Effective bioconversion of sewage treatment plant sludge by pure bacterial culture: an optimization study
to evaluate the effective and efficient bioconversion through the process conditions. A 2-level full factorial (24 ) design with four central points was conducted with the aim of optimization of processes conditions such as temperature, agitation, pH and inoculum for the bioconversion of STP slud...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Malaysia Association
2020
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/80902/ http://irep.iium.edu.my/80902/1/80902_Effective%20Bioconversion%20of%20Sewage%20Treatment.pdf |
| Summary: | to evaluate the effective and efficient bioconversion through the process conditions. A 2-level full
factorial (24
) design with four central points was conducted with the aim of optimization of processes
conditions such as temperature, agitation, pH and inoculum for the bioconversion of STP sludge through
chemical oxygen demand (COD) removal (response). A second order polynomial model was developed
to represent the removal of COD with the variation of different process conditions in the sludge
treatment. Analysis of variance (ANOVA) of full factorial design showed a high coefficient of
determination (R2
) of 0.90 indicating a satisfactory adjustment of the model with the experimental data.
The linear and interaction effects among the factors were identified through the p- and t-test. Statistical
analysis showed that the agitation and inoculum size have significant effects (p<0.05) on bioconversion
of STP sludge (COD removal). The results with the surface response analysis indicated the optimum
values of parameters with the minimum content of COD (30 mg/L): temperature, 40℃; agitation, 50
rpm; pH, 3; inoculum, 5% (v/v). |
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