# Innovative Onsite Wastewater Treatment Systems for Nitrogen Removal: A Recirculating Gravel Filter with a Preanoxic Zone and a Recirculating Gravel Filter with a Postanoxic Woodchip Bed

> master's thesis by Crystal Grinnell, University of Washington, 2013

**Wikidata**: [Q111436507](https://www.wikidata.org/wiki/Q111436507)  
**Source**: https://4ort.xyz/entity/innovative-onsite-wastewater-treatment-systems-for-nitrogen-removal-a-recirculating-gravel-filter-with-a-preanoxic-zone-and-a-recirculating-gravel-filter-with-a-postanoxic-woodchip-bed


## References

1. WorldCat