Department of Sanitary and Environmental Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, MG, 31270-901, Brazil.
Civil Engineering Department, University Center-Catholic of Santa Catarina, Visconde de Taunay Street, 427-Downtown, Joinville, SC, 89203-005, Brazil.
Environ Sci Pollut Res Int. 2019 Feb;26(5):4521-4536. doi: 10.1007/s11356-018-2710-y. Epub 2018 Jul 11.
In the present study, a multistage route is proposed for the treatment of biodiesel industry wastewater (BWW) containing around 1000 mg L of total organic carbon (TOC), 3500 mg L of chemical oxygen demand (COD), and 1325 mg L of oil and grease. Initially, BWW aerobic biodegradability was assessed via Zhan-Wellens biodegradability test to confirm the appropriate treatment route. Then, a hybrid moving bed bioreactor (MBBR) system was chosen as the first treatment stage. The hybrid MBBR achieved 69 and 68% removal of COD and TOC removals, respectively, and provided great conditions for biomass growth. The bacterial community present in the hybrid MBBR was investigated by PCR-DGGE and potential biodegraders were identified such as: members of Desulfuromonadales, Nocardioidaceae and Pseudomonadaceae. Since biodegradation in the hybrid MBBR alone was unable to meet quality requirements, advanced oxidation processes, such as Fenton and photo-Fenton, were optimized for application as additional treatment stages. Physicochemical properties and acute toxicity of BWW were analyzed after the multistage routes: hybrid MBBR + Fenton, hybrid MBBR + photo-Fenton and hybrid MBBR + UV-C/HO. Hybrid MBBR + Fenton or photo-Fenton showed overall COD removal efficiencies greater than 95% and removed acute toxicity, thus being appropriate integrated routes for the treatment of real BWW. Graphical abstract ᅟ.
在本研究中，提出了一种多阶段路线来处理含有约 1000 mg/L 总有机碳（TOC）、3500 mg/L 化学需氧量（COD）和 1325 mg/L 油和油脂的生物柴油工业废水（BWW）。首先，通过 Zhan-Wellens 生物降解性测试评估 BWW 的好氧生物降解性，以确认合适的处理路线。然后，选择混合移动床生物膜反应器（MBBR）系统作为第一处理阶段。混合 MBBR 分别实现了 69%和 68%的 COD 和 TOC 去除率，为生物质生长提供了良好的条件。通过 PCR-DGGE 研究了混合 MBBR 中的细菌群落，并鉴定出潜在的生物降解菌，如脱硫单胞菌目、诺卡氏菌科和假单胞菌科。由于单独的混合 MBBR 生物降解无法满足质量要求，因此优化了芬顿和光芬顿等高级氧化工艺作为附加处理阶段。在多阶段路线：混合 MBBR+芬顿、混合 MBBR+光芬顿和混合 MBBR+UV-C/HO 之后，分析了 BWW 的物理化学性质和急性毒性。混合 MBBR+芬顿或光芬顿表现出总体 COD 去除效率大于 95%，并去除了急性毒性，因此是处理实际 BWW 的合适集成路线。
