Fate of organics in sewage effluent during soil aquifer treatment in soil columns
PublisherThe University of Arizona.
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AbstractUnsaturated soil column experiments were performed to 1) differentiate biological and abiotic mechanisms for removal of dissolved organics in chlorinated municipal effluent and 2) determine efficacy of additional effluent pre-treatments (tertiary filtration and ozonation) during soil aquifer treatment (SAT). Three water quality parameters were examined: dissolved organic carbon (DOC), UV absorbance at 254 nanometers (UV A254), and adsorbable organic halide (AOX). DOC was removed primarily by biological activity during SAT. The average through-column removal using chlorinated secondary effluent was 48 %. UVA254 removals were dependent on both biological and abiotic mechanisms. AOX was removed primarily by sorption. Average removals for UV A254 and AOX were 30 and 17 %, respectively. Forty-four percent of the through column DOC removal and 57 % ofUVA254 attenuation occurred in the top 8 cm of soil. Tertiary filtration and pre-ozonation provided no significant additional water organic quality benefits following SAT.
Degree ProgramGraduate College
Hydrology and Water Resources