Circular Economy Approach in Organic Fertilizer Production from Agricultural by-Products in Ba Vi District, Hanoi

: Ba Vi is one of the districts with huge agricultural production activities of Hanoi. Besides the main agricultural products supplied to the market. Ba Vi also generates a large number of agricultural by-products and it is being wasted. In recent times, the model of using two main sources of cow manure and rice straw after harvest to produce organic fertilizer has opened a new direction for local economic development, taking advantage of agricultural by-products. and solve many related environmental problems. This study aims to evaluate the efficiency as well as the accessibility to the circular economy of the organic fertilizer production model in Van Hoa commune, Ba Vi, Hanoi. The results show that organic fertilizer meets the standards with the incubation time of biological products in the range of 60 - 75; pH around 7.1; humidity less than 35%; The organic content is about 37.24 g/kg of manure. At peak times, each month this model is capable of handling more than 150 tons of agricultural by-products, creating jobs for 7 - 10 workers. The development of this organic production method has reduced the amount of straw burned in the field by 8.4%, treated 20.5% of livestock waste in the district, and solved the difficult problem of inorganic fertilizers, approach and application of circular economy, increase the level of waste use.