Performance of loach to reduce clogging matter in vertical-flow constructed wetlands: Hydraulic evaluation and metabolic processes

被引:3
|
作者
Fu, Xiuzheng [1 ,3 ]
Kong, Fanlong [1 ,2 ]
Duan, Pingping [1 ]
Li, Fanyi [1 ]
Hu, Wenxuan [1 ]
Liu, Xiaomin [1 ]
Yu, Zhengda [1 ,2 ]
Cui, Yuqian [1 ,2 ]
机构
[1] Qingdao Univ, Coll Environm Sci & Engn, Qingdao 266071, Peoples R China
[2] Carbon Neutral & Ecoenvironm Technol Innovat Ctr, Qingdao 266071, Peoples R China
[3] China Agr Univ, Coll Resources & Environm Sci, Key Lab Plant Soil Interact Minist Educ, Beijing, Peoples R China
基金
中国国家自然科学基金;
关键词
Clogging; Misgurnus anguillicaudatus; Extracellular polymeric substances (EPS); Microbial metabolism; Hydraulic characteristic; EXTRACELLULAR POLYMERIC SUBSTANCES; WASTE-WATER; MICROBIAL COMMUNITY; SOLIDS ACCUMULATION; NUTRIENT REMOVAL; CARBON SOURCE; IMPACT; DENITRIFICATION; MACROPHYTE; SUBSTRATE;
D O I
10.1016/j.cej.2024.155280
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Extracellular polymeric substances (EPS) secreted by microorganisms cause constructed wetlands (CWs) clogging, which is a major challenge for the long-term stable operation of CWs. This study provided a comprehensive and in-depth study of the hydraulic evaluation and metabolic processes of loach (Misgurnus anguillicaudatus) in mitigating clogging. The results showed that the loach reduced the clogging content in the substrate layer and improved the hydraulic performance of the system. The loach system increased the initial porosity in the sand layer by 11.52 %, 25.11 %, and 28.15 %, and the initial porosity in the gravel layer by 15.49 %, 15.85 %, and 13.83 %, respectively. Loach also increased the actual and theoretical hydraulic retention time (HRT), improved the connectivity between different layers, and reduced the "dead zone" area of the system. The analysis of EPS components revealed that the daily EPS removal amount of each loach was 36.64 mg L-1, in which S-EPS, LB-EPS, and TB-EPS were 21.80, 8.02, and 6.82 mg L(-1)d(-1), respectively. Direct feeding and the indirect coordination with microorganisms effectively reduced the contents of polysaccharides and proteins in EPS, and increased the proportion of humic acid and nucleic acid. The clogging characteristics analysis also confirmed that loach decreased tyrosine and tryptophan fluorophores groups and reduced the proportion of protein or peptide substances in the macromolecules in EPS. In addition, loach increased the activities of dehydrogenase, fluorescein diacetate, and the relative abundance of Chlorobiaceae in the sand layer, which was conducive to the hydrolysis of clogging matters with the metabolic activity of microorganisms. Loach increased the relative abundance of denitrifying microorganisms such as Aeromonadaceae, Rhodocyclaceae, and Hydrogenophilaceae in the gravel layer, which enhanced the denitrification process of the system and was conducive to pollutant transformation and clogging matter degradation. In conclusion, this study proposes a novel, eco-friendly strategy for preventing CW clogging in wetland animals.
引用
收藏
页数:15
相关论文
共 50 条
  • [31] Hydraulic behaviors of vertical flow constructed wetlands
    Lu, Xiuqing
    Zhan, Dehao
    Tao, Tao
    Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition), 2010, 38 (03): : 104 - 107
  • [32] An integrated model of substrate clogging in vertical flow constructed wetlands
    Hua, G. F.
    Li, L.
    Zhao, Y. Q.
    Zhu, W.
    Shen, J. Q.
    JOURNAL OF ENVIRONMENTAL MANAGEMENT, 2013, 119 : 67 - 75
  • [33] Municipal wastewater treatment and utilization using vertical-flow constructed wetlands
    Cui, LH
    Zhu, XZ
    Luo, SM
    Li, GX
    Bai, Y
    Zhang, ZX
    Chang, FH
    WETLANDS & REMEDIATION: AN INTERNATIONAL CONFERENCE, 2000, : 171 - 177
  • [34] Treatment of septic tank effluent using vertical-flow constructed wetlands
    Cui, L
    Luo, SM
    Zhu, XZ
    Liu, YH
    WETLANDS AND REMEDIATION II, 2002, : 225 - 234
  • [35] Enhanced nitrogen elimination in vertical-flow constructed wetlands in cold climates
    Laber, J
    Haberl, R
    Perfler, R
    CONSTRUCTED WETLANDS FOR WASTEWATER TREATMENT IN COLD CLIMATES, 2003, 11 : 107 - 122
  • [36] Influence of the plant development on microbial diversity of vertical-flow constructed wetlands
    Zhao, Yong-Jun
    Li, Ji-Hua
    Wang, Zheng-Fang
    Yan, Cheng
    Wang, Shou-Bing
    Zhang, Ji-Biao
    BIOCHEMICAL SYSTEMATICS AND ECOLOGY, 2012, 44 : 4 - 12
  • [37] Clogging development and hydraulic performance of the horizontal subsurface flow stormwater constructed wetlands: a laboratory study
    Tang, Ping
    Yu, Bohai
    Zhou, Yongchao
    Zhang, Yiping
    Li, Jin
    ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 2017, 24 (10) : 9210 - 9219
  • [38] Toxic effect of perfluorooctane sulfonate on plants in vertical-flow constructed wetlands
    Rong Li
    Tianhao Tang
    Weichuan Qiao
    Jun Huang
    Journal of Environmental Sciences, 2020, (06) : 176 - 186
  • [39] Vertical-flow constructed wetlands treating domestic wastewater contaminated by hydrocarbons
    Al-Isawi, R. H. K.
    Sani, A.
    Almuktar, S. A. A. A. N.
    Scholz, M.
    WATER SCIENCE AND TECHNOLOGY, 2015, 71 (06) : 938 - 946
  • [40] Toxic effect of perfluorooctane sulfonate on plants in vertical-flow constructed wetlands
    Li, Rong
    Tang, Tianhao
    Qiao, Weichuan
    Huang, Jun
    JOURNAL OF ENVIRONMENTAL SCIENCES, 2020, 92 : 176 - 186