Moreira Mariana Bueno, Ratusznei Suzana Maria, Rodrigues José Alberto Domingues, Zaiat Marcelo, Foresti Eugênio
Escola de Engenharia Mauá, Instituto Mauá de Tecnologia (IMT), Praça Mauá 1, CEP 09.580-900, São Caetano do Sul, SP, Brazil.
Bioresour Technol. 2008 May;99(8):3256-66. doi: 10.1016/j.biortech.2007.05.068. Epub 2007 Jul 31.
Safe application of the anaerobic sequencing biofilm batch reactor (ASBBR) still depends on deeper insight into its behavior when faced with common operational problems in wastewater treatments such as tolerance to abrupt variations in influent concentration, so called shock loads. To this end the current work shows the effect of organic shock loads on the performance of an ASBBR, with a useful volume of 5L, containing 0.5-cm polyurethane cubes and operating at 30 degrees C with mechanical stirring of 500 rpm. In the assays 2L of two types of synthetic wastewater were treated in 8-h cycles. Synthetic wastewater I was based on sucrose-amide-cellulose with concentration of 500 mg COD/L and synthetic wastewater II was based on volatile acids with concentration ranging from 500 to 2000 mg COD/L. Organic shock loads of 2-4 times the operation concentration were applied during one and two cycles. System efficiency was monitored before and after application of the perturbation. When operating with concentrations from 500 to 1000 mg COD/L and shock loads of 2-4 times the influent concentration during one or two cycles the system was able to regain stability after one cycle and the values of organic matter, total and intermediate volatile acids, bicarbonate alkalinity and pH were similar to those prior to the perturbations. At a concentration of 2000 mg COD/L the reactor appeared to be robust, regaining removal efficiencies similar to those prior to perturbation at shock loads twice the operation concentration lasting one cycle and stability was recovered after two cycles. However, for shock loads twice the operation concentration during two cycles and shock loads four times the operation concentration during one or two cycles filtered sample removal efficiency decreased to levels different from those prior to perturbation, on an average of 90-80%, approximately, yet the system managed to attain stability within two cycles after shock application. Therefore, this investigation envisions the potential of full scale application of this type of bioreactor which showed robustness to organic shock loads, despite discontinuous operation and the short times available for treating total wastewater volume.
厌氧序批式生物膜反应器（ASBBR）的安全应用仍依赖于更深入地了解其在面对废水处理中常见操作问题（如对进水浓度突然变化的耐受性，即所谓的冲击负荷）时的行为。为此，当前的研究展示了有机冲击负荷对一个有效容积为5L、装有0.5厘米聚氨酯立方体、在30摄氏度下以500转/分钟的机械搅拌运行的ASBBR性能的影响。在实验中，两种类型的合成废水各2L以8小时的周期进行处理。合成废水I基于浓度为500mg COD/L的蔗糖 - 酰胺 - 纤维素，合成废水II基于浓度范围为500至2000mg COD/L的挥发性酸。在一个和两个周期内施加了运行浓度2至4倍的有机冲击负荷。在施加扰动之前和之后监测系统效率。当在500至1000mg COD/L的浓度下运行，且在一个或两个周期内施加进水浓度2至4倍的冲击负荷时，系统能够在一个周期后恢复稳定，有机物、总挥发性酸和中间挥发性酸、碳酸氢盐碱度和pH值与扰动前相似。在2000mg COD/L的浓度下，反应器似乎很稳健，在持续一个周期的运行浓度两倍的冲击负荷下恢复到与扰动前相似的去除效率，并且在两个周期后恢复稳定。然而，对于在两个周期内运行浓度两倍的冲击负荷以及在一个或两个周期内运行浓度四倍的冲击负荷，过滤后样品的去除效率降低到与扰动前不同的水平，平均约为90% - 80%，但系统在冲击施加后的两个周期内仍设法恢复稳定。因此，本研究设想了这种类型生物反应器大规模应用的潜力，尽管其运行不连续且处理总废水量的时间较短，但它对有机冲击负荷表现出稳健性。
