BIOPROCESS AND BIOSYSTEMS ENGINEERING
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2016
·Vol. 39
·期 12
·1867-1875
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IF 1.901
Chen Ben,Tian Xiaofei,Yu Lian,Wu Zhenqiang
Pigments in molasses wastewater (MWW) effluent, such as melanoidins, were considered as kinds of the most recalcitrant and hazardous colorant contaminants to the environment. In this study, de-coloring the MWW by a synergistic combination of micro-electrolysis with bio-treatment was performed. Aiming to a high de-colorization yield, levels of nutrition source supplies, MWW dilution ratio, and micro-electrolysis reaction time were optimized accordingly. For a diluted (50 %, v/v) MWW, an maximum overall de-colorization yield (97.1 ± 0.5 %, for absorbance at 475 nm) was achieved through the bio-electrolysis treatment. In electrolysis bio-treatment, the positive effect of micro-electrolysis was also revealed by a promoted growth of fungal biomass as well as activities of ligninolytic enzymes. Activities of lignin peroxidase, manganese peroxidase, and laccase were promoted by 111.2, 103.9, and 7.7 %, respectively. This study also implied that the bio-treatment and the micro-electrolysis had different efficiencies on removal of pigments with distinct polarities.
研究领域:
环境科学
·
微生物学
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2018
·Vol. 93
·期 9
·2652-2658
·
IF 2.587
Qianlin Huang,Hairong Zhang,Lian Xiong,Chao Huang,Haijun Guo,Xuefang Chen,Mutan Luo,Lanlan Tian,Xiaoqing Lin,Xinde Chen
BACKGROUND A series of monoacrylate modified adsorption resins from reactive mixtures with different amounts and types of monoacrylate have been synthesized by an oil/water (O/W) suspension polymerization technique and utilized to remove fermentation inhibitors and pigments from rice straw hydrolysate for the first time. The modified resin was characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and N 2 adsorption–desorption isotherms. Batch experiments were carried out to determine the adsorption performance of the modified resin for fermentation inhibitors. Regeneration and reusability experiments were performed to evaluate the economic value. RESULTS The modified resin with 80% glycidyl methacrylate (GMA) feed and epoxy group showed optimal selectivity of fermentation inhibitors from rice straw hydrolysate. The adsorption capacities of acid soluble lignin (ASL), formic acid, acetic acid, levulinic acid, 5-hydroxymethylfurfural (5-HMF) and furfural onto 80% GMA modified resin were enhanced by 45%, 156%, 86%, 79%, 131%, 52%, respectively. Furthermore, the decolorization rate was improved by 12% over unmodified styrene-divinylbenzene (St-DVB) adsorption resin with approximately 5% sugar loss. CONCLUSION This work not only provides a potential adsorbent for the removal of fermentation inhibitors from rice straw hydrolysate, but also provides guidance for choosing and modifying the adsorbent to detoxify lignocellulose hydrolysate. © 2018 Society of Chemical Industry
研究领域:
生物工程
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Yapeng He,Xue Wang,Weimin Huang,Rongling Chen,Haibo Lin,Hongdong Li
The aim of this study is to investigate the electrochemical degradation and decolorization of triphenylmethane dyexylenol orange (XO) on boron-doped diamond (BDD) electrodes. A series of parameters, including electrode materials , current density, initial dye concentration and electrolyte composition , are examined to discuss the effect of these factors in terms of chemical oxygen demand (COD) removal, current efficiency and decolorization rate. Complete decolorization and mineralization of XO could be realized on BDD electrodes while the oxidation is mass transfer controlled, and the degradation progress performs better performance in case of porous BDD electrode comparing with flat BDD electrode. The enhancement of effectiveness is highly correlated to the structure of electrode material, where porous BDD film provides more active sites for hydroxyl radicals . The presence of Cl − in the solution promotes the COD and color removal due to the formation of active chlorine. Porous Ti/BDD electrode presents the excellent potential in electrochemical decolorization and mineralization of triphenylmethane dye.
研究领域:
环境科学
·
电化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yu Bai,Lu Zhou,Keke Ma,Hongjie Zhou,Yiying Xin
This study was conducted to access the catalytic performances and reaction mechanisms of Graphene Electroactive Membrane (GEM). The GEM was prepared by vacuum-pressing method, and characterized by FESEM and FTIR. Catalytic performances were measured in the index of decolorization ratio and mineralization rate. Active species were recognized by scavengers for investigating reaction mechanisms. The impacts of current intensity and water flux on catalytic performances were presented to illustrate the mechanisms of GEM electro-catalysis deeply. According to the results, the method of GEM preparation was reliable and Graphene was an appropriate material for Electroactive Membrane (EM). Compared with EM electro-catalysis and GEM with no electro-catalysis (GEM-NEC), the mineralization rate increased by 56.1% and 28.8% respectively, and the decolorization rate increased by 45.5% and 29.8% respectively. The decolorization rate of GEM electro-catalysis with 0.2 M Ammonium Oxalate (Scavenger of electron hole) decreased 32.7% more than GEM electro-catalysis with no scavenger. Thus, direct oxidation was the main mechanism of GEM electro-catalysis, which was very different from traditional electro-catalysis. When current intensity was less than 20 mA and water flux was higher than 3 mL/min, decolorization ratio increased dramatically. Thus, electro-catalytic process and adsorption-diffusion process played important roles in GEM electro-catalysis process. The GEM electro-catalysis was an effective and stable advanced wastewater treatment for removal of organic pollutants.
研究领域:
环境工程
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化学工程
·
材料科学
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产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Bin Wang,Xue-Fei Cao,Shi-Xin Yu,Zhuo-Hua Sun,Xiao-Jun Shen,Jia-Long Wen,Tong-Qi Yuan
The complex pollutants in wastewater, especially the highly toxic and carcinogenic azo-dyes, seriously endanger the water ecosystem and human health. Using renewable lignin to develop efficient flocculants is of great significance to environmental sustainability. Nevertheless, the preparation process of lignin-based flocculant is not only inefficient and cumbersome, but also brings serious pollution, making their development unsustainable. In this study, a new type of ultra-efficient Mannich-functionalized lignin-based flocculants was prepared by a simple, green strategy. Lignin-based flocculants were synthesized by copolymerizing lignin with acrylamide in a UV-induced aqueous copolymerization system and then modified by Mannich with formaldehyde and diethylenetriamine. Comprehensive considering the influence of molecular weight , charge density and amphiphilicity, herein, two different types of lignin-based flocculant (LBF1 and LBF2) could be precisely tuned by adjusting the dose of formaldehyde and diethylenetriamine. The results showed that the turbidity removal rate of LBF1 for kaolin suspension could be up to 99.31%, and the decolorization rate of Acid Black 1, Direct Red 80 and Reactive Red 2 solutions using LBF2 was more than 99.60%, which outperformed almost all other lignin-based flocculants reported in the previous reports. Moreover, LBF1 and LBF2 showed excellent resistance to the complex external environment, reflecting their outstanding universality.
研究领域:
环境科学
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化学工程
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材料科学
·
水处理
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DOI
高影响因子
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