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ÌâÄ¿£ºRemoval of Nitrogen oxides from Tail Gases by Immobilized
Microorganisms Technology
×÷Õߣº*Ren xiaoli, Zhu kaijin, Zhao runzhu

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ÌâÄ¿£ºThe breeding of Aspergillus niger for citric acid fermentation
by UV and NTG compound mutation

×÷ÕߣºREN Xiao-li, ZHAO Lin, YANG Bao-Qiang, ZHAO Run-Zhu

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yuyiwhut08

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rxl2010(½ð±Ò+10):ºÃ 2010-09-20 21:09:46
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4Â¥2010-09-20 20:39:24
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FN ISI Export Format
VR 1.0
PT  J
TI  Removal of Nitrogen oxides from Tail Gases by Immobilized Microorganisms Technology
AU  Ren, XL
Zhu, KJ
Zhao, KZ
ED  Yin, J
Wei, X
Dai, X
CT  6th International Symposium of Asia-Institute-of-Urban-Environment
CY  SEP 20, 2009
CL  Changchum, PEOPLES R CHINA
SO  6TH INTERNATIONAL SYMPOSIUM OF ASIA INSTITUTE OF URBAN ENVIRONMENT: ENERGY CONSERVATION AND CARBON OFF IN ASIA CITY
BP  775
EP  778
PY  2009
TC  0
AB  As we all know, nitrogen oxides(NOX) are important air pollutants, which not only are harmful to human body, but also cause acid rain or photochemical smog. This paper deals with the removal of nitrogen oxides from tail gases by immobilized microorganisms, nitrifying bacteria and denitrifying bacteria from activated sludge in sewage treatment plant are co-immobilized by adopting different materials, which including the agar, activated carbon, PVA and sodium alginate etc., the effects of different methods of immobilization on NOX removal rate are studied, the results show that immobilized microorganisms using activated carbon as carrier is superior to the other immobilization methods, the maximum NOX removal rate of 95.62% is obtained and the outlet NOX concentration is lower than 100mg/m(3); in addition, the mass transfer mechanism of NOX in bio-filter is also investigated; the results show that the NOX liquid-phase mass transfer rate is faster than biochemistry reaction rate, majority of NOX transfer into liquid phase and are degraded by microorganisms in liquid phase, the influence of residence time on NOX removal rate is also researched, the optimal residence time is about 7s.  
UT  WOS:000280141700173
ER
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2Â¥2010-09-20 20:36:39
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yuyiwhut08

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Accession number:  20102813077229

Title:  Breeding of aspergillus niger for citric acid fermentation by UV and NTG compound mutation

Authors:  Ren, Xiao-Li1, 2 ; Zhao, Lin1 ; Yang, Bao-Qiang2 ; Zhao, Run-Zhu2  

Author affiliation:  1  School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China

2  Department of Environmental Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China


Corresponding author:  Zhao, L. (zhaolin@tju.edu.cn)  

Source title:  Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology

Abbreviated source title:  Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)

Volume:  43

Issue:  6

Issue date:  June 2010

Publication year:  2010

Pages:  553-556

Language:  Chinese

ISSN:  04932137

CODEN:  TCHHA9

Document type:  Journal article (JA)

Publisher:  Tianjin University, Tianjin, 300072, China

Abstract:  In order to raise the productivity of citric acid, the breeding of Aspergillus niger for citric acid fermentation by ultraviolet(UV) and NTG compound mutation has been studied in this paper. A niger UN-08 has been obtained through a series of screening, which has genetic stability and the citric acid yield of 15.80 g/100 mL, 26.40% higher than that of the original niger, the conversion rate of sugar to acid of 98.75% and the fermentation index of 1.32 kg/(m3¡¤h). In addition, the influence of the main technological parameters on the yield of citric acid for niger UN-08 has been studied, which indicates that the optimal number of spores is 106-108 N/mL, the best temperature of fermentation ranges from 34¡ãC to 36¡ãC, and ventilation volume should be kept around 0.12 m3/(m3¡¤min)in the early stage (0-40 h) and around 0.15 m3/(m3¡¤min)in the latter stage (40-96 h).

Number of references:  9

Main heading:  Acids

Controlled terms:  Citric acid  -  Fermentation  -  Sugar (sucrose)

Uncontrolled terms:  Aspergillus niger  -  Conversion rates  -  Genetic stability  -  Niger  -  Optimal number  -  Technological parameters  -  Ultra-violet  -  UV- and

Classification code:  822.3 Food Products  -  822 Food Technology  -  805.1.1 Biochemical Engineering  -  804.1 Organic Compounds  -  804 Chemical Products Generally  -  803 Chemical Agents and Basic Industrial Chemicals  -  802.2 Chemical Reactions  -  801.2 Biochemistry  -  461.8 Biotechnology

Database:  Compendex

   Compilation and indexing terms, © 2010 Elsevier Inc.
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3Â¥2010-09-20 20:38:17
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