Treatment of separated piggery anaerobic digestate liquid using woodchip biofilters Carney, K. N. ; Rodgers, M. ; Lawlor, P. G. ; Zhan, X. Abstract Publication: Environmental Technology Pub Date: March 2013 DOI: 10.1080/09593330.2012.710408 Bibcode: 2013EnvTe..34..663C