Institute for Infrastructure and Environment, School of Engineering and Electronics, The University of Edinburgh, William Rankine Building, The King’s Buildings, Edinburgh EH9 3JL, Scotland, United Kingdom.
Bioresour Technol. 2010 Oct;101(20):7713-23.
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.
非点源污染，如富含氮的猪场污水的土地扩散，对地表水构成重大威胁。本研究旨在利用四种不同的中尺度综合人工湿地（ICW）系统，种植高丹草，来处理厌氧消化的猪场污水。每个系统使用四个重复，以评估由于养分负荷、水力负荷和出水回流造成的差异。所有系统都能有效去除总有机氮、氨氮、硝酸盐氮和钼酸盐反应性磷。然而，高流速 (>100 m³/ha/d) 对氨氮去除是最大的挑战。夏季硝化作用高于冬季。研究结果首次表明，ICW 内的出水回流有利于降低氨氮，但与更高的运营成本有关。基于氨氮去除的标准、回流、高养分和高流速处理的成本效益比为 1.08:1.04:1.06:1.00。因此，高流速仅略有更高的成本效益。
