Alleviation of ammonia inhibition via nano-bubble water supplementation during anaerobic digestion of ammonia-rich swine manure: Buffering capacity promotion and methane production enhancement

Abstract Poultry manure is an ammonia-rich substrate that inhibits methanogenesis, causing severe problems to the anaerobic digestion process. In this study, the effect of different natural zeolite concentrations on the mesophilic anaerobic digestion of poultry waste inoculated with well-digested swine manure was investigated. A significant increase in methane production was observed in treatments where zeolite was added, compared to the treatment without zeolite.Methane production in the treatment with 10 g dm-3 of natural zeolite was found to be 109.75% higher compared to the treatment without zeolite addition. The results appear to be influenced by the addition of zeolite, which reduces ammonia toxicity in anaerobic digestion and by the ammonia-tolerant swine inoculum.

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Improved methane production from anaerobic digestion of liquid and raw fractions of swine manure effluent using activated carbon

Journal of Water Process Engineering ◽

10.1016/j.jwpe.2020.101576 ◽

2020 ◽

Vol 38 ◽

pp. 101576 ◽

Cited By ~ 1

Author(s):

Ruby M. Romero ◽

Edgardo I. Valenzuela ◽

Francisco J. Cervantes ◽

Refugio B. Garcia-Reyes ◽

Denisse Serrano ◽

...

Keyword(s):

Activated Carbon ◽

Anaerobic Digestion ◽

Methane Production ◽

Swine Manure

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Effects of Lighter Dose of Oxytetracycline on the Accumulation and Degradation of Volatile Fatty Acids in the Process of Thermophilic Anaerobic Digestion of Swine Manure

Sustainability ◽

10.3390/su13074014 ◽

2021 ◽

Vol 13 (7) ◽

pp. 4014

Author(s):

Zijing Fan ◽

Mei Zhang ◽

Xiaxia Chen ◽

Zhongda Hu ◽

Qihang Shu ◽

...

Keyword(s):

Anaerobic Digestion ◽

Methane Production ◽

Volatile Fatty Acids ◽

Respiratory Infections ◽

Swine Manure ◽

Inhibitory Effect ◽

Farm Animals ◽

Original Form ◽

Livestock Farming ◽

Thermophilic Anaerobic Digestion

Oxytetracycline (OTC) is a commonly used antibiotic in livestock farming for controlling intestinal and respiratory infections in farm animals. However, the absorption of antibiotics by animals is limited, and most antibiotics are excreted in the original form with manure, which will have an impact on the environment. The removal of antibiotics from swine manure could generally be performed via anaerobic digestion (AD). In this study, the effect of oxytetracycline (OTC) at doses of 0.1, 0.5, and 1.0 mg/L on the thermophilic anaerobic digestion of swine manure (55 °C) in batch digesters was studied. The methane production, volatile fatty acid (VFA) levels, and dissolved organic matter (DOM) were determined and compared with the control (0 mg/L of OTC). The results indicate that (1) OTC at 0.1 mg/L had no inhibitory effect on methane production or on the accumulation of VFAs, while 0.5 mg/L and 1.0 mg/L inhibited methane production, with inhibition rates of 4.03% and 14.12% (p < 0.05), respectively; (2) the VFAs of each reactor peaked on the first day of the reaction, and as the OTC dose increased from 0 to 1.0 mg/L, the maximum VFA accumulation increased from 1346.94 mg/g to 2370 mg/g of volatile solids (VS); and (3) oxytetracycline (0.5 and 1.0 mg/L) could promote the temporary accumulation of propionic acid, which did, however, not result in significant VFA accumulation. Further, OTC at 1.0 mg/L can promote DOM production, and therefore, VFA accumulation.

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