A novel low temperature aerobic technology with electrochemistry for treating pesticide wastewater: Compliance rate, mathematical models, economic and environmental benefit analysis

• DOI: 10.1016/j.biortech.2021.125285
• Publication Date: 2021-05-15T10:57:31Z
• Authors: Liqiang Yu; Zhaobo Chen; Dongxue Hu; Hui Ge; Lixue Liu; Zhiguo Liu; Hongxia Liu; Yubo Cui; Wanjun Zhang; Xuejun Zou; Ying Zhang; Qiankun Zhu
• Keywords: Bioreactors; Electrochemistry; Temperature; Models, Theoretical; Pesticides; Wastewater; Waste Disposal, Fluid; 01 natural sciences; 6. Clean water; 0105 earth and related environmental sciences

In this study, a novel combination system of the tapered variable diameter biological fluidized bed (TVDBFB) with electrochemistry (EC) has been developed and its performances are investigated at different seasons. The results showed that the COD removal efficiency of TVDBFB increased from 61% to 67% and compliance rate increased from 84% to 88% when the carrier packing rate increased from 15% to 30% and temperature was 12 ℃. However, COD removal efficiency and compliance rate increased to 87% and 100% when EC was a post treatment unit. The mathematical models could fit well with the attached biomass, which can be applied to reflect and predict the biomass per unit carrier under different conditions, and the EC removal of COD follow the first-order reaction kinetic model. The economic and environmental benefit analysis indicated that TVDBFB and EC were feasible for treating pesticide wastewater.