Postgraduate Program of Environment and Sustainable Technologies, Federal University of Fronteira Sul, Av. Jacob Reinaldo Haupenthal, 1580, 97900-000, Cerro Largo, RS, Brazil.
Postgraduate Program of Environment and Sustainable Technologies, Federal University of Fronteira Sul, Av. Jacob Reinaldo Haupenthal, 1580, 97900-000, Cerro Largo, RS, Brazil.
J Environ Manage. 2020 Jun 15;264:110473. doi: 10.1016/j.jenvman.2020.110473. Epub 2020 Apr 2.
A photo-electro-Fenton (PEF) reactor employing boron-doped diamond (BDD) and soft iron anodes was studied in landfill leachate (LL) treatment. The reactor operation parameters (ROP) HO concentration, current intensity and flow rate were investigated in the removal of Abs 254 nm. The PEF process with BDD anode, operating at the best operational conditions, was used as a pre-treatment and enabled biological oxidation (BO). The treatment strategy of PEF followed by BO showed to be the most efficient, reaching reductions of 77.9% chemical oxygen demand (COD), 71.5% total carbon (TC) and 76.3% radiation absorbance in 254 nm (Abs 254 nm), as well as a significant reduction in the genotoxicity (Allium cepa), observed by an increase in the mitotic index (MI) (131.5%) and decrease in the abnormalities (47.8%). The reduction of the toxic potential of LL using the integration of processes was also observed in the gas chromatography-mass spectrometry (GC-MS) byproducts analysis, which indicated the removal of emerging contaminants, such as Bisphenol-A (BPA), N,N-Diethyl-3-methylbenzamide (DEET) and Diisooctyl phthalate (DIOP). Thus, the PEF process integrated with BO presented a considerable efficiency in the removal of contaminants present in LL, becoming an alternative for the minimization of the environmental impacts caused by the discharge of this effluent in the environment.
光电芬顿（PEF）反应器采用掺硼金刚石（BDD）和软铁阳极，用于处理垃圾渗滤液（LL）。研究了 HO 浓度、电流强度和流速等反应器操作参数（ROP）对 Abs 254nm 去除率的影响。在最佳操作条件下，采用 BDD 阳极的 PEF 工艺作为预处理，实现了生物氧化（BO）。PEF 预处理后进行 BO 的处理策略最为有效，可使化学需氧量（COD）降低 77.9%、总碳（TC）降低 71.5%、Abs 254nm 辐射吸收率降低 76.3%，同时通过提高有丝分裂指数（MI）（131.5%）和降低异常率（47.8%），显著降低了 LL 的遗传毒性。通过整合工艺，还可以通过气相色谱-质谱（GC-MS）副产物分析观察到 LL 毒性降低，这表明可以去除双酚 A（BPA）、N,N-二乙基-3-甲基苯甲酰胺（DEET）和邻苯二甲酸二异辛酯（DIOP）等新兴污染物。因此，与 BO 集成的 PEF 工艺在去除 LL 中存在的污染物方面具有较高的效率，成为减少这种废水排放对环境造成影响的一种替代方法。
