51
|
Du X, Li Y, Zhou W, Zhou Q, Liu H, Xu Y. Phenazine-1-carboxylic acid production in a chromosomally non-scar triple-deleted mutant Pseudomonas aeruginosa using statistical experimental designs to optimize yield. Appl Microbiol Biotechnol 2013; 97:7767-78. [DOI: 10.1007/s00253-013-4921-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Revised: 04/06/2013] [Accepted: 04/10/2013] [Indexed: 10/26/2022]
|
52
|
Zokaei-Kadijani S, Safdari J, Mousavian M, Rashidi A. Study of oxygen mass transfer coefficient and oxygen uptake rate in a stirred tank reactor for uranium ore bioleaching. ANN NUCL ENERGY 2013. [DOI: 10.1016/j.anucene.2012.07.036] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
53
|
Guo WQ, Yang SS, Pang JW, Ding J, Zhou XJ, Feng XC, Zheng HS, Ren NQ. Application of low frequency ultrasound to stimulate the bio-activity of activated sludge for use as an inoculum in enhanced hydrogen production. RSC Adv 2013. [DOI: 10.1039/c3ra41723a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
54
|
Kong Q, Zhai C, Guan B, Li C, Shan S, Yu J. Mathematic modeling for optimum conditions on aflatoxin B₁degradation by the aerobic bacterium Rhodococcus erythropolis. Toxins (Basel) 2012. [PMID: 23202311 PMCID: PMC3509703 DOI: 10.3390/toxins4111181] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Response surface methodology was employed to optimize the degradation conditions of AFB₁ by Rhodococcus erythropolis in liquid culture. The most important factors that influence the degradation, as identified by a two-level Plackett-Burman design with six variables, were temperature, pH, liquid volume, inoculum size, agitation speed and incubation time. Central composite design (CCD) and response surface analysis were used to further investigate the interactions between these variables and to optimize the degradation efficiency of R. erythropolis based on a second-order model. The results demonstrated that the optimal parameters were: temperature, 23.2 °C; pH, 7.17; liquid volume, 24.6 mL in 100-mL flask; inoculum size, 10%; agitation speed, 180 rpm; and incubation time, 81.9 h. Under these conditions, the degradation efficiency of R. erythropolis could reach 95.8% in liquid culture, which was increased by about three times as compared to non-optimized conditions. The result by mathematic modeling has great potential for aflatoxin removal in industrial fermentation such as in food processing and ethanol production.
Collapse
Affiliation(s)
- Qing Kong
- School of Food Science and Engineering, Ocean University of China, Qingdao, Shandong 266003, China; (C.Z.); (B.G.)
- Author to whom correspondence should be addressed; ; Tel.: +86-532-8203-1851; Fax: +86-532-8203-2389
| | - Cuiping Zhai
- School of Food Science and Engineering, Ocean University of China, Qingdao, Shandong 266003, China; (C.Z.); (B.G.)
| | - Bin Guan
- School of Food Science and Engineering, Ocean University of China, Qingdao, Shandong 266003, China; (C.Z.); (B.G.)
| | - Chunjuan Li
- Shandong Peanut Research Institute, Qingdao, Shandong 266100, China; (C.L.); (S.S.)
| | - Shihua Shan
- Shandong Peanut Research Institute, Qingdao, Shandong 266100, China; (C.L.); (S.S.)
| | - Jiujiang Yu
- US Department of Agriculture (USDA), Agricultural Research Service (ARS), Southern Regional Research Center, New Orleans, LA 70124, USA;
| |
Collapse
|
55
|
Yang SS, Guo WQ, Cao GL, Zheng HS, Ren NQ. Simultaneous waste activated sludge disintegration and biological hydrogen production using an ozone/ultrasound pretreatment. BIORESOURCE TECHNOLOGY 2012; 124:347-354. [PMID: 22995165 DOI: 10.1016/j.biortech.2012.08.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 07/31/2012] [Accepted: 08/02/2012] [Indexed: 06/01/2023]
Abstract
This paper offers an effective pretreatment method that can simultaneously achieve excess sludge reduction and bio-hydrogen production from sludge self-fermentation. Batch tests demonstrated that the combinative use of ozone/ultrasound pretreatment had an advantage over the individual ozone and ultrasound pretreatments. The optimal condition (ozone dose of 0.158 g O(3)/g DS and ultrasound energy density of 1.423 W/mL) was recommended by response surface methodology. The maximum hydrogen yield was achieved at 9.28 mL H(2)/g DS under the optimal condition. According to the kinetic analysis, the highest hydrogen production rate (1.84 mL/h) was also obtained using combined pretreatment, which well fitted the predicted equation (the squared regression statistic was 0.9969). The disintegration degrees (DD) were limited to 19.57% and 46.10% in individual ozone and ultrasound pretreatments, while it reached up to 60.88% in combined pretreatment. The combined ozone/ultrasound pretreatment provides an ideal and environmental friendly solution to the problem of sludge disposal.
