Questions about electrodialysis desalinated wastewater
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Dear colleagues in the vacuum distillation field, does the electrodialysis wastewater from your units contain oil? Where is it usually taken for disposal?
The newly installed units may be equipped with a water-cutting and oil-recovery system, which can recover some of the contaminated oil； Old installations generally discharge directly into the sewage treatment plant, though some have oil separation tanks before sending the wastewater to the treatment plant.
Electrodesalination water always contains some oil; we are sending it to the wastewater treatment plant
Dongying Demei Petroleum Equipment Company possesses cyclone oil removal equipment that utilizes the pressure at the outlet of oily wastewater to achieve an oil removal efficiency of over 95%; the separated dirty oil is then sent back to the electrodesalination unit, thereby effectively reducing the load on wastewater treatment and the amount of aged oil.
Entering the coking tank, an oil skimmer is used to recover the contaminated oil for use as quench oil in the coking process
With proper control, oil is generally not present in the water. The water discharged at our second stage is very clear. Initially, it was planned to send this water to the sewer through electrodesalination units, but we later changed that to sending it via sealed pipelines to the sewage treatment plant’s centrifugal oil removal equipment
As long as the demulsifier is effective, oil contamination is generally not an issue; if oil is present, an oil separation tank is installed within the system, and the oil is then collected and sent to a treatment tank for processing
Is your demulsifier not effective? ? 、、
The demulsifier chosen is not appropriate, and it is also unclear whether the settling time required for the crude oil’s properties is sufficient
Our electrodialyzed wastewater is sent to a wastewater treatment facility, where the oil content is extremely low.
Under normal conditions, the water used for cutting is clean water or slightly darkish clean water; emulsified oil is generally not used as long as the current level is not too high. Pay attention to adjusting the demulsifier