Abstract
<abstract> <b><i>Abstract. </i></b> High strength wastewater can be effectively treated with sand bioreactors. Fats, oils, grease, and large, slowly degradable solids can clog the sand. The goal of this study was to compare sand bioreactor design by using either layers of coarse sand with pea gravel or layers of textile chips for wastewater pretreatment. Influent turkey processing wastewater varied from 840-3,920 mg COD L<sup>-1</sup> and 463-2,260 mg BOD<sub>5</sub> L<sup>-1</sup> was applied at 66 L m<sup>-2</sup> day<sup>-1</sup> (1.63 gal ft<sup>-2</sup> day<sup>-1</sup>). The bioreactors reached >95% and >99% removal of COD and BOD<sub>5</sub>, respectively, within one month of operation. Clogging tests were performed on sand/gravel and sand/textile bioreactors after 15 and 19 months of operation. Results indicated 30% to 40% filter clogging and this did not affect BOD<sub>5</sub> and COD removal negatively in the bioreactors. The bioreactors operated successfully for a total of 25.8 months before the experiment was terminated.
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