钢渣抑制底泥磷释放及在人工湿地中的应用研究
发布时间:2018-06-12 22:55
本文选题:钢渣 + 底泥磷释放 ; 参考:《河北大学》2017年硕士论文
【摘要】:近年来,随着我国工业的不断发展进步,污水排放量的逐渐增加,河湖富营养化现象日益严重,已成为十分严重的环境问题。造成水体富营养化的主要原因为氮、磷等营养盐过度的排入,其中大部分河湖为磷制约型水体。因此,如何降低水体中的磷浓度成为急需解决的问题。河北省作为钢铁大省,每年的钢渣产量都在全国前列,但钢渣作为一种固体废物,并没有得到有效的利用。因此,本研究通过将钢渣作为河湖底泥的固磷剂和将钢渣应用于人工湿地基质两种方式,得出钢渣应用于控制河湖富营养化的有效途径。具体研究内容和结果如下:(1)研究了钢渣的吸附性能。通过钢渣的吸附动力学实验和钢渣吸附等温线的绘制,对供试三种钢渣的吸附性能进行了分析比较。试验结果显示钢渣对磷的吸附符合Langmuir吸附等温模型,同时符合伪二级动力学方程。说明钢渣对磷的吸附属于化学吸附和SX分子层吸附。供试的三种钢渣中钢渣二号对磷的吸附性能最好。(2)研究了底泥磷释放的规律。通过对四种底泥磷释放的模拟实验,绘制了每种底泥的释放规律曲线,实验表明不同底泥磷释放的规律并不相同,但释放速率都为先增大后减小,且在10-20天之间达到峰值,供试的四种底泥中清水河底泥的磷释放量最大,达到的峰值最高,上覆水总磷浓度最高可达到0.74mg/L。(3)研究了钢渣的加入对底泥磷释放的影响。通过将钢渣加入底泥磷释放模拟装置中,测试上覆水总磷浓度的变化,发现钢渣对底泥磷释放有显著的抑制作用。其中钢渣的粒径越小钢渣对底泥磷释放的抑制效果越好。钢渣的投加量越多对底泥磷释放的抑制效果越好。但将钢渣应用于底泥的固磷剂时,应选择处理效果好的投加量以达到最大的经济效益。(4)将钢渣作为基质,设计了潜流人工湿地中试实验,实验设计中层添加45cm沸石、45cm转炉钢渣、40cm转炉钢渣加10cm砂石、40cm转炉钢渣加10cm沸石四组平行实验,实验结果表明,加入钢渣和钢渣与沸石的组合都可以有效的降低入水总磷的浓度,保证人工湿地对总磷的去除率达到97%以上。
[Abstract]:In recent years, with the continuous development and progress of China's industry and the gradual increase of sewage discharge, the eutrophication of rivers and lakes is becoming more and more serious, which has become a serious environmental problem. The main reason for the eutrophication of water body is the excessive absorption of nutrients such as nitrogen and phosphorus, of which the large part of the lake is a phosphorus restricted water body. Therefore, how to reduce water Phosphorus concentration in the body has become an urgent problem to be solved. As a major province of iron and steel, the annual output of steel slag in Hebei is in the forefront of the country, but steel slag as a solid waste is not effectively used. Therefore, this study has obtained two ways of applying steel slag as a solid phosphorus agent in the sediment of river and lake and the application of steel slag to the matrix of constructed wetland. The concrete content and results are as follows: (1) the adsorption properties of steel slag are studied. The adsorption properties of three kinds of steel slag are compared by the adsorption kinetics experiment of steel slag and the drawing of the adsorption isotherm of steel slag. The results show that the adsorption of steel slag to phosphorus conforms to Lan The gmuir adsorption isotherm model conforms to the pseudo two stage kinetic equation. It shows that the adsorption of steel slag to phosphorus belongs to chemical adsorption and SX molecular layer adsorption. The adsorption performance of steel slag two in the three steel slag of the tested steel slag is the best. (2) the regularity of phosphorus release in the sediment is studied. By simulating the release of phosphorus in four kinds of sediment, each sediment is plotted. The release regularity of the release law shows that the release rate of phosphorus in different sediment is different, but the release rate is increased first and then decreases, and the peak is reached between 10-20 days. The peak of phosphorus release is the highest in the four kinds of sediment. The highest concentration of the total phosphorus in the overlying water can reach 0.74mg/L. (3) and the addition of steel slag. The effect of steel slag added to the phosphorus release of bottom mud was used to test the change of the concentration of total phosphorus in the overlying water. It was found that the steel slag had a significant inhibition effect on the release of phosphorus in the sediment. The smaller the particle size of the steel slag, the better the inhibition effect on the release of phosphorus from the sediment. The more the amount of steel slag was added to the release of phosphorus from the sediment. The effect is better. But when steel slag is applied to the phosphorus fixing agent in the bottom mud, the best treatment effect should be chosen to achieve the greatest economic benefit. (4) the test experiment of the subsurface flow constructed wetland is designed by using steel slag as matrix, the middle layer of 45cm zeolite, 45cm converter steel slag, 40cm converter steel slag and 10cm sand, 40cm converter steel slag plus 10cm zeolite are designed. Four groups of parallel experiments show that the combination of steel slag and slag and zeolite can effectively reduce the concentration of total phosphorus in water, and ensure that the removal rate of total phosphorus in artificial wetland can reach more than 97%.
【学位授予单位】:河北大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:X757;X52
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