Effects of Co-Substrates and Mixing Ratio on the Anaerobic Digestion of Navel Orange Waste

Abstract:

The Gannan region is the largest navel orange planting area in the world and has the largest production in China. However, about 5 million tons of navel orange waste (NOW) produced annually. NOW has a great environmental risk because of its high content of organic matter and moisture. Anaerobic digestion of NOW with high nitrogen content waste is a promising alternative to treat these wastes. The effect of swine manure (SM), waste active sludge (WAS) as co-substrates and different mixing ratio were examined in three batch-scale studies. In the first investigation, co-digestion of NOW with SM resulted low methane yield and high concentration of VFAs. In the second investigation, NOW was co-digested with WAS, the methane yield was improved by 260% when the mixing ratio of NOW to WAS (VS/VS) was shifted from 1:2 to 2:1. In the third investigation, the co-digestion of NOW with SM and WAS was conducted. Co-digestion of three substrates has higher methane yield than that of previous two studies, with the exception of equal amounts of NOW with co-substrates (mixing ratio of NOW to SM to WAS was 2:1:1). The highest methane yield of all experiments was 0.20 m³ kg^-1VS added while the mixing ratio of NOW to SM to WAS was 1:2:1. It seemed to obtain stable digestion performance, the mixing ratio of co-substates to NOW should not be lower than 1:1. WAS was a better co-substrate than SM, as WAS was capable to supply more organic nitrogen to create positive synergistic effects.

• Periodical: Advanced Materials Research (Volume 878)
• Pages: 473-480
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.878.473
• Online since: January 2014
• Authors: Jin Rong Qiu, Yun Long Fu, Qing Yun Liu, Shun Yi Li, Hai Jun Peng, Zhi Hua Pang, Zhen Cheng Xu
• Keywords: Anerobic Digestion, Co-Substrates, Mixing Ratio, Waste Navel Orange

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