Applying life cycle assessment (LCA) and life cycle costing (LCC) tools for waste recovery model in super-intensive shrimp farming system in Ca Mau province

Abstract

This study aims to evaluate the environmental sustainability and economic efficiency of waste recovery solutions from a typical super-intensive shrimp farming household (shrimp farming on tarpaulin ponds) in Ca Mau province based on on the life cycle assessment (LCA) tool that focuses on assessing greenhouse gas emissions combined with life cycle cost (LCC) for post-recovery products. Options considered to treat wastewater and sludge towards zero emissions from shrimp farming households include: i) wastewater treatment using a system of settling ponds and biological treatment ponds; ii) sludge treatment with biogas tank and composting. The results show that greenhouse gas emissions are mostly in the operating phase (electricity consumed by operating the circulating water pump from the second biological pond to the household's current farming system), accounting for 29.5% compared to other periods. The proposed system of circulating wastewater and sludge solutions for super-intensive shrimp farming shows economic benefits when for every 1m3 of water reused, people benefit 32.22 VND and 1kg of Compost people benefit. benefited 786.67 VND. The limitation of the study is that it has not calculated the amount of greenhouse gases generated from the respiration of animals and aquatic plants participating in the wastewater treatment process in biological treatment ponds. Finally, the CO2 emissions of the auxiliary facilities are calculated for the first farming crop. When the model operates stably for the following years, CO2 emissions will be significantly reduced due to no new construction.