Samar El-Mekkawi¹, Wafaa Abou-Elseoud², Shaimaa Fadel², Enas Hassan², Mohammad Hassan^2,*

Journal of Renewable Materials, Vol.12, No.9, pp. 1573-1591, 2024, DOI:10.32604/jrm.2024.053589 - 25 September 2024

Abstract Recycling of paper sludge waste is crucial for establishing a sustainable green industry. This waste contains valuable sugars that can be converted into important chemicals such as ethanol, poly hydroxybutyrate, and lactic acid. However, the main challenge in obtaining sugars in high yield from paper sludge is the high crystallinity of cellulose, which hinders hydrolysis. To address this, pretreatment using phosphoric acid was optimized using response surface methodology to facilitate cellulose hydrolysis with minimal energy and chemicals. The created prediction model using the response surface method considered factors such as acid concentration (ranging from 60%… More > Graphic Abstract

Ja-Ryong Koo¹, Hye Min Park¹, Se Kyung Kim², Hyun Shik Yun^1,*

Journal of Renewable Materials, Vol.7, No.4, pp. 365-372, 2019, DOI:10.32604/jrm.2019.04170

Abstract Lactic acid is an important organic acid that is widely used in the food, pharmaceutical, and cosmetic industries. Lactic acid was produced from coffee ground waste which contains fermentable sugars and is increasingly generated from our daily dietary life. Among 114 strains of Lactobacillus species, Lactobacillus rhamnosus ATCC 10863 was selected for the production of lactic acid from coffee ground waste. Through alkali pretreatment and saccharification, cellulose and hemicellulose in coffee ground waste were converted into fermentable sugars. Pretreatment experiments were conducted at various alkali solution, concentrations, and times. Alkali pretreatment with 35 g/L… More >