Recycling resources from coffee by-products via hydrothermal conversion for sustainable coffee farming in Vietnam
Huyen Chau Dang1, Judy Libra1, Christina Dornack2, Marcus Fischer1
1Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Post Harvest Technology, Germany
Vietnam is the world's second-largest coffee-producing country, depending on over half a million smallholder households, most with less than 2 hectares, to produce 95% of its coffee production (Anh et al., 2019). However, Vietnam's coffee sector is facing challenges to remain competitive: 1) world market pressure to improve product quality, 2) climate change with threats of drought, pest, and disease attack, 3) the need to promote product diversification. Measures to meet these challenges range from expanding the wet-processing capacity of coffee berries, to improving the resilience of the growers through agroecological farming and ensuring that sustainable production standards are met throughout the value chain. While wet-processing can make farmers and the whole value chain less dependent on weather conditions and produce higher quality coffee beans, new challenges arise from the centralised production of large amounts of by-products in these plants. Approaches and technical methods to support local recycling of the nutrient and carbon resources in the coffee by-products are required in keeping with the agroecological farming principles. The conversion of the coffee by-products to stabilised carbon-rich materials that can be returned to the coffee farmers as a soil improver and fertiliser is the focus of this study.
Keywords: Carbon and nutrient recovery, coffee farming, coffee value chain, hydrothermal carbonisation, sustainability
Contact Address: Huyen Chau Dang, Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Post Harvest Technology, Max-Eyth-Allee 100, 14469 Potsdam, Germany, e-mail: hdangatb-potsdam.de