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J Hazard Mater. 2015 Mar 21;285:483-90. doi: 10.1016/j.jhazmat.2014.10.009. Epub 2014 Oct 15.

A new multiple-stage electrocoagulation process on anaerobic digestion effluent to simultaneously reclaim water and clean up biogas.

Author information

1
Biosystems and Agricultural Engineering, College of Engineering, Michigan State University, East Lansing, MI 48824, United States.
2
DQY Agricultural Technology Co. LTD, Beijing 100081, China.
3
Biosystems and Agricultural Engineering, College of Engineering, Michigan State University, East Lansing, MI 48824, United States. Electronic address: liuyan6@msu.edu.

Abstract

A new multiple-stage treatment process was developed via integrating electrocoagulation with biogas pumping to simultaneously reclaim anaerobic digestion effluent and clean up biogas. The 1st stage of electrocoagulation treatment under the preferred reaction condition led to removal efficiencies of 30%, 81%, 37% and >99.9% for total solids, chemical oxygen demand, total nitrogen and total phosphorus, respectively. Raw biogas was then used as a reactant and pumped into the effluent to simultaneously neutralize pH of the effluent and remove H2S in the biogas. The 2nd stage of electrocoagulation treatment on the neutralized effluent showed that under the selected reaction condition, additional 60% and 10% of turbidity and chemical oxygen demand were further removed. The study concluded a dual-purpose approach for the first time to synergistically combine biogas purification and water reclamation for anaerobic digestion system, which well addresses the downstream challenges of anaerobic digestion technology.

KEYWORDS:

Anaerobic digestion; Biogas purification; Electrocoagulation; Nutrient removal; Water reclamation

PMID:
25540943
DOI:
10.1016/j.jhazmat.2014.10.009
[Indexed for MEDLINE]

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