Biochemical and Bioenvironmental Engineering Laboratory, Department of Chemical Engineering, Ladoke Akintola University of Technology, Ogbomoso, Nigeria.
Biochemical and Bioenvironmental Engineering Laboratory, Department of Chemical Engineering, Delta State University, Abraka, Nigeria.
Environ Technol. 2020 Jun;41(14):1793-1813. doi: 10.1080/09593330.2018.1549106. Epub 2018 Nov 22.
The objectives of this study were to evaluate the potential of vertical surface flow constructed wetland (VSF-CW) vegetated with to treat petroleum refinery secondary wastewater under tropical conditions. Also, to provide a comparative evaluation of biotreatment kinetic models (traditional first order and other alternative kinetic models) proposed to describe the removal kinetics of organics (biochemical oxygen demand (BOD) and chemical oxygen demand (COD)), nitrate-nitrogen and total petroleum hydrocarbons (TPH) in wetland systems. The refinery secondary wastewater was characterized and treated in five VSF-CWs. were planted in three VSF-CWs and the remaining two VSF-CWs served as the unvegetated control. The wastewater relatively had high levels of turbidity (18.30 ± 3.88 NTU), BOD (20.40 ± 2.20 mg/L), COD (86 ± 6.0 mg/L), TPH (16.6 ± 1.76 mg/L), oil and grease (18.4 ± 2.00 mg/L), heavy metals (Cadmium (0.034 ± 0.01 mg/L), Lead (0.12 ± 0.05 mg/L), Chromium (0.47 ± 0.01 mg/L), Iron (1.54 ± 0.25 mg/L) and Nickel (0.09 ± 0.01 mg/L)) and Chloride (1412 ± 9.6 mg/L). The vegetated VSF-CWs significantly performed better than the unvegetated control and resulted in the removal efficiencies of 91.5% turbidity, 94.6% BOD, 80.2% COD, 92.6% TPH, 90.4% oil and grease, 94% cadmium, 92.5% lead, 93% chromium, 94.8% iron, 92.2% nickel, and 57.7% chloride. The results suggested that the proposed kinetic models were applicable for understanding the removal mechanisms of organics, nitrate-nitrogen and hydrocarbons in VSF-CW systems. Thus, planted VSF-CW has the potential of treating refinery secondary wastewater to discharge permissible limits.
本研究的目的是评估在热带条件下，垂直表面流人工湿地（VSF-CW）种植 处理炼油厂二级废水的潜力。此外，还对描述湿地系统中有机物（生化需氧量（BOD）和化学需氧量（COD））、硝酸盐氮和总石油烃（TPH）去除动力学的生物处理动力学模型（传统一级动力学模型和其他替代动力学模型）进行了比较评估。该炼油厂二级废水的特征和处理在五个 VSF-CW 中进行。在三个 VSF-CW 中种植了 ，其余两个 VSF-CW 作为无植被对照。废水相对较高的浊度（18.30±3.88 NTU）、BOD（20.40±2.20 mg/L）、COD（86±6.0 mg/L）、TPH（16.6±1.76 mg/L）、油和油脂（18.4±2.00 mg/L）、重金属（镉（0.034±0.01 mg/L）、铅（0.12±0.05 mg/L）、铬（0.47±0.01 mg/L）、铁（1.54±0.25 mg/L）和镍（0.09±0.01 mg/L）和氯化物（1412±9.6 mg/L）。种植 VSF-CW 的效果明显优于无植被对照，对浊度的去除效率达到 91.5%，BOD 为 94.6%，COD 为 80.2%，TPH 为 92.6%，油和油脂为 90.4%，镉为 94%，铅为 92.5%，铬为 93%，铁为 94.8%，镍为 92.2%，氯化物为 57.7%。结果表明，所提出的动力学模型适用于理解 VSF-CW 系统中有机物、硝酸盐氮和碳氢化合物的去除机制。因此，种植 VSF-CW 具有处理炼油厂二级废水以达到允许排放限值的潜力。
