本文選題：再生水 + 鹽度��； 參考：《西安建筑科技大學(xué)》2017年碩士論文

【摘要】：景觀水體富營養(yǎng)化控制一直是景觀水體研究的熱門領(lǐng)域,景觀水體富營養(yǎng)化主要受水體中營養(yǎng)鹽濃度的影響很大,同時各種環(huán)境因素如光照、水溫等都對水體富營養(yǎng)化有著重要的影響。特別是目前很多城市人工景觀水體水源采用再生水,使得這部分景觀水體更容易發(fā)生水體富營養(yǎng)化,開展在不同控制條件下再生水補(bǔ)給景觀水體水質(zhì)變化規(guī)律的研究已成為當(dāng)前景觀水體研究的熱點(diǎn)問題。通過構(gòu)建人工水族箱試驗裝置,對以再生水做為水源的景觀水體為研究對象,選取影響景觀水體富營養(yǎng)化的水體鹽度、垂直方向擾動以及底泥沉積物等幾個重要外界因素,考察了不同水體鹽度,垂向擾動對水體感官指標(biāo)、營養(yǎng)鹽濃度、藻類生長及藻類種群變化的影響,并通過燒杯試驗?zāi)M了不同底泥不同上覆水對底泥中污染物的釋放與富集以及上覆水的水質(zhì)變化的影響。研究結(jié)果表明:(1)景觀水體在最適鹽度(3g/L)條件下,水體中的藻類繁殖速度最快,水體富營養(yǎng)化程度較高;過高的鹽度可以顯著抑制藻類的生長繁殖,且鹽度的改變會引起水中藻類優(yōu)勢種群的變化。鹽度通過影響水體中藻類的生長繁殖,進(jìn)而影響景觀水體的水質(zhì)。(2)低流速擾動條件下(0~4.6m/h),垂向擾動流速越大藻類生長越容易受到抑制。在高擾動強(qiáng)度下(7.5~30m/h),22.5m/h試驗組對水體中藻類生長的影響抑制最為顯著,大于或小于該擾動強(qiáng)度時均會促進(jìn)藻類的生長繁殖。相比于垂直擾動試驗組,推流試驗組葉綠素a濃度增長較快,表明垂直方向擾動更能有效抑制藻類生長。且流速的變化能夠?qū)е滤w中藻類優(yōu)勢種群的變化。(3)上覆水與沉積物之間營養(yǎng)元素之間的污染物質(zhì)交換是一個動態(tài)平衡的關(guān)系,底泥存在吸附-釋放臨界濃度,上覆水中營養(yǎng)元素濃度高則表現(xiàn)為在底泥中累積。擾動是影響營養(yǎng)物釋放的重要因素,擾動使吸附-釋放臨界濃度提高且加速了底泥中的營養(yǎng)物的釋放。灃河沉積物中氮的吸附-釋放臨界濃度為0.7~1.09mg/L,有擾(4)動時上升為0.8~1.32mg/L,磷的吸附-釋放臨界濃度在0.07~0.08mg/L之間,有擾動時上升為0.08~0.12mg/L。思源湖沉積物中氮的吸附-釋放臨界濃度為.57~3.24mg/L,有擾動時為2.23~4.34mg/L。磷的吸附-釋放臨界濃度在0.36~0.53mg/L之間,有擾動時上升為0.40~0.82mg/L。
[Abstract]:Eutrophication control of landscape water is always a hot field in landscape water research. Eutrophication of landscape water is mainly affected by nutrient concentration in water body and various environmental factors such as illumination. Water temperature has an important effect on water eutrophication. In particular, at present, many urban artificial landscape water sources use recycled water, which makes this part of the landscape water more prone to eutrophication. It has become a hot issue to study the changing law of water quality of reclaimed water in landscape water body under different control conditions. By constructing an artificial aquarium test device, several important external factors, such as salinity, vertical disturbance and sediment, which affect eutrophication of landscape water body, are selected for landscape water body with reclaimed water as its water source. The effects of salinity and vertical disturbance on sensory index, nutrient concentration, algae growth and algae population were investigated. The effects of different overlying water on the release and enrichment of pollutants and the change of water quality of overlying water were simulated by beaker test. The results showed that under the optimum salinity of 3 g / L, the algae propagation rate in the landscape water was the fastest and the eutrophication degree of the water was higher, and too high salinity could significantly inhibit the growth and reproduction of algae. And the change of salinity will lead to the change of dominant population of algae in water. Salinity affects the growth and reproduction of algae in water, and then affects the water quality of landscape water. (2) under the condition of low velocity disturbance, algae growth is easily inhibited with the increase of vertical disturbance velocity. Under the high disturbance intensity, the effect of 7.5m / h 30 m / h and 22.5m / h on algae growth in water was the most significant. When the disturbance intensity was greater than or less than the disturbance intensity, the algae growth and reproduction would be promoted. Compared with the vertical disturbance test group, the chlorophyll a concentration increased faster in the push flow test group, which indicated that the vertical disturbance could inhibit algae growth more effectively. And the change of velocity can lead to the change of dominant algal population in water body. The pollution material exchange between overlying water and sediment is a dynamic equilibrium relationship, and there is a critical concentration of adsorption-release in sediment. The high concentration of nutrient elements in the overlying water is the accumulation of nutrients in the sediment. Disturbance is an important factor affecting nutrient release. Disturbance increases the critical concentration of adsorption-release and accelerates the release of nutrients from sediment. The critical concentration of nitrogen adsorption-release in sediment is 0.7 ~ 1.09 mg / L, with disturbance 4). The critical concentration of adsorption-release of phosphorus is between 0.07~0.08mg/L and 0.08 ~ 0.12 mg 路L ~ (-1) 路L ~ (-1) ~ (-1) ~ (-1) mg 路L ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) 路L ~ (-1) ~ (-1) ~ (-1) ~ (-1). The critical concentration of nitrogen adsorption-release in Siyuan Lake sediments is. 57 ~ 3.24 mg / L, and 2.23 ~ 4.34 mg / L when disturbed. The critical concentration of phosphorus adsorption-release is between 0.36~0.53mg/L and increases to 0.400.82 mg / L when disturbed.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X52

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