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The Study of Several Aquatic Plants Ecological Restoration in City Sewage Eutrophication

Author: ChiCheng
Tutor: LongYueLin
School: Hunan Agricultural University
Course: Ornamental Horticulture
Keywords: Aquatic plants Purification Eutrophication
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 146
Quote: 1
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Abstract


In this paper, on the basis of the Bao'an District, Shenzhen Tong Tau River near aquatic plant resources survey, Canna (canna indica), the dry umbrella grass (Cyperus alternifolius), vetiver (Vetiveria), mosaic Ludi (Arundo donax var. versicolor) then force flower (Thalia dealhata), with certain ornamental value the local advantages aquatic plants as experimental material, experiments were carried out. Mainly analyzes the purification of urban sewage treatment capacity of these five kinds of aquatic plants, to explore the relationship between the purification capacity of these aquatic plants with chlorophyll content and biomass. Through surveys and experiments the following conclusions: (1) dry umbrella grass, and then force flower mosaic Ludi, canna and vetiver eutrophic water body are obvious purification. Varying degrees of decline in the total nitrogen concentration in the the eutrophic water plant these five species, each treatment. After adaptive growth for 5 consecutive days beginning of the experiment the first two days of each experimental wetland treatment total nitrogen concentration decreased rapidly, reaching 80% of the dagger, after the three-day decline in total nitrogen concentration is relatively stable. Two experiments the temperature difference, resulting in a certain deviation from the previous two days repairing effect, but little change in the downward trend of the total nitrogen. The five species of the total nitrogen removal rate of increase over time, the total nitrogen removal rate is gradually increased. Mixed planting wetland removal to be better than any other single planting. Five species of ammonia removal significantly in the first day of the experiment, we can achieve 95% of the dagger, the temperature of the plant have little effect on the removal of ammonia, after long-term growth, mixed planting wetland performance removal of ammonia best effect (2) in January 2008, the five species of wetland on the first day of the total phosphorus removal are more than 70%, compared with the normal temperature in October 2007, the results of the experiment 90% with a certain distance, but in the 5-day continuous repair process, the removal efficiency began to slowly close to room temperature removal. The overall trend growth over time, total phosphorus removal rate was gradually increased. Mixed planted wetlands and mosaic, Ludi wet demonstration of total phosphorus removal. The first day of the two experiments total phosphorus removal, blank contrast, less than 65%. Have a significant effect of temperature on plant total phosphorus removal. (3) 5 species of plants in the low COD environment, COD removal, the first day of the experiment COD value of 20mg / L or less, and then four days of basic maintenance, changed little. The mixed planting wetlands and the single plant wet areas no significant difference. (4) plants chlorophyll content variation: Average increased rapidly at first, and then declined slightly, then smooth recovery. Flower and vetiver then force after the winter, as temperatures drop, the yellow leaves, resulting in the two plant chlorophyll content is not high, reduce photosynthesis. Variation in growth to be significantly affected repair effect of sewage pollution indicators.

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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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