Escola de Engenharia Mauá, Instituto Mauá de Tecnologia (EEM/IMT), Praça Mauá 1, CEP 09 580-900, São Caetano do Sul, SP, Brazil.
J Environ Manage. 2011 Jul;92(7):1714-23. doi: 10.1016/j.jenvman.2011.02.001. Epub 2011 Mar 2.
The objective of this work was to analyze the interaction effects between temperature, feed strategy and COD/[SO(4)(2-)] levels, maintaining the same ratio, on sulfate and organic matter removal efficiency from a synthetic wastewater. This work is thus a continuation of Archilha et al. (2010) who studied the effect of feed strategy at 30 °C using different COD/[SO(4)(2-)] ratios and levels. A 3.7-L anaerobic sequencing batch reactor with recirculation of the liquid phase and which contained immobilized biomass on polyurethane foam (AnSBBR) was used to treat 2.0 L synthetic wastewater in 8 h cycles. The temperatures of 15, 22.5 and 30 °C with two feed strategies were assessed: (a) batch and (b) batch followed by fed-batch. In strategy (a) the reactor was fed in 10 min with 2 L wastewater containing sulfate and carbon sources. In strategy (b) 1.2 L wastewater (containing only the sulfate source) was fed during the first 10 min of the cycle and the remaining 0.8 L (containing only the carbon source) in 240 min. Based on COD/[SO(4)(2-)] = 1 and on the organic matter (0.5 and 1.5 gCOD/L) and sulfate (0.5 and 1.5 gSO(4)(2-)/L) concentrations, the sulfate and organic matter loading rates applied were 1.5 and 4.5 g/L.d, i.e., same COD/[SO(4)(2-)] ratio (=1) but different levels (1.5/1.5 and 4.5/4.5 gCOD/gSO(4)(2-)). When reactor feed was 1.5 gCOD/L.d and 1.5 gSO(4)(2-)/L.d, gradual feeding (strategy b) showed to favor sulfate and organic matter removal in the investigated temperature range, indicating improved utilization of the electron donor for sulfate reduction. Sulfate removal efficiencies were 87.9; 86.3 and 84.4%, and organic matter removal efficiencies 95.2; 86.5 and 80.8% at operation temperatures of 30; 22.5 and 15 °C, respectively. On the other hand, when feeding was 4.5 gCOD/L.d and 4.5 gSO(4)(2-)/L.d, gradual feeding did not favor sulfate removal, indicating that gradual feeding of the electron donor did not improve sulfate reduction.
这项工作的目的是分析温度、进料策略和 COD/[SO(4)(2-)]水平之间的交互作用，同时保持相同的比例，以去除合成废水中的硫酸盐和有机物。这项工作是 Archilha 等人的延续。（2010 年）在 30°C 下使用不同的 COD/[SO(4)(2-)]比和水平研究进料策略的影响。使用带有液相再循环的 3.7-L 厌氧序列间歇式反应器和固定在聚氨酯泡沫上的生物量（AnSBBR），在 8 h 周期内处理 2.0 L 合成废水。评估了 15、22.5 和 30°C 的三种温度，采用两种进料策略：(a) 分批和 (b) 分批后补料。在策略(a)中，反应器在 10 min 内用 2 L 含有硫酸盐和碳源的废水进料。在策略(b)中，在周期的前 10 min 内进料 1.2 L 废水（仅含有硫酸盐源），然后在 240 min 内进料剩余的 0.8 L（仅含有碳源）。基于 COD/[SO(4)(2-)]=1 和有机物（0.5 和 1.5 gCOD/L）和硫酸盐（0.5 和 1.5 gSO(4)(2-)/L）浓度，应用的硫酸盐和有机物负荷率分别为 1.5 和 4.5 g/L.d，即相同的 COD/[SO(4)(2-)]比（=1）但不同的水平（1.5/1.5 和 4.5/4.5 gCOD/gSO(4)(2-))。当反应器进料为 1.5 gCOD/L.d 和 1.5 gSO(4)(2-)/L.d 时，逐渐进料（策略 b）在考察的温度范围内有利于硫酸盐和有机物的去除，表明电子供体对硫酸盐还原的利用得到了改善。硫酸盐去除效率分别为 87.9%、86.3%和 84.4%，有机物去除效率分别为 95.2%、86.5%和 80.8%，分别在操作温度为 30°C、22.5°C 和 15°C 时。另一方面，当进料为 4.5 gCOD/L.d 和 4.5 gSO(4)(2-)/L.d 时，逐渐进料不利于硫酸盐去除，表明逐渐进料电子供体并没有改善硫酸盐还原。
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