Utilization of sludge from Biyagama common wastewater treatment plant as fertilizer and soil conditioner in Sri Lanka
The main objective of the current study is to ascertain whether the sludge produced from the common wastewater treatment plant (CWWTP) at Biyagama Export Processing Zone (BEPZ) can be used as fertilizer and soil conditioner in Sri Lankan. In order to fulfil above objective the physicochemical and mi...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
2011
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| Subjects: | |
| Online Access: | https://repository.li.mahidol.ac.th/handle/123456789/48074 |
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| Institution: | Mahidol University |
| Language: | English |
| Summary: | The main objective of the current study is to ascertain whether the sludge produced from the common wastewater treatment plant (CWWTP) at Biyagama Export Processing Zone (BEPZ) can be used as fertilizer and soil conditioner in Sri Lankan. In order to fulfil above objective the physicochemical and microbiological properties of sludge were determined. Seed germination and root elongation tests were also carried out with Chinese flowering cabbage and Chinese cabbage seeds. The findings of this study showed that there are sufficient amounts of N (3.42%) and CaO(3.37%) in the sludge. However, P2O5 (0.32%), K2O (0.14%) and MgO (0.19%) contents are not sufficient for sludge to be used as fertilizer. Therefore, the sludge from BEPZ CWWTP is more suitable as soil conditioner than fertilizer if other parameters are complied with compost standards. The high content of Zn inhibited sludge for use as fertilizer and soil conditioner. Hence, the study recommends that further treatment is required to reduce heavy metals to acceptable levels prior to using sludge as fertilizer and soil conditioner. This study recommends co-composting for further study as a further treatment process. |
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