Restricted accessResearch articleFirst published online 2019-09
Effect of New Combined Inhibitors on the Shift of Full Nitrification to Shortcut Nitrification via Nitrite in a Moving Bed Biofilm Reactor During Oil Shale Retorting Wastewater Treatment
The objective of this study was to characterize nitrogen removal through nitrite when treating oil shale retorting wastewater by dosing methanoic acid and hydrazine as inhibitors in moving bed biofilm reactors. Molecular operating environment (MOE) simulation showed in the presence of methanoic acid, ammonia oxidizing bacteria (AOB), and denitrifying bacteria would gradually increase and become dominant bacteria. However, the effect of hydrazine on shortcut nitrification might only be that the toxicity of hydrazine had a strong inhibitory effect on nitrite oxidizing bacteria. A series of comparative experiments showed the best dosing method of inhibitor was methanoic acid-hydrazine2 and full nitrification–denitrification through nitrate shifted to shortcut nitrification–denitrification through nitrite successfully by dosing the combined inhibitor. When the influent was twofold dilution of the oil shale retorting wastewater, the average removal efficiency of ammonium and total nitrogen were 85.2% and 59.8%, respectively. Throughout the experiment, the nitrite accumulation efficiency remained >90% and was almost unaffected by changes of influent water, so methanoic acid-hydrazine2 was considered to be responsible for the shortcut nitrification–denitrification process in this study. High-throughput analysis of biofilm samples showed the enrichment of AOB in the system, which was the same as the results of MOE simulation. Dosing methanoic acid-hydrazine2 could quickly start shortcut nitrification and methanoic acid-hydrazine2 was the best dosing mode to control and maintain shortcut nitrification. The obtained results could provide further information for oil shale retorting wastewater treatment and provide an alternative process for the treatment of high-strength ammonia wastewater.
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