دانلود رایگان مقاله راه اندازی سریع روند آنانوکس توسط فاقد نیترات کردن لجن گرانولار

Abstract

This study investigated the rapid start-up of an anaerobic ammonium oxidation (anammox) reactor by inoculating denitrifying granular sludge mixed anammox bacteria. The mechanism of the anammox electron transport chain (AETC) was also studied using nine different inhibitors in batch tests. This is the first study that shortened the start-up anammox reactor time to 28 days. Nitrogen removal rates (NRRs) up to 0.72 kg/(m3 d) on day 28 were achieved. Each studied inhibitor had a different binding site in the AETC. The effect of each inhibitor was determined by comparing the total nitrogen removal efficiency between the presence of an inhibitor and an appropriate control. The results confirmed that each inhibitor had various inhibition degrees that distinctly affected the AETC. Finally, the AETC mechanism was explored in detail. These findings are important for developing fast start-up processes for anammox reactors.

4. Conclusions

In this study, rapid start-up of an anammox reactor can be triggered by inoculating the denitrifying granular sludge mixed with some anammox biomass. This represents the first time that the start-up time of an anammox reactor was shortened to 28 days. The NRRs reached 0.72 kg/(m3·d) on day 28. The supposed mechanism of the AETC was explored. The mechanism further elucidated the anammox process. Finally, according to the mechanism, electron transfer could be accelerated by increasing the key enzymatic activities.