Enhanced syntrophic metabolism of propionate and butyrate via nickel-containing activated carbon during anaerobic digest
- PDF / 4,137,263 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 58 Downloads / 183 Views
ORIGINAL ARTICLE
Enhanced syntrophic metabolism of propionate and butyrate via nickel‑containing activated carbon during anaerobic digestion Ning Wang1 · Tugui Yuan1 · Jae Hac Ko2 · Xiaoyu Shi1 · Qiyong Xu1 Received: 31 December 2019 / Accepted: 14 April 2020 © Springer Japan KK, part of Springer Nature 2020
Abstract The accumulation of volatile fatty acids (VFAs) is commonly occur during anaerobic digestion, affecting methane production rate and system stability. Batch experiments were conducted to investigate the effects of nickel-containing granular activated carbon (GAC-Ni), an industrial waste, on the degradation of acetate (HAc), propionate (HPr) and butyrate (HBu), respectively. The results showed that the maximum methane production rate of the reactors fed with HPr and HBu were increased by 54.06% and 16.55%, respectively, with the supplementation of GAC-Ni. Correspondingly, the degradation rates of HPr and HBu were improved with GAC-Ni addition, which was 1.14–20.70 times and 1.01–2.16 times of the control, respectively. And the microbial analysis revealed that GAC-Ni facilitated the syntrophic relationship between Syntrophomonas and hydrogenotrophic methanogens (i.e. genera Methanolinea and Methanobacterium), leading to faster degradation of HPr and HBu. Additionally, the surface morphology analysis indicated that the presence of Ni in GAC-Ni could promote the formation of condense reticulate structures, which might be beneficial for linking the functional microbes together. This study suggested that GAC-Ni waste could mitigate the accumulation of VFAs in anaerobic digestion reactor by promoting the syntrophic metabolism between VFAs degradation bacteria and methanogens.
* Qiyong Xu [email protected] 1
Shenzhen Engineering Laboratory for Eco‑Efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, People’s Republic of China
Department of Environmental Engineering, College of Ocean Sciences, Jeju National University, Jeju Special Self-Governing Province, Jeju 63243, Republic of Korea
2
13
Vol.:(0123456789)
Journal of Material Cycles and Waste Management
Graphic abstract
Keywords Anaerobic digestion · Volatile fatty acids · Activated carbon · Methane · Syntrophic metabolism
Introduction Anaerobic digestion (AD) is frequently considered as a feasible approach to treat organic wastes such as food waste, industrial wastewater, sludge, etc.[1–3]. However, volatile fatty acids (VFAs) accumulation is a common thorny issue for the AD process [4, 5]. The accumulation of VFAs causes a sharp drop in pH, which could inhibit the activity of methanogens and thus resulting in low methane (CH4) production rate and process instability [6–8]. Acetate (HAc), propionate (HPr) and butyrate (HBu) constitute the major components of VFAs [4, 5]. HPr and HBu were more difficult to be degraded as compared to HAc since they cannot be utilized directly by the methanogens [7, 9]. HPr and HBu have to
Data Loading...
