The anaerobic co-digestion of biomass waste, a promising process of reusing resources, is capable of improving methane production. However, the characteristics and composition of fermenting raw material negatively influence the efficiency of methane production. Optimization experiments were systematically performed in this study through anaerobic co-digestion with urea-ammoniated rice straw (UARS) and food waste (FW) as co-substrates. Anaerobic co-digestion of UARS and FW in biogas production under mesophilic conditions (35 °C) was investigated in a 1 L enclosed triangular flask with a total organic load of 6 g volatile solids (VS)/L. The optimal mixing ratio of UARS to FW was close to 1:3, and the methane yield increasing by 8.83% compared with the sole substrate. Furthermore, based on the optimization ratio, supplementation of cobalt (Co) and nickel (Ni) on co-digestion were significantly superior to that of a single element. Additionally, kinetic analysis indicated that trace element remarkably facilitated the reaction rate of co-digestion. Noteworthy, the addition of Co, Ni, and the combination of Co and Ni achieved very significant (p < 0.01) improvement of 6.45, 8.36, and 13.65%. Meanwhile, Ni was substantially promoted the removal rate of VS, enhanced the operational stability of co-digestion and increased the methane content significantly.
Anaerobic co-digestion Ammoniated rice straw Food waste Biogas production Trace element
This is a preview of subscription content, log in to check access.
The authors are grateful for the financial support provided by grants from the National Key Technology Research and Development Program (No. 2015BAD21B00-1-03) and Scientific Research Foundation for Returned Scholars, Heilongjiang Province (No. LC2016015).
Dong L, Liu SC, Li M, Li ZD, Yuan YX, Yan ZY, Liu XF (2015) Effects of feedstock ratio and organic loading rate on the anaerobic mesophilic co-digestion of rice straw and cow manure. Biores Technol 189:319–326. doi:10.1016/j.biortech.2015.03.040CrossRefGoogle Scholar
Demirel B, Göl NP, Onay TT (2013) Evaluation of heavy metal content in digestate from batch anaerobic co-digestion of sunflower hulls and poultry manure. J Mater Cycles Waste Manage 15(2):242–246. doi:10.1007/s10163-012-0107-4CrossRefGoogle Scholar
Song YC, Kwon SJ, Woo JH (2004) Mesophilic and thermophilic temperature co-phase anaerobic digestion compared with single-stage mesophilic- and thermophilic digestion of sewage sludge. Water Res 38(7):1653–1662. doi:10.1016/j.watres.2003.12.019CrossRefGoogle Scholar
Shen F, Yuan HR, Pang YZ, Chen SL, Zhu BN, Zou DX, Liu YP, Ma JW, Yu L, Li XJ (2013) Performances of anaerobic co-digestion of fruit and vegetable waste (FVW) and food waste (FW): single-phase vs. two-phase. Biores Technol 144:80–85. doi:10.1016/j.biortech.2013.06.099CrossRefGoogle Scholar
Ha DVD, Hoefman S, Boeckx P, Verstraete W, Boon N (2010) Copper enhances the activity and salt resistance of mixed methane-oxidizing communities. Appl Microbiol Biotechnol 87(6):2355–2363. doi:10.1007/s00253-010-2702-4CrossRefGoogle Scholar
Weiß S, Tauber M, Somitsch W, Meincke R, Müller H, Berg G, Guebitz GM (2010) Enhancement of biogas production by addition of hemicellulolytic bacteria immobilised on activated zeolite. Water Res 44(6):1970–1980. doi:10.1016/j.watres.2009.11.048CrossRefGoogle Scholar
Facchin V, Cavinato C, Fatone F, Pavan P, Cecchi F, Bolzonella D (2013) Effect of trace element supplementation on the mesophilic anaerobic digestion of foodwaste in batch trials: the influence of inoculum origin. Biochem Eng J 70(2):71–77. doi:10.1016/j.bej.2012.10.004CrossRefGoogle Scholar
Karlsson A, Einarsson P, Schnürer A, Sundberg C, Ejlertsson J, Svensson BH (2012) Impact of trace element addition on degradation efficiency of volatile fatty acids, oleic acid and phenyl acetate and on microbial populations in a biogas digester. J Biosci Bioeng 114(4):446–452. doi:10.1016/j.jbiosc.2012.05.010CrossRefGoogle Scholar
Jiang T, Schuchardt F, Li G, Guo R, Zhao YQ (2011) Effect of C/N ratio, aeration rate and moisture content on ammonia and greenhouse gas emission during the composting. J Environ Sci 23(10):1754–1760. doi:10.1016/S1001-0742(10)60591-8CrossRefGoogle Scholar
Li Jianghao, Zhang Ruihong, Siddhu Muhammad Abdul Hanan, He Yanfeng, Wang Wen, Li Yeqing, Chen Chang, Liu Guangqing (2015) Enhancing methane production of corn stover through a novel way: sequent pretreatment of potassium hydroxide and steam explosion. Biores Technol 181:345–350. doi:10.1016/j.biortech.2015.01.050CrossRefGoogle Scholar
Wang XJ, Yang GH, Feng YZ, Ren GX, Han XH (2012) Optimizing feeding composition and carbon-nitrogen ratios for improved methane yield during anaerobic co-digestion of dairy, chicken manure and wheat straw. Biores Technol 120:78–83. doi:10.1016/j.biortech.2012.06.058CrossRefGoogle Scholar