| Summary: | 碩士 === 崑山科技大學 === 環境工程研究所 === 101 === In this study, mangrove plants and aquatic plants diluted and purified the effluent of industrial sewage treatment plant. According to the results of the laboratory cultivation, the highest salt storage of the plant was different. The salt accumulation of the Avicennia was 71.3 mg per gram with 50‰ ambient salinity. That of the Rhizophora was 67.9 mg with 25‰ ambient salinity. That of the Kandelia was 52.1 mg with 25‰ ambient salinity. That of the Lumnitzera was 46.8 mg per gram with 35‰ ambient salinity. And the salt accumulation of the Canna was 30.6 mg per gram with 20‰ salinity. Close to the ambient salinity of the ecological pool (7-10‰), the salt accumulation of per gram dry weight of the Avicennia, the Rhizophora, the Kandelia, the Canna, the Lumnitzera sequenced to 46 mg, 32.5 mg, 27.8 mg, 22.6 mg, 21.1 mg. About the salt tolerability of the plant, Kandelia and Canna only resistanced to 30‰ and 20‰ ambient salinity, Rhizophora was at least up to 45%, Avicennia and Lumnitzera were at least up to 50‰. The salt accumulation in various parts of the plant under test was mostly in the leaves. We could see the mangrove plants and aquatic plants in order to remove too much salt falling by the old leaves, and it could dilute the salinity of the water. According to the results of the ecological pool cultivation, the salinity of the water was about to maintain 7%. The interval between the first and the second detection time was 6 months, and the salt accumulation of per gram dry weight in the plant was 13.3-37.7 mg of Avicennia, 17.4-26.8 mg of Rhizophora, 6.4-17.1 mg of Lumnitzera, 10.6-14.9 mg of Canna, 15.7-20.3 mg of Typha angustifolia, 17.1-20.6 mg of The umbrella round of sedge. Under the same ambient salinity, with the increase of growth time, the salt accumulation of the plants did not continue to increase, while showing the amount of saturation.
While the ambient salinity increased, the salt of the stems of Avicennia, Kandelia, Lumnitzera, and Canna increased the smallest, the salt of the leaves increased the largest. When per unit increased in salinity (‰) , per gram dry weight of the salt of the stem increased to 0.27-0.97 mg, per gram dry weight of the leaf increased to 1.34-3.71 mg, per gram dry weight of the root increased to 0.51 -1.28 mg. The per gram dry weight of the root, the stem, the leaf of Rhizophora was 4.02 mg,1.91 mg, 0.45 mg.
The average nitrogen content of the whole plant of Avicennia was 1.59%, Rhizophora was 0.79%, Lumnitzera was 0.69%, Canna was 2.60%, Typha angustifolia was 1.61%, The umbrella round of sedge was 2.71%；The average phosphorus content of the whole plant of Avicennia was 0.04%, Rhizophora was 0.06%, Lumnitzera was 0.04%, Canna was 0.09%, Typha angustifolia was 0.10%, The umbrella round of sedge is 0.09%. Among the three mangrove, the highest nitrogen content was 1.59% of Avicennia, the highest phosphorus content was 0.06% of Rhizophora. The highest nitrogen content of all the measured plants was 2.71% of the umbrella round of sedge and the highest phosphorus content was 0.10% of Typha angustifolia.
About the oxidized drainage of the ecological pool, the ammonium nitrogen removal rate was 3.0%, the nitrate nitrogen removal rate was 0.8%. It is not significant to the nitrogen removal performance. The phosphate removal rate was 4.7%, and the effect of phosphorus removal was not significant.The Zinc removal rate of approximately was 0.7%.
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