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| Content Provider | Springer Nature Link |
|---|---|
| Author | Chiu, Sam L. H. Lo, Irene M. C. Woon, Kok Sin Yan, Dickson Y. S. |
| Copyright Year | 2015 |
| Abstract | This study evaluates waste treatment scenarios involving the current waste treatment method (i.e., incineration) and two proposed technically feasible treatment methods (i.e., anaerobic digestion and co-digestion) for sewage sludge and food waste, with the consideration of environmental impacts and energy production performance. A sustainable waste treatment strategy is then identified through a combination of waste treatment methods with low environmental impacts and high energy production in Macau.This study applies life cycle assessment methodology. The selection of waste treatment methods is based on Macau’s situation (i.e., land scarcity and limited agricultural activities). Scenarios with different treatment methods are evaluated based on human health, ecosystems, and energy production performance. This study is divided into three parts. In part 1, three scenarios for treating sewage sludge and food waste are evaluated including existing incineration, anaerobic co-digestion, and a combination of existing incineration and anaerobic digestion. In part 2, two scenarios are assessed for treating the remaining food waste. In part 3, a proposed waste treatment scenario through a combination of waste treatment methods is identified based on the results from part 1 and part 2. The scenario is compared with the existing incineration scenario for treating all sewage sludge and food waste generated in Macau. Furthermore, a study is conducted to evaluate the condition with increased sewage sludge after the wastewater treatment plants are upgraded.In part 1 and part 2, anaerobic co-digestion scenario and anaerobic digestion scenario (i.e., for remaining food waste) outweigh other scenarios with the lowest environmental impacts and highest energy production. With the combination of these two selected scenarios, the proposed waste treatment scenario improves the performance in human health, ecosystems, and energy production by 36, 13, and 61 %, respectively, compared with the existing incineration scenario in Macau. Moreover, the proposed scenario also has better performance even if the generation of sewage sludge increases. The environmental performance of proposed scenario is almost two times better than the existing incineration scenario in human health categories.In this study, a proposed waste treatment strategy for sewage sludge and food waste in Macau is suggested with low environmental impacts and high energy production performance. The proposed waste treatment strategy includes a combination of anaerobic co-digestion and anaerobic digestion treatment method. The result of this study could serve as a reference to other urbanized countries or cities for sustainable treatment of sewage sludge and food waste. |
| Starting Page | 176 |
| Ending Page | 189 |
| Page Count | 14 |
| File Format | |
| ISSN | 09483349 |
| Journal | The International Journal of Life Cycle Assessment |
| Volume Number | 21 |
| Issue Number | 2 |
| e-ISSN | 16147502 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2015-11-27 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Anaerobic co-digestion Anaerobic digestion Food waste Incineration Life cycle assessment Sewage sludge Environment Environmental Economics Environmental Engineering/Biotechnology Environmental Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Science |
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