Collapse
Affiliation(s)
- Shan-Shan Yang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | | | | | | | | |
Collapse
|
56
|
Rittmann S, Herwig C. A comprehensive and quantitative review of dark fermentative biohydrogen production. Microb Cell Fact 2012; 11:115. [PMID: 22925149 PMCID: PMC3443015 DOI: 10.1186/1475-2859-11-115] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Accepted: 08/03/2012] [Indexed: 01/25/2023] Open
Abstract
Biohydrogen production (BHP) can be achieved by direct or indirect biophotolysis, photo-fermentation and dark fermentation, whereof only the latter does not require the input of light energy. Our motivation to compile this review was to quantify and comprehensively report strains and process performance of dark fermentative BHP. This review summarizes the work done on pure and defined co-culture dark fermentative BHP since the year 1901. Qualitative growth characteristics and quantitative normalized results of H2 production for more than 2000 conditions are presented in a normalized and therefore comparable format to the scientific community.Statistically based evidence shows that thermophilic strains comprise high substrate conversion efficiency, but mesophilic strains achieve high volumetric productivity. Moreover, microbes of Thermoanaerobacterales (Family III) have to be preferred when aiming to achieve high substrate conversion efficiency in comparison to the families Clostridiaceae and Enterobacteriaceae. The limited number of results available on dark fermentative BHP from fed-batch cultivations indicates the yet underestimated potential of this bioprocessing application. A Design of Experiments strategy should be preferred for efficient bioprocess development and optimization of BHP aiming at improving medium, cultivation conditions and revealing inhibitory effects. This will enable comparing and optimizing strains and processes independent of initial conditions and scale.
Collapse
Affiliation(s)
- Simon Rittmann
- Institute of Chemical Engineering, Research Area Biochemical Engineering, Gumpendorferstraße 1a, Vienna University of Technology, Vienna, 1060, Austria
| | - Christoph Herwig
- Institute of Chemical Engineering, Research Area Biochemical Engineering, Gumpendorferstraße 1a, Vienna University of Technology, Vienna, 1060, Austria
| |
Collapse
|
57
|
Optimization of mixotrophic medium components for biomass production and biochemical composition biosynthesis by Chlorella vulgaris using response surface methodology. J Taiwan Inst Chem Eng 2012. [DOI: 10.1016/j.jtice.2011.11.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
58
|
Formation of aerobic granules by Mg2+ and Al3+ augmentation in sequencing batch airlift reactor at low temperature. Bioprocess Biosyst Eng 2012; 35:1049-55. [DOI: 10.1007/s00449-012-0702-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2011] [Accepted: 11/26/2011] [Indexed: 10/28/2022]
|
59
|
Optimization of production conditions for mushroom polysaccharides with high yield and antitumor activity. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2011.11.042] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
60
|
Pressurized liquid extraction of Orthosiphon stamineus oil: Experimental and modeling studies. J Supercrit Fluids 2012. [DOI: 10.1016/j.supflu.2011.12.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
61
|
Zhou XJ, Guo WQ, Yang SS, Ren NQ. A rapid and low energy consumption method to decolorize the high concentration triphenylmethane dye wastewater: operational parameters optimization for the ultrasonic-assisted ozone oxidation process. BIORESOURCE TECHNOLOGY 2012; 105:40-47. [PMID: 22189075 DOI: 10.1016/j.biortech.2011.11.089] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2011] [Revised: 11/13/2011] [Accepted: 11/24/2011] [Indexed: 05/31/2023]
Abstract
This research set up an ultrasonic-assisted ozone oxidation process (UAOOP) to decolorize the triphenylmethane dyes wastewater. Five factors - temperature, initial pH, reaction time, ultrasonic power (low frequency 20 kHz), and ozone concentration - were investigated. Response surface methodology was used to find out the major factors influencing color removal rate and the interactions between these factors, and optimized the operating parameters as well. Under the experimental conditions: reaction temperature 39.81 °C, initial pH 5.29, ultrasonic power 60 W and ozone concentration 0.17 g/L, the highest color removals were achieved with 10 min reaction time and the initial concentration of the MG solution was 1000 mg/L. The optimal results indicated that the UAOOP was a rapid, efficient and low energy consumption technique to decolorize the high concentration MG wastewater. The predicted model was approximately in accordance with the experimental cases with correlation coefficients R(2) and R(adj)(2) of 0.9103 and 0.8386.
