Activated sludge of my Lab MBR scale setup start turned to blackish as the MLSS go above 10g/L, is there a problem of aeration or something other?
My guess is that the MLSS black colour is caused by Ferrous Sulphide resulting from septicity from inefficient mixing or low dissolved oxygen. Measure dissolved oxygen concentration and if necessary increase to 1.5 mg/L
As rightly said by Michel, High concentration of MLSS and with sufficient food presence, you have to check for DO concentration which need to be maintained >1.5 mg/l in all over the reactor for effective aerobic treatment. Insufficient DO might cause increase in anaerobicity in reactor showing blackish color.
I think MLSS concentration of your reactor is too high. So, oxygen level may be not adequate for treatment.
I believe the organic loading rate may be responsible for this increase in the concentration of MLSS. Check the organic loading rate and sludge age. The sludge age is an important parameter that must be constantly monitored.
At such high MLSS (>10000 mg/l), it requires more attention to uniformly mainitain DO (> 2mg/l) as anaerobic pockets may occurs due to improper mixings. If you keep a check on Mixing, Aeration and OLR, your sludge will not turn black.
thanx all of ,, you i decrease the SRT and increase the D.O level and problem is resolved,,, you all gave right solutions
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