Livestock wastes have become a growing worry especially in peri-urban areas of Thailand.
The major source of livestock wastes is mainly derived from swine farms. The study was theoretically based on a welfare economic approach in which the Coase Theorem was employed. The study came in a line with investigating abatement and environmental damage costs drawn from swine wastes. It intended to identify optimal abatement levels of the pollutions in order to improve social welfare of the studied community. Moreover, a participatory approach is included in the study. The analytical framework was organized into 2 working tasks. Task 1 dealt with a mathematical linear programming model used to derive marginal abatement costs. Task 2 was associated with a hedonic pricing model applied to retrieve marginal environmental damage costs. The outcomes of the two tasks were equated in accordance with the Coase approach. The study emphasized on the farm pollutions in forms of environmental indicators such as nitrogen (N), phosphorus (P), biological oxygen demand (BOD), chemical oxygen demand (COD), suspended solids (SS), and pH value.
The analytical result indicated that the actual abatement levels of phosphorus, nitrogen, and BOD were significantly lower than the calculated optimal abatement levels. It is recommended that the swine farm community should attempt to increase the abatement levels of phosphorus, nitrogen, and BOD approximately one time higher than the abatement levels on a routine basis.
The results of sensitivity analyses implied that the single approach scenarios (on either decreasing in marginal abatement costs alone or increasing in net gains from manure markets alone) were likely to be inadequate to improve the community s social welfare in terms of both monetary values and optimal abatement levels. On the contrary, the mixed approach scenarios seem to be better alternatives. This can voluntarily be done by improving abatement technology and manure market environment.
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