How to deal with high levels of water and ammonia nitrogen in crude oil tanks?
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Experts, not long ago, the ammonia nitrogen level in the water separated from oil storage tanks was above 140, and the COD level was above 2500. How is this type of wastewater treated in petroleum refining companies? Going directly into the wastewater treatment plant has a significant impact on the treatment process, and it’s difficult to ensure that the output meets the required standards. Is there any effective solution?
Given that it is a petroleum refining enterprise, two treatment methods can be considered: 1. Anaerobic + A/O. Since the COD level of this wastewater is high, it cannot be sent directly to aerobic treatment processes; it can first be treated through anaerobic methods such as hydrolysis-acidification or IC, which generally reduces the COD level to a level acceptable for aerobic treatment. The A/O process can then effectively remove any remaining COD and ammonia nitrogen, ensuring that the wastewater meets discharge standards； 2. Flocculation sedimentation + A/O: Flocculants can remove most of the ammonia nitrogen as well as part of the COD; subsequently, the A/O process is used (if flocculation is effective in removing ammonia nitrogen, an aeration tank alone may suffice) to achieve discharge standards ； The specific details can only be determined by taking water samples for pilot tests. If wastewater is to be sent to a wastewater treatment plant, anaerobic treatment or flocculation sedimentation can be used as pre-treatment; the wastewater after this pre-treatment can then be discharged into the wastewater treatment plant.