本文選題：鋼渣 + 底泥磷釋放��； 參考：《河北大學(xué)》2017年碩士論文

【摘要】：近年來,隨著我國工業(yè)的不斷發(fā)展進步,污水排放量的逐漸增加,河湖富營養(yǎng)化現(xiàn)象日益嚴重,已成為十分嚴重的環(huán)境問題。造成水體富營養(yǎng)化的主要原因為氮、磷等營養(yǎng)鹽過度的排入,其中大部分河湖為磷制約型水體。因此,如何降低水體中的磷濃度成為急需解決的問題。河北省作為鋼鐵大省,每年的鋼渣產(chǎn)量都在全國前列,但鋼渣作為一種固體廢物,并沒有得到有效的利用。因此,本研究通過將鋼渣作為河湖底泥的固磷劑和將鋼渣應(yīng)用于人工濕地基質(zhì)兩種方式,得出鋼渣應(yīng)用于控制河湖富營養(yǎng)化的有效途徑。具體研究內(nèi)容和結(jié)果如下:(1)研究了鋼渣的吸附性能。通過鋼渣的吸附動力學(xué)實驗和鋼渣吸附等溫線的繪制,對供試三種鋼渣的吸附性能進行了分析比較。試驗結(jié)果顯示鋼渣對磷的吸附符合Langmuir吸附等溫模型,同時符合偽二級動力學(xué)方程。說明鋼渣對磷的吸附屬于化學(xué)吸附和SX分子層吸附。供試的三種鋼渣中鋼渣二號對磷的吸附性能最好。(2)研究了底泥磷釋放的規(guī)律。通過對四種底泥磷釋放的模擬實驗,繪制了每種底泥的釋放規(guī)律曲線,實驗表明不同底泥磷釋放的規(guī)律并不相同,但釋放速率都為先增大后減小,且在10-20天之間達到峰值,供試的四種底泥中清水河底泥的磷釋放量最大,達到的峰值最高,上覆水總磷濃度最高可達到0.74mg/L。(3)研究了鋼渣的加入對底泥磷釋放的影響。通過將鋼渣加入底泥磷釋放模擬裝置中,測試上覆水總磷濃度的變化,發(fā)現(xiàn)鋼渣對底泥磷釋放有顯著的抑制作用。其中鋼渣的粒徑越小鋼渣對底泥磷釋放的抑制效果越好。鋼渣的投加量越多對底泥磷釋放的抑制效果越好。但將鋼渣應(yīng)用于底泥的固磷劑時,應(yīng)選擇處理效果好的投加量以達到最大的經(jīng)濟效益。(4)將鋼渣作為基質(zhì),設(shè)計了潛流人工濕地中試實驗,實驗設(shè)計中層添加45cm沸石、45cm轉(zhuǎn)爐鋼渣、40cm轉(zhuǎn)爐鋼渣加10cm砂石、40cm轉(zhuǎn)爐鋼渣加10cm沸石四組平行實驗,實驗結(jié)果表明,加入鋼渣和鋼渣與沸石的組合都可以有效的降低入水總磷的濃度,保證人工濕地對總磷的去除率達到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%.
【學(xué)位授予單位】：河北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X757;X52

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