what you should do:
1. do more dewatering until SV 30 reaches 450 ml/li or MLVSS within standard.
2. your aeration MLSS is 50% more than MLVSS, which means that you have 50% inorganic materials in aeration tank.
a. pls check efficient operation of your dewatering machine if there are sludge spillages from the edges of the belt. this contains filter aid.
b. check for presence of filter aid at ET. ask QA to evaluate wwtp for presence of filter aid.
2. pls send me pictures of sludge from AT, SV30.
Regards me to Nopporn, Kaew, Suwas,
eric