Comparison of Capacity for 2,3-Butanediol Production from Corn Cob Hemicelluose Hydrolysate Fermentation by Klebsiella oxytoca HD79 and Klebsiella pneumoniae

2014 ◽  
Vol 672-674 ◽  
pp. 147-153 ◽  
Author(s):  
Jing Ping Ge ◽  
Shou Feng Huang ◽  
Xing Lin Li ◽  
Chao Pan ◽  
Wen Xiang Ping
Keyword(s):  
Carbon Source ◽  
Renewable Resources ◽  
Corn Cob ◽  
Fermentation Capacity

Production of 2,3-Butanediol (2,3-BD) from renewable resources can be sustainable and inexpensive. Many studies have been done on the fermentation usingKlebsiellapneumoniae,KlebsiellaoxytocaandPaenibacilluspolymyxa. Although significant quantities of 2,3-BD have been accumulated by these bacteria, which one is the best strain of great fermentation capacity still be insensible. In this paper,KlebsiellapneumoniaandKlebsiellaoxytocaHD79 were opt to ferment concentrated and non-detoxified corn cob hemicelluose hydrolysate and concentrated detoxified hydrolysate. Then glucose was utilized as carbon source to verify the quality of the hydrolysate. At last, we compared the fermentation capacity between them. The results showed thatK.pneumoniaehas more resistance with inhibitors thanK.oxytocaHD79,which has showed better ability of producing 2,3-BD.K.pneumoniaemight be a promising strain for 2,3-BD production using renewable resources.

The Cooling Rate Effect on Graphene Synthesis Using Low Pressure Chemical Vapor Deposition

2021 ◽  
Author(s):  
Byoungdo Lee ◽  
Weishen Chu ◽  
Wei Li
Keyword(s):  
Chemical Vapor Deposition ◽  
Reaction Time ◽  
Carbon Source ◽  
Cooling Rate ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Feeding Time ◽  
Process Variables ◽  
Pressure Chemical

Abstract Low-pressure chemical vapor deposition (LPCVD) is the most efficient method to synthesize large-scale, high-quality graphene for many potential applications such as flexible electronics, solar cells, and separation membranes. The quality of LPCVD is affected by process variables including methane/hydrogen (CH4/H2) ratio, time, pressure, temperature, and cooling rate. The cooling rate has been recognized as one of the most important process variables affecting the amount of carbon source, nucleation, reaction time, and thus the quality of the LPCVD. In this research, we investigate the effect of cooling rate on the quality of graphene synthesize by changing the cooling rate and the gas feeding time. Graphene coverage is measured by Raman mapping. It is found that fast cooling rate leads to decreased carbon source reaction time, which in turn results in higher coverage by monolayer graphene. The temperature-dependent gas feeding time corresponding to different cooling rates can be used to properly supply the carbon source onto the copper surface, also leading to a higher graphene coverage.

scholarly journals ADSORPSI KARBON AKTIF DARI TONGKOL JAGUNG SEBAGAI ADSORBEN ION LOGAM Cu2+

2017 ◽  
Vol 2 (1) ◽  
pp. 24
Author(s):  
Dewi Putri Yuniarti
Keyword(s):  
Adsorption Capacity ◽  
Active Carbon ◽  
Metal Ion ◽  
Agricultural Waste ◽  
Mesh Size ◽  
Ash Content ◽  
Corn Cob ◽  
Waste Water Sample ◽  
Work Shop

Many reseerches about agricultural waste shows potency from this waste to be used as high quality of active carbon that can be used as (adsorbent) on gasoline and substances dissolved at solution. One of agricultural result in South Sumatera that is enough corn cob, where is solid waste that throun just. It is impossible since corncob contains about 40 % of cellulose. So, cellulose which can be used as an active carbon. There are two basic processes in the active carbon making, those are carbonization and activation. The aim of this study was to find out how the activated time gave influence to the adsorption capacity of active carbon as the metal ion Cu2+ adsorbent. The obtained data were analysed by using Atomic Adsorption Spectrophotometry (SNI 06-6989.6-2009). Moreover, the characteristic of the active carbon was ansalysed by Standart Nacional Indutrial (SNI 06-3730-1995). From the result of study, it was obtained that the activated time of 60 minutes with the activator H3PO4 0,5 M had the best adsorption capacity of 1.97 mg/g with the metal ion Cu2­+ concentration was 0,80 ppm. The characteristic of the missing part 9500C  20.54 %, water content of 11 %, ash content of 7 % and iodine number of 750.35 mg/g, pure active carbon 72.46 %, the density of bulk 0.31 g/ml, pass for the mesh size of 325 is 98 %. The adsorption capacity of active carbon from the corncob to the metal ion Cu2+ taken from the waste water sample at the shipyard painting work shop in Palembang was 0.1644 mg/g (97.60 %). Key words : Activated Carbon, Corn cob, Adsorption, AAS,  Copper (II) Metal Ion.

