Study on Biological Purification Effect on Tail Water from Sewage Treatment Plant at Small-Scaled Town, South Jiangsu

Abstract:

As a cost-effective technology, using biological treatment technology to treat tail water has been gradually promoted in and abroad. Biological treatment technology uses the organic combination of water ecosystem to remove the organic pollutants and pollutants such as N and P which cause water eutrophication. This paper takes Jiangyin City Xinqiao Town Sewage Treatment Plant as example to construct bio-ecological combined constructed wetlands system near natural river course to treat tail water from sewage treatment plant and investigates the removal efficiency of combination process for COD, ammonia, TN and TP in tail water. The research indicates that bio-ecological combined constructed wetlands system has good removal efficiency for pollutants in tail water. And the average removal rate of COD, ammonia, TN and TP are 29%, 31%, 18%, and 8%; the average effluent concentration of them are 35.54mg/L, 0.97mg/L, 10.77 mg/L, and 0.11 mg/L. The result exactly matches the first grade A standard of Urban Sewage Treatment Plant Pollutant Discharge Standard (GB18918-2002). It has great potential for tail water treatment and is suitable for rural regions. The research result provides both the data and theoretical basis for improvement of biological treatment technology of tail water from sewage treatment plant, and also provides direct theoretical basis and practical experience for promotion and research of wetlands ecosystem.

• Periodical: Applied Mechanics and Materials (Volumes 641-642)
• Pages: 384-389
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.641-642.384
• Online since: September 2014
• Authors: Rui Wu, Li Gang Xu*, Dan Chen
• Keywords: Bio-Ecological Combination Process, Constructed Wetland, Removal Rate, Tail Water

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