Where is the cut water from electrodialysis recovered?
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The water resulting from electrodesalination generally has a high COD level, and sending it directly to the wastewater treatment system can cause certain stress on that system. We would like to recycle this water after treating it before sending it to wastewater treatment. Is it possible to use acidic water stripping for this purpose? Those with experience in recycling such water are welcome to share their insights!
Yes, the electrodialyzed water here must first go through wastewater stripping treatment, and then it is sent to wastewater stripping again.
If the oil content is high, it may be advisable to first carry out moderate sedimentation separation to recover a large amount of oil, and then send the separated water to a sewage stripping unit for treatment…
Generally, sedimentation and separation are carried out first, followed by entry into the acidic water stripping system.
This is exactly the situation we are facing now: the COD level in the wastewater discharged from the treatment plant is three times above the allowed limit, and this is caused by discharging water directly after electrodialysis. I would like to ask how to first proceed with sewage stripping, and then carry out sewage stripping again
It enters the non-hydrogenated acidic water treatment unit for stripping, and the purified water returns to the electrodialysis unit for reuse
The stripping unit does not consume COD. Acidic water stripping generally refers to the process in refineries of separating hydrogen sulfide from water containing it, through stripping. Stirring has little effect on COD. However, if the wastewater contains some volatile organic compounds, these will be removed along with the light components during the stripping process, thereby helping to reduce the COD level.
Important note: The water removed in the electrodialysis process does not pass through a stripping unit. Recently, the temperature of this water has been used to heat the gas used for combustion in the furnace
Treatment with a cyclone can separate most of the oil, which is then sent back for desalination.
By adding crude oil pretreatment agents in the crude oil storage area, 90% of the sediment, suspended particles, and impurities contained in the crude oil can be removed, thereby ensuring that the COD levels from electrodesalination processes and the oil content in wastewater meet the specified requirements
Cyclone treatment – our company had one set, but it was taken apart!