Guangxi Jingui Pulp & Paper Co., Ltd., a subsidiary of APP (China), pursues zero emission control of pollutants in the pulp and paper industry, boldly innovates, and breaks through the traditional pollution control methods of the paper industry. The floating process has achieved a revolutionary leap in the control of chemical machine pulp pollution in China.
Innovation 1: Introduce alkali recovery and intercept sewage in the first stage
The alkali recovery process was originally used by the chemical pulp production system to recover the alkali in the production process for reuse. Due to the large amount of waste water and high lignin content generated in the production process of large-scale chemical pulp, it is easy to concentrate the waste water and burn it in an alkali furnace to achieve alkali recovery. However, the lignin content in the wastewater generated by the chemical machine pulp in the production process is low. The traditional wastewater treatment process directly discharges the wastewater discharged from the production line to the wastewater treatment plant for treatment. The COD concentration of the wastewater entering the wastewater treatment plant is as high as 12000ppm The amount is also very large, which directly causes the overload operation of the chemical pulp wastewater treatment plant, and the pollutant treatment effect is very poor.
The Jingui Pulp and Paper project initially used traditional processes to treat pollutants and was approved by the Ministry of Environmental Protection. However, during the construction of Jingui Pulp and Paper Company, it boldly innovated to overcome the problem of too low lignin content in chemical machine pulp wastewater and not easy to concentrate and burn. It provided an alkali recovery system for the chemical machine pulp production line, which made the COD concentration discharged from the chemical machine pulp workshop It is 12,000ppm of wastewater. After being treated by the alkali recovery system, 95% of the main pollutants in the wastewater are removed. The COD concentration when discharged into the sewage treatment plant is only 600ppm. Most of the pollutants in pulp and paper are intercepted in sewage treatment Outside the factory.
Innovation two, increase the high-speed filter decontamination in the middle section
The traditional chemical pulp wastewater treatment of the paper industry, the sewage entering the adjustment tank is filtered by a diagonal net to partially suspend organic pollutants, but this treatment method has a poor removal rate of pollutants, and the treatment process is mainly manual. The degree of automation is very poor. When the sewage treated by the inclined net enters the biochemical treatment tank (SBR tank), the pollutant removal rate is only about 10%.
Jingui Pulp & Paper innovated the process at this stage of treatment, introduced a high-speed filter to deal with suspended organic pollutants, and used electronically controlled mechanical operations to realize the automation and unmannedness of this process. This change has increased the removal rate of suspended organic pollutants in wastewater from 10% to 30%, and the filtered slurry has been completely recovered.
Innovation III, the end of the transformation of air floatation tank cleaning
In the traditional chemical mechanical pulp wastewater treatment process, the air floatation tank is set between the regulating tank and the biochemical treatment tank to treat the fibers discharged into the wastewater during the production of the pulp line. After the wastewater is treated by air floatation, it is directly discharged by biochemical treatment, but at this time, the discharged wastewater has poor pollutants, color, suspended matter and senses, so the discharge standards for pollutants in traditional chemical machine pulp production lines are all Lower.
After the wastewater from the Jingui pulp and paper production line is processed by alkali recovery and high-speed filters, more than 95% of the main pollutants have been treated. In order to further improve the level of discharged sewage treatment, Jingui pulp and paper scientifically changed the treatment process of sewage after it came out of the regulating tank, reformed the air floatation process, placed it at the end of wastewater discharge, and carried out in-depth treatment of the biologically treated sewage again. The pollutants, chromaticity, suspended matter and senses of the wastewater have been improved, and the discharge not only ensures that the invisible pollutants reach the standard, but also further optimizes the indicators of the discharged wastewater.
On the road of energy saving, emission reduction and clean production, APP (China) has written the miracle of environmental protection history of China's paper industry with consistent efforts and improvements. Guangxi Jingui Pulp & Paper Co., Ltd. has bold technological innovation and advanced environmental protection concepts. It is the perfect interpretation of this miracle to pursue a zero-emissions in the paper industry with a revolutionary process.
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