Abstract
Sugarcane leaves (SL) pretreated by alkali was used as substrate to enhance biogas production via mesophilic anaerobic digestion (AD) in this study. Effectiveness of different concentrations of NaOH pretreatment on AD performance was investigated. Results showed that compared to untreated sample of SL, the lignocellulose (LCH) content of NaOH pretreated group was decreased by 5.79%-16.85%. However, the cumulative biogas production of the pretreated samples increased in the range of 34.54%-82.67%; moreover, T90 was shorten by 5-7 d. The highest anaerobic digestibility of SL was achieved at 6% NaOH pretreatment, which produced 287.30 mL/g TS of biogas. A significant interactive effect of the three parameters (temperature, SL/manure mixing ratio and C/N ratio) was found on the biogasification of anaerobic co-digestion, and a maximum biogas production was achieved at 36.2oC, mixing ratio of 1.6 and C/N ratio of 29.2. These show that the verification experiment confirmed the optimization results. This study provides meaningful insight for exploring efficient pretreatment strategy and optimal condition to stabilize and enhance AD performance for practical application. Keywords: NaOH pretreatment, co-digestion, sugarcane leaves, pig manure, dairy manure DOI: 10.25165/j.ijabe.20181104.4079 Citation: Luo J, Meng H B, Yao Z L, Wachemo A C, Yuan H R, Zhang L, et al. Anaerobic co-digestion of sodium hydroxide pretreated sugarcane leaves with pig manure and dairy manure. Int J Agric & Biol Eng, 2018; 11(4): 224-229.
Highlights
Sugarcane is one of the main sugar crops cultivated in China, accounts more than 85% of perennial planting area for sugar crops
The pig manure (PM) and dairy manure (DM) were collected from Daxing District, Beijing and stored at 20oC in a refrigerator until used for anaerobic digestion (AD) tests
The anaerobic sludge used as inoculum was collected from a 50 L mesophilic anaerobic digester in the laboratory of Chinese Academy of Agricultural Engineering (CAAE)
Summary
Sugarcane is one of the main sugar crops cultivated in China, accounts more than 85% of perennial planting area for sugar crops. The yield of sugarcane in China is over 116.97 million t in 2015 (National Bureau of Statistics of China, 2016), producing huge amount of SL as agricultural byproduct, which is believed to be rich in organic matter. More than 80% of the SL production remains unused and causes serious environmental and safety problems due to burning operations in open air. China is commonly known in major animal husbandry. According to the pilot programs to promote the utilization of agricultural waste resource, the annual yield of livestock and poultry manure production were over 3.8 billion tons[1], but the comprehensive utilization rate is less than 60% in 2016. That means at least 1.52 billion tons of animal manure has not been used effectively, which could cause serious environmental pollution[2]
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