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Study on Multiple Constructed Wetland System for Treatment Wastewater

Author: LiJianNa
Tutor: HuYueLi；WuXiaoZuo
School: Central South University of Forestry Science and Technology
Course: Environmental Science
Keywords: Combination of artificial wetlands Sewage treatment Removal Seasonal changes Nitrogen Phosphorus Absorbed by plants Contribution rate
CLC: X703
Type: Master's thesis
Year: 2007
Downloads: 123
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Abstract


In a lot of reading existing wetland system literature and research results, based on the review wetland sewage treatment technology research progress, analyzing artificial wetlands in the promotion and application challenges proposed wetland modification research ideas. This study is based Central South Forestry University to build a combination of artificial wetland model, mainly for the combination of wetland sewage treatment system purification effect and its seasonal and interannual variations in-depth research and analysis; pair combined system of each unit's contribution and seasonal change on the decontamination unit to analyze the impact; absorbed by plants in the system acts on denitrification, phosphorus contribution in the process of discussion and research; its purpose is to make the technology has been further improved for future wetland projects Design and operation management provide a theoretical basis and practical experience. Combination treatment wetland system on campus sewage findings indicate that: the system for each sewage contaminants have obvious purification effect, even at low temperatures, plant growth stops, microbial activity is very low in the winter, the system removes most contaminants rate is still above 60%. Combinations of system units decontamination decontamination capabilities and their contribution to the system will be a difference changes with the seasons, but the combination of temperature change on seasonal wetland sewage treatment system's overall processing efficiency was less affected. Aerobic biochemical pool and constructed wetland biggest role were assumed CODcr, TN and TP removal, biological regulation pool for each pollutant removal ability of the smallest, but the effect can not be ignored. System ecological structure is formed between the complementary roles of each unit internal factors. System of plant research showed that: the system introduced plants are growing well, has a certain landscape effect. Different plant N, P content have some differences, and in the same habitat, different plant biomass were significantly different. Plant N, P accumulation and plant biomass between displays a significant positive linear correlation coefficient (R2) were 0.8934 and 0.7887; plant N, P accumulation and plants N, P content also showed a positive linear relationship, but poor correlation, the correlation coefficient (R2) were 0.4996 and 0.4850. Each unit plant uptake of N, P removal contribution rate and unit influent loading related results show that plants of N, P uptake at low load system occupies a significant advantage, surface flow wetland unit plant uptake of N, P removal higher than the contribution of biological regulation pool and subsurface flow wetland two units. In this combined system for plant uptake unit N, P removal only play a limited role in its contribution rate of 2% -10%.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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