Add time:08/15/2019         Source:sciencedirect.com

This study investigated nutrient removal kinetics and main influencing factors of natural PYRRHOTITE (cas 12305-96-3) autotrophic denitrification (PAD), and nutrient removal performance and the microbial community in the PAD biofilter (PADB). Results demonstrated that both NO3− and PO43− in wastewater were nearly completely removed, and biological N removal and chemical P removal took place simultaneously in the PAD process. NO3− removal kinetics of the PAD can be described with half-order kinetics. The PAD was effective across a wide temperature range of 11–34 °C, initial NO3−-N range of 13–52 mg·L−1 and PO43−-P below 60 mg·L−1. Both NO3− and PO43− decreased gradually with wastewater flowing along the PADB. The PADB operation results show that at 12 h HRT, when the PADB treated wastewater containing 30.95 ± 0.97 mg·L−1 of NO3− and 3.02 ± 0.10 mg·L−1 of PO43−-P, the effluent contained 1.15 ± 2.08 and 0.09 ± 0.11 mg·L−1 of NO3−-N and PO43−-P on average, respectively. In the PADB the dominant bacteria were Thiobacillus and Sulfurimonas, which used pyrrhotite as the electron donor to reduce NO3−. The relative abundance of Thiobacillus at the bottom of the PADB increased from 0.81% to 58.65% and that of Sulfurimonas decreased from 97.22% to 12.30%, with exposure to pyrrhotite. From the bottom to the top of the PADB, the relative abundance of Thiobacillus increased from 58.65% to 86.23% and Sulfurimonas decreased from 12.30% to 0.52%. Technologies based on the PAD are promising ways to control eutrophication.

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