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Environmental Engineering. 2021, (04) Core

EFFECTS OF PRETREATMENTS AND SUBSTRATE COMPOSITIONS ON ANAEROBIC DIGESTION OF ORGANIC WASTEChinese Full TextEnglish Full Text (MT)

XU Yi-wen;YANG Guo-dong;WANG Feng-xia;CHEN Hui-ting;HUANG Ai-lian;LIU Li-ting;JIANG Yan-hang;SONG Ying-chun;JIANG Jian-guo;School of Environment,Tsinghua University;City Appearance and Environmental Management Center of Baoan District,Shenzhen;

Abstract: With the implementation of waste sorting policy in China, efficient utilization of organic waste becomes a great challenge in China. In this paper, continuous experiments on anaerobic digestions of kitchen waste, fruit and vegetable waste and garden waste were conducted, while ultrasound and alkali-thermal pretreatment were applied to enhance methane production, with the mono-digestion of food waste served as the control. According to different OLRs, the reaction period was divided into low OLR phase [OLR=1, 2 g/（L·d）] and high OLR phase [OLR=4, 6 g/（L·d）]. The results showed that under low OLR, all reaction systems showed strong stability, among which, kitchen waste had the highest VS removal rate of 90.3% and methane yield of 460 mL/g. Besides, after ultrasonic pretreatment and alkali-thermal pretreatment, the methane yields of co-substrates were increased by 7%～8% and 3%～7%, respectively. Under high organic load, the stability of mono-digestion system was significantly reduced, specifically, the pH value was decreased to 6.70 and the concentration of VFA and TAN was accumulated to 1230, 1519 mg/L, while the VS removal rate and methane yield were reduced by 2.8% and 11% as well. However, the co-digestion systems showed stronger resistance to high OLRs. Compared with kitchen waste, the methane yield of co-substrate was increased to 420 mL/g. After ultrasonic pretreatment, the methane yield was further increased by 3%, while the methane yield after alkali-thermal pretreatment was decreased by 4%.
Keywords：

kitchen waste; fruit and vegetable waste; garden waste; anaerobic co-digestion; pretreatment;

  • DOI：

    10.13205/j.hjgc.202104016

  • Series：

    (B) Chemistry/ Metallurgy/ Environment/ Mine Industry

  • Subject：

    Organic Chemical Industry; General Chemistry Industry; Environment Science and Resources Utilization

  • Classification Code：

    TQ920.6;X799.3;TQ221.11

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