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模拟盐度变化对人工湿地脱氮除磷效果的影响
赵林丽1, 邵学新2, 吴明2, 姜小三1
1.南京农业大学资源与环境科学学院;2.中国林科院亚热带林业研究所
摘要:
为探究人工湿地处理含盐生活废水的可行性,本研究构建了小尺度的人工湿地模拟系统,比较了不同盐度(0.0%、0.5%、1.0%、1.5%、2.0%)下人工湿地芦苇的生长情况以及几种典型污染物的去除效果。结果表明:①盐度对人工湿地中芦苇生长的影响表现出“低盐促进”、“高盐抑制”的特点,在0.5% 进水盐度下,芦苇有最高株高1.22 m和最大基径0.48 cm;②人工湿地对COD的去除率总体表现为随盐度的升高先升高后降低,在盐度为0.5%时,COD去除率达到最高84.86%;③当进水盐度为0.5% 时,人工湿地对氮磷的去除几乎没有受到盐度的抑制;当进水盐度高于1.0%,随着盐度的升高,TN(总氮)、NH4+-N、NO3--N、TP(总磷)的去除率均显著降低(P<0.05),在2.0% 盐度下分别下降到了44.40%、58.89%、49.23%、49.49%,相较0.0% 盐度时分别降低了38.5%、23.4%、23.8%、19.2%。④不同污染物受盐分抑制程度不同,氮比磷更容易受到盐分的抑制,NH4+-N比NO3--N更容易受到盐分的抑制。
关键词:  人工湿地  盐度  COD    
DOI:10.13758/j.cnki.tr.2019.06.011
分类号:X52
基金项目:浙江省科技计划项目(2015C32011)、浙江省-中国林科院合作林业科技项目(2015SY01)和国家林业公益性行业科研专项(201404305)资助。
Effects of Simulated Salinity Change on Nitrogen and Phosphorus Removal in Constructed Wetland
ZHAO lin-li1, SHAO xue-xin2, WU ming2, JIANG xiao-san1
1.College of Resource and Environmental Science, Nanjing Agricultural University;2.Research Institute of Subtropical Forestry, Chinese Academy of Forestry
Abstract:
In order to explore the feasibility of treating saline wastewater in constructed wetlands, a lab-scale constructed wetland was built to compare the removal effects of several typical pollutants under different salinities (0, 0.5%, 1.0%, 1.5%, 2.0%). The results showed that: 1) The effects of salinity on the growth of Phragmites communis in constructed wetlands showed the characteristics of “low salt promoting” and “high salt inhibiting”. Under 0.5% influent salinity, the reed had the highest plant height (1.22 m) and the maximum basal diameter (0.48 cm); 2) The removal rate of COD in constructed wetlands was generally increased first and then decreased with the increase of salinity. When the salinity was 0.5%, COD removal rate reached a maximum (84.86%). 3) Under 0.5% influent salinity, the removal of nitrogen and phosphorus from the constructed wetland were almost not inhibited by salt; when the influent salinity was higher than 1.0%, the removal of TN, NH4+-N, NO3--N, and TP all decreased significantly (P<0.05) with the increase of salinity. Under 2.0% salinity, the removal of TN, NH4+-N, NO3--N, and TP dropped to 44.40%, 58.89%, 49.23% and 49.49% respectively, compared with 0.0% salinity, decreased by 38.5%, 23.4%, 23.8% and 19.2%, respectively. 4) Under the same influent salinity, different pollutants were inhibited by different salt levels. Nitrogen is more easily inhibited by salt than phosphorus. NH4+-N is more easily inhibited by salt than NO3--N.
Key words:  Constructed wetland  Salinity  COD  Nitrogen  Phosphorus

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