Treatment of separated piggery anaerobic digestate liquid using woodchip biofilters

@article{Carney2013TreatmentOS,
  title={Treatment of separated piggery anaerobic digestate liquid using woodchip biofilters},
  author={K N Carney and Michael Rodgers and Peadar G. Lawlor and Xinmin Zhan},
  journal={Environmental Technology},
  year={2013},
  volume={34},
  pages={663 - 670}
}
The Irish nitrates directive restricts the land area suitable for landspreading of pig manure, so anaerobic digestion warrants consideration. In this study, six identical Lodgepole pine woodchip biofilters were set up to treat the separated liquid fraction of digestate after anaerobic digestion of pig manure. Two hydraulic loading rates were examined: 5 L/ m 2/d (LLR) and 10 L/ m 2/d (HLR). Following a start-up period of 70 days, an average of 90% and 71% of -N was removed at LLR and HLR… 
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