Performance of Different Constructed Wetland Substrates on Nitrogen and Phosphorous AdsorptionReport as inadecuate




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Substrate is an important component of constructed wetlands, playing an significant role in the purification of nitrogen and phosphorous. The nitrogen and phosphorus adsorption properties of four substrates,including lytag, gravel, clinoptilolite and carpolite, were studied through the basic experiments. Freundlich model and Langmuir model were used to fit adsorption isotherm equation experimental results, revealing that in terms of G0 with ammonia nitrogen adsorption, clinoptilolite > lytag > gravel > carpolite; and in terms of G0 with phosphorus adsorption, lytag > carpolite > clinoptilolite > gravel. The precipitation experiments carried out after substrate adsorption saturation revealed that the ammonia nitrogen adsorbance of clinoptilolite was large, its adsorption efficiency was high and the precipitation quantity after saturation was low; while the phosphorus adsorbance of lytag was large and the percentum of precipitation was low. The results revealed that the precipitation of nitrogen and phosphorus occurred in the four substrates, which may lead to the secondary pollution of water bodies.

KEYWORDS

constructed wetland; substrate; nitrogen and phosphorous; adsorption

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Author: Xuwen He, Hao Wang, Hui Lin, Zhen Chai, Yue Zhang, Liyuan Liu, Jianli Jia, Jianbing Wang

Source: http://www.scirp.org/



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