What method is generally used for oil removal in electrodialysis?
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For vacuum distillation and electrical desalination, what method is used to remove oil? Is it by using a flash bottom pump directly, or by pushing water into the flash tower? We have an oil removal line connected to the inlet of the flash bottom pump, but it has never been used once
The bottom of the electrodialysis tank in our unit is equipped with a dedicated oil removal line, and oil is removed by using steam to push it out.
We have an oil rejection line at the lower part of the electrodialysis unit, at the inlet of the flash bottom pump; steam was not used for pushing the oil out during this process
We also have specialized oil removal pumps, but their effectiveness is poor – the oil cannot be removed completely. We use the method of pushing water against the oil in the flash tower, and this works very well.
We have a dedicated oil removal line; the oil is pumped to the tank area using specialized pumps, and then blown into the fractional distillation tower with steam, ensuring cleanliness each time.
We have directly installed an oil return line leading to the inlet of the flash bottom pump
The sediment at the bottom of the desalination tank is quite thick; here it’s usually between 50-80 cm. Therefore, using an oil removal line is not as effective as using water to flush out the sediment completely, followed by draining the water and using air to dry the sediment, which facilitates cleaning the tank.
Here we use water on top of the oil, followed by steam purging, but the results are not that ideal. However, the method suggested by the friend upstairs is worth considering; thank you for that!
Our electrodialysis unit also has a conventional oil removal line, but it has not been used since it was installed. During normal production, the method of removing the electrodialysis tank and then using water to flush it out is commonly employed, as it is convenient and fast.