Two-stage UASB design enables activated-sludge free treatment of easily biodegradable wastewater |
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Authors: | Vasileios Diamantis Alexandros Aivasidis |
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Institution: | (1) Department of Environmental Engineering, Democritus University of Thrace, 67100 Xanthi, Greece |
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Abstract: | A two-stage lab-scale UASB reactor, incorporating a selector-type UASB prior to the main reactor was operated at 37 °C with
an easily biodegradable food wastewater having a COD of 3,000 mg/L. Varying the hydraulic retention time from 25 to 5 h, the
removal of COD by the two-stage process was higher than 95%. Effluent soluble COD was consistently below 75 mg/L and the methane
production rate close to theoretical values. The selector UASB removed the majority of the organic load (70–90%) at high organic
loading rate, i.e. between 6 and 30 g/(Ld) and the granular sludge developed was characterized by dense microbial colonies,
high volatile suspended solids’ content and high substrate degradation efficiency. Design of a two-stage process, incorporating
a selector and a second UASB reactor, was able to achieve stable and complete substrate degradation at overall loading rates
of the order of ~10–15 g/(Ld). |
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Keywords: | |
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