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Alum application to improve water quality in a municipal wastewater treatment wetland: Effects on macrophyte growth and nutrient uptake

机译:应用明矾改善市政污水处理湿地的水质:对大型植物生长和养分吸收的影响

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摘要

Application of low doses of alum to treatment wetlands to reduce elevated outflow winter phosphorus concentrations were tested in mesocosms vegetated with either Typha domingensis, Schoenoplectus cali-fornicus, or submerged aquatic vegetation (SAV) (Najas guadalupensis-dominated). Alum was pumped to experimental units at a rate of 0.91 g Al m~(-2) d~(-1) and water quality monitored for 3 months. The alum application significantly improved the outflow water quality and overall the growth of the plants was unaffected by the alum application. Biomass and growth varied between species and through time, but no significant effects of alum application were detected. The concentrations of nutrients and mineral elements in the aboveground tissues differed between species and over time, but only the concentration of Al in plant tissue was increased by alum additions. The concentration of Al was 50-fold higher in alum-treated SAV as compared to the control, and in Typha and Schoenoplectus the concentrations were 4- and 2-fold, higher, respectively. The N/P ratios in the plant tissues were low (<10) suggesting that their growth and biomass was limited by nitrogen. The research suggests that a continuous or seasonal low-dosage alum application to treatment wetlands provides an effective tool to maintain discharge concentrations within permitted values during the inefficient winter treatment times. We suggest that the use of alum should be restricted to treatment wetland areas dominated by emergent vegetation as the effects of the elevated Al concentrations in SAV needs further study.
机译:在以香蒲,香蒲或水下水生植物(SAV)(Najas guadalupensis为主)的植被中,测试了低剂量明矾在处理湿地中的应用,以减少冬季磷的流出量升高。将明矾以0.91 g Al m〜(-2)d〜(-1)的速度泵送到实验装置,并监测水质3个月。明矾施用显着改善了流出水的质量,并且整个植物的生长不受明矾施用的影响。生物质量和生长随物种和时间的变化而变化,但未发现施用明矾的显着影响。不同物种之间地上组织中养分和矿物质元素的含量随时间的推移而有所不同,但是通过添加明矾仅增加了植物组织中的Al浓度。与对照相比,经明矾处理的SAV中Al的浓度高50倍,而在香蒲和Schoenoplectus中,Al的浓度分别高4倍和2倍。植物组织中的N / P比很低(<10),表明它们的生长和生物量受到氮的限制。研究表明,连续或季节性使用低剂量的明矾来处理湿地提供了一种有效的工具,可以在效率低下的冬季处理时间内将排放浓度保持在允许的范围内。我们建议将明矾的使用限制在以新兴植被为主的湿地地区,因为SAV中Al浓度升高的影响需要进一步研究。

著录项

  • 来源
    《Chemosphere》 |2010年第2期|p.186-192|共7页
  • 作者单位

    Soil & Water Science, University of Florida, Gainesville, FL 32611, USA;

    Wetland and Aquatic Biogeochemistry Lab., Department of Oceanography & Coastal Sciences, School of the Coast & Environment, Louisiana State University, Baton Rouge, LA 70803, USA;

    Department of Biological Sciences, Aarhus University, Dk-8000 Arhus, Denmark;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    aluminum; constructed wetland; najas; phosphorus; schoenoplectus; typha;

    机译:铝;人工湿地;眼镜蛇磷;听力伤寒;

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