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The impact of treated wastewater and biosolids from the municipal wastewater treatment plant on water and carbon dioxide effluxes from soils
Summary
Researchers measured water and CO2 effluxes from Cambisol and Arenosol soils amended with stabilized or composted sewage sludge or irrigated with treated wastewater over a growing season, finding that sewage sludge amendments significantly increased CO2 emissions while treated wastewater irrigation had negligible effect on either CO2 or water efflux, which was primarily governed by plant canopy cover.
Abstract The goal of this study was to evaluate the effect of products from a municipal wastewater treatment plant on the H 2 O and CO 2 effluxes from two soils. The net H 2 O and CO 2 effluxes were measured at the surface of nine beds with two different soils (Cambisol and Arenosol) and two crops (maize or vegetables). Soils in some beds were amended with stabilized sewage sludge (bed with Cambisol and maize) or composted sewage sludge (two beds with Cambisol and both crops) or were irrigated with treated wastewater (two beds with Cambisol and both crops, and one bed with Arenosol and vegetable). Remaining beds were irrigated with tap water (two beds with Cambisol and both crops, and one bed with Arenosol and vegetable). While stabilized and composted sewage sludge positively affected the CO 2 emission, the effect of treated wastewater was not confirmed. Different treatments had negligible effect on the water efflux, which was mainly affected by the plant canopy that influence the temperature of the soil surface. Statistical analyses showed that trends of the CO 2 efflux with respect to various scenarios measured on different days changed during the season. No significant correlations were found between the average H 2 O and CO 2 effluxes and measured soil properties.