The color of the wastewater from oil fields turns yellow after treatment
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The wastewater treatment in my workplace relies on oil removal followed by filtration. However, the water coming out of the oil removal tank is yellow in color; its color does change after filtration, but it remains quite yellow when it reaches the injection wells. What could be the cause of this, and are there any effective solutions?
This post was last edited by 18 on 2009-5-5 09:07. The problem lies in the techniques and equipment you are using; if you are interested, you can visit the projects we have completed. We have practical examples of projects where oil extraction wastewater has been treated and then reinjected into oil fields in places such as the Changqing Oil Field, the Yanchang Oil Field, and Yancheng in Jiangsu Province. Moreover, our company owns its own patented technologies.
Of course, water quality varies from place to place, and specific situations should be addressed accordingly. If everything is normal, you might want to consider whether too much medication was added
It is possible to consider testing the quality of the water used for injection first, and then analyzing the reasons based on the results
The water quality should be analyzed; it would be best to conduct an experiment to determine the exact cause
It is likely iron corrosion; due to excessive oxygen in the wastewater, ferrous iron was converted into ferric iron.
First, analyze the water quality to determine whether it is caused by organic substances or metals; only after identifying the cause can appropriate measures be taken
It could be due to severe corrosion, or the presence of soluble organic substances
The wastewater from our factory is the same; it’s probably due to iron ions
+Ferrous ions have a light yellow color; after being left for some time, they are oxidized by oxygen in the air to become ferric ions. This can be resolved by using a strong oxidizing agent for oxidation.
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I also visited the oil and grease wastewater treatment plant; the effluent is a bit yellowish. I think it’s due to iron or organic substances in the water. It would be better to analyze the water sample first to determine its quality before discussing further
Strictly speaking, this statement is incorrect, because ferric ions generally exist in the form of iron hydroxide in water with a pH greater than 4, and it is unlikely that they will cause wastewater to turn yellow; however, this may happen in acidic water.
It can’t be sulfur-containing, right? It may contain more iron ions.
This should first be tested by the water quality laboratory in your factory’s testing center; specific issues need to be analyzed on a case-by-case basis
It could be the result of iron corrosion; the iron content in the water can be tested. It is also possible that humic acid is dissolved in the water