A Study on the Efficiency of Cyanide (CN-) Removal from Cassava Starch Factory Wastewater Using an Upflow Anaerobic Sludge Blanket (UASB) Reactor
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Abstract
This study evaluates the efficiency of cyanide (CN-) removal from cassava starch processing wastewater using a laboratory-scale Upflow Anaerobic Sludge Blanket (UASB) reactor. The experimental model, with a working volume of 10 liters, was operated in three phases corresponding to initial COD concentrations of 1,000; 2,000; and 4,200 mgO₂/L, and CN- concentrations of 8.7; 17.4; and 36.6 mg/L, respectively, at a pH of 6.91. The results demonstrated high CN- removal efficiencies ranging from 97.5% to 99% across all phases. However, the effluent CN- concentrations still exceeded the permissible limit of Column B under QCVN 63:2017/BTNMT. COD removal efficiency remained stable between 60% and 70% after the acclimation period, though the effluent COD values also surpassed the regulatory standards. Biogas production averaged 4.71 L/day during Phase 2 and slightly decreased in Phase 3 due to organic loading exceeding the optimal threshold.
Keywords
Cyanide, UASB, wastewater treatment, cassava starch, biogas
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References
Dongxue, H., Hongchao, M., Zhaobo, C., Yuanyi, Z., Yubo, C., Xuejun, Z., Pan, W., Hui, G., Kongyan, L., Lufeng, Z., Wenyu, L., Hongcheng, W. (2019). Performance improvement and model of a bio-electrochemical system built-in up-flow anaerobic sludge blanket for treating b-lactams pharmaceutical wastewater under different hydraulic retention time. Water Research, 164, 114915. https://doi.org/10.1016/j.watres.2019.114915.
Gijen, H.J., Bernal, E., Ferrer, H. (2000). Cyanide toxicity and cyanide degradation in anaerobic wastewater treatment. Water Research, 34(9), 2447 - 2454. https://doi.org/10.1016/S0043-1354(99)00418-2
Huynh, T.D, Tran, Q.V., Nguyen, H.D., Le, Q.L., Vu, T.T.N., Pham, A.V., Ngo, K.S., Nguyen, Đ.K., Tran, T.M.N., Tran, T.K. (2021). Khảo sát ảnh hưởng của nồng độ muối đến hiệu suất xử lý COD của mô hình UASB đối với nước thải sản xuất nước tương trong điều kiện thí nghiệm [Impact of salinity on cod treatment efficiency in the soy sauce wastewater treatment by UASB model in vitro]. Journal of Science Technology & Food - Ho Chi Minh City University of Food Industry, 21(4), 57 - 65.
Kandasamy, S., Dananjeyan, B., Krishnamurthy, K., Benckiser, G. (2015). Aerobic cyanide degradation by bacterial isolates from cassava factory wastewater. Brazilian Journal of Microbiology, 46(3), 659 - 666. http://dx.doi.org/10.1590/S1517-838246320130516.
Luque-Almagro, V., Cabello, P., Sáez, L.P., Abril, A.O., Moreno-Vivián, C., Roldán, M.D. (2018). Exploring anaerobic environments for cyanide and cyano-derivatives microbial degradation. Applied Microbiology and Biotechnology, 102(6), 1067 - 1074. https://link.springer.com/article/10.1007%2Fs00253-017-8678-6
Mpongwana, N., Ntwampe, S.K.O., Omodanisi, E.I., Chidi, B.S., Razanamahandry, L.C. (2019). Sustainable approach to eradicate the inhibitory effect of free - cyanide on simultaneous nitrification and aerobic denitrification during wastewater treatment. Sustainability, 11(21), 6180. https://doi.org/10.3390/su11216180.
Naveen, D., Majumder, C.B., Mondal, P., Shubha, D. (2011). Biological Treatment of Cyanide Containing Wastewater. Research Journal of Chemical Sciences, 1(7), 15 - 21.