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Production of Bio-Energy from Pig Manure: A Focus on the Dynamics Change of Four Parameters under Sunlight-Dark Conditions.

Yin D, Liu W, Zhai N, Feng Y, Yang G, Wang X, Han X - PLoS ONE (2015)

Bottom Line: Two sets of experiments were conducted with a temperature of 35.0±2.0 °C and a total solid concentration of 8.0% to the digestion material.PM1 obtained higher CBP (15020.0 mL) with a more stable pH and a lower TAN concentration (1414.5 mg/L) compared to PM2 (2675.0 mL and 1670.0 mg/L, respectively).The direct path coefficients and indirect path coefficients between the four parameters and CBP were also analyzed.

View Article: PubMed Central - PubMed

Affiliation: College of Forestry and the Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.

ABSTRACT
This study investigated the effect of sunlight-dark conditions on volatile fatty acids (VFAs), total ammonium nitrogen (TAN), total alkalinity (TA) and pH during pig manure (PM) digestion and then the subsequent influence on biogas yield of PM. PM1 and PM2 were performed in a transparent reactor and a non-transparent reactor, respectively. Two sets of experiments were conducted with a temperature of 35.0±2.0 °C and a total solid concentration of 8.0% to the digestion material. The dynamic change of the four parameters in response to sunlight-dark conditions resulted in variations of the physiological properties in the digester and affected the cumulative biogas production (CBP). PM1 obtained higher CBP (15020.0 mL) with a more stable pH and a lower TAN concentration (1414.5 mg/L) compared to PM2 (2675.0 mL and 1670.0 mg/L, respectively). The direct path coefficients and indirect path coefficients between the four parameters and CBP were also analyzed.

No MeSH data available.


Related in: MedlinePlus

The dynamic changes of TAN (a) and TA (b) of PM1 and PM2.
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pone.0126616.g006: The dynamic changes of TAN (a) and TA (b) of PM1 and PM2.

Mentions: Fig 6(a) shows dynamic changes of TAN in PM1 and PM2. The average amount of TAN in PM1 (1385.0 mg/L) was lower than that in PM2 (1665.1 mg/L). The value of TAN in PM1 increased from 1289.5 mg/L to 1397.2 mg/L and then experienced a slight declined to 1214.1 mg/L on the 22nd day, when the value rebounded and reached a peak of 1602.7 mg/L on the 43rd day. In contrast, PM2 had a faster increasing rate of TAN compared to PM1 during the first 22 days, increasing from 1367.8 mg/L to a peak value of 1866.5 mg/L, which exceeded the range of 1500.0 mg/L, and the pH reached 7.6. Thus, the biogas production of PM2 (2675.0 mL) was significantly less than that of PM1 (15020.0 mL). The same conclusion was reported on Calli et al. who suggested that ammonia inhibition usually occurs when the pH is above 7.4 and TAN is within the range of 1500.0 mg/L to 3000.0 mg/L [35].


Production of Bio-Energy from Pig Manure: A Focus on the Dynamics Change of Four Parameters under Sunlight-Dark Conditions.

Yin D, Liu W, Zhai N, Feng Y, Yang G, Wang X, Han X - PLoS ONE (2015)

The dynamic changes of TAN (a) and TA (b) of PM1 and PM2.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4430234&req=5

pone.0126616.g006: The dynamic changes of TAN (a) and TA (b) of PM1 and PM2.
Mentions: Fig 6(a) shows dynamic changes of TAN in PM1 and PM2. The average amount of TAN in PM1 (1385.0 mg/L) was lower than that in PM2 (1665.1 mg/L). The value of TAN in PM1 increased from 1289.5 mg/L to 1397.2 mg/L and then experienced a slight declined to 1214.1 mg/L on the 22nd day, when the value rebounded and reached a peak of 1602.7 mg/L on the 43rd day. In contrast, PM2 had a faster increasing rate of TAN compared to PM1 during the first 22 days, increasing from 1367.8 mg/L to a peak value of 1866.5 mg/L, which exceeded the range of 1500.0 mg/L, and the pH reached 7.6. Thus, the biogas production of PM2 (2675.0 mL) was significantly less than that of PM1 (15020.0 mL). The same conclusion was reported on Calli et al. who suggested that ammonia inhibition usually occurs when the pH is above 7.4 and TAN is within the range of 1500.0 mg/L to 3000.0 mg/L [35].

Bottom Line: Two sets of experiments were conducted with a temperature of 35.0±2.0 °C and a total solid concentration of 8.0% to the digestion material.PM1 obtained higher CBP (15020.0 mL) with a more stable pH and a lower TAN concentration (1414.5 mg/L) compared to PM2 (2675.0 mL and 1670.0 mg/L, respectively).The direct path coefficients and indirect path coefficients between the four parameters and CBP were also analyzed.

View Article: PubMed Central - PubMed

Affiliation: College of Forestry and the Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.

ABSTRACT
This study investigated the effect of sunlight-dark conditions on volatile fatty acids (VFAs), total ammonium nitrogen (TAN), total alkalinity (TA) and pH during pig manure (PM) digestion and then the subsequent influence on biogas yield of PM. PM1 and PM2 were performed in a transparent reactor and a non-transparent reactor, respectively. Two sets of experiments were conducted with a temperature of 35.0±2.0 °C and a total solid concentration of 8.0% to the digestion material. The dynamic change of the four parameters in response to sunlight-dark conditions resulted in variations of the physiological properties in the digester and affected the cumulative biogas production (CBP). PM1 obtained higher CBP (15020.0 mL) with a more stable pH and a lower TAN concentration (1414.5 mg/L) compared to PM2 (2675.0 mL and 1670.0 mg/L, respectively). The direct path coefficients and indirect path coefficients between the four parameters and CBP were also analyzed.

No MeSH data available.


Related in: MedlinePlus