Collapse
Affiliation(s)
- Xian-Jiao Zhou
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | | | | | | |
Collapse
|
62
|
Yang SS, Guo WQ, Zhou XJ, Meng ZH, Liu B, Ren NQ. Optimization of operating parameters for sludge process reduction under alternating aerobic/oxygen-limited conditions by response surface methodology. BIORESOURCE TECHNOLOGY 2011; 102:9843-51. [PMID: 21906935 DOI: 10.1016/j.biortech.2011.07.079] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2011] [Revised: 07/16/2011] [Accepted: 07/21/2011] [Indexed: 05/17/2023]
Abstract
Batch tests were employed to estimate the optimal conditions for excess sludge reduction under an alternating aerobic/oxygen-limited environment using response surface methodology. Three key operating parameters, initial mixed liquor suspended solids (initial MLSS), HRT (hydraulic retention time) and reaction temperature (T), were selected, and their interrelationships studied by the Box-Behnken design. The experimental data and ANOVA analysis showed that the coefficient of determination (R(2)) was 0.9956 and the adjR(2) was 0.9912, which demonstrates that the modified model was significant. The optimum conditions were predicted to give a maximal ΔMLSS yield of 226 mg/L at an initial MLSS of 10,021 ± 50 mg/L, an HRT of 9.1h and a reaction temperature of 29°C. The prediction was tested by triplicate experiments, where a ΔMLSS yield of 233 mg/L was achieved under the chosen optimal conditions. This excellent correlation between the predicted and measured values provides confidence in the model.
Collapse
Affiliation(s)
- Shan-Shan Yang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | | | | | | | | | | |
Collapse
|
63
|
Nath K, Das D. Modeling and optimization of fermentative hydrogen production. BIORESOURCE TECHNOLOGY 2011; 102:8569-8581. [PMID: 21531132 DOI: 10.1016/j.biortech.2011.03.108] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Revised: 03/30/2011] [Accepted: 03/31/2011] [Indexed: 05/30/2023]
Abstract
Biohydrogen is a sustainable energy resource due to its potentially higher efficiency of conversion to usable power, non-polluting nature and high energy density. The purpose of modeling and optimization is to improve, analyze and predict biohydrogen production. Biohydrogen production depends on a number of variables, including pH, temperature, substrate concentration and nutrient availability, among others. Mathematical modeling of several distinct processes such as kinetics of microbial growth and products formation, steady state behavior of organic substrate along with its utilization and inhibition have been presented. Present paper summarizes the experimental design methods used to investigate effects of various factors on fermentative hydrogen production, including one-factor-at-a-time design, full factorial and fractional factorial designs. Each design method is briefly outlined, followed by the introduction of its analysis. In addition, the applications of artificial neural network, genetic algorithm, principal component analysis and optimization process using desirability function have also been highlighted.
Collapse
Affiliation(s)
- Kaushik Nath
- Department of Chemical Engineering, GH Patel College of Engineering and Technology, Vallabh Vidya Nagar 388 120, Gujarat, India
| | | |
Collapse
|
64
|
Yong X, Raza W, Yu G, Ran W, Shen Q, Yang X. Optimization of the production of poly-γ-glutamic acid by Bacillus amyloliquefaciens C1 in solid-state fermentation using dairy manure compost and monosodium glutamate production residues as basic substrates. BIORESOURCE TECHNOLOGY 2011; 102:7548-54. [PMID: 21665467 DOI: 10.1016/j.biortech.2011.05.057] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Revised: 05/05/2011] [Accepted: 05/17/2011] [Indexed: 05/08/2023]
Abstract
Poly-γ-glutamic acid (γ-PGA) is a polymer with uses in foods, cosmetics, medicine and agriculture. The medium for the production of γ-PGA by Bacillusamyloliquefaciens C1 was optimized by response surface methodology using agro-industrial wastes in solid-state fermentation (SSF). The optimal SSF medium (20g substrates with 50% initial moisture) for producing γ-PGA was determined to contain 5.51g dairy manure compost, 1.91g soybean cake, 0.57g corn flour, 2.15g monosodium glutamate production residues, 1.5g wheat bran, 0.5g rapeseed cake, 0.1g citric acid, 0.05g MgSO(4)·7H(2)O and 0.03g MnSO(4)·H(2)O. In this medium the strain produced up to 0.0437g γ-PGA per gram of substrates when cultured for 48h at 37°C. SDS-PAGE showed that the molecular weight of the γ-PGA was more than 130kDa. Due to the high-yields observed and the low-cost nature of the optimal medium, this study indicates a possibility to establish economical large-scale production of γ-PGA.
