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Balagopalan, C.; Rajalakshmy, L.

doi:10.1023/a:1004992611810

Cited by 25 publications

(4 citation statements)

References 13 publications

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“…Burning the cassava stalks will convert all C to CO 2 , so CO 2 emissions from wastewater treatment and wastewater co-treatment options (from ww_m1 to ww_m5) are described in Eq. ( 32): (32) Regarding CO 2 emission from peel treatment process, 56% of contained C in peels will be decomposed to CH 4 or CO 2 . For the option that CH 4 is not recovered and burned, the conversion coefficient of 1 kg CH 4 to 25 kg CO 2 is applied as in Eq.…”

Section: Calculation Of Co2 Accumulation From Farming and Production ...mentioning

confidence: 99%

“…During the processing of cassava, nearly 92% of HCN goes into wastewater, 5.2% goes into solid waste (cassava pulp), 1.5% evaporates from drying process, and about 0.41% in dry cassava starch products [31]. Accumulation of cyanide compounds in the environment around cassava starch production plants with concentration of HCN in groundwater was 1.2-1.6 mg/L [32]. Calculations from the material balances of a previous research work [33] show that solid waste accounts for 10-15% of fresh cassava.…”

Section: Introductionmentioning

confidence: 99%

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Application of Linear Programming for cassava starch production optimization in Vietnam within a Circular Economy framework toward Zero emission

Giau¹,

Thanh²,

Luu³

et al. 2022

Environmental Engineering Research

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Cassava starch production is a key industrial production of Tay Ninh province, Vietnam. However, this production chain has also caused many negative impacts on the environment. This study applied the principles of circular economy to analyze the waste streams via linear programming method for cassava starch circular production chain towards zero waste emission. The results show that the cassava starch indutry can achieve the goals of zero electricity, zero waste, and zero fossil energy by re-planning the production chain. The chain’s output products are 517.5 tons of bio-oil/year, 206.7 thousand tons of biochar/year, 190.0 thousand tons of dry pulp/year, 10 million m<sup>3</sup>/year of liquid fertilizer. In order to increase further the value of the chain in the circular economy, future research needs to study the feasibility of a solution to reuse wastewater to produce microalgae, as well as evaluate the effectiveness of these methods. The optimization method applied in this study can also be extended to similar agricultural chains properties such as rice processing, sugar cane, etc.

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Section: Calculation Of Co2 Accumulation From Farming and Production ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of Linear Programming for cassava starch production optimization in Vietnam within a Circular Economy framework toward Zero emission

Giau¹,

Thanh²,

Luu³

et al. 2022

Environmental Engineering Research

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“…Linamarin produces the toxic compound hydrogen cyanide (HCN) through enzymatic hydrolysis which can be hazardous to the consumer [6]. HCN is released during peeling, slicing and crushing often found in the wastewater discharges [7]. The detected cyanide level in cassava wastewater ranged between 10.4 and 274 mg/L depending upon the cyanogen glycoside content of the cassava varieties [8].…”

Section: Introductionmentioning

confidence: 99%

Comparative study on treatment of cassava wastewater using free, immobilized and biofilm of Trichoderma harzianum - Trichoderma viride consortium

Saravanan¹,

Kumari²,

Sriram³

2019

DWT

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a b s t r a c tCassava (Manihot esculenta) being rich in starch is one of the critical industries in the agro-industrial sector. The present study aims to do a comparative study on the treatment of cassava wastewater using biological and eco-friendly treatment approaches consisting of native bacterial species and fungal consortium in free, immobilized and biofilm batch mode. Studies were performed using the mixed culture of native bacteria, and the results were compared with that of a mixed fungal consortium of Trichoderma harzianum and Trichoderma viride which were known for its cyanide degrading efficiency and reducing COD burden. Cyanide and COD were two critical pollutants for the study. The effect of treatment time on cyanide and COD removal was investigated without adding any buffer to the wastewater. The maximum cyanide and COD removal efficiency for wastewater by using mixed native bacterial were 41.12% and 53.07% respectively. The removal efficiency by mixed bacterial culture was not too high owing to the low pH of cassava wastewater. Even in the low pH of cassava wastewater the maximum cyanide and COD removal efficiency using fungal consortium were 63.77% and 74.3% respectively. The growth pattern of fungal consortium reveals that six days treatment period showed maximum biomass of 3.721 g/L of dry weight. Thus, six days of treatment of fungal consortium can be used for the treatment of cassava wastewater. Furthermore, the optimized value of temperature and inoculums dosage for fungal consortium was found to be 30°C and 4% (v/v) of wastewater. Under optimized condition free, immobilized and biofilm batch reactors were setup. Biofilm batch reactor gave COD removal efficiency of 88% followed by suspension with 83.5% and least in an immobilized batch reactor with 76.5%. Cyanide removal efficiencies of 98.19%, 77%, and 87% were obtained in a biofilm, suspension and immobilized system respectively. The experimental results showed that final pH after treatment in all three systems was in dischargeable limits. The study revealed that the biofilm batch reactor which gave the highest removal efficiency could be considered as the best method for treatment of cassava wastewater.

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“…The starch rich cassava peel can be manipulated to produce bioethanol. The bitterness of cassava peel requires expensive processing techniques to make it edible (Balagopalan and Rajalakshmy 1998). The cyanogenic compounds present in the non-edible part of cassava causes several health related issues which include cancer, Diabetes mellitus, neurological disorder and iodine deficiency (Oluwole et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Saccharification and Single Step Fermentation of Cassava Peel by Mixed Culture of Saccharomycopsis fibuligera NCIM 3161 and Zymomonas mobilis MTCC 92

Pandian¹,

Suganya²,

Sivamani³

et al. 2016

AJBB

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The main objective of this study was to utilize the cassava peel by saccharification and single step fermentation (SSF) by mixed culture of Saccharomycopsis fibuligera NCIM 3161 and Zymomonas mobilis MTCC 92. Single step fermentation was performed in conical flasks with various concentrations of cassava peel (30, 50, 70 and 90 g/L), pH (3.5, 4.5 and 5.5), temperature (37, 47 and 57°C), reaction time (72, 720 and 168 h), inoculum size (5, 10 and 15 % v/v) and agitation speed (50, 100 and 150 rpm). Cell growth was identified by measuring optical density at 660 nm. The total reducing sugars were determined by centrifuging at 5000 rpm for 10 min by 3,5-dinitrosalicylic acid method. Starch concentration was estimated by anthrone method. Ethanol concentration was determined by acid dichromate method. The optimum process conditions were substrate concentration of 70 g/L, pH of 4.5, temperature of 37°C, reaction time of 120 h, inoculum size of 10 % (v/v) and agitation speed of 100 rpm. Under these conditions, the highest ethanol concentration of 26.46 g/L was obtained for cassava peel (93.75 % of theoretical yield).

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Cited by 25 publications

References 13 publications

Application of Linear Programming for cassava starch production optimization in Vietnam within a Circular Economy framework toward Zero emission

Application of Linear Programming for cassava starch production optimization in Vietnam within a Circular Economy framework toward Zero emission

Comparative study on treatment of cassava wastewater using free, immobilized and biofilm of Trichoderma harzianum - Trichoderma viride consortium

Saccharification and Single Step Fermentation of Cassava Peel by Mixed Culture of Saccharomycopsis fibuligera NCIM 3161 and Zymomonas mobilis MTCC 92

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