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Coastal Tourism and Its Influence on Wastewater Nitrogen Loading: A Barrier Island Case Study
Environmental Management ( IF 3.5 ) Pub Date : 2019-08-23 , DOI: 10.1007/s00267-019-01201-7
Michael O'Driscoll 1 , Eban Bean 2 , Robert N Mahoney 3 , Charles P Humphrey 4
Affiliation  

Package treatment plants (PTPs) are facilities designed to treat onsite wastewater for small communities, commercial, and residential developments. PTPs are being utilized in a growing number of coastal communities. This study estimated the effects of coastal tourism on onsite wastewater nitrogen (N) inputs to a barrier island surficial aquifer (Bogue Banks, NC). The N-removal effectiveness was assessed for seven PTPs that treated wastewater from vacation properties using a range of technologies: extended aeration; sequencing batch reactor; and advanced media filtration. Influent and effluent wastewater samples were collected monthly from Feb. 2014 to Jan. 2015 and analyzed for particulate and dissolved N. Increased summer visitation associated with coastal tourism resulted in an increase in water use, wastewater inputs, and PTP N loading to the surficial aquifer. However, extended aeration systems did not have significantly elevated TN loads during the summer months because their treatment efficiency increased. N inputs associated with coastal tourism made up approximately 51% of the annual wastewater-related N load to the surficial aquifer. Onsite wastewater N-loading to the surficial aquifer (6.7 kg-N/ha/yr) appeared to be the dominant source of N loading on the island. Water quality data indicated that these N inputs have resulted in increased groundwater NO3 concentrations in the surficial aquifer. Overall, wastewater inputs added approximately 4.6 cm of groundwater recharge annually to the island. Coastal tourism can result in measurable increases in wastewater N loading, groundwater nitrogen concentrations, and groundwater recharge.

中文翻译:

沿海旅游及其对废水氮负荷的影响:一个屏障岛案例研究

成套处理厂 (PTP) 是设计用于处理小型社区、商业和住宅开发的现场废水的设施。越来越多的沿海社区正在使用 PTP。本研究估计了沿海旅游对屏障岛地表含水层(北卡罗来纳州博格班克斯)的现场废水氮 (N) 输入的影响。评估了七个 PTP 的除氮效果,这些 PTP 使用一系列技术处理度假物业的废水:延长曝气;序批式反应器;和先进的介质过滤。从 2014 年 2 月到 2015 年 1 月,每月收集进水和出水废水样本,并分析颗粒和溶解的氮。与沿海旅游相关的夏季游客增加导致用水量、废水输入、和 PTP N 加载到地表含水层。然而,扩展曝气系统在夏季月份并没有显着提高 TN 负荷,因为它们的处理效率提高了。与沿海旅游相关的氮输入约占地表含水层每年废水相关氮负荷的 51%。表层含水层的现场废水氮负荷(6.7 kg-N/ha/yr)似乎是岛上氮负荷的主要来源。水质数据表明,这些氮输入导致地表含水层中地下水 NO3 浓度增加。总体而言,废水输入每年为该岛增加了大约 4.6 厘米的地下水补给。沿海旅游可导致废水含氮量、地下水含氮浓度和地下水补给量的显着增加。扩展曝气系统在夏季月份没有显着升高 TN 负荷,因为它们的处理效率提高了。与沿海旅游相关的氮输入约占地表含水层每年废水相关氮负荷的 51%。表层含水层的现场废水氮负荷(6.7 kg-N/ha/yr)似乎是岛上氮负荷的主要来源。水质数据表明,这些氮输入导致地表含水层中地下水 NO3 浓度增加。总体而言,废水输入每年为该岛增加了大约 4.6 厘米的地下水补给。沿海旅游可导致废水含氮量、地下水含氮浓度和地下水补给量的显着增加。扩展曝气系统在夏季月份没有显着升高 TN 负荷,因为它们的处理效率提高了。与沿海旅游相关的氮输入约占地表含水层每年废水相关氮负荷的 51%。表层含水层的现场废水氮负荷(6.7 kg-N/ha/yr)似乎是岛上氮负荷的主要来源。水质数据表明,这些氮输入导致地表含水层中地下水 NO3 浓度增加。总体而言,废水输入每年为该岛增加了大约 4.6 厘米的地下水补给。沿海旅游可导致废水含氮量、地下水含氮浓度和地下水补给量的显着增加。
更新日期:2019-08-23
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