Is there any way to quickly reduce the COD of the effluent to below 1000?
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This post was last edited by slll611 on 2016-5-1 at 12:00. The initial COD level was around 5000, while it was about 1000 after treatment. Currently, due to the increasing concentration of the raw water, which has reached 8000, the concentration of the treated water has soared to 2500. There are also fewer bacteria in the aerobic tank. I would like to ask if anyone knows any methods that can help reduce the concentration of the treated water to below 1000 quickly?
When there is a malfunction in the aerobic tank, the quality of the effluent deteriorates; parameters such as SS, color, COD, and ammonia nitrogen in the effluent increase at a relatively fast pace, with the degree of deterioration becoming significant within 2–3 days； Generally, it takes a process for things to improve from bad to good; there’s no way to rush this process, and immediate improvement is impossible. It always requires a recovery period of 3 to 5 days. Given this characteristic of biological units, operators, especially those in technical and management roles, need to be meticulous in daily operation and management. They must take timely action in response to any faults or abnormalities that arise. Moreover, there is a delay in analyzing data and identifying changes in faults; therefore, it is not only necessary to resolve problems promptly but also to predict the development trend of certain faults in advance, so as to take measures early on to prevent further progression of those faults. Regarding the question you raised, it is recommended to: 1. Reduce the amount of water introduced, that is, to decrease the overall amount of organic matter entering ； 2. Increase dissolved oxygen to enhance reaction depth ； 3. Reduce the return flow to the secondary sedimentation tank and extend the biological retention time ； 4. Reduce sludge discharge and increase MLSS, thereby lowering the F/M ratio and thus reducing the organic load ； 5. Increase the frequency of analysis and testing to promptly identify trends in changes ； 6. Adjust the nutritional ratio based on the analysis data ； It usually takes 3 to 5 days to recover. I look forward to hearing about your progress later.
Too little information is provided; the original poster needs to explain more in detail.
Thank you all. During this period, 400 kg of powdered activated carbon has been added to the aerobic tank, which has reduced sludge discharge; 10 kg of glucose is added daily. Under microscopic examination, there are more bacteria now than before, but the COD level has not decreased
Furthermore, due to production reasons, a large amount of wastewater is generated, making it impossible to reduce the volume of water fed into the wastewater treatment system