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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.435 CiteScore™: 0.74

ISSN Druckformat: 2150-3621
ISSN Online: 2150-363X

International Journal of Energy for a Clean Environment

Formerly Known as Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.2018025491
pages 143-155

ECOLOGICAL TREATMENT OF MEA AQUEOUS SOLUTION USING A HYDROPONIC METHOD

Feihong Liang
College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture, Wuhan 430070, PR China
Te Tu
College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture, Wuhan 430070, PR China
Ge Yu
College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture, Wuhan 430070, PR China
Wenchao Wang
College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture, Wuhan 430070, PR China
Qingyao He
College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture, Wuhan 430070, PR China
Shuiping Yan
College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture, Wuhan 430070, PR China
Yi Ran
Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China; Key Laboratory of Technology and Model for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture, Beij ing 100125, PR China

ABSTRAKT

In the CO2 chemical absorption process, a CO2 absorbent may be released into air directly through absorbent volatilization and discharged into water body through absorbent leakage, with both leading to the potential pollutions of the air and water environment. In the present study, a new ecological treatment of monoethanolamine (MEA), a widely used solvent in the chemical absorption process, was proposed using lettuce hydroponics. An aqueous MEA solution was firstly CO2-saturated to reduce its pH value to about 7, and then the CO2-rich MEA solution was mixed with a chemical nutrition solution to act as the hydroponic liquid for lettuce cultivation. The feasibility of ecological treatment of MEA by lettuce hydroponics was investigated in terms of the phytotoxicity of MEA and characteristics of the hydroponic lettuce, followed by screening the optimal MEA concentration. The results showed that the phytotoxicity of MEA increases with MEA concentration. Generally, the phytotoxicity of MEA is relatively low. The MEA concentration causing 50% inhibition rate of root growth (EC50) is about 0.012 mol/L, implying that the maximum MEA concentration suitable for ecological treatment should be less than 0.012 mol/L. In terms of the external quality, agronomic trait and physiological characteristic of hydroponic lettuce cultivated in hydroponic liquids containing MEA, the growth of lettuce is improved at some MEA concentrations when compared to the lettuce cultivated in a chemical nutrition liquid, including more active lettuce life, stronger substance assimilation capacity, higher apparent quality and lettuce yield. In short, ecological treatment of MEA on the basis of the hydroponic method is feasible, and the promising concentration of MEA is 0.001 mol-MEA/L.


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