The sludge in the aeration tank for refinery wastewater treatment is grayish-white
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Our company is an oil refining enterprise with a relatively short industrial chain; the main types of wastewater involved are those from atmospheric and vacuum distillation as well as catalytic cracking. For some reason, the sludge in the aeration tanks has been grayish-white recently, which is not the color of normal activated sludge. In the currently in use aeration tanks, the sludge is mainly gray-brown; it’s acceptable, but as soon as there is a change, it quickly turns gray-white. :(The current pH value of the sludge return stream is relatively low, around 6, and the sludge settling ratio is approximately 30. I hope everyone can help figure out what’s going on. This post was last edited by ppm1234 on 2008-2-22 22:13]
The description is too brief; I hope there are pictures and other parameters – it seems that the sludge no longer has any activity
May I ask, what other parameters are needed? Please explain, so I can provide it as well. The DO at the end of the aeration tank is around 4 mg/L.
Based on what you’ve said, it might be related to the pH value; generally, the optimal pH for activated sludge lies between 6.5 and 8.5
It’s frustrating – now our aeration tank has turned black. Whenever water and sludge enter that tank, it turns black. I hope the experts can provide their opinions as soon as possible; otherwise, our aeration tanks will be ruined.
It’s normal; bacteria also need a time to adapt to the incoming water. We have encountered similar situations before
The bacteria may already be starting to die in large numbers; hurry up and do a microscopic examination! This post was last edited by Bincheng Watcher on 2008-2-29 at 15:20.]
My suggestion is to check whether the load on the aeration tank has been too high recently; it’s possible that the microorganisms are not adapted to the wastewater. The wastewater can be diluted to re-acclimate the bacterial strain.
It’s mainly a pH value issue; I’ve encountered this problem as well. A low pH value can cause the sludge to turn white
Regarding this issue, we would appreciate more help from Hai Chuan’s friends; we have encountered the same problem as well