摘要
奇数碳挥发性脂肪酸(OCFA)作为厌氧消化过程的中间代谢产物,是合成聚羟基烷酸(PHAs)和生物脱氮除磷(BNR)的优质碳源。为了提高OCFA在泔脚废油脂厌氧发酵液中的占比,研究了含油量对其厌氧发酵定向生产OCFA的影响。以废弃肥肉代表的脂类为发酵底物,泔水浮油和煎炸废油为添加物,厌氧池末端的剩余污泥为接种物,探讨了在含油量为0~20 g/L的情况下挥发性脂肪酸(VFAs)浓度和OCFA占比(OCFA/VFAs)的变化规律,以及对发酵过程中溶解性化学需氧量(SCOD)、溶解性蛋白质、多糖等的影响。结果表明,当含油量为10 g/L时,VFAs浓度和OCFA最高占比均有所提高,相较于含油量为0 g/L时,分别提高了57.6%、5.9%。且通过响应面法确定最佳发酵工况为发酵时间=7.6 d和含油量=11.2 g/L,OCFA占比最高可达73.5%。
The odd carbon volatile fatty acids(OCFA),as intermediate metabolites in anaerobic digestion,are important carbon sources for the synthesis of polyhydroxyalkanoates(PHAs)and biological nutrients removal(BNR).To increase the proportion of OCFA in the anaerobic fermentation broth of hogwash waste grease,the effect of oil content in hogwash waste grease on the directional production of OCFA by anaerobic fermentation was studied.The changes of volatile fatty acid(VFAs)concentration and OCFA proportion(OCFA/VFAs)and their effects on dissolved chemical oxygen demand(SCOD),soluble protein and polysaccharides during fermentation were studied with waste fat in hogwash waste grease as fermentation substrate,slops oil slick and frying waste oil as additives,and excess sludge at the end of the anaerobic tank as inoculum.The changes of VFAs concentration and OCFA proportion(OCFA/VFAs)in the case of oil content 0-20 g/L were discussed respectively.The results showed that when the oil content was 10 g/L,the VFAs concentration and the highest proportion of OCFA were increased,compared with the oil content of 0 g/L,increased by 57.6%and 5.9%respectively.And the best fermentation conditions were determined by response surface method that fermentation time was 7.6 days,oil content was 11.2 g/L,and the highest proportion of OCFA was 73.5%.
作者
罗锦
方茜
曾蕴仪
韦童
LUO Jin;FANG Qian;ZENG Yun-yi;WEI Tong(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2021年第3期24-31,共8页
China Water & Wastewater
基金
国家自然科学基金资助项目(21207023)
广东省自然科学基金资助项目(2017A030313273)。
关键词
含油量
奇数碳挥发性脂肪酸
泔脚废油脂
厌氧发酵
oil content
odd carbon volatile fatty acid(OCFA)
hogwash waste grease
anaerobic fermentation
