Dark water from the electrodialysis desalination tank

1. With oil； 2. The crude oil is dirty, containing debris ； 3. The water is dirty.

Blackening caused by electro-dehydration requires different approaches: 1. Blackening due to oil in the drainage fluid – there are two possible causes here. One is that the oil-water interface is too low, or there is excessive sediment in the tank. It is necessary to raise this interface as much as possible without affecting the operation of the transformer, thereby increasing the time that the oily wastewater stays in the tank; at the same time, backwashing should be carried out to remove the sediment at the bottom of the tank； Another possibility is that the demulsifier is not suitable, and it is necessary to re-screen for an appropriate one. 2. The raw materials are complex and contain excessive additives, resulting in a large amount of \"black ash\" impurities. These flocculent impurities cannot settle within the tank in a short period of time; instead, they are carried out of the tank along with the wastewater, causing the discharged water to turn black. Additionally, these impurities often carry some oil with them, so the wastewater also appears to have a high oil content.