A case study of circular economy from waste

Do Van Manh; Nguyen Tuan Minh; Le Xuan Thanh Thao; Huynh Duc Long; Luong Huu Thanh; Vu Dinh Ngo; Dang Thi Thom

doi:10.15625/2525-2518/16766

Author affiliations

Authors

Do Van Manh Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 – Hoang Quoc Viet Road, Cau Giay District, Ha Noi, Viet Nam; Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Ha Noi, Viet Nam
Nguyen Tuan Minh Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 – Hoang Quoc Viet Road, Cau Giay District, Ha Noi, Viet Nam
Le Xuan Thanh Thao - Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 – Hoang Quoc Viet Road, Cau Giay District, Ha Noi, Viet Nam; Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 – Hoang Quoc Viet Road, Cau Giay District, Ha Noi, Viet Nam
Huynh Duc Long Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 – Hoang Quoc Viet Road, Cau Giay District, Ha Noi, Viet Nam
Luong Huu Thanh Institute of Agricultural Environment, Phu Do Ward, Nam Tu Liem District, Ha Noi, Viet Nam
Vu Dinh Ngo Viet Tri University of Industry, 9 Tien Son Street, Tien Cat Sub-district, Viet Tri City, Phu Tho province, Viet Nam
Dang Thi Thom - Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 – Hoang Quoc Viet Road, Cau Giay District, Ha Noi, Viet Nam; Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 – Hoang Quoc Viet Road, Cau Giay District, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/16766

Keywords:

circular economy, energy recovery, organic fertilizer, sludge management, waste sludge treatment

Abstract

This case study focused on zero emission via waste sludge treatment process from a brewery wastewater treatment plant. A perspective solution was based on three main processes by sludge digestion (40 m³/day), biogas recovery and purification for generation (20 kWh) and organic fertilizer production for green agriculture. The system is designed to integrated processes and operated autocompletively, except for the fertilization of crops. This work results showed that organic content decreased 55 - 70% after 20 days of sludge retention time (SRT) with 55 - 65% methane (CH₄) yield. The contaminants in biogas was purified by high gravity rotating packed bed (HGRPB) device using aqueous solution (NaOH 0.01 M) and removal efficiency of CH₄ concentration is 87%, this CH₄ content met a demand of the standard for generator engines or boiler combustion. The digested sludge was combined with other by-products to produce organic fertilizer for green agricultural development, the quality of organic fertilizer was examined and met the regulations of Decree No. 84/2019/ND-CP of the Government: Regulations on fertilizer management. The achievements of this case study respond the harmonious combination among waste treatment, energy recovery and organic fertilizer production to contribute to the direction of the circular economy aspect and sustainable development.

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