I’m seeking advice regarding some issues that have arisen at the factory recently
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Oxidation ditch process 1: Continuous low-concentration influent, with COD50 below a certain level; if it is higher, it’s around 50-70. MLSS is 4100, and SV is 18. Microscopic examination shows poor sludge activity. Should we consider reducing the sludge concentration? I’m very worried! 2: The total P level in the effluent is high; it meets Class A standards, but it’s easy to exceed these limits. I know that a low concentration of total P in the inlet water can still result in high levels in the effluent. Are there any good solutions? We’ve produced enough mud. 3: Regarding the optimization of the operation of wastewater treatment plants with low-concentration inflow, does anyone have any relevant information? I need to work on this project; to be honest, my experience with low-concentration inflows is only about 1 month, so I’m seeking advice!
From the SVI perspective, the sludge is lacking in nutrients, is severely aged, and has an excessive proportion of inorganic substances； Sludge drift and filamentous growth can easily occur at this time, so caution is necessary during operation. Suggestions: 1. Supplement the carbon source to ensure biochemical nutrients for optimal phosphorus removal ； 2. Sludge discharge reduces sludge concentration, increases SVI, enhances F/M, and delays sludge aging ； 3. Reduce DO; the effluent level should be at 0. Around 5 is sufficient; intermittent aeration can also be used ； 4. Use phosphorus removal agents to control the phosphorus content in the effluent and ensure it meets the standards ； 5. Increase the return flow rate to the secondary sedimentation tank to reduce the residence time.