| Summary: | 碩士 === 逢甲大學 === 環境工程與科學學系 === 102 === This study investigated the influences of the three-stage wastewater treatment and clean-pig model on the carbon footprint and water footprint of pig farming. By identifying the inventory of carbon footprint and water footprint, the carbon emission and water consumption of the pig farming in the different growth stages of pig was comprehended.
The results of this study indicated that the carbon footprint for one kilogram of pork were 4.64 and 3.88 kgCO2eq for the three-stage wastewater treatment and the clean-pig model, respectively. The difference of these two carbon footprints was 0.76 kgCO2eq. When the manure solid was picked up before washing as in the clean-pig model, the carbon footprint per kilogram of pork was 3.61 kgCO2eq, which was 1.03 kgCO2eq less than the three-stage wastewater treatment.
Results of this study showed that the water footprint per kilogram of pork were 3,424 and 3,317 kg for the three-stage wastewater treatment and the clean-pig model, respectively. The difference of these two water footprints was 107 kg. If the treated wastewater was not reused, the water footprints were 3,459 and 3,336 kg per kilogram of pork for the three-stage wastewater treatment and the clean-pig model, respectively. The difference of these two water footprint was 123 kg.
Base on the carbon footprint produced at different growth stages of pig, the order for the carbon footprint was piggery wastewater treatment > pig feed generation > slaughtering process > transportation > energy resource. The order for the water foot print was pig feed generation > piggery wastewater treatment > slaughtering process > transportation. The component analysis showed that the order for the water footprint of pig farming was green water footprint > blue water footprint > grey water footprint. The generation of pig contributed most the green water footprint.
To conclude, the types of the piggery wastewater treatments greatly influenced the carbon footprint and water footprint of pig farming. The clean pig model effectively reduced the carbon footprint and water footprint. The Council of Agriculture should promote the clean pig model and grant funds to reduce the carbon footprint and water footprint of the pig farming.
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