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Biodegradation of 2-methylisoborneol by bacteria enriched from biological activated carbon

Rongfang YUAN, Beihai ZHOU, Chunhong SHI, Liying YU, Chunlei ZHANG, Junnong GU

《环境科学与工程前沿（英文）》 2012年第6卷第5期页码 701-710 doi: 10.1007/s11783-011-0367-6

摘要： One of the most common taste and odour compounds (TOCs) in drinking water is 2-methylisoborneol (2-MIB) which cannot be readily removed by conventional water treatments. Four bacterial strains for degrading 2-MIB were isolated from the surface of a biological activated carbon filter, and were characterized as spp., spp., spp. and spp. based on 16S rRNA analysis. The removal efficiencies of 2-MIB with initial concentrations of 515 ng·L were 98.4%, 96.3%, 95.0%, and 92.8% for spp., spp., spp. and spp., respectively. These removal efficiencies were slightly higher than those with initial concentration at 4.2 mg·L (86.1%, 84.4%, 86.7% and 86.0%, respectively). The kinetic model showed that biodegradation of 2-MIB at an initial dose of 4.2 mg·L was a pseudo-first-order reaction, with rate constants of 0.287, 0.277, 0.281, and 0.294 d , respectively. These degraders decomposed 2-MIB to form 2-methylenebornane and 2-methyl-2-bornane as the products.

关键词： 2-methylisoborneol (2-MIB) biodegradation 2-methylenebornane 2-methyl-2-bornane pseudo-first-order reaction

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Detection of geosmin and 2-methylisoborneol by liquid-liquid extraction-gas chromatograph mass spectrum

MA Xiaoyan, CHEN Beibei, LI Qingsong, ZHANG Qiaoli, GU Guofen

《环境科学与工程前沿（英文）》 2007年第1卷第3期页码 286-291 doi: 10.1007/s11783-007-0048-7

摘要： Two sample preparation methods were introduced and compared in this paper to establish a simple, quick and exact analysis of geosmin and 2-methylisoborneol. LC-18 column was employed in solid phase extraction (SPE), 1.0 mL of hexane was adopted in liquid-liquid extraction (LLE), and the extracts were analyzed by gas chromatograph mass spectrum (GCMS) in selected ion mode. Mean recoveries of SPE were low for 2-methylisoborneol (2-MIB) and geosmin (GSM) with values below 50%. For LLE, the recoveries were satisfyingly above 50% for 2-MIB and 80% for GSM. Detection limits of the LLE method were as low as 1.0 ng/L for GSM and 5.0 ng/L for 2-MIB. A year-long investigation on odor chemicals of drinking water in Shanghai demonstrated that in the summer, there was a serious odor problem induced by a high concentration of 2-MIB. The highest concentration of 152.82 ng/L appeared in July in raw water, while GSM flocculation was minimal with concentrations below odor threshold.

关键词： summer flocculation simple Shanghai spectrum

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Occurrence of odor problems in drinking water of major cities across China

SUN Daolin,YU Jianwei,YANG Min,AN Wei,ZHAO Yunyun,LU Ning,YUAN Shengguang,ZHANG Dongqing

《环境科学与工程前沿（英文）》 2014年第8卷第3期页码 411-416 doi: 10.1007/s11783-013-0577-1

摘要： A comprehensive investigation into the occurrence of odor problem at 111 drinking water treatment plants (DWTPs) in major cities across China was undertaken using both flavor profile analysis (FPA) and gas chromatography–mass spectrometry (GC-MS). Eighty percent of source water samples exhibited odor problems, characterized by earthy/musty (41%) and swampy/septic (36%) odors, while the occurrence rate was lower (45%) in the finished water. Source water from rivers exhibited more pollution-origin odors, such as the swampy/septic odor, while that from lakes and reservoirs exhibited more algae-origin odors, such as earthy/musty odors. The occurrence rate of 2-methylisoborneol (2-MIB) in the surface source water samples was 75%, with 7% of samples containing 2-MIB concentrations of over 10 ng·L . The earthy/musty odor in the lake/reservoir water samples was mainly caused by 2-MIB (linear regression coefficient, =0.69), while the correlation between 2-MIB concentration and the earthy/musty odor intensity in the river-source water samples was weak ( =0.35). These results will be useful for the management of odor-quality problems in drinking water of China.

关键词： flavor profile analysis 2-methylisoborneol swampy/septic odor earthy/musty odor drinking water quality

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第三届环境、工业和能源工程国际会议(EI2E 2019)

会议日期： 2019年09月19日

会议地点：宁夏银川

主办单位： APISE

第四届设计、机械和材料工程国际会议(D2ME 2019)

会议日期： 2019年09月26日

会议地点：釜山，韩国

主办单位： HKSME

肖永红：临床高耐药与高毒性病原体共进化（2023年2月22日）

2023年03月10日

关键词：代谢与免疫

第四届设计、机械和材料工程国际会议(D2ME 2019)

会议日期： 2019年09月26日

会议地点：釜山，韩国

主办单位： HKSME

赵家军：2型糖尿病患者的身体活动、久坐行为与心血管疾病风险的关系：MlDiab研究（2023年2月21日）

2023年03月02日

关键词：营养健康

沈世钊：大跨结构（2018年6月2日）

2021年04月22日

关键词：光学技术

Jian Li：iScience and Interdisciplinary Research（2020年4月2日）

2022年04月18日

关键词：工程管理

金涌：化学反应规模的扩大（2018年6月2日）

2021年04月22日

关键词：化工

徐銤院士解读中国核能（2018年6月2日）

2021年04月22日

关键词：核能

孙金生：中国油气开采（2018年6月2日）

2021年04月15日

关键词：采油工程

第2届智能医疗与图像处理国际会议(IMIP 2020)

会议日期： 2020年04月23日

会议地点：天津

主办单位： IMIP 2020

Improvement in the synthesis of 2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(Z)-methoxyiminoacetic acid 2-benzothiazolyl

GAO Shihao, SUN Chenghui, ZHAO Xinqi, GAO Changquan

《化学科学与工程前沿（英文）》 2008年第2卷第1期页码 80-84 doi: 10.1007/s11705-008-0017-0

摘要： 2-(5-Amino-1,2,4-thiadiazol-3-yl)-2-(Z)-methoxyiminoacetic acid 2-benzothiazolyl thioester(III), an important intermediate of the fourth generation cephalosporins, was efficiently synthesized by reacting 2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(Z)-methoxyiminoacetic acid (I) with 2,2′-dibenzothiazole disulfide (II) in the presence of triphenylphosphine. Effects of reaction time, temperature, solvents, catalysts and feeding molar ratio on the yield and quality of products were investigated, and an improved procedure suitable for industrial production was established. Using 1,2-dichloroethane as solvent, triphenylphosphine as reducer, and triethylamine as catalyst, (I) : (II) : (triphenylphosphine) = 1.0 : 1.0 : 1.0, the product was obtained at room temperature in 98.1% yield. The purity of the product without further purification is 98.7% determined by HPLC method. This procedure could be a suitable alternative to the traditional processes because of its easy handling, high yield and low cost.

关键词： 5-Amino-1 2 4-thiadiazol-3-yl 1 2-dichloroethane important intermediate 2-benzothiazolyl thioester temperature