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Title page for ETD etd-01092005-001638

Type of Document Master's Thesis
Author Lyerly, Courtney Neil,
Author's Email Address Courtly52@hotmail.com
URN etd-01092005-001638
Title SWINE WASTEWATER TREATMENT IN AN INTEGRATED SYSTEM OF ANAEROBIG DIGESTION AND DUCKWEED NUTRIENT REMOVAL: PILOT STUDY
Degree Master of Science
Graduate Program Biological and Agricultural Engineering
Advisory Committee
Advisor Name Title
Jiayang Cheng Committee Chair
Francis de los Reyes Committee Member
Sarah Liehr Committee Member
Keywords
  • Nitrogen
  • Nutrient removal
  • Phosphorous
  • Swine wastewater treatment
  • Ammonium
  • Anaerobic digester
  • Duckweed
  • Lemna gibba
  • Spirodela punctata
  • Lemna Minor
Date of Defense 2004-07-09
Availability unrestricted
Abstract
Organics destruction and nutrient uptake in an integrated pilot system of

anaerobic digestion and duckweed nutrient removal for swine wastewater treatment were

monitored under field conditions. Raw swine wastewater of 100 gallons/day was first

treated in a 1,000-gallon anaerobic digester with floating ballast rings. Organic

compounds in the wastewater were digested to produce biogas. Many nutrients including

nitrogen and phosphorus remain in the effluent of the anaerobic digester. Three

duckweeds (Lemna gibba 8678, Lemna minor 8627, and Spirodela, punctata 7776) were

grown in three 1,000- gallon tanks to recover nutrients from the anaerobic effluent. The

duckweed was periodically harvested and can be used as animal, poultry, and fish feed.

The Three species were compared for growth and nutrient removal characteristics. This

research provides an initial understanding of the attached-growth anaerobic digester and

the characteristics exhibited by duckweed in the treatment of swine wastewater under

conditions similar to those found in North Carolina. Both the anaerobic digester and the

duckweed tanks were run as completely mixed systems. The performance of the system

was monitored by measuring chemical oxygen demand (COD), total Kjeldahl nitrogen

(TKN), ammonia nitrogen, total phosphorus (TP), ortho-phosphate-phosphorus, and pH

in the influent and effluent of each treatment unit.
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