Journal
BIORESOURCE TECHNOLOGY
Volume 205, Issue -, Pages 75-81Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.01.021
Keywords
Anaerobic digestion; Effluent recirculation; Chicken manure; Air stripping; Ammonium inhibition
Funding
- Beijing Nova Program [2015B083]
- National Twelfth Five-Year Plan for Science AMP
- Technology Support [2015BAD21B04]
- Beijing Science and Technology Program [Z151100001115010]
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The dynamics of ammonium accumulation and mitigation control in anaerobic digestion of chicken manure under the recycled utilization of liquid digested slurry were investigated by using an integrated approach in two laboratory-scale semi-continuously stirred tank reactors. In the reactor with direct recycled utilization of the anaerobic digested liquid slurry, total volatilized fatty acids (in CH3COOH) and NH4+-N increased from 1600 mg/L to 8000 mg/L and from 2600 mg/L to 5000 mg/L, respectively. The daily volumetric biogas production decreased from 1.4 +/- 0.1 L/(L.d) to 0.8 +/- 0.1 L/(L.d) with a reduction efficiency of 43 +/- 4%. Air stripping was integrated for ammonium mitigation of recycled liquid digested slurry and was shown to effectively reduce the ammonium to 3000 mg/L. Correspondingly, the biogas production was recovered back to 1.4 +/- 0.1 L/(L.d). This indicated the potential of the integration of air stripping for ammonium mitigation in an anaerobic digestion process with liquid digested slurry recirculation. (C) 2016 Elsevier Ltd. All rights reserved.
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