What are the effects of oil content on biochemical treatment? What is the upper limit for water inflow?
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The effect of oil accumulation has a significant impact on biochemical processes; with a certain level of accumulation, when the oil content in the incoming water is less than 40 mg/l, the biochemical oil content can rise to over 1000 mg/l. I wonder if other professionals in this field have encountered such a phenomenon?
Oil is harmful to microorganisms, but this argument mainly applies to industrial mineral oils such as lubricants used in machinery processing and oil residues from chemical production. The oils used in canteens are animal and plant oils, and as long as the amount used is not excessive, they are easy to handle. At the levels used in canteens, biochemical treatment can be applied; it’s possible that the wastewater may contain slightly higher levels of oil due to large amounts used or process-related factors, but this will at least not have an impact on microorganisms, so it’s safe to discharge the water. It is recommended that you treat the wastewater by oil separation before proceeding with biological treatment.
Oil is harmful to microorganisms, but this mainly applies to inorganic oils. Plant and animal oils used in daily life can be managed as long as their amount is not too high; an increased amount can have an impact on microorganisms. Generally, the oil content in water should be below 1 mg/l, as higher levels can affect the efficiency of treatment. Given the 40mg/l threshold mentioned by the poster, it would be best to install an additional secondary oil removal system, which would make a significant difference – the oil content is simply too high.
Those oils can be removed by physical methods. Our company has a type of filter bag known as an oil-absorbing filter bag; it has a filtration precision of 2.5 microns, with an efficiency of 99.9%. However, the flow rate of the liquid must be very slow, otherwise the oil won’t be absorbed thoroughly
Another oil separator can be added; it probably doesn’t need to be very large
The ones upstairs offer oil separation design – are there any specific indicators for the degree of treatment? It seems that one company thinks the effectiveness of such a approach isn’t very good.:L