Celis-García Lourdes B, Razo-Flores Elías, Monroy Oscar
Universidad Autónoma Metropolitana-Iztapalapa, Departamento de Biotecnología. Ave. San Rafael Atlixco 186, Col. Vicentina, Iztapalapa D.F., México.
Biotechnol Bioeng. 2007 Jul 1;97(4):771-9. doi: 10.1002/bit.21288.
The use of a down-flow fluidized bed (DFFB) reactor for the treatment of a sulfate-rich synthetic wastewater was investigated to obtain insight into the outcome of sulfate reduction in a biofilm attached to a plastic support under a down-flow regime. Fine low-density polyethylene particles were used as support for developing a biofilm within the reactor. The reactor treated a volatile fatty acids mixture of acetate or lactate, propionate, and butyrate at different chemical oxygen demand (COD) to sulfate ratios ranging from 1.67 to 0.67 (g/g). Organic loading rate changed from 2.5 to 5 g COD/L x day and sulfate loading rate increased from 1.5 to 7.3 g SO(4) (2-)/L x day. At the beginning of continuous operation, methanogenesis was the predominant process; however, after 187 days, sulfate reduction became the main ongoing biological process. After 369 days, a COD removal of 93% and a sulfate removal of 75% were reached. Total sulfide concentrations in the reactor ranged from 105, when the reactor was mainly methanogenic, to around 1,215 mg/L at the end of the experiment. The high sulfide concentrations did not affect the performance of the reactor. Results demonstrated that the configuration of the DFFB reactor was suitable for the anaerobic treatment of sulfate-rich wastewater.
研究了使用下流式流化床（DFFB）反应器处理富含硫酸盐的合成废水，以深入了解在向下流动状态下附着于塑料载体的生物膜中硫酸盐还原的结果。使用细小的低密度聚乙烯颗粒作为载体，在反应器内形成生物膜。该反应器处理了由乙酸盐或乳酸盐、丙酸盐和丁酸盐组成的挥发性脂肪酸混合物，化学需氧量（COD）与硫酸盐的比例在1.67至0.67（g/g）之间变化。有机负荷率从2.5 g COD/L·天变化到5 g COD/L·天，硫酸盐负荷率从1.5 g SO₄²⁻/L·天增加到7.3 g SO₄²⁻/L·天。在连续运行开始时，产甲烷作用是主要过程；然而，187天后，硫酸盐还原成为主要的持续生物过程。369天后，COD去除率达到93%，硫酸盐去除率达到75%。反应器中的总硫化物浓度范围从反应器主要进行产甲烷作用时的105，到实验结束时的约1215 mg/L。高硫化物浓度并未影响反应器的性能。结果表明，DFFB反应器的配置适用于厌氧处理富含硫酸盐的废水。
