Saturday, September 27, 2008

Fodder yeast production: A new approach for distillery vinasse treatment

By M. A. Otero Rambla, G. Saura Laria, J. A. Martínez Valdivielso, O. A. Almazán del Olmo

Biotechnology Division Cuban Institute for Research on Sugar Cane By-Products (ICIDCA)
Vía Blanca 804 & Carretera Central, Havana 11000, Cuba


Distillery vinasse is one of the most contaminating industrial wastes and, for a full development of an ethanol industry, this problem has to be solved. The study was conducted at lab scale in a yeast factory using raw materials from industry.
Through this technology, the organic load of vinasse was reduced by 75% when the process was carried out batch wise or slightly over 60% in continuous mode. Important amounts of high quality proteins with relatively high yields (about 60 cubic metres of vinasse per tonne of yeast on a dry matter basis) can be obtained in parallel with wastewater treatment. Distillery vinasse can be utilized as the sole source of carbon in fodder yeast production. Addition of growth enhancer QZ-350 at a ratio of 1 to 3 kg/t of yeast, substitutes 1.1 tonnes of molasses.
If protein production is the main target, continuous culture is the indicated choice. However, if environmental issues prevail, batch mode is preferred since it leads to a higher depletion of organic matter (potential pollution) in the propagation medium.

Keywords : yeast, distillery vinasse, wastewaters treatment, microbial protein, bioprocess

ISSCT XXVIth CONGRESS Durban, South Africa 29th July - 2nd August 2007)

Monday, September 22, 2008


Sugar Research and Innovation, Queensland University of Technology, Brisbane, Australia



Sugar Research and Innovation (SRI) has been involved for some years in developing aspects of bagasse gasification technology. This has been undertaken with the long-term aim of implementing advanced cycle, high efficiency power generation in the sugar industry or the production of a gaseous feedstock for alcohols and other industrial commodities.
Many of the R&D outcomes achieved at SRI in the area of gasification can be traced back to the formation in 1998 of the Queensland Biomass Integrated Gasification (QBIG) program. This program was set up to develop gasification for boosting power generation in the sugar industry. Under the QBIG program, major research projects were undertaken in the areas of bagasse and cane trash gasification kinetics, ash characteristics in bagasse gasifiers, the development of a continuous pressurised bagasse feeder, cane harvest residue recovery systems to improve gasifier utilisation and economies of scale as well as a financial appraisal of gasification for power generation. It became evident from this latter study that there was significant scope for reducing costs via a staged and highly factory integrated introduction of this technology, and a study was initiated to determine optimum strategies for the large scale adoption of gasification technology across the industry.
On a more fundamental level, SRI has been collaborating with Hokkaido and Monash universities in a project aimed at utilising the potassium that occurs naturally in biomass as a catalyst in cracking high molecular weight tars produced during gasification. This catalysed reforming process occurs at relatively low temperatures (500°C to 700°C) and has the potential to deliver significant gasifier cost and efficiency advantages. The role of SRI in this project has been to develop computational fluid dynamics (CFD) and process models with which to implement laboratory data in a thermodynamically optimised gasification cycle.
This paper draws together the R&D activities undertaken at SRI to provide a positive picture with respect to the technical feasibility of implementing gasification technology for power generation and highlights some of the financial barriers to the large scale adoption of the technology in Australia.

KEYWORDS: Bagasse, gasification, catalyst, ash, kinematics, co-generation
(ISSCT XXVIth CONGRESS Durban, South Africa 29th July - 2nd August 2007)

Wednesday, September 17, 2008

Feed value of sugarcane by-products


Ma. Lourdes I Dormido and Ma. Lourdes T. Escarilla

The Total Digestible Nutrients (TDN) values, indicative of the relative energy value of a food to an animal, were evaluated on cane tops of ten popular Philippine sugarcane varieties in the first study; and ten treatment combinations of cane tops, molasses and bagasse with some supplementation in the second study.
The TDN values of the cane tops sampled among the ten varieties had highly significant differences. The highest TDN value of 72.03 and crude fiber content of 39.16% were those of Phil. 7495. TDN values of Phil 7115, Phil 6553, Phil 58260, Phil 7779 and Phil 6607 were statistically comparable to Phil 7495.
The differences among the TDN values of the ten treatment combinations in the second study were highly significant. The treatment combination IX (cane tops-0; molasses-15% bagasse-85%+urea) yielded the highest TDN value (72.12), followed by combination VII (cane tops-42.5%; molasses-15%; Bagasse-42.5%+urea). Both treatments were statistically comparable.
The sugarcane farmers/millers with an integrated cattle production scheme may therefore choose their raw materials for feed from the figures presented, and also make the choices according to the availability of materials.

North Avenue, Diliman, Quezon City, Philippines, 1100
Tel. Nos# (632)928-7990; (632)928-0666

Monday, September 15, 2008


Aris Toharisman and Hendro Santoso M
(Indonesian Sugar Research Institute)


Desugarization of sugar cane molasses using ion exclusion chromatography produces reduction sugar fraction (RSF). The study on the use of RSF as a medium on ethanol production in batch culture using Saccharomyces cerevisiae R5 has been carried out. The overall ethanol yield during 32 hours fermentation with 6,7% initial sugar contents was 3,34% or Yp/s = 0,48 g ethanol/ g sugars. The result was similar to the Yp/s on molasses media with 6,94% initial sugars performed as a control. Other parameter kinetics suh as the specific growth rate of Saccharomyces cerevisiae R5 (mmax), sugar (substrate) up take rate (qs) and ethanol production rate (qp) of both media were also relatively similar. However, the biomass yield (Yx/s) produced on RSF medium was lower than that on molasses medium.

