CIRCULAR ECONOMY APPROACH IN AGRICULTURAL WASTES MANAGEMENT: A CASE STUDY IN MINH CHAU COMMUNE, BA VI, HA NOI

Abstract

The agricultural wastes including crop residues and livestock manures contains high contents of organic matter and nutrients still discharged into environment. This research proposed the circular economy approach in waste reutilization as its interaction between crop and livestock systems. The waste audit technique was applied to evaluate feeding and discharge during the life cycle of cow. The results showed a diverse component of agricultural production with king grass, banana, and maize. The main livestock production included cows, pigs; and poultries. The total waste from livestock generated about 114.2 tons of waste (manure) per day. Manures were used for biogas (35%), fertilizer directly for plant (61.06%), earthworm feedstuff (3.06%), and fish (0.01%). The king grass, banana and maize were used as main feeding stuffs (92% of the total amount) for cow. King grass yields 200-250 tons/ha representing highest amount of nitrogen source roughly 8.09 tons/day (84.5%) in feeding intake by cow. Minh Chau commune shows a potential for applying a closing loop of waste-resources within the crop-livestock production.