擾動條件下不同尺度磷形態(tài)數(shù)量分布的研究
發(fā)布時(shí)間：2019-01-20 13:33
【摘要】：擾動引起的沉積物再懸浮對于水體中磷的遷移轉(zhuǎn)化有著重要影響。粒徑作為沉積物及懸浮物重要的物理特性之一,對磷的吸附沉降起著非常重要的作用。但目前對于不同粒徑分布條件下的水體中磷的遷移轉(zhuǎn)化規(guī)律研究甚少,,并且,粒徑變化對水體中磷特別是不同尺度磷有何影響也不得而知。因而研究不同粒徑分布條件下磷在上覆水中的分布規(guī)律、不同尺度形態(tài)磷數(shù)量分布以及不同粒級沉積物中磷形態(tài)數(shù)量分布對于了解各種不同賦存形態(tài)的磷在不同物理?xiàng)l件下的水體及沉積物中的分布規(guī)律有重要意義。本研究不僅在一定程度上豐富了磷在自然水體中的遷移轉(zhuǎn)化規(guī)律,也能為實(shí)際中的水體的改善修復(fù)提供一定的數(shù)據(jù)支持和理論依據(jù)。研究發(fā)現(xiàn),靜止?fàn)顟B(tài)下,上覆水中懸浮物粒徑分布變化不明顯,但間歇擾動下,上覆水中粒徑分布及上覆水中各不同磷形態(tài)含量發(fā)生明顯變化,其中大顆粒粒徑有明顯增加的趨勢。說明間歇擾動促使大粒徑顆粒在上覆水中的平均占比增加。并且,通過粒徑變化與上覆水中磷形態(tài)數(shù)量變化的相關(guān)性分析可知,靜置水體中粒徑變化與磷形態(tài)數(shù)量變化無明顯相關(guān)關(guān)系,而有間歇擾動水體中兩者有較好的相關(guān)性,說明上覆水中粒徑分布對磷形態(tài)數(shù)量分布有很大影響。另外,通過對外源磷實(shí)驗(yàn)組中粒徑分布與磷數(shù)量的數(shù)據(jù)分析,外源磷加入的情況下,小粒徑對外源磷的吸收率增加了95%,而大粒徑對外源磷的吸收率僅增加20%,說明擾動下小粒徑顆粒對磷的吸附占主要地位。在通過上述實(shí)驗(yàn)驗(yàn)證了磷形態(tài)數(shù)量分布和懸浮物粒徑有良好的相關(guān)性的基礎(chǔ)上,將研究細(xì)化到上覆水中不同尺度的磷形態(tài)數(shù)量分布及不同粒級沉積物中磷形態(tài)數(shù)量分布。研究發(fā)現(xiàn),將四種濾膜的孔徑差劃分為3種尺度,其中A2尺度在多數(shù)情況下具有最大的持磷數(shù)量優(yōu)勢,這可能和擾動條件及A2尺度中微粒自身特性有關(guān)。而從DIP占TP貢獻(xiàn)率角度來說,靜置樣中DIP/TP值在A2尺度中為最高,而擾動樣中DIP/TP值在A3尺度中為最高,這可能與不同粒徑微粒對于磷的固定能力不同有關(guān)。通過對于不同粒級沉積物中不同賦存形態(tài)磷的含量分析可知,從Tot-P角度來講,擾動致使底泥對磷的吸收能力強(qiáng)于靜止條件;粒級越小的沉積物中總磷含量越高,吸收能力越強(qiáng)。從不同粒級沉積物中NH4Cl-P角度來說,擾動條件下的E2和E4中粒級越小吸收的NH4Cl-P的含量越高,而僅存在外源磷加入的靜置組E3中NH4Cl-P各粒徑吸收量無明顯規(guī)律。從不同粒級沉積物中Fe/Al-P角度來說,僅為擾動樣的E2中Fe/Al-P吸收能力隨著粒級減小而變?nèi)�。E3中吸收能力隨著粒級減小而變強(qiáng)。E4中條件復(fù)雜,粒級對于Fe/Al-P吸收規(guī)律不明顯。從不同粒級沉積物中Ca-P角度來說,靜置水樣中不同粒級對于Ca-P吸收無明顯差異,而擾動水樣中顯示為粒級2對于Ca-P的吸收量最高。
[Abstract]:The sediment resuspension caused by disturbance has an important effect on the transport and transformation of phosphorus in water. As one of the important physical properties of sediments and suspended solids, particle size plays a very important role in the adsorption and sedimentation of phosphorus. However, there are few studies on the transport and transformation of phosphorus in water under different particle size distribution conditions, and it is not clear how the change of particle size affects phosphorus in water, especially in different scales. Therefore, the distribution of phosphorus in overlying water under different particle size distribution conditions was studied. The quantitative distribution of phosphorus forms in different scales and in sediments of different grain sizes is of great significance in understanding the distribution of phosphorus in water and sediment under different physical conditions. This study not only enriches the law of phosphorus migration and transformation in natural water to a certain extent, but also provides certain data support and theoretical basis for the improvement and restoration of water body in practice. It was found that the particle size distribution of suspended matter in overlying water did not change obviously under static condition, but the particle size distribution and phosphorus content in overlying water changed obviously under intermittent disturbance. Among them, the size of large particles increased obviously. The results show that intermittent disturbance increases the average percentage of large particle size in overlying water. Through the correlation analysis of particle size change and phosphorus form quantity change in overlying water, it can be seen that there is no obvious correlation between particle size change and phosphorus form quantity change in static water body, but there is good correlation between them in intermittent disturbance water body. The results show that the particle size distribution of overlying water has a great influence on the distribution of phosphorus species. In addition, through the analysis of the data of the particle size distribution and the amount of phosphorus in the experimental group of exogenous phosphorus, the absorption rate of exogenous phosphorus increased by 95% for small particle size, and only 20% for large particle size. The results show that the adsorption of phosphorus by small particle size is dominant under disturbance. On the basis of the above experiments, it was verified that there was a good correlation between the distribution of phosphorus species and the particle size of suspended solids, and the study was carried out on the basis of refinement of the quantitative distribution of phosphorus forms to different scales in overlying water and the quantitative distribution of phosphorus forms in sediments of different grain sizes. It is found that the pore size difference of the four kinds of membranes is divided into three scales, and the A2 scale has the largest phosphorus holding advantage in most cases, which may be related to the disturbance conditions and the characteristics of the particles in the A2 scale. From the point of view of the contribution of DIP to TP, the DIP/TP value of stationary sample is the highest in A2 scale, while the DIP/TP value of disturbed sample is the highest in A3 scale, which may be related to the different fixation ability of different particle size to phosphorus. According to the analysis of phosphorus content in different sediment forms, from the point of view of Tot-P, the phosphorus absorption ability of sediment is stronger than that of static condition. The smaller the grain size is, the higher the total phosphorus content is and the stronger the absorption capacity is. From the point of view of NH4Cl-P in different granular sediments, the content of NH4Cl-P in E _ 2 and E _ 4 was higher than that in E _ (2) and E _ (4), but there was no obvious regularity of the absorption of NH4Cl-P in the static group E3 with exogenous phosphorus. From the point of view of Fe/Al-P in different granular sediments, the absorption capacity of Fe/Al-P in E2, which is only disturbed, becomes weaker with the decrease of grain size, and the absorption capacity in E3 becomes stronger with the decrease of grain size. The conditions in E4 are complex. The grain-level absorption of Fe/Al-P was not obvious. From the point of view of Ca-P in different grain-grade sediments, there was no significant difference in Ca-P uptake between static water samples and disturbed water samples, but the highest Ca-P uptake was observed in disturbed water samples.
