Wastewater treatment
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Our company’s wastewater includes domestic wastewater, electrodialysis wastewater, air lift wastewater, and naphthenic acid neutralization wastewater. At present, the wastewater is treated separately for production-related wastewater and domestic wastewater; the treatment volumes are 40 and 10 respectively, and the treatment process involves oil separation, air flotation, and biological treatment. During the environmental impact assessment, experts suggested that saline wastewater should be treated separately. Personally, I think it is unreasonable for the following reason: electrodialysis wastewater is saline, and naphthenic acid neutralization wastewater is also saline; there is little wastewater that is free of salts, so combined treatment is a better option. Please share your valuable insights. Thank you
Whether to handle them separately depends on which method is more cost-effective; in my opinion, handling them separately is more economical.
Treat some of it separately; treated domestic wastewater should ideally be recycled.
Biological treatment methods cannot handle wastewater with high salt content. If it is only the salt level that is high, and ammonia nitrogen or COD levels are within acceptable limits, such wastewater can be discharged directly without causing environmental pollution. There is no need to combine it with domestic wastewater, as the total salt content does not decrease after mixing; only its concentration is reduced. Salt cannot be removed, and it accumulates within the system, eventually requiring external discharge
I agree with this view; wastewater with a high salt content cannot be treated by biological treatment methods, but it can be treated through electrodialysis and membranes
Water with high salt content has an inhibitory effect on biochemical treatment; I think it is reasonable to treat saline wastewater separately before the biochemical process. If all the amounts of water and its components can be clearly specified, I believe everyone can continue to discuss whether the existing processes are appropriate.
High salt content in wastewater can kill microorganisms and inhibit biochemical treatment processes. Pre-treatment methods such as electrolysis are often required. Domestic sewage can be directly fed into biochemical treatment systems. In water treatment technologies, the principle is to separate substances whenever possible rather than combining them. However, in practice, decisions must be made based on specific circumstances; for example, combined treatment may be more cost-effective or it might yield other advantages such as reducing concentration or diluting the water
I’ve roughly understood what the original poster meant. Some of the friends mentioned above also said it’s best to handle them separately, and that’s correct. However, given that the water volumes mentioned by the original poster are 40 and 10 respectively, treating them separately would inevitably require significant additional investment, and it is not very economical to treat and reuse such small amounts of water at this stage. If there are no policy requirements forcing you to reuse or separate them, it is recommended to choose a method with low costs.
It depends on the concentration of the saline wastewater; it is necessary to calculate whether the total salt concentration after mixing will inhibit biochemical treatment. For example, if the chlorine concentration is below 500 PPm, then mixing for treatment is possible. This is just my personal opinion; I welcome corrections from those with more expertise
Chloride at 8000 ppm can also be biochemical. I have done it.
The salts contained in crude oil are mainly calcium chloride, sodium chloride, and magnesium chloride, with a total concentration of 132 ppm in the crude oil. The water injection rate is currently set at 5%. The other salts are mainly sodium sulfate, about 100 kilograms per day. Experts, please share your insights
It’s more economical to handle them separately; therefore, what was said on the fourth floor makes quite sense as well. It depends on the company’s situation to decide. Biological treatment methods cannot handle wastewater with high salt content. If it is only the salt level that is high, and ammonia nitrogen or COD levels are within acceptable limits, such wastewater can be discharged directly without causing environmental pollution. There is no need to combine it with domestic wastewater, as the total salt content does not decrease after mixing; only its concentration is reduced. Salt cannot be removed, and it accumulates within the system, eventually requiring external discharge
At present, most high-salt wastewater is treated to achieve zero discharge through membrane concentration plus evaporation concentration, but the cost is too high, so this approach is not widely used
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