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Anaerobic co-digestion of tannery wastes using two stage anaerobic sequencing batch reactor: focus on process performance of hydrolytic–acidogenic step

  • Shifare BerheEmail author
  • Seyoum Leta
ORIGINAL ARTICLE
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Abstract

This study was carried out to optimize the working conditions hydrolytic–acidogenic step of the two stage anaerobic sequencing batch reactor (ASBR) system during anaerobic co-digestion of tannery wastewater (TWW) and tannery solid waste (TSW) under mesophilic temperature (38 ± 2 °C) for enhanced acidification products. For this purposes four laboratory scale digesters with 0.4 L working volume performed in semi-continuous mode operation were used. Four mixing ratios of substrate (100:0, 75:25, 50:50, 25:75) at hydraulic retention time (HRT) of 5, 3 and 1 days and equivalent organic loading rate (OLR) were examined to assess the effect of each operating parameter on process performance of hydrolytic–acidogenic step in the two stage ASBR. The optimized operating conditions obtained in this study for enhanced performance of hydrolytic–acidogenic step were substrate mixing ratio of 50:50, HRT of 5 days, OLR of 1.20 gCOD/L/day and pH of 6.2. The degree of acidification and hydrolysis (%) achieved in the reactor operated at those optimized parameters were 36.55% and 54.8%, respectively. In general anaerobic co-digestion of TWW with TSW is more important than using TWW alone for enhanced acidification products. This is because of the positive synergistic effects of the TSW in terms of well-balanced nutrients and an appropriate C:N ratio.

Keywords

Anaerobic co-digestion Degree of acidification Degree of hydrolysis Tannery solid waste Tannery waste water 

Notes

Acknowledgements

The authors acknowledge Center for Environmental Science College of Natural Science Addis Ababa University for financial support as well as provision of laboratory facilities.

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Copyright information

© Springer Japan KK, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Chemistry Department, College of Natural and Computational SciencesJigjiga UniversityJigjigaEthiopia
  2. 2.Center for Environmental Science, College of Natural and Computational SciencesAddis Ababa UniversityAddis AbabaEthiopia

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