The major risk is the Anoxic ...
Published by Muthu Bharathi, Environment Manager at Aarti Industries Ltd
The major risk is the Anoxic tank becoming part anaerobic due to insufficient nitrates at higher HRT & affecting the overall denitration process. You will also need to increase the recycle ratio from aerobic to anoxic to cope with this.
Other obvious things are the growth of filamentous bacteria, SRBs which ultimately affect your settling properties and also the risk of denitration happening in secondary clarifiers are some things that will affect your settling properties & effluent discharge standards.