What is the acceptable level of oil content in the sulfur-containing wastewater from atmospheric and vacuum distillation units? How to reduce oil in water?
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How to reduce oil content in acidic water through operational measures
If the opening degree of the dehydration control valve is too large and the water flow rate is too high, it’s easy for oil to be carried along. Is the dehydration control valve in automatic mode? It is necessary to adjust an opening range that allows water level control without any oil present
Raise the level gauge setting of the reflux tank appropriately, especially that of the water-sealing tank used to reduce pressure; it’s best to keep it at a high level. Currently we set it around 70, and the acidic water contains basically no oil.
Generally, the oil content in acidic water is required to be less than 500 ppm
Acidic water for oil removal, capable of removing up to 200 ppm
Adjust the lower limit for indoor and outdoor use to keep it at a reasonable level; if the limit is too low, oil may be carried over, while if it’s too high, water may be carried over as well. Check whether the amount of neutralizer added is too high; sometimes, an excessive amount of neutralizer can cause emulsification between water and oil, resulting in the water containing some oil.
What does a neutralizer refer to? :handshake
Neutralizing corrosion inhibitors, which serve to adjust the pH of acidic water and provide corrosion inhibition.
Oil content in the cutwater from Jiujiang Petrochemical’s atmospheric and vacuum distillation process
We can use chemicals to extract this portion of oil, in ppm levels. If the oil content is 500 ppm, it can be reduced to below 100.