Abstract Austin D, Scharf R, Chen C-F, Bode J. Hypolimnetic oxygenation and aeration in two Midwestern USA reservoirs. Lake Reserve Manage. 35:266–276. This study compares performance of hypolimnetic aeration (HA) with hypolimnetic oxygenation (HO) from 1988 to 2018, over multiple project phases and a baseline period 1984 to 1986. Saint Paul Regional Water Services, Minnesota, pumps 170 MLD (45 MGD) from the Mississippi River through a chain of 4 lakes before treatment. Two, Pleasant Lake and Vadnais Lake, were equipped with partial-lift HA later replaced by linear diffuser HO. Ferric chloride was injected into inflows and into Vadnais at the HA or HO system. HA failed to relieve hypolimnetic hypoxia in Pleasant (median DO 1.7 mg/L) or Vadnais (median DO 2.7 mg/L). Median HO values were aerobic (Pleasant 4.2 mg/L, Vadnais 8.5 mg/L). Both HA and HO raised hypolimnetic oxidation reduction potential to high positive values from negative values associated with Mn and Fe solubilization. Compared to HA, HO reduced median hypolimnetic total Mn concentrations by 75% in Pleasant and in 93% in Vadnais, and hypolimnetic total Fe by 84% in Pleasant and 81% in Vadnais. HA significantly lowered median hypolimnetic TP from baseline, 0.552 mg/L to 0.146 mg/L in Pleasant, and 0.533 mg/L to 0.045 mg/L in Vadnais. HO median hypolimnetic TP was significantly lower at 0.053 mg/L in Pleasant, 0.030 mg/L in Vadnais. Superior performance of HO occurred at similar oxygen delivery rates: 1775 kg/d in Pleasant and 970 kg/d in Vadnais, versus HA of 1200 kg/d in each lake. Performance differences are likely due to lower induced currents at the sediment surface by HO compared to HA.

中文翻译：

---

美国中西部两个水库的低浓度氧合和曝气

摘要 Austin D、Scharf R、Chen CF、Bode J. 美国中西部两个水库的低浓度氧合和曝气。湖泊保护区管理。35:266-276。本研究比较了 1988 年至 2018 年在多个项目阶段和 1984 年至 1986 年基线期的水下曝气 (HA) 与水下氧合 (HO) 的性能。明尼苏达州的圣保罗地区水务局从水泵中抽取了 170 MLD (45 MGD)密西西比河经过处理前的 4 个湖泊链。其中两个，Pleasant Lake 和 Vadnais Lake，配备了部分提升式 HA，后来被线性扩散器 H2O 取代。在 HA 或 H2O 系统中，将氯化铁注入流入物和 Vadnai。HA 未能缓解 Pleasant（中值 DO 1.7 mg/L）或 Vadnais（中值 DO 2.7 mg/L）中的低水文缺氧。中值 H2O 值是有氧的（宜人的 4.2 毫克/升，Vadnais 8.5 毫克/升）。HA 和 H2O 都将水下氧化还原电位从与 Mn 和 Fe 溶解相关的负值提高到高正值。与 HA 相比，H2O 使 Pleasant 和 Vadnais 的潜水总 Mn 浓度中值降低 75%，Vadnais 降低 93%，Pleasant 的潜水总 Fe 浓度降低 84%，Vadnais 降低 81%。HA 显着降低了从基线的中位低潜血 TP，在 Pleasant 中从 0.552 mg/L 降至 0.146 mg/L，在 Vadnais 中从 0.533 mg/L 降至 0.045 mg/L。在 Pleasant 和 Vadnais 中，H2O 中位潜水 TP 显着降低，分别为 0.053 mg/L 和 0.030 mg/L。H2O 的卓越性能发生在相似的氧气输送速率下：Pleasant 为 1775 kg/d，Vadnais 为 970 kg/d，而每个湖泊的 HA 为 1200 kg/d。性能差异可能是由于与 HA 相比，H2O 在沉积物表面产生的感应电流较低。