Collapse
Affiliation(s)
- Xiaoyu Yong
- Jiangsu Provincial Key Laboratory for Organic Solid Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China
| | | | | | | | | | | |
Collapse
|
65
|
Wang S, Zhang C, Yan Y. Biodegradation of methyl parathion and p-nitrophenol by a newly isolated Agrobacterium sp. strain Yw12. Biodegradation 2011; 23:107-16. [PMID: 21744158 DOI: 10.1007/s10532-011-9490-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2010] [Accepted: 06/07/2011] [Indexed: 10/18/2022]
Abstract
Strain Yw12, isolated from activated sludge, could completely degrade and utilize methyl parathion as the sole carbon, phosphorus and energy sources for growth in the basic salt media. It could also completely degrade and utilize p-nitrophenol as the sole carbon and energy sources for growth in the minimal salt media. Phenotypic features, physiological and biochemical characteristics, and phylogenetic analysis of 16S rRNA sequence showed that this strain belongs to the genus of Agrobacterium sp. Response surface methodology was used to optimize degradation conditions. Under its optimal degradation conditions, 50 mg l(-1) MP was completely degraded within 2 h by strain Yw12 and the degradation product PNP was also completely degraded within 6 h. Furthermore, strain Yw12 could also degrade phoxim, methamidophos, chlorpyrifos, carbofuran, deltamethrin and atrazine when provided as the sole carbon and energy sources. Enzymatic analysis revealed that the MP degrading enzyme of strain Yw12 is an intracellular enzyme and is expressed constitutively. These results indicated that strain Yw12 might be used as a potential and effective organophosphate pesticides degrader for bioremediation of contaminated sites.
Collapse
Affiliation(s)
- Shenghui Wang
- Graduate School, Chinese Academy of Agricultural Sciences, 12 Zhongguancun Nandajie, Beijing, China
| | | | | |
Collapse
|
66
|
Qianchun D, Pin Z, Qingde H, Fenghong H, Fang W, Mingming Z, Xiao Y, Qi Z, Chang Z. Chemical synthesis of phytosterol esters of polyunsaturated fatty acids with ideal oxidative stability. EUR J LIPID SCI TECH 2011. [DOI: 10.1002/ejlt.201000090] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
67
|
Costa JB, Rossi DM, De Souza EA, Samios D, Bregalda F, do Carmo Ruaro Peralba M, Flores SH, Ayub MAZ. The optimization of biohydrogen production by bacteria using residual glycerol from biodiesel synthesis. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2011; 46:1461-1468. [PMID: 21967246 DOI: 10.1080/10934529.2011.609036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this research the production of hydrogen by Klebsiella pneumoniae BLb01 using residual glycerol discharged from a biodiesel fuel production plant was investigated. Klebsiella pneumoniae BLb01 was isolated from a bacteria-rich sludge of an upflow anaerobic sludge blanket reactor (UASB) of a soybean processing plant. A Plackett-Burman design (P-B) and Response Surface Methodology (RSM) were employed to determine the optimal condition for enhanced hydrogen production. The maximal hydrogen production, which was 45.0 mol % and with 98% of glycerol degradation, was achieved with the optimized medium with the following composition: 30 g L(-1) glycerol; 3 g L(-1) yeast ex tract 3 g L(-1) K(2)HPO(4); 1 g L(-1) KH(2)PO(4); temperature 39°C and pH 9.0. These results show the ability of this new strain of effectively converting residual glycerol into value-added energy products.
