Assessment of pre-digested piggery wastewater treatment operations with surface flow integrated constructed wetland systems
Harrington, C and Scholz, M 2010, 'Assessment of pre-digested piggery wastewater treatment operations with surface flow integrated constructed wetland systems' , Bioresource Technology, 101 (20) , pp. 7713-7723.
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Non-point source pollution such as land-spreading of nitrogen-rich piggery wastewater poses a significant threat to surface waters. The aim was to examine the treatment of anaerobically digested piggery wastewater using four different meso-scale integrated constructed wetland (ICW) systems planted with Glyceria maxima. Four replicates were used for each system to assess differences due to nutrient loading, hydraulic loading and effluent recycling. All systems were effective in removing total organic nitrogen, ammonia-nitrogen, nitrate-nitrogen and molybdate reactive phosphorus. However, ammonia-nitrogen removal was the greatest challenge for high flow rates (>100 m3/ha/d). Nitrification was higher in summer than winter. Findings show for the first time that effluent recycling within ICW was beneficial to lower ammonia-nitrogen but was associated with higher operational costs. The cost–benefit ratio based on ammonia-nitrogen removal for standard, recycling, high nutrients and high flow rate treatments was 1.08:1.04:1.06:1.00. It follows that a high flow rate was only marginally more cost-effective.
|Themes:||Subjects outside of the University Themes|
|Schools:||Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Civil Engineering Research Centre|
|Journal or Publication Title:||Bioresource Technology|
|Depositing User:||Users 29196 not found.|
|Date Deposited:||30 Jan 2012 11:38|
|Last Modified:||30 Jan 2012 11:38|
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