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Let’s first talk about the current electrodialysis water separation process in our facility. Electrodialysis is used to separate oily wastewater from it, sending the mixture to an oil separation tank. After oil and water are separated in this tank, the water proceeds to subsequent wastewater treatment units. The oil separated in the tank is pumped to an oil storage tank, where it is heated and allowed to settle; this process is repeated until the water content in the oil is below 1%. Only then is the oil sent to a vacuum distillation unit for further processing. The problems we are facing now are as follows: 1. Since our atmospheric and vacuum distillation units used to operate at low load, the amount of water that needs to be removed has increased significantly due to the higher volume of crude oil being processed. As the oil separation tanks are smaller, it is necessary to carry out operations to transfer the contaminated oil on a daily basis; it is estimated that about half of this contaminated oil actually consists of water. 2. After the contaminated oil is subjected to sedimentation and heating in the oil storage tank, water is separated from it; the COD level of this separated water is very high, which can place a strain on wastewater treatment plants. 3. The time required to treat wastewater in storage tanks is too long; based on the current frequency of water separation, several storage tanks are needed to hold the contaminated oil. After discussion, two methods for dealing with contaminated oil were considered: 1. Installing oil-water separation equipment after the water separation stage to improve the efficiency of oil-water separation; this would reduce the frequency of converting contaminated oil into usable oil. However, this method requires additional equipment, and considering the investment and space required for such equipment are issues that need to be taken into account. 2. The technical modification process directs the contaminated oil directly to the coking reprocessing unit, as there is a contaminated oil circulation system within the coking unit that allows for heating in order to evaporate the water; thereafter, quench water is used in the coking unit and injected into the coke tower. Dear sea friends, please share your opinions and discuss the feasibility and effectiveness of the second option! Are there any other difficulties that haven’t been taken into account? http://down.hcbbs.cc/attachment/forum/201706/10/203353z7y06fdo70r6eod0.jpg Petrochemical area—New ideas for energy conservation: the “Creative Ideas” campaign (the second phase is currently in full swing). http://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1666758 (Source: Haichuan Chemical Industry Forum) 2017: “My Technical Upgrades” in the coal chemical industry. http://bbs.hcbbs.com/thread-1786290-1-1.html (Source: Haichuan Chemical Industry Forum website) First round of voting for the best e-books on Haichuan Forum—Chance to win prizes by voting (for members of the Management and Technology Group and those in grade 5 or above). http://bbs.hcbbs.com/thread-1799455-1-1.html (Source: Haichuan Chemical Industry Forum website)
This post was last edited by ceybwang on 2017-7-27 08:12. The second option should be feasible; I heard some manufacturers mention it during a previous discussion. Additionally, I personally believe that the issue of excessive oil in the wastewater should be addressed at the source of electrodialysis; for example, after changes in the crude oil, is the demulsifier still suitable? Should the amount of demulsifier be adjusted? After the crude oil processing volume increases, is the residence time in the crude oil electrodialysis tank appropriate? If it is not suitable, is there a chance to change the electrodialysis technology (for example, from low speed to high speed)? How effective is the mixer? Is the setting of the electric desalination oil-water interface reasonable? What is the quality of water from electrodialysis? Wait.