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首页> 外文期刊>Journal of the American Water Resources Association >BATCH REACTOR UNVEGETATED WETLAND PERFORMANCE IN TREATING DAIRY WASTEWATER
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BATCH REACTOR UNVEGETATED WETLAND PERFORMANCE IN TREATING DAIRY WASTEWATER

机译：间歇式反应器在乳品废水处理中无植被的湿地性能

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Wetlands that treat holding pond effluent can be designed to utilize the pond storage capacity to allow flexibility in system management. Management of a wetland as a sequencing batch reactor can simplify operation and control detention times, but little performance data on such systems are available. The objective of this study was to evaluate the batch reactor wetland concept by quantifying removal of chemical oxygen demand (COD), total suspended sediments (TSS), total nitrogen (TN), ammonium (NH_4), nitrate (NO_3), total phosphorus (TP), and orthophosphate (PO_4) and by assessing the suitability of first-order kinetics. Weekly samples were collected following batch loadings of wetland cells with high concentration or low concentration dairy holding pond wastewater during both fall and spring seasons. During three-week batch periods without plants, overall mass removal averaged 54 percent for COD, 58 percent for TSS, 90 percent for TN, 72 percent for NH_4, -54 percent for NO_3, 38 percent for TP, and -8 percent for PO_4. Best fit, first-order kinetic rate constant (k) and background concentration (C~*) for COD varied by season, with k = 0.024/d and C~* = 0 mg/l in fall and k = 0.056/d and C~* = 200 mg/l in spring. Ammonium exhibited a consistent C~* = 0 mg/l but had variable rate constants of k = 0.121/d for low concentration treatments and k = 0.079/d for high concentration treatments. Using first-order kinetics was also appropriate for TN, with k = 0.061/d and C~* = 0 mg/l for all loadings and seasons, but was not consistently appropriate for TP or PO_4. These results support the use of first-order kinetics to describe treatment in batch reactor wastewater treatment wetlands without vegetation, perhaps during the establishment phase or in open water zones of vegetated wetlands. Further work is needed to assess the effects of vegetation.
机译：可以设计用来处理池塘污水的湿地，以利用池塘的存储能力，从而在系统管理方面具有灵活性。将湿地作为顺序批处理反应器进行管理可以简化操作和控制滞留时间，但是此类系统的性能数据很少。这项研究的目的是通过定量去除化学需氧量（COD），总悬浮沉积物（TSS），总氮（TN），铵（NH_4），硝酸盐（NO_3），总磷（ TP）和正磷酸盐（PO_4），并评估一级动力学的适用性。在秋季和春季都分批装载高浓度或低浓度乳品储存池塘废水的湿地细胞之后，每周收集一次样品。在没有工厂的三周分批处理期间，COD的总体去除质量平均为54％，TSS的去除率为58％，TN的去除率为90％，NH_4的去除率为72％，NO_3的去除率为-54％，TP的去除率为38％，PO_4的去除率为8％。 。最佳拟合，COD的一级动力学速率常数（k）和背景浓度（C〜*）随季节而变化，秋季k = 0.024 / d和C〜* = 0 mg / l，k = 0.056 / d和春季C〜* = 200 mg / l。铵表现出一致的C〜* = 0 mg / l，但是对于低浓度处理，其常数常数k = 0.121 / d，对于高浓度处理，k = 0.079 / d。使用一阶动力学也适用于TN，在所有负荷和季节下k = 0.061 / d和C〜* = 0 mg / l，但不适用于TP或PO_4。这些结果支持使用一级动力学来描述在没有植被的间歇式反应器废水处理湿地中的处理，也许是在建立阶段或在植被湿地的开阔水域中进行的处理。需要进一步的工作来评估植被的影响。

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