Key words : Desugarization, ion-exclusion chromatography, ethanol fermentation, sugar cane molasses, S.cerevisiae and batch culture.

(Indonesian Sugar Research Journal Vol.XXXIII (4) Desember 1997 :34-39)

Thursday, September 11, 2008


Wiwit Budi Widyasari and Eka Sugiyarta
(Indonesia Sugar Research Institute)
Jl.Pahlawan 25 Pasuruan Indonesia


Proline is rather unique among the amino acids in its accumulation during drought stress. Under drought-stressed condition, free proline content in leaf tissues increase proportionately faster than other amino acids. Within the leaves of unstressed plant, free proline contents are very small and its accumulation increases up to one hundred times than the normal, when the plant suffers from drought stress. The ability to accumulate free proline in drought-resistance varieties was significantly stronger than that of the susceptible varieties and that the reducing rate of free proline was significantly faster compared to the susceptible varieties during the post-stressed period. A tremendous free proline accumulation is one of the most dramatic physiological characteristics, so this can be used as selction criteria for drought resistant varieties.

Key words : Free-proline, drought-stress, amino acid, drought-resistant.

(Indonesian Sugar Research Journal Vol. XXXIII (1), Maret 1997 : 1-10
E-mail : )

Saturday, September 6, 2008


Theresia Hari Sutji W
(Indonesia Sugar Research Institute)
Jl.pahlawan 25 Pasuruan


Five samples of molasses (A,B,C,D and E) have been stored in the laboratory at temperature from 30 – 35o C for 48 weeks. The samples were analyzed for brix, sucrose, reducing sugars and total sugar as invert (TSAI) every two weeks. The test showed that the sugars decreased during storage. The average decrease was 5,54 % for TSAI; 10,8% for reducing sugars ; 3.4% for brix. The average decrease of sucrose content of three samples (A,C and E) was 3,2% and the other two samples (B and D) remain constant. The TSAI, reducing sugar, sucrose and brix of molasses A (which has the lowest original TSAI) decreased sharply during observation, e.g 10,6% for TSAI, 14,5% for reducing sugar, 5,2% for sucrose and 3,8% for brix respectively. The fact that decrease of sucrose occurred without reducing sugar increase indicates that there may be a particular reaction between sucrose or reducing sugar and other molasses component during storage.

Key words : decrease, sugar molasses, storage

(Indonesian Sugar Research Journal Vol. XXX (1), Maret 1994 : 7-14
E-mail : )

Thursday, September 4, 2008


Edi Purnomo
(Indonesia Sugar Research Institute)
Jl.pahlawan 25 Pasuruan


This research was conducted to improve the hygiene of mill station area by adjusting the pH condition of the mill juices in order to prevent sucrose inversion. The clear solution of milk of lime with concentration of 3o Beaume was used for udjusting the pH of the mill juices. The clear solution of milk of lime was distributed individually to the drawing tanks of mill juices. The pH target of the mill juices is between 6.3 to 7.0. The results showed that there were an increase of the ratio of mixed juice and fisrt expressed juice from 93.30 to 94.96 ; a decrease of the formation of reducing sugar about 93,11%; an increase of the brightness of clear juice about 26,14%; a reduction of the lime content of clear juice about 10,57% ; a reduction of the amylum content on mixed juice about 25,29% and no dextran formation between the first expressed juice to the mixed juice. Some advantages of massecuites physical properties are also described in this paper.

Key words : milk of lime clear solution, inversion, hygiene, pre –defecation.

(Indonesian Sugar Research Journal Vol. XXX (2), June 1994 : 1-9
E-mail : )

Monday, September 1, 2008

Production of sugarcane juice concentrate


Dida V. Gatanela, Ma. Lourdes T. Escarrilla, Nelsie Grace E. Gela, Teresita O. Macuro

Research for alternative high value products from sugarcane lead to the development of the process of preparing a quality beverage from sugarcane juice. The conducted study attained a quality beverage with prolonged shelf life. Clarifying and stabilizing properties of honey were utilized as honey was added to extracted cane juice, thus, eliminating costlier processes of filtration and centrifugation. Varying ratios of honey to sugarcane juice, and sodium benzoate, 0.1% (w/v), and citric acid, 0.1% (w/v) were observed for six weeks. Titratable acidity, pH values, Brix and reducing sugar content were monitored weekly.
For a period of twenty-one days, unrefrigerated preparations of sugarcane juice-honey concentrated with ratios of 9:1 and 9.5:0.5, and sodium benzoate, 0.1% (w/v), were found statistically comparable in titratable acidity values. These treatments were observed to be very significantly different from all other treatments.

North Avenue, Diliman, Quezon City, Philippines, 1100
Tel. Nos# (632)928-7990; (632)928-0666