What if activated sludge turns black

Causes of activated sludge blackening:

1. Due to insufficient aeration capacity, the sludge is transformed into anaerobic.

2. The load of inlet water has changed greatly, causing load impact on the pollution of aeration tank, which is generally larger load.

3. There may be toxic substances entering.

4. There may be pH changes
Suggested solutions:

1. There is no difference between the water quality detected and the usual water quality. If it becomes larger, it is necessary to increase the water return flow or sludge return flow to dilute the influent concentration; Whether there are toxic substances, acid and base exceed the standard and so on

2. It is suggested to check whether the dissolved oxygen in the aeration tank is reasonable and whether it meets the requirements of the design value; It may be caused by insufficient aeration.