Optimization of biogas production using water hyacinth (Eichhornia crassipes. L.) and dairy cattle (Bos primigenius taurus) manure in an improvised digester.

Date

4-2013

Degree

Bachelor of Science in Agricultural Engineering

Major Course

Major in Agricultural and Bio-Process Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Casas, Edgardo V.

Committee Member

Elauria, Jessie C.

Abstract

The optimization of biogas production using water hyacinth (Eichhoniacrassipes. L) and dairy cattle (Bosprimigenius taurus) manure in an improvised digester was conducted. The effects of the three independent parameters namely, dairy cattle manure to water hyacinth ratio (1:3, 1:1, and 3:1), temperature(30ºC, 35ºC and 40ºC) and solid to liquid ratio (1:1, 1:2, and 1:3) on the volume of biogas produced were investigated. Significant effects of both the individual and combined effects of the independent parameters on biogas production were determined using Analysis of Variance (ANOVA) and Effects Estimate Analysis. The optimum conditions for biogas production, on the other hand, were determined using Response Surface Regression of STATISTICA 7. Based on the determined optimum conditions, a model was generated using CurveExpert 1.4. Results showed that the optimum conditions for biogas production using water hyacinth and dairy cattle manure were 3:1 dairy cattle manure to water hyacinth ratio, 1:1 solid to liquid ratio and 35ºC operating temperature. Results of the ANOVA analysis, on the other hand, showed that the individual independent parameters do not have significant effects on the biogas production. However, the combined effects of temperature and solid to liquid ratio were proven to significantly affect biogas production. Using the optimum conditions, Response Surface Regression was able to predict that biogas production would be at its peak in the 40ᵗʰ day having a total gas production f 246 cm³. Moreover, based on the optimum conditions, the Quadratic Model of the CurveExpert 1.4 generated the equation of best fit curve that described the cumulative biogas production having R²=0.7665. The equation established was y=a=bx=cx² , where x is the number of days and a, b, and c are constants with respective values of-1.1805, 4.7132 and -9.1728. Result of the replication run was able to confirm the results of the preceding run. The curve generated also best fitted the Quadratic model of the CurveExpert 1.4. The established equation was y=a=bx=bx² where a, b, and c are-2.0385, 1.1307, and -2.3225 respectively the R² value was

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology

Call Number

LG 993.5 2013 A2 O47

Document Type

Thesis

This document is currently not available here.

Share

COinS