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Title: | Reuse of recalcitrant-rich anaerobic effluent as dilution water after enhancement of biodegradability by Fenton processes |
Authors: | Arimi, Milton M. Zhang, Yongjun Namango, Saul Sitati Geißena, Sven-Uwe |
Keywords: | Vinasse Coagulation Oxidation Melanoidin |
Issue Date: | 2016 |
Publisher: | Elsevier |
Abstract: | Anaerobic digestion is used to treat effluents with a lot of organics, such as molasses distillery wastewater (MDW) which is the effluent of bioethanol production from molasses. The raw MDW requires a lot of dilution water before biodigestion, while the digested MDW has high level of recalcitrants which are problematic for its discharge. This study investigated ferric coagulation, Fenton, Fenton-like (with ferric ions as catalyst) processes and their combinations on the biodegradability of digested MDW. The Fenton and Fenton-like processes after coagulation increased the MDW biodegradability defined by (BOD5/COD) from 0.07 to (0.4–0.6) and saved 50% of H2O2 consumed in the classic Fenton process. The effluent from coagulation coupled to a Fenton-like process was used as dilution water for the raw MDW before the anaerobic digestion. The process was stable with volumetric loading of approx. 2.7 g COD/L/d. It resulted in increased overall biogas recovery and significantly decreased the demand for the dilution water. |
URI: | https://doi.org/10.1016/j.jenvman.2015.11.040 http://ir.mu.ac.ke:8080/jspui/handle/123456789/5122 |
Appears in Collections: | School of Engineering |
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