کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
17653 | 42687 | 2008 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Comparison of CSTR and UASB reactor configuration for the treatment of sulfate rich wastewaters under acidifying conditions Comparison of CSTR and UASB reactor configuration for the treatment of sulfate rich wastewaters under acidifying conditions](/preview/png/17653.png)
The effects of lowering the operational pH from 6 to 5 on mesophilic (30 °C) sulfate reduction during the acidification of sucrose at an organic loading rate of 5 gCOD (lreactor d)−1 and at a COD/SO42− ratio of 4 were evaluated in a CSTR and in a UASB reactor. The HRT was 24 h and 10 h, respectively. Acidification was complete in both reactors at pH 6 and the lowering of the operational pH to 5 did not affect the acidification efficiency in the CSTR but decreased the acidification efficiency of the UASB to 72%. The decrease to pH 5 caused an increase in the effluent butyrate and ethanol concentrations in both reactors. Lowering the pH from 6 to 5 caused a decrease in sulfate reduction efficiencies in both reactors, from 43% to 25% in the CSTR and from 95% to 34% in the UASB reactor. The acidification and sulfate reduction efficiencies at pH 5 could be increased to 94% and 67%, respectively, by increasing the HRT of the UASB reactor to 24 h.
Journal: Enzyme and Microbial Technology - Volume 43, Issue 7, 10 December 2008, Pages 471–479