Carbon sequestration in a surface flow constructed wetland after 12 years of swine wastewater treatment.

Constructed wetlands used for the treatment of swine wastewater may potentially sequester significant amounts of carbon. In past studies, we evaluated the treatment efficiency of wastewater in a marsh-pond-marsh design wetland system. The functionality of this system was highly dependent on soil carbon content and organic matter turnover rate.

Effect of polyaluminium chloride on phosphorus removal in constructed wetlands treated with swine wastewater.

Total phosphorus (TP) removal in aged constructed wetlands poses a challenge, especially when treated with swine wastewater with high concentrations of phosphorus (P). Our earlier studies with anaerobic lagoon swine wastewater treatment in constructed wetlands showed a decline in P removal (45-22%) with increased years of operation. These particular wetlands have been treated with swine wastewater every year since the first application in 1997.

Sorption and desorption of ammonium by zeolite: Batch and column studies.

The major objective of this research was to investigate the efficiency of zeolite in the removal of NH(4)-N from swine wastewater and desorption of the sorbed NH(4)-N from the zeolite saturated with N. Sorption experiments were conducted on the sorbents, zeolites I, II and III. Zeolites II and III which are natural and unmodified, showed better sorption (4400-4500 mg kg(-1) with 500 mg L(-1) feed concentration) compared to Zeolite I (3053 ± 127 mg kg(-1) with 500 mg L(-1) feed concentration), which is a surfactant modified zeolite.

Comparison of aerated marsh-pond-marsh and continuous marsh constructed wetlands for treating swine wastewater.

Increased swine production in North Carolina has resulted in greater waste generation and is demanding some emerging new innovative technologies to effectively treat swine wastewater. One of the cost-effective and passive methods to treat swine wastewater is using constructed wetlands. The objective of this study was to evaluate the N removal under two N loads in 3 different wetland systems: aerated marsh-pond-marsh (M-P-M), aerated marsh-covered pond-marsh (M-FB-M), and continuous marsh (CM) with two days drain and five days flood cycle.

Sorption and desorption of phosphorus by shale: batch and column studies.

Constructed wetland systems have gained attention as attractive solutions for wastewater treatment. Wetlands are not efficient to treat wastewater with high concentrations of phosphorus (P). In order to remove high soluble P loads by wetland, sorbent beds can be added prior to the discharge of wastewater into wetlands.