Brookman S K E, Chadwick D R, Headon D M
Institute of Grassland and Environmental Research, North Wyke Research Station, Okehampton, Devon, UK.
Environ Technol. 2002 Mar;23(3):331-43. doi: 10.1080/09593332508618413.
Intact soil blocks with a surface area of 1.8 x 1.6 m, 1.0 m deep, were excavated in a coarse sandy loam. The sides of the soil blocks were supported with plywood before using hydraulic rams to force a steel cutting plate beneath them. Disturbed soil blocks of the same depth as the intact blocks were also established. Experiments were conducted to determine purification efficiencies for biological oxygen demand (BOD), molybdate reactive phosphorus (MRP), nitrate and ammonium-N after the application of dirty water. A preliminary experiment is described where a low application of dirty water was applied to the soil blocks, 2 mm day(-1). In addition, a chloride tracer was conducted for the duration of the experiment. Disturbed soil had a purification efficiency for BOD of 99% compared to 96% from intact soil (P<0.001). Purification efficiencies for MRP and ammonium-N were 100 and 99%, respectively, for the intact and disturbed soils. Nitrate-N concentration increased in leachate from both treatments reaching maximum concentrations of 15 and 8 mg l(-1) from disturbed and intact soils, respectively. Chloride traces for each soil block followed similar patterns with 47 and 51% loss from disturbed and intact soils, respectively.
在粗砂壤土中挖掘出表面积为1.8×1.6米、深1.0米的完整土块。在使用液压千斤顶将钢切割板压在土块下方之前，先用胶合板支撑土块的侧面。还制备了与完整土块深度相同的扰动土块。进行实验以确定施加污水后生物需氧量（BOD）、钼酸盐反应性磷（MRP）、硝酸盐和铵态氮的净化效率。描述了一个初步实验，向土块施加低量污水，即每天2毫米。此外，在实验期间进行了氯化物示踪。扰动土对BOD的净化效率为99%，而完整土为96%（P<0.001）。完整土和扰动土对MRP和铵态氮的净化效率分别为100%和99%。两种处理的渗滤液中硝酸盐氮浓度均升高，扰动土和完整土分别达到最大浓度15毫克/升和8毫克/升。每个土块的氯化物示踪呈现相似模式，扰动土和完整土的损失率分别为47%和51%。