Collapse
Affiliation(s)
- Janaina B Costa
- Department of Chemistry, Universidade Federal do Rio Grande do Sul, Brazil
| | | | | | | | | | | | | | | |
Collapse
|
68
|
Raza W, Yang X, Wu H, Huang Q, Xu Y, Shen Q. Evaluation of metal ions (Zn(2+), Fe(3+) and Mg(2+)) effect on the production of fusaricidin-type antifungal compounds by Paenibacillus polymyxa SQR-21. BIORESOURCE TECHNOLOGY 2010; 101:9264-9271. [PMID: 20685115 DOI: 10.1016/j.biortech.2010.07.052] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Revised: 07/13/2010] [Accepted: 07/14/2010] [Indexed: 05/29/2023]
Abstract
Effect of metal ions (Mg(2+), Zn(2+) and Fe(3+)) on the production of fusaricidin-type antifungal compounds by Paenibacillus polymyxa SQR-21 was studied in liquid culture. First, one-factor; three-level experiments were conducted to find out optimal concentrations of each metal ion for maximum production of fusaricidins. Later, three-factor; five-level experiments were performed and a quadratic predictive model was developed using response surface methodology (RSM). The results indicated that Fe(3+) and Mg(2+) positively affected the growth of P. polymyxa as determined by measuring the OD(600) of the liquid culture. The production of fusaricidin-type antifungal compounds was significantly inhibited by Zn(2+) (P=0.0114) and increased by Mg(2+) (P=0.0051) but the effect of Fe(3+) (P=0.2157) was non-significant. However, a synergistic positive effect of Mg(2+) and Fe(3+) on the production of antifungal compounds was observed. This study sheds lights on the pertinent effects of the individual and combined metal ions on the production of fusaricidins in P. polymyxa. It provides the key information for optimization of the metal ions in the fermentation media to achieve the maximum antibiotic production in this strain.
Collapse
Affiliation(s)
- Waseem Raza
- Jiangsu Provincial Key Lab for Organic Slid Waste Utilization, Nanjing Agricultural University, Nanjing 210095, PR China
| | | | | | | | | | | |
Collapse
|
69
|
Biswas R, Sahai V, Mishra S, Bisaria VS. Bioprocess strategies for enhanced production of xylanase by Melanocarpus albomyces IITD3A on agro-residual extract. J Biosci Bioeng 2010; 110:702-8. [DOI: 10.1016/j.jbiosc.2010.07.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Revised: 07/21/2010] [Accepted: 07/23/2010] [Indexed: 10/19/2022]
|
70
|
Isolation of non-starch polysaccharides from bulb of tiger lily (Lilium lancifolium Thunb.) with fermentation of Saccharomyces cerevisiae. Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2010.01.051] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
71
|
Cao GL, Ren NQ, Wang AJ, Guo WQ, Yao J, Feng YJ, Zhao QL. Statistical optimization of culture condition for enhanced hydrogen production by Thermoanaerobacterium thermosaccharolyticum W16. BIORESOURCE TECHNOLOGY 2010; 101:2053-2058. [PMID: 19963370 DOI: 10.1016/j.biortech.2009.11.031] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2009] [Revised: 10/30/2009] [Accepted: 11/07/2009] [Indexed: 05/28/2023]
Abstract
The optimization of culture condition for enhanced hydrogen production by Thermoanaerobacterium thermosaccharolyticum W16 was conducted using statistical experimental design and analysis. Plackett-Burman design was first used to screen the most important variables influencing hydrogen production, and subsequently central composite design was adopted to investigate the optimum value of the selected factors for achieving maximum hydrogen yield. Experimental results showed that xylose, phosphate buffer, and yeast extract had significant influence on hydrogen production and the maximum hydrogen yield of 2.39 mol/mol xylose was predicted when the concentrations of xylose, phosphate buffer, and yeast extract were 12.24 g/L, 0.170 M, and 4.11 g/L, respectively. The results were further verified by repeated experiments under optimal conditions. The excellent correlation between predicted and measured values further confirmed the validity and practicability of this statistical optimum strategy.
