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

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.