Environmental Sanitation Group, Department of Chemistry, State University of Paraiba, Av das Baraúnas, 351, Bodocongó 58109-753 Campina Grande, PB, Brazil.
Water Sci Technol. 2011;63(6):1183-7. doi: 10.2166/wst.2011.105.
This study evaluates the performance of four 2.3 m deep pilot-scale, independently loaded, primary facultative ponds treating predominantly domestic sewage in northeast Brazil. The ponds contained longitudinal baffles giving different length to width ratios from 3.55 to 32.4. The ponds had mean hydraulic retention times of ~15 days, and mean surface organic loadings of 330 kg BOD(5).ha.d(-1) during the first experimental phase and 375 kg BOD(5).ha.d(-1) in the second. The vertical inlets and outlets pipes were positioned at 1.8 m and 5 cm respectively below the pond surface in the first phase and at 50 cm and 1.8 m respectively in the second. All the ponds functioned as efficient primary facultative ponds but statistical analysis demonstrated no differences in effluent quality for most of the parameters measured for the various configurations of baffles and inlet and outlet depths. All behaved similarly to the unbaffled pond. The only exceptions were suspended solids and chlorophyll a concentrations which tended to be lower for all combinations of baffles with the outlets set 1.8 m below the surface. This study suggested that the longitudinal baffling of primary facultative ponds when using vertical inlets and outlets may well not significantly improve pond performance.
本研究评估了四个 2.3 米深的试点规模、独立负荷、主要兼性池塘在巴西东北部处理主要生活污水的性能。池塘内有纵向挡板，长宽比从 3.55 到 32.4 不等。这些池塘的水力停留时间平均约为 15 天，在第一实验阶段的平均表面有机负荷为 330kgBOD(5).ha.d(-1)，在第二阶段为 375kgBOD(5).ha.d(-1)。第一阶段的垂直进水管和出水管分别位于池塘表面以下 1.8 米和 5 厘米处，第二阶段则分别位于 50 厘米和 1.8 米处。所有池塘均作为高效的初级兼性池塘运行，但统计分析表明，对于各种挡板配置和进、出水口深度的大多数测量参数，出水质量没有差异。所有池塘的表现都与无挡板池塘相似。唯一的例外是悬浮固体和叶绿素 a 浓度，对于所有将出水口设置在表面以下 1.8 米处的挡板组合，这两个参数的浓度往往较低。本研究表明，当使用垂直进水管和出水管时，初级兼性池塘的纵向挡板可能不会显著提高池塘的性能。
