SUSTAINABLE ENERGY-EFFICIENT CONVERSION OF WASTE TEA LEAVES TO REDUCING SUGAR: OPTIMIZATION AND LIFE-CYCLE ENVIRONMENTAL IMPACT ASSESSMENT

IF 1 4区环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES

Journal of Environmental Engineering and Landscape Management Pub Date : 2022-05-31 DOI:10.3846/jeelm.2022.16744

R. Chakraborty, Oindrila Roy

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Abstract

Innovative protocols involving energy-proficient pretreatment of waste tea leaves (WTL) for preparation of cellulose and its subsequent photocatalytic hydrolysis (PH) for production of total reducing sugar (TRS) have been reported. The WTL was subjected to alkali pretreatment (60 °C, 1 h) followed by bleaching (employing peracetic acid, 65 °C, 2 h) in a quartz halogen irradiated batch reactor (QHIBR) for efficient separations of lignin and hemicellulose fractions to produce WTL derived cellulose fiber (WTLDCF; 94.5% cellulose). Consequent PH of WTLDCF in QHIBR using combination of Amberlyst-15 and nano-TiO2 catalysts was optimized (parameters: 40 min, 70 °C, 1:30 WTLDCF to water weight ratio and 5 wt. % catalyst concentration) employing Taguchi design that provided maximum 68.25% TRS yield. The QHIBR demonstrated faster hydrolysis and superior energy-efficiency over conventional reactor owing to quartz halogen irradiation. Life cycle assessment indicated an acceptable global warming potential of 2.215 kg CO2 equivalent; thus, establishing an energy-efficient environmentally sustainable WTL valorization process.

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废茶叶可持续节能转化为还原糖:优化及全生命周期环境影响评价

创新方案涉及废茶叶预处理(WTL)制备纤维素及其随后的光催化水解(PH)生产总还原糖(TRS)。WTL经碱预处理(60℃，1 h)，再经过氧乙酸漂白(65℃，2 h)，在石英卤素辐照间歇式反应器(QHIBR)中有效分离木质素和半纤维素组分，生产WTL衍生纤维素纤维(WTLDCF;94.5%纤维素)。采用田口设计优化了Amberlyst-15和纳米tio2复合催化剂QHIBR中WTLDCF的PH(参数:40 min, 70°C, 1:30 WTLDCF与水的重量比，5 wt. %的催化剂浓度)，TRS收率最高为68.25%。由于石英卤素辐照，QHIBR比传统反应器具有更快的水解速度和更高的能效。生命周期评估表明，可接受的全球变暖潜势为2.215 kg CO2当量;从而建立一个节能、环保、可持续的WTL增值过程。

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来源期刊

Journal of Environmental Engineering and Landscape Management 环境科学-环境科学

CiteScore

1.90

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Environmental Engineering and Landscape Management publishes original research about the environment with emphasis on sustainability.