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首页> 外文期刊>Journal of Environmental Science and Health >Effect of variations in the nitrogen loading rate and seasonality on the operation of a free water surface constructed wetland for treatment of swine wastewater
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Effect of variations in the nitrogen loading rate and seasonality on the operation of a free water surface constructed wetland for treatment of swine wastewater

机译：氮负荷率和季节变化对自由水面人工湿地处理猪废水的影响

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摘要

The aim of this study was to evaluate the effects of variations in the nitrogen loading rate (NLR) and seasonality on the operational efficiency of a free-water surface constructed wetland (FWS) and on the processes involved in total nitrogen (TN) removal in treating swine wastewater. The system, which operated for 550days, consisted of a FWS mesocosm inoculated with Typha angustifolia L., using swine wastewater from a storage lagoon as an influent. After operating with nitrogen loading rates (NLRs) of 2.0 to 30.2kg TN ha(-1)d(-1), the FWS reduced total nitrogen (TN) concentration by between 21.6 and 51.0%, achieving maximum removal (48.2 +/- 3.0%) when the system operated at a NLR below 15.0kg TN ha(-1)d(-1). Moreover, operations over 25.0kg TN ha(-1)d(-1) resulted in a 50.6% decrease in the maximum FWS efficiency, which may have been related to increased anoxic conditions (< 0.5mg O-2 L-1; -169.8 +/- 70.3mV) resulting from the high concentration of organic matter in the system (12.3 +/- 10.5g TCOD L-1), which hindered nitrification. Ammonia volatilization is considered the main method to remove TN, with an average value of 14.4 +/- 6.5% (3.1-26.2%). Maximum volatilization occurred during the summer (21.5 +/- 2.4 degrees C) at an NLR higher than 25kg TN ha(-1)d(-1) (26.6%), favored by higher temperatures (17.3-19.7 degrees C), and high NH4+-N (>600.0 9mg NH4+-N L-1) and pH levels (7.1-7.9). Uptake by plants accounted for 14.9% of the TN removed, with the vegetative peak in summer (height: 105.3cm; diameter: 2.1cm) at an NLR of 25.3 +/- 0.3kg TN ha(-1)d(-1). However, growth decreased to 94.4% at an NLR of over 25.3 +/- 0.3kg TN ha(-1)d(-1) (>379.9mg NH4+-N L-1) in autumn (17.4 +/- 2.4 degrees C). This was associated with the period of plant senescence and the effects of ammonium phytotoxicity (379.9-624.2mg NH4+-N L-1) and continued to the end of the study with the complete loss of macrophyte species. Finally, 1.5% of the TN removed was incorporated into the sediments where NH4+-N is the main form of nitrogen, with an accumulative value of 2.6g m(-2).
机译：这项研究的目的是评估氮负荷率（NLR）和季节变化对自由水表层人工湿地（FWS）的运营效率以及脱氮过程中总氮（TN）去除过程的影响。处理猪废水。该系统运行了550天，由FWS介观膜组成，该膜接种了香蒲（Typha angustifolia L.），并使用了来自储存泻湖的猪废水作为进水。在以2.0至30.2kg TN ha（-1）d（-1）的氮负荷率（NLR）运行后，FWS将总氮（TN）浓度降低了21.6至51.0％，实现了最大去除量（48.2 +/-当系统在NLR低于15.0kg TN ha（-1）d（-1）时运行时（3.0％）。此外，超过25.0kg TN ha（-1）d（-1）的操作导致最大FWS效率降低了50.6％，这可能与缺氧条件的增加有关（<0.5mg O-2 L-1；-系统中有机物浓度高（12.3 +/- 10.5g TCOD L-1）导致169.8 +/- 70.3mV），这会阻碍硝化作用。氨挥发被认为是去除TN的主要方法，平均值为14.4 +/- 6.5％（3.1-26.2％）。在高于25kg TN ha（-1）d（-1）（26.6％）的NLR下，夏季（21.5 +/- 2.4摄氏度）出现最大挥发，受高温（17.3-19.7摄氏度）的影响，并且高NH4 + -N（> 600.0 9mg NH4 + -N L-1）和pH值（7.1-7.9）。植物吸收的氮占去除的总氮的14.9％，夏季的营养高峰（高度：105.3cm；直径：2.1cm），NLR为25.3 +/- 0.3kg TN ha（-1）d（-1） 。然而，在秋季（17.4 +/- 2.4摄氏度）的NLR超过25.3 +/- 0.3kg TN ha（-1）d（-1）（> 379.9mg NH4 + -N L-1）时，生长下降至94.4％ ）。这与植物衰老期和铵态植物毒性（379.9-624.2mg NH4 + -N L-1）的影响有关，并一直持续到研究结束，大型植物物种完全消失。最后，将被去除的TN的1.5％掺入沉积物中，其中NH4 + -N是氮的主要形式，累积值为2.6g m（-2）。

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