A treatment plant of textile effluent; with sequence of operation = primary treatment (lime+FeSO4) - Unaerobic treatment - Aerobic treatment - Secondary clarifier - Tertiary treatment.  We have a problem that when we start flow from unaerobic to aerobic treatment, it becomes black instantly. What could be the reason and solution?


Santosh Shiragave
santosh_shiragave@yahoo.co.uk