Enhanced efficiency of an anaerobic reactor containing sepiolite or biochar for treatment swine wastewater
SU Cheng-yuan1,2, ZHENG Peng2, LU Yu-xiang2, XIE Lian2, HUANG Chun-ping2, HUANG Zhi2, CHEN Meng-lin2
1. Key Laboratory of Karst Ecology and Environment Change of Guangxi Department of Education, Guilin 541004, China;
2. School of Environment and Resources, Guangxi Normal University, Guilin 541004, China
In this study, the enhanced efficiency of an anaerobic reactor containing sepiolite and biochar for treatment swine wastewater was investigated, respectively. The impacts of sepiolite and biochar on the components of soluble microbial products (SMP) and extracellular polymeric substances (EPS) of anaerobic sludge were also evaluated using excitation-emission matrix (EEM) and fourier transform infrared (FTIR) spectra. The results showed that the anaerobic reactor containing sepiolite or biochar could improve the removal of both COD and ammonia nitrogen. Using sepiolite and biochar, the average removal rate of COD increased by 10.1% and 15.4%, respectively. Meanwhile, the maximal removal efficiency of ammonia nitrogen reached to 50.9% and 71.5%, respectively. With regard to the SMP of the sludge, the absorption peaks at 2930cm-1, 1460cm-1 abated in the FTIR spectra. It was indicated that sepiolite effectively removed great molecule organic substances in the swine wastewater. On the other hand, the intensity of the absorption peak of fulvic acid-like (Ex/Em=340nm/420nm) was reduced in the EEM spectra using biochar. It was demonstrated that biochar improved the quality of the reactor effluent. In terms of the EPS of the sludge, the intensity of the absorption peaks of protein-like (Ex/Em=225nm/340nm) and tryptophan PN-like (Ex/Em=340nm/420nm) increased in the EEM spectra containing biochar. It was denoted that the augment of the protein content was in favour of the anaerobic granular sludge flocculation. Besides, the absorption peak of coenzyme F420 (Ex/Em=420nm/470nm) also appeared in the EEM spectra. It was illustrated that the activity of methanogens in the anaerobic reactor was intensified, which ensured the enhanced efficiency of the anaerobic reactor for treatment swine wastewater.
Chen Y, Cheng J J, Creamer K S. Inhibition of anaerobic digestion process:A review[J]. Bioresource Technology, 2008,99:4044-4064.
[7]
Wu D L, Zheng S S, Ding A Q, et al. Performance of a zero valent iron-based anaerobic system in swine wastewater treatment[J]. Journal of Hazardous Materials, 2015,286:1-6.
Gao Y Y, Gan H H, Zhang G K, et al. Visible light assisted Fenton-like degradation of rhodamine B and 4-nitrophenol solutions with a stable poly-hydroxyl-iron/sepiolite catalyst[J]. Chemical Engineering Journal, 2013,217:221-230.
Wang Q H, Yang Y N, Yu C, et al. Study on a fixed zeolite bioreactor for anaerobic digestion of ammonium-rich swine wastes[J]. Bioresource Technology, 2011,102:7064-7068.
[13]
Zheng H Y, Li D W, Stanislaus M S, et al. Development of a bio-zeolite fixed-bed bioreactor for mitigating ammonia inhibition of anaerobic digestion with extremely high ammonium concentration livestock waste[J]. Chemical Engineering Journal, 2015,280:106-114.
[14]
Zhang D Q, Trzcinski A P, Kunacheva C, et al. Characterization of soluble microbial products (SMPs) in a membrane bioreactor (MBR) treating synthetic wastewater containing pharmaceutical compounds[J]. Water Research, 2016,102:594-606.
[15]
Su C Y, Li W G, Lu Y X, et al. Effect of heterogeneous Fentonlike pre-treatment on anaerobic granular sludge performance and microbial community for the treatment of traditional Chinese medicine wastewater[J]. Journal of Hazardous Materials, 2016, 314:51-58.
[16]
Sun J, Guo L, Li Q Q, et al. Structural and functional properties of organic matters in extracellular polymeric substances (EPS) and dissolved organic matters (DOM) after heat pretreatment with waste sludge[J]. Bioresource Technology, 2016,219:614-623.
[17]
Li K, Wei D, Zhang G, et al. Toxicity of bisphenol A to aerobic granular sludge in sequencing batch reactors[J]. Journal of Molecular Liquids, 2015,209:284-288.
[18]
Luo C H, Lu F, Shao L M, et al. Application of eco-compatible biochar in anaerobic digestion to relieve acid stress and promote the selective colonization of functional microbes[J]. Water Research, 2015,68:710-718.
Montalvo S, Martin J S, Huilinir C, et al. Assessment of a UASB reactor with high ammonia concentrations:Effect of zeolite addition on process performance[J]. Process Biochemistry, 2014,49:2220-2227.
Li K, Wei D, Yan T, et al. Responses of soluble microbial products and extracellular polymeric substances to the presence of toxic 2,6-dichlorophenol in aerobic granular sludge system[J]. Journal of Environmental Management, 2016,183:594-600.
[24]
Zhang W J, Cao B D, Wang D S, et al. Influence of wastewater sludge treatment using combined peroxyacetic acid oxidation and inorganic coagulants re-flocculation on characteristics of extracellular polymeric substances (EPS)[J]. Water Research, 2016,88:728-739.
Dong F, Zhao Q B, Zhao J B, et al. Monitoring the restart-up of an upflow anaerobic sludge blanket (UASB) reactor for the treatment of a soybean processing wastewater[J]. Bioresource Technology, 2010,101:1722-1726.
