Abstract
Few studies have investigated the process of microbial recovery in wastewater inhibited by high-strength ammonium but focused on the inhibition effects only. In this study, one contrast way and four efficient ways were developed and applied to five parallel sequencing batch biofilm reactors (SBBRs). The effluent ammonia nitrogen (NH4+-N), nitrite nitrogen (NO2−-N), nitrate nitrogen (NO3−-N), total nitrogen (TN), chemical oxygen demand (COD) and total phosphorus (TP) concentrations were investigated to assess the recovery effects of removal rates as well as the recovery mechanism. Results showed that all of these methods have a positive effect, among which introducing algae was optimum for the fast removal recovery of TN and TP within 4 days. And its recovery time is at least 8 days shorter than that in natural recovery. The recovery ways proposed in this study can be potentially applied in the emergency treatment in SBBR system.
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