کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
681607 | 1460034 | 2012 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Lower operational limits to volatile fatty acid degradation with dilute wastewaters in an anaerobic fluidized bed reactor Lower operational limits to volatile fatty acid degradation with dilute wastewaters in an anaerobic fluidized bed reactor](/preview/png/681607.png)
A general concern that anaerobic treatment of dilute wastewaters is limited by the inability of methanogenic and related syntrophic organisms to reduce substrate concentrations adequately was evaluated using a 35 °C granular activated carbon-containing laboratory-scale fluidized bed reactor fed an acetate-propionate equal chemical oxygen demand (COD) mixture synthetic wastewater. Contrary to general expectations, effluent acetate and propionate concentrations remained near or below their detection limits of 0.4 mg COD/L with influent COD of 200 mg/L, 17 min hydraulic retention time, and organic loading as high as 17 kg COD/m3 d, or with influent COD values ranging from 45 to 2010 mg COD/L and organic loadings of 4.2–4.5 kg COD/m3 d. The effluent acetate concentrations in these well-fed systems were at or much below reported threshold limits for starving non-fed cultures, suggesting that a better understanding of threshold values and factors affecting treatment efficiency with anaerobic treatment of dilute wastewaters is needed.
► We evaluated an anaerobic fluidized bed reactor fed acetate and propionate.
► Effluent acetate and propionate unexpectedly below reported threshold values.
► Concentrations below 0.4 mg COD/L detection limits.
► Detection limits not exceeded with 252 mg/L COD feed and 17 kg COD/m3 d.
► Hypotheses for low values include adaptation and plug-flow reactor operation.
Journal: Bioresource Technology - Volume 109, April 2012, Pages 13–20