WASTE AUDIT OF CATTLE PRODUCTION IN MINH CHAU COMMUNE, BA VI DISTRICT, HANOI
Abstract
This study applies a waste audit tool to quantify generated waste and nutrition recovery for cattle production. The research contents include calculation of inputs and outputs; characterization of wastes; pollution level and pollution reduction solutions. Field research was carried out with 60 households raising cattle, waste audit was carried out at 03 households. Research results show that livestock households have a relatively small scale with an average of 09 heads/household. Estimated life cycle (20 months for beef cattle), each consumes 11.73 tons of food, 94.62 m3 of water, 6 mg antibiotics and vaccine and generated 4,46 tons of wastes, 90.6 m3 of wastewater. The estimated waste is 67.55 tons/day, waste water is about 893.3 m3/day. Waste recovery rate achieved 83.7%, of which, fertilizing for trees (61.1 %), biogas collection (35.87%), earthworm raising (3.06%) and discharged into environment after biogas. The TSS concentration exceeds 1.47-1.67 times, Total N is 1.52 times, COD is 1.39 times, BOD5 is 1.67 - 2.34 times and Coliform exceeds 1.8–8.8 times compared to QCVN62:2016/BTNMT (National Regulation on Livestock Wastewater).