Fang Qian, Ji Sinmin, Huang Dingwu, Huang Zhouyue, Huang Zilong, Zeng Yunyi, Liu Yu
Department of Municipal Engineering, College of Civil Engineering, Guangzhou University, Guangzhou 510006, China.
Biochem Res Int. 2019 Jan 23;2019:8489747. doi: 10.1155/2019/8489747. eCollection 2019.
This study explores the use of alkaline pretreatments to improve the hydrolyzation of rice husks to produce volatile fatty acids (VFAs). The study investigated the effects of reagent concentration and pretreatment time on protein, carbohydrates, and dissolved chemical oxygen demand (SCOD) dissolution after the pretreatment. The optimum alkaline pretreatment conditions were 0.30 g NaOH (g VS), with a reaction time of 48 h. The experimental results show that when comparing the total VFA (TVFA) yields from the alkaline-pretreated risk husk with those from the untreated rice husk, over 14 d and 2 d, the maximum value reached 1237.7 and 716.0 mg·L with acetic acid and propionic acid and with acetic acid and butyric acid, respectively. After the alkaline pretreatment, TVFAs increased by 72.9%; VFA accumulation grew over time. The study found that alkaline pretreatment can improve VFA yields from rice husks and transform butyric acid fermentation into propionic acid fermentation. The study results can provide guidelines to support the comprehensive utilization of rice husk and waste treatment.
本研究探讨了利用碱性预处理来提高稻壳水解以生产挥发性脂肪酸（VFA）的方法。该研究考察了试剂浓度和预处理时间对预处理后蛋白质、碳水化合物以及溶解性化学需氧量（SCOD）溶解情况的影响。最佳碱性预处理条件为0.30克氢氧化钠/克挥发性固体（g NaOH/g VS），反应时间为48小时。实验结果表明，将经碱性预处理的稻壳与未处理的稻壳在14天和2天内产生的总挥发性脂肪酸（TVFA）产量进行比较时，以乙酸和丙酸以及以乙酸和丁酸计，最大值分别达到1237.7毫克/升和716.0毫克/升。经过碱性预处理后，TVFAs增加了72.9%；VFA积累量随时间增长。该研究发现碱性预处理可提高稻壳的VFA产量，并将丁酸发酵转变为丙酸发酵。研究结果可为支持稻壳的综合利用和废物处理提供指导。
