CHARACTERISTICS OF SIMULTANEOUS TREATMENT OF NITROGEN AND PHOSPHORUS IN PYRITE BIOFILTER AND ITS MICROBIAL COMMUNITY

LIU Bin; HE Jie; LI Xueyan

doi:10.13205/j.hjgc.202203006

Volume 40 Issue 3

Mar. 2022

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LIU Bin, HE Jie, LI Xueyan. CHARACTERISTICS OF SIMULTANEOUS TREATMENT OF NITROGEN AND PHOSPHORUS IN PYRITE BIOFILTER AND ITS MICROBIAL COMMUNITY[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(3): 32-37,138. doi: 10.13205/j.hjgc.202203006

Citation:

LIU Bin, HE Jie, LI Xueyan. CHARACTERISTICS OF SIMULTANEOUS TREATMENT OF NITROGEN AND PHOSPHORUS IN PYRITE BIOFILTER AND ITS MICROBIAL COMMUNITY[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(3): 32-37,138. doi: 10.13205/j.hjgc.202203006

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CHARACTERISTICS OF SIMULTANEOUS TREATMENT OF NITROGEN AND PHOSPHORUS IN PYRITE BIOFILTER AND ITS MICROBIAL COMMUNITY

doi: 10.13205/j.hjgc.202203006

LIU Bin¹,
HE Jie²,
LI Xueyan^{1
,
,}

1. School of Environment Science and Engineering, Suzhou University of Science and Technology, Suzhou 215002, China;
2. Yancheng Environmental Monitoring Center of Jiangsu Province, Yancheng 224000, China

Received Date: 2021-06-19
Available Online: 2022-07-07

Abstract

Abstract

As the effluent discharge index of sewage treatment plant tends to be more strict, deep denitrification and dephosphorization of tail water gradually becomes an indispensable process. In this study, pyrite was used as the main filler of biofilter to conduct simultaneous denitrification and dephosphorization treatment of wastewater with low concentration of NO₃^--N and PO₄^3--P, and to investigate the pollutant conversion characteristics and functional microbial changes during the start-up process. The results showed that the simultaneous denitrification and dephosphorization of the biofilter could be realized after 30-day operation, and its maximum total nitrogen removal rate reached 70 g/(m³·d). HRT could be controlled within 6 h to avoid mass production of NO₂^--N. HRT had little effect on gradual removal of phosphorus from the biofilter and the effluent total phosphorus concentration reduced to 0.2~0.4 mg/L. SEM-EDX and phosphorus morphology analysis showed that phosphorus was mainly removed in the form of iron and phosphorus compounds. Analysis of functional microbial community showed that Thiobacillus (27.6%), Sulfurimonas (11.8%), Thiohalobacter (10.9%) were the main functional microorganisms in the process of autotrophic denitrification. This system was a promising way to remove NO₃^--N and PO₄^3--P simultaneously from wastewater lack of organic carbon sources.
- biofilter,
- pyrite,
- sulfur autotrophic denitrification,
- phosphorus removal,
- microbial community

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References(19)

References

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