Sewage Sludge Application Effects on Runoff Water Quality in a Semiarid Grassland
1995; Wiley; Volume: 24; Issue: 1 Linguagem: Inglês
10.2134/jeq1995.00472425002400010016x
ISSN1537-2537
AutoresR. L. Harris‐Pierce, Edward F. Redente, K. A. Barbarick,
Tópico(s)Rangeland and Wildlife Management
ResumoAbstract One of the concerns of land application of sewage sludge (also referred to as biosolids ) to rangeland is its effect on the amount and quality of runoff water. In this study, we applied three treatments consisting of 0, 22, and 41 Mg ha −1 of municipal sewage sludge to Larim gravelly sandy loam (Ustollic Arginstoll) and Altvan sandy loam (Aridic Argiustoll) soils in paired plots on two slope gradients (8 and 15%). We used a one‐time application of simulated rainfall for 30 rain at a rate of 100 mm h −1 and collected and analyzed the runoff. We found greater sediment loads in the runoff on 8% slopes due to the larger amount of line soil particles (<2‐mm diam.) in the soil compared with 15% slopes. As sludge rate increased from 0 to 41 Mg ha −1 , decreasing concentrations ( P < 0.05) of Al (0.55–0.26 mg L −1 ) and Fe (0.29–0.15 mg L −1 ) in unfiltered samples of runoff water resulted. Increasing sludge rate from 0 to 41 Mg ha −1 increased ( P ≤ 0.05) sediment (0.5–1.0 g L −1 ), organic N (0.5–25 mg L −1 ), NH 4 ‐N (0.5–76 mg L −1 ), and total Na (6.6–10.4 mg L −1 ), K (4.8–24.8 mg L −1 ), B (0.016–0.70 mg L −1 ), P (0.4–15.8 mg L −1 ), Cu (0.007–0.62 mg L −1 ), Ni (0.006–0.50 mg L −1 ), and Mo (0.005–0.52 mg L −1 ). Concentrations of all measured constituents in the runoff water were less than USEPA standards for drinking water and recommended levels for livestock water.
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