Liaoning finds a good way to treat papermaking wastewater pollution

According to the instructions of the Provincial Party Committee Secretary of Liaoning Province, the Provincial Environmental Protection Institute took the lead and set up the "Papermaking Wastewater Treatment Technology Group of Liaoning Province." This group consists of 6 people. It went to Beijing, Anhui, Henan, and Shandong for investigation and investigation in 1999. It is to find the sewage treatment technology suitable for the medium and small paper mills in Liaoning Province as soon as possible.
After field inspections, they believe that most alkali paper pulp mills in Liaoning Province are difficult to pass technically and economically due to high ash waste and serious silicon interference. At present, under the premise that there is no better way, the papermaking wastewater treatment technology of Fujian Century Environmental Protection Company is more applicable to the actual situation in Liaoning Province.
The sewage treatment technology of Fujian Century Environmental Protection Company adopts a black- and mid-stage water (including white water) segmentation method. After the black liquor is first-stage anaerobic treatment, the acid-precipitating lignin is used, and then the second-stage boring is performed. After the oxygen treatment, the water is confluent with the water, and then the water purifier is added for physicochemical treatment, and finally discharged through the overflow of the flow-type sedimentation tank. The company's technology has been applied to nearly 30 paper mills in Fujian, Jiangxi, Shandong, Hebei and Henan provinces. For example, under the condition that the Henan Hua County Paper Mill is designed to process 15,000 tons of waste water per day, the project investment will be approximately 7.1 million yuan, the cost of operating tons of paper wastewater will be approximately 0.7-0.8 yuan, and the cost per ton of paper will increase by 210-240 yuan. (Pingzi)