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United States Department of Agriculture

Agricultural Research Service

Title: Treatment of Swine Wastewater in Marsh-Pond-Marsh Constructed Wetlands

Authors
item Reddy, G - NC A&T STATE UNIV.
item Hunt, Patrick
item Phillips, Richard - NC A&T STATE UNIV.
item Stone, Kenneth
item Grubbs, Anthony - NC A&T STATE UNIV.

Submitted to: International Conference on Wetland Systems for Water Pollution Control
Publication Type: Proceedings
Publication Acceptance Date: July 15, 2000
Publication Date: N/A

Technical Abstract: Swine waste is commonly treated in the USA by flushing into an anaerobic lagoon and subsequently applying to land. This natural system type of application has been part of agricultural practice for many years. However, it is currently under scrutiny by regulators. An alternate natural system technology to treat swine wastewater may be constructed wetland. For this study we used four wetland cells (11-m width x 40-m length) with a marsh-pond-marsh design. The marsh sections were planted to cattail (Typha latifolia, L.) and bulrushes (Scirpus americanus). Two cells were loaded with 16 kg N/ha/day with a detention of 21 days. They removed 51% of the added N. Two additional cells were loaded with 32 kg/ha/day with 10.5 days detention. These cells removed only 37% of the added N. However, treatment operations included cold months in which treatment was much less efficient. Removal of N was moderately correlated with the temperature. During the warmer periods, removal efficiencies wer more consistent with the high removal rates reported for continuous marsh systems - often > than 70%. Phosphorus removal ranged from 30 to 45%. Aquatic macrophytes (plants and floating) assimilated about 320 and 35 kg/ha, respectively, of N and P.

Last Modified: 4/19/2014
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