cleaner production of papermaking. Professor Dai said: at present, several paper mills in Jiangsu are experimenting. After preliminary prediction, the implementation of this concept can reach 1 ton of paper. Adding simple accessories and devices only uses 2 cubic meters of water, which greatly saves water consumption and leads the technological progress of the whole industry after basic drying, which is of universal significance

in addition, due to the small amount of wood resources and the low utilization rate of straw in China, it is particularly important to save fiber raw materials. Professor Dai told that through the three-dimensional enhancement of paper and paperboard, low quantification of paper or paperboard can be achieved. For example, 50g/m2 copy paper can reach the application effect of 70g/m2 copy paper. However, there are some problems in the low quantification of paper or paperboard, such as the decline of paper opacity and insufficient stiffness, which are still under further study