Potential of duckweed in the conversion of wastewater nutrients to valuable biomass: a pilot-scale comparison with water hyacinth.
The application potential of duckweed (Lemna japonica 0234) and water hyacinth (Eichhornia crassipes) were compared in two pilot-scale wastewater treatment systems for more than one year. The results indicated duckweed had the same total nitrogen (TN) recovery rate as water hyacinth (0.4 g/m(2)/d) and a slightly lower total phosphorus (TP) recovery rate (approximately 0.1g/m(2)/d) even though its biomass production was half that of water hyacinth. The higher content of crude protein (33.34%), amino acids (25.80%), starch (40.19%), phosphorus (1.24%), flavonoids (2.91%) and lower fiber content provided duckweed with more advantages in resource utilization. Additionally, microbial community discovered by 454 pyrosequencing indicated that less nitrifying bacteria and more nitrogen-fixing bacteria in rhizosphere of duckweed provided it with higher nitrogen recovery efficiency (60%) than water hyacinth (47%). Under the presented condition, duckweed has more application advantages than water hyacinth because it more effectively converted the wastewater nutrients into valuable biomass.
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences (CAS), Chengdu 610041, China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu 610041, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: zhyg6818@163.com.
Yonggui
Y
Zhao
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences (CAS), Chengdu 610041, China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu 610041, China. Electronic address: fangyang@cib.ac.cn.
Yang
Y
Fang
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences (CAS), Chengdu 610041, China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu 610041, China. Electronic address: jinyl@cib.ac.cn.
Yanling
Y
Jin
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences (CAS), Chengdu 610041, China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu 610041, China. Electronic address: huangjun@cib.ac.cn.
Jun
J
Huang
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences (CAS), Chengdu 610041, China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu 610041, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: bigbs@sina.com.
Shu
S
Bao
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences (CAS), Chengdu 610041, China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu 610041, China. Electronic address: futian@cib.ac.cn.
Tian
T
Fu
Yunnan Light Industrial Academy of Science, Kunming 650034, China. Electronic address: hzm1120@163.com.
Zhiming
Z
He
Chengdu Gusheng Technology Development Co. Ltd., Chengdu 610041, China. Electronic address: Wangfeng14668@126.com.
Feng
F
Wang
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences (CAS), Chengdu 610041, China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu 610041, China. Electronic address: zhaohai@cib.ac.cn.
Hai
H
Zhao
D018533:Biomass; D031806:Eichhornia / Q000254:growth & development / Q000378:metabolism*; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism; D010758:Phosphorus / Q000302:isolation & purification / Q000378:metabolism; D010865:Pilot Projects; D062065:Wastewater
D009584:Nitrogen; D010758:Phosphorus; D062065:Wastewater
Duckweed; Rhizosphere microbial community; Valuable biomass; Wastewater nutrients; Water hyacinth