PERFORMANCE OF NITROGEN REMOVAL AND MICROBIAL INTERACTION IN A TWO-STAGE DYNAMIC MEMBRANE BIOREACTOR

LUO Xiao-nan; YANG Yi-qing; ZHANG Nan; MENG Fan-gang

doi:10.13205/j.hjgc.202107013

Volume 39 Issue 7

Jan. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(7): 108-115

LUO Xiao-nan, YANG Yi-qing, ZHANG Nan, MENG Fan-gang. PERFORMANCE OF NITROGEN REMOVAL AND MICROBIAL INTERACTION IN A TWO-STAGE DYNAMIC MEMBRANE BIOREACTOR[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(7): 108-115. doi: 10.13205/j.hjgc.202107013

Citation:

LUO Xiao-nan, YANG Yi-qing, ZHANG Nan, MENG Fan-gang. PERFORMANCE OF NITROGEN REMOVAL AND MICROBIAL INTERACTION IN A TWO-STAGE DYNAMIC MEMBRANE BIOREACTOR[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(7): 108-115. doi: 10.13205/j.hjgc.202107013

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PERFORMANCE OF NITROGEN REMOVAL AND MICROBIAL INTERACTION IN A TWO-STAGE DYNAMIC MEMBRANE BIOREACTOR

doi: 10.13205/j.hjgc.202107013

LUO Xiao-nan^1,2,3,
YANG Yi-qing⁴,
ZHANG Nan⁴,
MENG Fan-gang^{1,3
,
,}

1. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China;
2. Institute of Environmental & Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China;
3. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510006, China;
4. Grandtop Environmental Service Co., Ltd, Guangzhou 514000, China

Received Date: 2021-01-20
Available Online: 2022-01-18

Abstract

Abstract

Dynamic membrane(DM) requires a low transmembrane pressure, which plays a key role in suspended solid removal and energy saving during wastewater treatment. DM can also protect anaerobic ammonium-oxidizing bacteria(AMX) which is used to increase nitrogen removal efficiency in wastewater with low C/N ratio. DM separated heterotrophs and autotrophs in A/O reactor treating low C/N wastewater into anaerobic tank and aerobic tank, respectively. Ammonium-oxidizing bacteria(AOB) was enriched in suspended sludge, and anaerobic ammonium-oxidizing bacteria(AMX) was enriched in biofilms of the O tank. Removal efficiency of ammonium, total nitrogen, and COD were(91.2±7.5)%,(81.0±8.1)%, and(86.4±7.5)%, respectively, with an influent C/N value of 1.0. COD was mainly removed in the A tank and total nitrogen in the O tank. Gravity-driven dynamic membranes achieved satisfactory suspended solid removal with a concentration of(12.2±4.5) mg/L in the effluent. Functional bacteria were enriched in different parts of the reactor by using dynamic membranes and biofilms. Denitrifiers were mainly present in the anaerobic tank(relative abundance of ca. 30%). The AOB was mainly enrich in suspended sludge in aerobic tank sludge, with relative abundance of ca. 5%, and anammox bacteria were abundant in the biofilm of the O tank.Resultsfrom network analysis showed that positive interactions accounted for more than 70% of all interactions among microbes in each community, which ensured the performance of the reactor. In summary, the combination of PN/A, DM, and A/O process, which improved the synergy of different functional bacteria and ensured nitrogen removal in wastewater with low C/N ratio, was a promising method for wastewater treatment.
- autotrophic nitrogen removal,
- dynamic membranes,
- denitrification,
- community structure,
- microbial interaction

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References(29)

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