Optimization of process conditions for citric acid production utilizing STP sludge as substrate by liquid state bioconversion
Citric acid was produced by Aspergillus niger A-SS106 isolated from local sources utilizing sewage treatment plant (STP) sludge as substrate in laboratory scale process. Central composite design (CCD) was carried out to identify the total experiments for optimization of process conditions for citric...
| Main Authors: | , , |
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| Format: | Proceeding Paper |
| Language: | English |
| Published: |
2006
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| Online Access: | http://irep.iium.edu.my/5846/ http://irep.iium.edu.my/5846/1/Full-text_UTM.pdf |
| _version_ | 1848776574360354816 |
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| author | Alam, Md. Zahangir Jamal, Parveen Saari, Rosnani |
| author_facet | Alam, Md. Zahangir Jamal, Parveen Saari, Rosnani |
| author_sort | Alam, Md. Zahangir |
| building | IIUM Repository |
| collection | Online Access |
| description | Citric acid was produced by Aspergillus niger A-SS106 isolated from local sources utilizing sewage treatment plant (STP) sludge as substrate in laboratory scale process. Central composite design (CCD) was carried out to identify the total experiments for optimization of process conditions for citric acid production. The variables involved in the study were temperature, agitation rate, initial pH and inoculum size. A polynomial model was developed using the experimental data for determining the optimum process conditions through response surface methodology with respect to citric acid production. Statistical analysis of results showed the optimized values were: temperature of 30 ºC, agitation rate of 350 rpm, initial pH of 4 and inoculum size of 2%. Under the optimum conditions obtained from model equation, the predicted citric acid was 1.51 g/l produced on day 4. The maximum citric acid was 2.9 g/l obtained on day 2 under the optimum conditions. |
| first_indexed | 2025-11-14T14:32:15Z |
| format | Proceeding Paper |
| id | iium-5846 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T14:32:15Z |
| publishDate | 2006 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-58462024-12-24T07:47:45Z http://irep.iium.edu.my/5846/ Optimization of process conditions for citric acid production utilizing STP sludge as substrate by liquid state bioconversion Alam, Md. Zahangir Jamal, Parveen Saari, Rosnani TP Chemical technology TP248.13 Biotechnology Citric acid was produced by Aspergillus niger A-SS106 isolated from local sources utilizing sewage treatment plant (STP) sludge as substrate in laboratory scale process. Central composite design (CCD) was carried out to identify the total experiments for optimization of process conditions for citric acid production. The variables involved in the study were temperature, agitation rate, initial pH and inoculum size. A polynomial model was developed using the experimental data for determining the optimum process conditions through response surface methodology with respect to citric acid production. Statistical analysis of results showed the optimized values were: temperature of 30 ºC, agitation rate of 350 rpm, initial pH of 4 and inoculum size of 2%. Under the optimum conditions obtained from model equation, the predicted citric acid was 1.51 g/l produced on day 4. The maximum citric acid was 2.9 g/l obtained on day 2 under the optimum conditions. 2006 Proceeding Paper PeerReviewed application/pdf en http://irep.iium.edu.my/5846/1/Full-text_UTM.pdf Alam, Md. Zahangir and Jamal, Parveen and Saari, Rosnani (2006) Optimization of process conditions for citric acid production utilizing STP sludge as substrate by liquid state bioconversion. In: Regional Postgraduate Conference on Science and Engineering, 27-28 July, 2006, UTM, Malaysia. |
| spellingShingle | TP Chemical technology TP248.13 Biotechnology Alam, Md. Zahangir Jamal, Parveen Saari, Rosnani Optimization of process conditions for citric acid production utilizing STP sludge as substrate by liquid state bioconversion |
| title | Optimization of process conditions for citric acid production utilizing STP sludge as substrate by liquid state bioconversion |
| title_full | Optimization of process conditions for citric acid production utilizing STP sludge as substrate by liquid state bioconversion |
| title_fullStr | Optimization of process conditions for citric acid production utilizing STP sludge as substrate by liquid state bioconversion |
| title_full_unstemmed | Optimization of process conditions for citric acid production utilizing STP sludge as substrate by liquid state bioconversion |
| title_short | Optimization of process conditions for citric acid production utilizing STP sludge as substrate by liquid state bioconversion |
| title_sort | optimization of process conditions for citric acid production utilizing stp sludge as substrate by liquid state bioconversion |
| topic | TP Chemical technology TP248.13 Biotechnology |
| url | http://irep.iium.edu.my/5846/ http://irep.iium.edu.my/5846/1/Full-text_UTM.pdf |