Optimization nutrient removal at different volume ratio of anoxic-to-aerobic zone in integrated fixed-film activated sludge (IFAS) system

被引：16

作者：

Xu, Xianglong ^{[1
]}

Liu, Guo-hua ^{[1
]}

Li, Qinyu ^{[1
]}

Wang, Hongchen ^{[1
]}

Sun, Xu ^{[1
]}

Shao, Yuting ^{[1
]}

Zhang, Jingbing ^{[1
]}

Liu, Shuai ^{[1
]}

Luo, Fangzhou ^{[1
]}

Wei, Qi ^{[1
]}

Sun, Wenzhuo ^{[1
]}

Li, Yinghao ^{[1
]}

Qi, Lu ^{[1
]}

机构：

[1] Renmin Univ China, Low Carbon Water Environm Technol Res Ctr, Sch Environm & Nat Resources, Beijing 100872, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2021年 / 795卷

关键词：

Wastewater treatment; IFAS; Anoxic-to-aerobic zone's volume ratios; Denitrifying phosphorus removal; Community structure; DENITRIFYING PHOSPHORUS REMOVAL; HYDRAULIC RETENTION TIME; WASTE-WATER TREATMENT; FULL-SCALE IFAS; MICROBIAL COMMUNITY; OXYGEN-TRANSFER; BIOFILM; PERFORMANCE; NITRIFICATION; OXIDATION;

D O I：

10.1016/j.scitotenv.2021.148824

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study evaluated the influence of different volume ratios of the anoxic-to-aerobic zone (V-ano/V-aer) on the enhancement of nitrogen and phosphorus removal in an integrated fixed-film activated sludge (IFAS) system. As the V-ano/V-aer increased from 1:2 to 2:1, the removal of organic carbon, nitrogen and phosphorus nutrients of the IFAS system was improved. At V-ano/V-aer = 1:1, the removal effect of nitrogen and phosphorus nutrients was optimal, and the average removal rates of COD, NH4+-N, TN, and TP of the system reached 90 +/- 3.2%, 98.2 +/- 1.4%, 88.9 +/- 2.2%, and 89.1 +/- 2.7%, respectively. As the volume of the anoxic zone continued to increase, the denitrifying phosphate-accumulating capacity of the system was enhanced, and the highest ratio of specific anoxic and aerobic phosphorus uptake rate could reach 65.3%. Analysis of themolecular evaluation showed that, the proportion of nitrifying bacteria in the biofilm gradually increased as V-ano increased. Moreover, denitrifying phosphate-accumulating organisms (DNPAOs), ammonia-oxidizing archaea (AOA), and anaerobic ammonium oxidizing (Anammox) bacteriawere all enriched all showed enrichment in the biofilm of fiber carriers, which further strengthened the system's synergistic removal of nitrogen and phosphorus. (C) 2021 Elsevier B.V. All rights reserved.

引用

页数：10

共 55 条

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