Are there any issues with the fractional oil and gas separator for reinjecting high-COD acidic water?
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My unit is a catalytic device that includes the desulfurization and purification of liquefied gas. The liquefied gas purification unit generates acidic water with a high COD level and an unpleasant odor; such water is difficult to treat in the subsequent wastewater treatment units. Currently, the workshop plans to send this acidic water to the oil-gas separator in the distillation unit. The idea is for the acidic water to enter the distillation reflux tank, be sent for absorption and stabilization, and then be discharged from the unit through the existing process to the wastewater stripping unit； Is it possible for this to affect the quality of gasoline? ； Or does it simply cause the acidic water from the device to have a high COD level? Refined acidic water absorbs stable acidic water: Sulfides, mg/l – 372, 1723; COD, mg/l – 93100, 6165; Ammonia nitrogen, mg/l – 641, 2067. The refined acidic water is produced in the liquefied gas refining unit; due to design issues, the flare pipeline is connected to the pipeline network, and the gases from various units in the plant converge there, with some of them condensing into acidic water ； Absorbing and stabilizing the acidic water generated by the catalytic device ； Please discuss what the consequences might be.
Feeding high-COD acidic water into a fractional oil-gas separator can lead to several problems: 1. Contaminated products: The high COD and other pollutants in the acidic water may migrate into gasoline, negatively affecting the quality of the final gasoline product. 2. Equipment corrosion: Acidic water contains high concentrations of sulfides and other corrosive substances, and handling such water over time can accelerate the corrosion and wear of equipment. 3. Handling pressure: If the separator is not designed to handle water with high COD levels, it may affect the proper operation of the equipment and its efficiency in treatment. 4. Environmental risks: Acidic water that is not properly treated may be discharged into the environment through equipment, causing environmental pollution. It is recommended to pre-treat the acidic water or find other methods to reduce its COD value and corrosive components before re-injecting it, in order to ensure equipment safety and product quality. At the same time, detailed technical evaluations and tests should be conducted to ensure the feasibility and safety of the treatment plan. .
The amount of acidic water in this portion is relatively small, about 1 ton per 3 days, and it does not meet the conditions for pretreatment; the main concern is that it may affect the quality of gasoline. If there is an impact, what will it cause? In which aspects will it fail to meet the requirements?