Construction of disturbed and intact soil blocks to develop percolating soil based treatment systems for dirty water from dairy farms

被引:5
作者
Brookman, SKE [1 ]
Chadwick, DR [1 ]
Headon, DM [1 ]
机构
[1] Inst Grassland & Environm Res, N Wyke Res Stn, Okehampton EX20 2SB, Devon, England
关键词
soil blocks; dirty water; lysimeters; purification efficiency; chloride tracer;
D O I
10.1080/09593332508618413
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
收藏
页码:331 / 343
页数:13
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