【學(xué)位授予單位】：蘇州科技學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X52
本文編號：2412082
[Abstract]:The sediment resuspension caused by disturbance has an important effect on the transport and transformation of phosphorus in water. As one of the important physical properties of sediments and suspended solids, particle size plays a very important role in the adsorption and sedimentation of phosphorus. However, there are few studies on the transport and transformation of phosphorus in water under different particle size distribution conditions, and it is not clear how the change of particle size affects phosphorus in water, especially in different scales. Therefore, the distribution of phosphorus in overlying water under different particle size distribution conditions was studied. The quantitative distribution of phosphorus forms in different scales and in sediments of different grain sizes is of great significance in understanding the distribution of phosphorus in water and sediment under different physical conditions. This study not only enriches the law of phosphorus migration and transformation in natural water to a certain extent, but also provides certain data support and theoretical basis for the improvement and restoration of water body in practice. It was found that the particle size distribution of suspended matter in overlying water did not change obviously under static condition, but the particle size distribution and phosphorus content in overlying water changed obviously under intermittent disturbance. Among them, the size of large particles increased obviously. The results show that intermittent disturbance increases the average percentage of large particle size in overlying water. Through the correlation analysis of particle size change and phosphorus form quantity change in overlying water, it can be seen that there is no obvious correlation between particle size change and phosphorus form quantity change in static water body, but there is good correlation between them in intermittent disturbance water body. The results show that the particle size distribution of overlying water has a great influence on the distribution of phosphorus species. In addition, through the analysis of the data of the particle size distribution and the amount of phosphorus in the experimental group of exogenous phosphorus, the absorption rate of exogenous phosphorus increased by 95% for small particle size, and only 20% for large particle size. The results show that the adsorption of phosphorus by small particle size is dominant under disturbance. On the basis of the above experiments, it was verified that there was a good correlation between the distribution of phosphorus species and the particle size of suspended solids, and the study was carried out on the basis of refinement of the quantitative distribution of phosphorus forms to different scales in overlying water and the quantitative distribution of phosphorus forms in sediments of different grain sizes. It is found that the pore size difference of the four kinds of membranes is divided into three scales, and the A2 scale has the largest phosphorus holding advantage in most cases, which may be related to the disturbance conditions and the characteristics of the particles in the A2 scale. From the point of view of the contribution of DIP to TP, the DIP/TP value of stationary sample is the highest in A2 scale, while the DIP/TP value of disturbed sample is the highest in A3 scale, which may be related to the different fixation ability of different particle size to phosphorus. According to the analysis of phosphorus content in different sediment forms, from the point of view of Tot-P, the phosphorus absorption ability of sediment is stronger than that of static condition. The smaller the grain size is, the higher the total phosphorus content is and the stronger the absorption capacity is. From the point of view of NH4Cl-P in different granular sediments, the content of NH4Cl-P in E _ 2 and E _ 4 was higher than that in E _ (2) and E _ (4), but there was no obvious regularity of the absorption of NH4Cl-P in the static group E3 with exogenous phosphorus. From the point of view of Fe/Al-P in different granular sediments, the absorption capacity of Fe/Al-P in E2, which is only disturbed, becomes weaker with the decrease of grain size, and the absorption capacity in E3 becomes stronger with the decrease of grain size. The conditions in E4 are complex. The grain-level absorption of Fe/Al-P was not obvious. From the point of view of Ca-P in different grain-grade sediments, there was no significant difference in Ca-P uptake between static water samples and disturbed water samples, but the highest Ca-P uptake was observed in disturbed water samples.
【學(xué)位授予單位】：蘇州科技學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X52
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