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Raffel Dharma Patria
Department of Biology, Hong Kong Baptist University, Kowloon, Hong Kong

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Journal article
Published: 08 April 2021 in Sustainable Chemistry
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The present work evaluates the techno-economic feasibility of a rhamnolipids production process that utilizes digestate from anaerobic digestion (AD) of food waste. Technical feasibility, profitability and extent of investment risks between fermenter scale and its operating strategy for rhamnolipids production was investigated in the present study. Three scenarios were generated and compared: production using a single large fermenter (Scenario I), using two small fermenters operated alternately (Scenario II) or simultaneously (Scenario III). It was found that all the scenarios were economically feasible, and Scenario III was the most profitable since it allowed the most optimum fermenter operation with utilization of multiple small-scale equipment to reduce the downtime of each equipment and increase the production capacity and overall productivity. It had the highest net present value, internal rate of return and shortest payback time at a discount rate of 7%. Finally, a sensitivity analysis was conducted to indicate how the variation in factors such as feedstock (digestate) cost, rhamnolipids selling price, extractant recyclability and process capacity influenced the process economics. The work provides important insights on techno-economic performance of a food waste digestate valorization process which would be useful to guide its sustainable scale-up.

ACS Style

Raffel Patria; Jonathan Wong; Davidraj Johnravindar; Kristiadi Uisan; Rajat Kumar; Guneet Kaur. Food Waste Digestate-Based Biorefinery Approach for Rhamnolipids Production: A Techno-Economic Analysis. Sustainable Chemistry 2021, 2, 237 -253.

AMA Style

Raffel Patria, Jonathan Wong, Davidraj Johnravindar, Kristiadi Uisan, Rajat Kumar, Guneet Kaur. Food Waste Digestate-Based Biorefinery Approach for Rhamnolipids Production: A Techno-Economic Analysis. Sustainable Chemistry. 2021; 2 (2):237-253.

Chicago/Turabian Style

Raffel Patria; Jonathan Wong; Davidraj Johnravindar; Kristiadi Uisan; Rajat Kumar; Guneet Kaur. 2021. "Food Waste Digestate-Based Biorefinery Approach for Rhamnolipids Production: A Techno-Economic Analysis." Sustainable Chemistry 2, no. 2: 237-253.

Journal article
Published: 08 July 2020 in Journal of Hazardous Materials
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As a platform chemical with various applications, succinic acid (SA) is currently produced by petrochemical processing from oil-derived substrates such as maleic acid. In order to replace the environmental unsustainable hydrocarbon economy with a renewable environmentally sound carbohydrate economy, bio-based SA production process has been developed during the past two decades. In this review, recent advances in the valorization of solid organic wastes including mixed food waste, agricultural waste and textile waste for efficient, green and sustainable SA production have been reviewed. Firstly, the application, market and key global players of bio-SA are summarized. Then achievements in SA production by several promising yeasts including Saccharomyces cerevisiae and Yarrowia lipolytica are detailed, followed by calculation and comparison of SA production costs between oil-based substrates and raw materials. Lastly, challenges in engineered microorganisms and fermentation processes are presented together with perspectives on the development of robust yeast SA producers via genome-scale metabolic optimization and application of low-cost raw materials as fermentation substrates. This review provides valuable insights for identifying useful directions for future bio-SA production improvement.

ACS Style

Chong Li; Khai Lun Ong; Zhiyong Cui; Zhenyu Sang; Xiaotong Li; Raffel Dharma Patria; Qingsheng Qi; Patrick Fickers; Jianbin Yan; Carol Sze Ki Lin. Promising advancement in fermentative succinic acid production by yeast hosts. Journal of Hazardous Materials 2020, 401, 123414 .

AMA Style

Chong Li, Khai Lun Ong, Zhiyong Cui, Zhenyu Sang, Xiaotong Li, Raffel Dharma Patria, Qingsheng Qi, Patrick Fickers, Jianbin Yan, Carol Sze Ki Lin. Promising advancement in fermentative succinic acid production by yeast hosts. Journal of Hazardous Materials. 2020; 401 ():123414.

Chicago/Turabian Style

Chong Li; Khai Lun Ong; Zhiyong Cui; Zhenyu Sang; Xiaotong Li; Raffel Dharma Patria; Qingsheng Qi; Patrick Fickers; Jianbin Yan; Carol Sze Ki Lin. 2020. "Promising advancement in fermentative succinic acid production by yeast hosts." Journal of Hazardous Materials 401, no. : 123414.