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| Spectral characteristics of dissolved organic matter released from tomato waste hydrochar |
| Received:January 27, 2022 |
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| KeyWord:vegetable waste;hydrochar;dissolved organic matter（DOM）;spectral characteristics;parallel factor analysis（PARAFAC） |
| Author Name | Affiliation | E-mail | | LI Lingyao | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, China
Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | GUO Xuan | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | LI Yufei | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | LI Jijin | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | SUN Qinping | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | WANG Ping | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, China | wp1826@126.com | | LANG Qianqian | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | lqq20160920@163.com |
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| Abstract: |
| This study examined the release behavior and chemical properties of highly reactive dissolved organic matter(DOM)in hydrochar under different conditions. To do so, three-dimensional fluorescence spectroscopy with parallel factor analysis(PARAFAC)and UV-Vis spectroscopy were employed to analyze the effects of hydrothermal carbonization(HTC)temperatures(180, 200℃ and 220℃) and extraction conditions(deionized water, salt solution, acidic solution, and alkaline solution)on the release kinetics and spectral characteristics of DOM in tomato waste hydrochar(H-180, H-200, and H-220). The results show that H-220 released the highest levels of DOM content(52.1~70.5 mg·g-1), and each hydrochar released the maximum amount of DOM in alkaline solutions(66.6~77.0 mg·g-1). The release kinetics of DOM from the hydrochars followed a second-order model(R2>0.95), and the hydrochars released a large amount of DOM(65.7%~85.8%)in a short time(0.25 h). Three fluorescent components were identified in the hydrochar DOM by PARAFAC:two humic-like components(C1 and C2)and a mixed component(C3)of protein-like and soluble microbial by-product-like substances. The fluorescence intensity of hydrochar DOM gradually increased with increasing HTC temperature. The HTC temperature and extraction conditions both influenced the relative distribution of the three fluorescent components in the hydrochar DOM, and C1 had the highest relative fractional distribution(40.4%~53.6%)of all the hydrochar DOMs. Elevated HTC temperatures(180~220℃)increased the humification degree(6.1%~42.5%)and decreased the bioavailability(5.5%~22.2%)of the hydrochar DOM. Moreover, alkaline conditions promoted the release of substances with high aromaticity and hydrophobicity in the hydrochar DOM. Principal component analysis showed that the HTC temperature and extraction conditions(especially alkaline conditions) both exerted significant effects on the spectral characteristics of the hydrochar DOM. |
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