Superacid state of acidogenic phase and control strategy for recovery

In order to investigate the control strategy for the recovery of acidogenic phase reactor from superacid state, both the ways of cutting down the COD organic loading rate (OLR) and adjusting the influent alkalinity were performed respectively in the experiments. When the reactor is in the state of superacid simultaneously, the method of decreasing OLR and adjusting influent alkalinity should be adopted, because it is more efficient than only cutting down the OLR for the rapid recovery of the reactor. The recovery process of superacid state was relatively slow so that during the period of shock loading, the pH value of the reactor should be maintained at a normal range by adjusting influent alkalinity. It is still significant to avoid the occurrence of superacid state.