Effects of Plant Density on the Quality of Cobs Used for Corn Cob Pipes 1

Crop Science ◽  
1976 ◽  
Vol 16 (5) ◽  
pp. 706-709 ◽  
Author(s):  
P. J. Loesch ◽  
C. F. Stark ◽  
M. S. Zuber
Keyword(s):  
Plant Density ◽  
Corn Cob

The quantity and quality of dissolved organic matter as supplementary carbon source impacts the pesticide-degrading activity of a triple-species bacterial biofilm

2013 ◽  
Vol 98 (2) ◽  
pp. 931-943 ◽  
Author(s):  
Benjamin Horemans ◽  
Johanna Vandermaesen ◽  
Philip Breugelmans ◽  
Johan Hofkens ◽  
Erik Smolders ◽  
...  
Keyword(s):  
Organic Matter ◽  
Carbon Source ◽  
Dissolved Organic Matter ◽  
Bacterial Biofilm

Composting as a cleaner strategy to broiler agro-industrial wastes: Selecting carbon source to optimize the process and improve the quality of the final compost

2017 ◽  
Vol 142 ◽  
pp. 2084-2092 ◽  
Author(s):  
Mônica Sarolli Silva de Mendonça Costa ◽  
Francieli Helena Bernardi ◽  
Luiz Antonio de Mendonça Costa ◽  
Dercio Ceri Pereira ◽  
Higor E. Francisconi Lorin ◽  
...  
Keyword(s):  
Carbon Source ◽  
Industrial Wastes

scholarly journals Soil Quality Engineering Using Vermicompost and its Effect on the Corn (Zea mays L.) Production in Coastal Area

2020 ◽  
Vol 25 (3) ◽  
pp. 127
Author(s):  
Riwandi Amir Diny ◽  
Hasanudin Hasanudin ◽  
Herry Gusmara ◽  
Anandyawati Anandyawati
Keyword(s):  
Soil Quality ◽  
Zea Mays L ◽  
Soil Analysis ◽  
Block Design ◽  
Organic Fertilizer ◽  
Corn Cob ◽  
Highest Weight ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

The low quality of Entisol is caused by low availability of nitrogen, phosphorus, and potassium as well as low soil pH, so the addition of vermicompost is necessary. The purpose of this study was to determine the effect of vermicompost application on soil quality and to obtain the highest vermicompost dosage on the availability of nutrients such as N, P, K, and the yield of corn. The field experiment used a Randomized Completely Block Design (RCBD) with 7 dosages of vermicompost and three replications. The treatments were V0 = 0; V1 = 5; V2 = 10; V3 = 15; V4 = 20; V5 = 25; V6 = 30 Mg ha-1. Variables observed consisted of 1) initial soil and vermicompost characterization analysis, 2) soil analysis and N, P, and K content in leaves, and yield of corn. The results showed that Entisol was classified as low quality; however, vermicompost quality complied with the requirements of quality organic fertilizer. The experiment also indicated that the highest pH of Entisol (5.31) and K content in corn leaves (2.12%) were obtained at a dose of vermicompost 25 Mg ha-1. Meanwhile, the highest weight of husked corn cobs (415.55 g plant-1) and weight of unhusked corn cob (351.11 g plant-1) were obtained at a vermicompost dose of 15 Mg ha-1.

scholarly journals On some implementations of solving the resource constrained project scheduling problems

2019 ◽  
Vol 29 (1) ◽  
pp. 31-42 ◽  
Author(s):  
E.Kh. Gimadi ◽  
E.N. Goncharov ◽  
D.V. Mishin
Keyword(s):  
Renewable Resources ◽  
Project Scheduling ◽  
Resource Constraints ◽  
Scheduling Problems ◽  
Makespan Minimization ◽  
Resource Constrained ◽  
Resource Constrained Project Scheduling ◽  
Project Scheduling Problem ◽  
Technological Constraints

We consider a resource-constrained project scheduling problem with respect to the makespan minimization criterion. The problem accounts for technological constraints of activities precedence together with resource constraints. Activities pre- emptions are not allowed. The problem with renewable resources is NP-hard in the strong sense. We propose an exact branch and bound algorithm for solving the problem with renewable resources. It uses our new branching scheme based on the representation of a schedule in form of the activity list. We use two approaches of constructing the lower bound. We present results of numerical experiments, illustrating the quality of the proposed lower bounds. The test instances are taken from the library of test instances PSPLIB.

scholarly journals Physicochemical and microbiological dynamics in composting of organic waste using a new bioreactor model

2020 ◽  
Author(s):  
Suelen Gaspar ◽  
Lucas Assis ◽  
carla Carvalho ◽  
Gustavo Ferreira ◽  
Rosane Schwan ◽  
...  
Keyword(s):  
Filamentous Fungi ◽  
Renewable Resources ◽  
Organic Waste ◽  
Environmental Risks ◽  
Starter Cultures ◽  
Control Treatment ◽  
Organic Residues ◽  
Composting Process ◽  
Mature Compost

Abstract Background It is important to use renewable resources to minimize the environmental risks and the composting is one of the most sustainable methods for the management of organic waste. Methods The objective of this work was to evaluate the physicochemical dynamics of microorganisms and to study cultivable microorganisms during the composting process of organic residues in a new model of bioreactor. The formulation of a possible cocktail of microorganisms selected for use as a compound accelerator will be further investigated. In addition, the use of two inoculants (non-commercial inoculum (NCI)) and commercial inoculum (CI)) and a control without inoculant during the composting process will be analyzed to evaluate its efficiency. Composting was performed by mixing organic waste from the garden waste and University Restaurant, obtaining an ideal C/N ratio of 30:1. The composting process was carried out in 1 m3 composters with controlled temperature and aeration. Results The thermophilic phase for all treatments was reached by the second day. Mature compost was obtained after an average of 120 days and composting in all treatments showed an increase in the availability of P and micronutrients. During composting, the population of bacteria and actinobacteria were higher than those of yeasts and filamentous fungi. Conclusions Increased composting efficiency was observed when starter cultures were used, the treatments presented advantages such as greater mineralization of P-available and micronutrients as Mn and Zn, in terms of the quality of the final product in comparison to the control treatment.

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