Nutrient removal of a floating plant system receiving low- pollution wastewater: Effects of plant species and influent concentration

[摘要] Plant floating bed was adopted in this study to compare the purification effect of four plant species (Oenanthe javanica, Ipomoea aquatica, Hydrocotyle vulgaris, and Iris sibirica) receiving high and low treated domestic sewage. The experiment was conducted for eight months during the low temperature season. The results indicated that the average removal rates of TN and NH4+-N in I. aquatica floating bed were relatively high both under high and low influent concentration during the first stage of the experiment. During the second stage, H. vulgaris showed the best performance for nitrogen treatment, and the average removal rates of TN were 70.7% and 87.7% under high and low influent concentration, while the average removal rates of NH4+-N were as high as 98.9% and 98.9%, accordingly. Moreover, H. vulgaris contributed most for plant assimilation to nitrogen removal among different plant floating systems. It was also found that the existence of hydrophytes effectively controlled the rise of water pH value and algae growth and reproduction, which helped to improve the aquatic environment. The results provide engineering parameters for the future design of an ecological remediation technology for low-pollution wastewater purification.

[发布机构] Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing; 210014, China^1

[效力级别] 生物科学

[关键词] Aquatic environments;Ecological remediation;Engineering parameters;Influent concentrations;Low temperatures;Nitrogen treatment;Purification effect;Wastewater purification