Effect of Australian zeolite on methane production and ammonium removal during anaerobic digestion of swine manure

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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Methane Production in Batch Anaerobic Digestion of Livestock Manures with Different Substrate Concentrations

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i4.38.27879 ◽

2018 ◽

Vol 7 (4.38) ◽

pp. 1380

Author(s):

Supawadee Yodthongdee ◽

Panomchai Weerayutsil ◽

Kulyakorn Khuanmar

Keyword(s):

Anaerobic Digestion ◽

Methane Production ◽

Swine Manure ◽

Dairy Manure ◽

Raw Material ◽

Chicken Manure ◽

Total Solids ◽

Solids Concentration ◽

Working Volume ◽

The Individual

This research aimed to evaluate the biochemical methane potential (BMP) of three livestock manures including swine manure (SM), chicken manure (CM), and dairy manure (DM) under the same conditions in batch anaerobic digestion (AD) including inoculum to substrate ratio, temperature, digestion time, concentration of total solids in the system, and reactor size. The experiments were performed on individual manure, 2-manure mixture, and 3-manure mixture. For the individual manure experiments, BMP of SM, CM, and DM were 326.97, 306.60, and 105.30 mL/gVSadded; and volatile solids (VS) removal values were 66.31, 62.47, and 52.02%, respectively. In the 2-manure mixture; SM: DM, SM: CM, and CM: DM ratios of 90:10%TS, the BMP were 278.15, 264.47, and 252.80 mL/gVSadded, respectively. In the 3-manure mixture, the maximum BMP was 200.82 mL/gVSadded under the SM: CM: DM combination of 74:20:6%TS. The conditions of the 3 experiments were similar: the total solids concentration at 20% of working volume and the temperature of 37°C. It could be concluded that each manure i.e., SM, CM, and DM could be used as raw material for methane production by anaerobic digestion. SM generated the highest BMP, followed by CM and DM, respectively. However, DM should not be used as raw material alone, except combining it with SM or CM for better methane production.

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