【Haichuan’s Best Practices】By using sludge drying, the sludge volume at Yangzi Petrochemical’s water treatment plant was reduced by 50%
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As of the end of August, the sludge drying unit of the Net II plant at Yangzi Petrochemical, which is part of the company’s environmental protection initiatives, has been operating steadily for over three months since its successful commissioning in May. The moisture content of the sludge has been reduced from 80% to 60%, resulting in a reduction of more than 50% in sludge volume, thereby contributing to the company’s efforts to become a green enterprise. The sludge drying project involves drying the sludge that has undergone biochemical treatment in the Net II unit. In the past, the sludge generated in the biochemical process of this facility was sent to Yizheng Chemical Fiber for treatment after being separated by flotation and then dehydrated using a centrifuge. This treatment process had several shortcomings: first, the moisture content of the sludge after dehydration via the centrifuge remained around 80%, resulting in low treatment efficiency ； Second, sludge with a high moisture content poses safety risks during transportation. To this end, the Net Two facility drew on the advanced experience of its sister units in sludge treatment, organized relevant personnel to carry out technical research, and formulated the \"Safety Technical Regulations for Electrodialysis Sludge Drying,\" the \"Process Technical Regulations for Electrodialysis Sludge Drying,\" and the \"Operation Plan for Electrodialysis Sludge Drying Facilities.\" This sludge drying project uses the electrodialysis method, which separates the sludge from water through selectively permeable membranes, thereby achieving sludge drying. The sludge drying project involves a long duration, tight deadlines, and high safety requirements. During the construction process, the contractor overcame difficulties such as hot weather by working overtime. Given that this project involves special operations such as hot work, excavation, working at heights, and lifting, which carry high safety risks, the Net Two facility strictly implemented the project’s \"dual supervision\" system, ensuring the safe completion of the sludge drying construction project. With the strong attention of leaders at all levels, the sludge drying project at Unit 2 was launched successfully on the first attempt. Through continuous optimization of its operation, it achieved the set target of processing 20 tons of sludge per day, thereby contributing to sludge reduction and environmental protection. (Tao Yan, Zhang Xian, Zhang Xiaochun)
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Using electrodialysis to dry sludge – that’s quite interesting. Could the original poster provide more details on it?
1) Principle of the electrodialysis plate-and-frame drying technology. The electrodialysis plate-and-frame dehydrator is developed on the basis of traditional high-efficiency diaphragm plate-and-frame dehydrators. Its operating principle combines various techniques such as traditional high-efficiency diaphragm plate-and-frame dehydration, electrodialysis dehydration, electroosmosis, and Brownian motion, in order to achieve the drying of sludge. Industrial 380V AC electricity is rectified into DC electricity; the resulting voltage is 75–85V, and the current ranges from 2000 to 15000A. Positive and negative electrode plates are installed on the filter plates of the plate-and-frame dehydrator, causing the sludge, which carries a negative charge, to move toward the anode, while water, carrying a positive charge, moves toward the cathode, thereby enabling the separation of sludge from water. 2) Advantages of the electrodialysis plate-and-frame drying technology: The advantages of electrodialysis plate-and-frame dehydrators are as follows: First, it is possible to reduce the moisture content from 99% to below 60% directly; second, only a small amount of PAM or coagulant aids are required; third, the overall operating cost is low, with drying costs ranging from 70 to 100 yuan per ton; fourth, the process requires less space, resulting in cost savings.
Thank you for sharing so selflessly! It would be best if this technology could function without the use of PAM; when PAM is used, it becomes difficult to dry 60% of the sludge to a moisture content of 10%. We hope that technological advancements will lead to lower treatment costs and improved treatment processes
It is possible to use a heat source to dry it down to below 30%, thereby reducing transportation and disposal costs; contact number: 13773773008
It is possible to use a heat source to dry it down to below 30%, thereby reducing transportation and disposal costs; contact number: 13773773008