Using biochar from spent coffee grounds to treat pollution in livestock wastewater
- Authors: Huong Thu Thi Tran 1*, Tong Xuan Nguyen 2, Yen Hai Thi Trinh 1, Hang Thi To 1, Huyen Thanh Thi Dang 1, Linh Thuy Thi Vu 1, Phuong Thi Nguyen 1, Thuy Thu Dinh 3
1 Faculty of Environment, Hanoi University of Mining and Geology, Vietnam
2 Institute of Environmental Science, Engineering and Management, Industrial University of Ho Chi Minh City, Vietnam
3 Microbiology Laboratory, Quatest 1, Directorate for Standard Metrology and Quality, Vietnam
- Received: 18th-Aug-2020
- Revised: 3rd-Sept-2020
- Accepted: 31st-Oct-2020
- Online: 31st-Oct-2020
- Section: Environment
Four types of biochar material synthesized from spent coffee grounds by slow pyrolysis process CF1 (500(C/0.5h); CF2 (500(C/1.5h); CF3 (500(C/3h); CF4 (500(C/6h) is studied to treat two pollution parameters (COD and TSS) in livestock wastewater. Material characteristics were determined by SEM, EDX and BET methods. The results showed that the 4 samples of biochar materials were structured fiber clearly, the interplanar spacing which corresponds to the lattice plane. The C content in the biochar sample is higher than the initial raw material sample; the highest value recorded reaches 90.61% C (CF2). 100 mL of the original livestock waster water is filtered through columns with 4g of biochar CF1-CF4 during reaction times varied from 0h, 1h, 4h and 8h, the COD treatment efficiency and adsorption content of CF4 sample is highest of 96.41% and 188 mg/g after 8h, and the lowest value is 76.67% and 149.5 mg/g after 1h recorded in CF3 sample, however the COD value after treatment is still higher from 1.2 to 1.46 times than Vietnamese standard 62: 2016/MONRE - national technical regulation on the effluent of livestock. The CF3 material samples have the highest TSS treatment efficiency and adsorption content of 95.19% and 6.425 mg/g after 8h and the lowest of 66.78% and 4.575 mg/g recorded in CF1 samples after 1h, response the requirements of QCVN 62: 2016/MONRE. The results showed that biochar is a potential sorbent to removed pollutants from waste water.
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