Collapse
Affiliation(s)
- Guang-li Cao
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | | | | | | | | | | | | |
Collapse
|
72
|
Biological hydrogen production from organic wastewater by dark fermentation in China: Overview and prospects. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/s11783-009-0148-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
73
|
Yetilmezsoy K, Demirel S, Vanderbei RJ. Response surface modeling of Pb(II) removal from aqueous solution by Pistacia vera L.: Box-Behnken experimental design. JOURNAL OF HAZARDOUS MATERIALS 2009; 171:551-562. [PMID: 19577844 DOI: 10.1016/j.jhazmat.2009.06.035] [Citation(s) in RCA: 246] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2009] [Revised: 06/06/2009] [Accepted: 06/08/2009] [Indexed: 05/28/2023]
Abstract
A three factor, three-level Box-Behnken experimental design combining with response surface modeling (RSM) and quadratic programming (QP) was employed for maximizing Pb(II) removal from aqueous solution by Antep pistachio (Pistacia vera L.) shells based on 17 different experimental data obtained in a lab-scale batch study. Three independent variables (initial pH of solution (pH(0)) ranging from 2.0 to 5.5, initial concentration of Pb(II) ions (C(0)) ranging from 5 to 50 ppm, and contact time (t(C)) ranging from 5 to 120 min) were consecutively coded as x(1), x(2) and x(3) at three levels (-1, 0 and 1), and a second-order polynomial regression equation was then derived to predict responses. The significance of independent variables and their interactions were tested by means of the analysis of variance (ANOVA) with 95% confidence limits (alpha=0.05). The standardized effects of the independent variables and their interactions on the dependent variable were also investigated by preparing a Pareto chart. The optimum values of the selected variables were obtained by solving the quadratic regression model, as well as by analysing the response surface contour plots. The optimum coded values of three test variables were computed as x(1)=0.125, x(2)=0.707, and x(3)=0.107 by using a LOQO/AMPL optimization algorithm. The experimental conditions at this global point were determined to be pH(0)=3.97, C(0)=43.4 ppm, and t(C)=68.7 min, and the corresponding Pb(II) removal efficiency was found to be about 100%.
Collapse
Affiliation(s)
- Kaan Yetilmezsoy
- Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Esenler, Istanbul, Turkey.
| | | | | |
Collapse
|
74
|
Tang J, Yao Y, Ying H, Xiong J, Zhang L, Li Z, Bai J, Zhang Y, Ouyang P. Effect of NH4+ and glycerol on cytidine 5'-diphosphocholine synthesis in Saccharomyces cerevisiae. BIORESOURCE TECHNOLOGY 2009; 100:4848-4853. [PMID: 19467861 DOI: 10.1016/j.biortech.2009.04.045] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2008] [Revised: 04/13/2009] [Accepted: 04/22/2009] [Indexed: 05/27/2023]
Abstract
Both stimulation of ammonium ion on the glycolytic flux and regulation by glycerol of enzymes in Kennedy pathway for cytidine diphosphate choline production in S. cerevisiae were studied. The conventional transformation course featured four stages. Firstly, CMP and choline chloride were phosphorylated and CDP-choline was formed rapidly; secondly, the rate of CDP-choline formation declined and CMP was not detected in the mixture; thirdly, CMP was released and the CDP-choline concentration reached a peak; Fourthly, the compound concentrations did not practically changes eventually. Using the central composite design, the concentration, yield, and utilization efficiency of energy reached 24.7 mmol/L, 82.3% and 10.6%, with 30 mmol/L of ammonium ion and 1% (V/V) of glycerol, respectively. Ammonium ion not only strengthened the glycolytic pathway, but also coordinated the reaction rate between the glycolytic pathway and the Kennedy pathway. Glycerol alleviated the activity decrease of the key enzymes in the mixture.
Collapse
Affiliation(s)
- Jiapeng Tang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Life Science and Pharmaceutical Engineering, Nanjing University of Technology, No. 5 Xin Mo Fan Road, Nanjing, PR China
| | | | | | | | | | | | | | | | | |
Collapse
|
75
|
Hallenbeck PC, Ghosh D. Advances in fermentative biohydrogen production: the way forward? Trends Biotechnol 2009; 27:287-97. [PMID: 19329204 DOI: 10.1016/j.tibtech.2009.02.004] [Citation(s) in RCA: 166] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2008] [Revised: 01/28/2009] [Accepted: 02/04/2009] [Indexed: 11/18/2022]
Abstract
A significant effort is underway to develop biofuels as replacements for non-renewable fossil fuels. Among the various options, hydrogen is an attractive future energy carrier due to its potentially higher efficiency of conversion to usable power, low generation of pollutants and high energy density. There are a variety of technologies for biological hydrogen production; here, we concentrate on fermentative hydrogen production and highlight some recently applied approaches, such as response surface methodology, different reactor configurations and organisms that have been used to maximize hydrogen production rates and yields. However, there are significant remaining barriers to practical application, such as low yields and production rates, and we discuss several methods, including two stage processes and metabolic engineering, that are aimed at overcoming these barriers.
Collapse
Affiliation(s)
- Patrick C Hallenbeck
- Département de Microbiologie et Immunologie, Université de Montréal, CP 6128 Succursale Centre-ville, Montréal, Québec H3C 3J7, Canada.
| | | |
Collapse
|