Utilization of Response Surface Methodology in Optimization of Extraction of Plant Materials

Pretreatment is a critical step in the conversion of lignocellulose to fermentable sugars. In this work, Miscanthus straw was pretreated with ammonium carbonate (Na2CO3), which was shown by earlier works to be an effective pretreatment of grass stovers and other plant materials in the context of ethanol production. Here, we explored several key parameters including Na2CO3 concentration (2–6%), temperature (120–160°C), and reaction time (10–30 min) to evaluate their effects on enzymatic digestibility using response surface methodology. The best conditions were found to be Na2CO3 of 4.4%, temperature of 150.7°C, and reaction time of 20.0 min, under which glucose yield reached to 294.5 g/Kg biomass.

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Optimization of Coagulation-flocculation Process for Pre-treatment of Artisanal Tannery Wastewater Using Response Surface Methodology

10.21203/rs.3.rs-838770/v1 ◽

2021 ◽

Author(s):

Miriam Appiah-Brempong ◽

Helen Michelle Korkor Essandoh ◽

Nana Yaw Asiedu ◽

Samuel Kwame Dadzie ◽

Francis Yao Momade

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Oxygen Demand ◽

Tannery Wastewater ◽

Volume Index ◽

Aluminium Sulphate ◽

Plant Materials ◽

Initial Ph ◽

Pre Treatment ◽

Flocculation Process

Abstract There is a dearth in knowledge on artisanal tannery wastewater treatment as most studies are focused on treatment of wastewater generated from modern-day leather manufacturing industries. The extensive use of plant materials in artisanal tanneries introduces high loads of polyphenolic compounds in the wastewater rendering biological treatment of the wastewater ineffective. This study, therefore, employed coagulation-flocculation process to pre-treat artisanal tannery wastewater with the aim of applying the central composite design, a statistical approach in Response Surface Methodology (RSM) to model and optimize the removal of Chemical Oxygen Demand (COD), Total Suspended Solids (TSS) and turbidity and to minimize Sludge Volume Index (SVI). Optimization process focused on the two most important influencing parameters: dosage of aluminium sulphate and initial pH of wastewater. Results revealed that optimal pH and aluminium sulphate dosage of 6.09 and 11.6g/L respectively could yield maximum removal efficiencies of 38.51% of COD, 76.05% of TSS and 79.64% of turbidity from the wastewater with a minimum SVI of 29.57mL/g. Further experiments conducted to validate these results showed a good agreement between the experimental and predicted results signifying the suitability of RSM for optimization of the coagulation treatment process. This is the first reported study on optimization of coagulation-flocculation treatment of artisanal tannery wastewater. Results of this study can be used practically for efficient pre-treatment of artisanal tannery wastewater.

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OPTIMIZING THE PROCESSING OF GINGER ESSENTIAL OIL YIELD (Zingiber collinsii) FROM PUMAT NATIONAL PARK OF VIETNAM USING THE RESPONSE SURFACE METHODOLOGY

Vietnam Journal of Science and Technology ◽

10.15625/2525-2518/55/5a/12201 ◽

2018 ◽

Vol 55 (5A) ◽

pp. 242

Author(s):

Le Thi My Chau

Keyword(s):

Response Surface Methodology ◽

Essential Oil ◽

Response Surface ◽

National Park ◽

Oil Yield ◽

Plant Materials ◽

Box Behnken Design ◽

Plant Extraction ◽

Final Optimization ◽

Essential Oil Yield

In Vietnam, ginger (zingiber) belonging to ginger family (zingiberaceae) is a valuable spice plant. Extraction is the first step of great importance for the recovery and purification of essential oil from plant materials. In this paper, we studied on the factors that affect the process of total essential oil extraction from ginger roots originated from Pu Mat National Park, Nghe An province. The total essential oil yield extraction from ginger roots was optimized using Response Surface Methodology (RSM) with experimental order of Box-Behnken design. The final optimization value for yield of ginger essential oil is at 570 ml water to 100 g sample at 290 minutes of steam distillation using 1.09 mm material thickness size. In this condition, the maximum total essential oil yield was predicted to be 1.23 %.

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