Lysimeter Experiments to Determine the Ability of Soil to Reduce Concentrations of BOD, Available P and Inorganic N in Dirty Water
Lysimeter Experiments to Determine the Ability of Soil to Reduce Concentrations of BOD, Available P and Inorganic N in Dirty Water
复制标题
测定土壤降低脏水中 BOD、有效磷和无机氮浓度的能力的蒸渗计实验
DOI：
10.1080/09593332608618593
复制
发表时间：
2005
影响因子：
2.8
通讯作者：
A. Retter
中科院分区：
文献类型：
--
作者：
S. Brookman;D. Chadwick;A. Retter
通过蒸渗仪试验，研究了不同土壤对污水中生化需氧量(BOD)、钼酸盐类活性磷(MRP)和氨氮(NH4+-N)浓度的影响，以及不同施肥量对硝酸盐淋失的影响。另一项实验考察了污水成分对淋洗质量的影响。需要这些信息来评估污水应用对污染地下水的潜在风险，并评估在开发污水处理系统时使用这种土壤的情况。完整和受干扰的土壤蒸渗仪分别由四种土壤建造，深度分别为0.5m和1m；粗砂壤、软砂岩上的砂壤土、白垩岩上的钙质粉质粘土和花岗岩上的沙壤土。对于粗大的自由排水沙壤土，蒸渗仪也是从扰动的土壤中建造的，包括添加和不添加石灰，以评估这是否可以增加磷的固定。在实验室条件下，测定了污水处理后渗滤液的BOD、MRP、NH4+-N和硝酸盐(NO3-−-N)浓度，分别为2 mm和8 mm·d-−-1。在每日施肥量为2 mm的条件下，所有土壤都能有效地处理污水，BOD、MRP和NH4+-N的浓度降低了98%，而花岗岩上砂壤土0.5m渗漏仪上的NO3-−-N浓度增加到了80 mg-1。在8 mm/d施肥量下，土壤对降低BOD、MRP和NH4+-N的效果较差，扰动土壤渗滤液中NO3-−-N的最大浓度为2 0 0 mg L−1。
Lysimeter experiments were conducted to determine the ability of different soils to reduce levels of biochemical oxygen demand (BOD) and concentrations of molybdate reactive phosphorus (MRP) and ammonium-N (NH4 +-N) in dirty water and the impact of applications on nitrate leaching. An additional experiment investigated the effect of dirty water components on leaching quality. This information is required to assess the potential risk of dirty water applications on polluting groundwater and to assess the use of such soils in the development of treatment systems for dirty water. Intact and disturbed soil lysimeters, 0.5 and 1m deep were constructed from four soils; a coarse free-draining sandy loam, a sandy loam over soft sandstone, a calcareous silty clay over chalk and a sandy loam over granite. For the coarse free-draining sandy loam, lysimeters were also constructed from disturbed soil with and without the addition of lime, to assess if this could increase phosphorus immobilisation. Levels of BOD and concentrations of MRP, NH4 +-N and nitrate (NO3 − -N) of leachates were measured following dirty water applications at 2 and 8 mm day−1 under laboratory conditions. Under the daily 2mm application, all soils were effective at treating dirty water, reducing concentrations of BOD, MRP and NH4 +- N by ≥ 98% but NO3 −-N concentrations increased up to 80 mg l−1 from the 0.5 m deep lysimeters of the sandy loam over granite. Soils were less effective at reducing levels of BOD, MRP and NH4 +-N at the 8 mm daily rate of application, with maximum NO3 − -N concentrations of leachates of 200 mg l−1 from disturbed soils.