本文選題：污染底泥 + 覆蓋�。� 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：污染底泥是河道主要污染源之一,隨著外源污染的有效控制和河道水體治理的推進(jìn),污染底泥引起的內(nèi)源污染問(wèn)題日益突出,亟需對(duì)河道底泥污染物的釋放予以控制。在多種河道底泥污染治理技術(shù)中,由于底泥原位覆蓋技術(shù)對(duì)環(huán)境造成擾動(dòng)小、處理見(jiàn)效快、效果好而得到廣泛關(guān)注和應(yīng)用。然而,現(xiàn)有的單一覆層或混合覆層的覆蓋材料存在不可同步抑制多種污染物釋放的缺點(diǎn),限制了其適用范圍。本研究提出通過(guò)對(duì)沸石進(jìn)行載鐵制備復(fù)合覆蓋材料的思路,以解決傳統(tǒng)單一覆層或混合覆層材料所存在問(wèn)題。本文通過(guò)對(duì)沸石載鐵鐵源、負(fù)載方法、負(fù)載次數(shù)進(jìn)行優(yōu)選,得到優(yōu)選的載鐵膜沸石(Iron Oxide Coated Zeolite,IOCZ)制備條件,并對(duì)制備成品進(jìn)行表征;其后,考察了優(yōu)選所得IOCZ處理污染物性能和常見(jiàn)共存物質(zhì)對(duì)其處理性能的影響,并初步探究了處理污染物機(jī)制;進(jìn)行柱實(shí)驗(yàn)?zāi)MIOCZ覆層控制底泥污染物釋放場(chǎng)景以為其實(shí)際應(yīng)用提供數(shù)據(jù)支持,并考察所處理污染物存在IOCZ中穩(wěn)定性。通過(guò)研究得到,以氯化鐵為鐵源,鐵泥涂布為負(fù)載方法,負(fù)載一次所得載鐵膜沸石載鐵量、載鐵穩(wěn)定性和處理以氨氮磷酸鹽為典型陰陽(yáng)離子污染物效果最佳。載鐵后,沸石密度未發(fā)生變化;比表面積略有增加;表面新增Fe-OH、Fe-O官能團(tuán);沸石所載氧化鐵晶體為Fe OOH和Fe2O3;IOCZ零電位點(diǎn)位于p H8.5左右。與原沸石相比,IOCZ增加對(duì)磷酸鹽、硫化物及六價(jià)鉻的去除效果,對(duì)氨氮及Cu、Zn、Pb的去除效果略有下降�；旌先芤褐�,氨氮對(duì)IOCZ去除磷酸鹽和硫化物無(wú)影響,硫化物對(duì)磷酸鹽的去除有抑制作用。常見(jiàn)共存物質(zhì)中,天然有機(jī)物對(duì)IOCZ處理氨氮的速率略有減緩作用,Cl-、硅酸根對(duì)其無(wú)影響;天然有機(jī)物對(duì)IOCZ處理磷酸鹽略有抑制作用,Cl-未造成影響,硅酸根離子使IOCZ處理磷酸鹽的處理容量和處理速率均有所下降;三者對(duì)處理硫化物均無(wú)明顯影響。IOCZ作用機(jī)制初步探究表明:IOCZ去除氨氮為靜電吸附作用;處理磷酸鹽為絡(luò)合吸附機(jī)制;處理硫化物為氧化還原反應(yīng)和吸附共同作用。柱實(shí)驗(yàn)結(jié)果表明:IOCZ可有效抑制底部污染物的釋放,所處理污染物總量與覆層厚度之間存在相關(guān)比例系數(shù),且已處理污染物可穩(wěn)定存在于IOCZ中。
[Abstract]:Polluted sediment is one of the main pollution sources in river. With the effective control of exogenous pollution and the improvement of river water treatment, the problem of internal pollution caused by polluted sediment is becoming more and more serious, and it is urgent to control the release of pollutants from river sediment. In many kinds of river channel sediment pollution treatment technology, because the sediment in-situ covering technology has little disturbance to the environment, the treatment effect is quick, the effect is good, so it has been widely paid attention to and applied. However, the existing single or mixed coating materials have the disadvantage of not synchronously inhibiting the release of many pollutants, which limits their application scope. In order to solve the problems existing in traditional single or mixed coating materials, the idea of preparing composite covering materials by carrying iron on zeolites was put forward in this study. In this paper, the preparation conditions of Fe carrying membrane zeolite Iron Oxide Coated Zeolite IOCZs were obtained by the optimum selection of Fe carrying iron Tie Yuan, loading method and loading times, and the final product was characterized. The effects of excellent selected IOCZ on the treatment performance of pollutants and common co-existing substances were investigated, and the mechanism of pollutant treatment was preliminarily explored. Column experiments were carried out to simulate the release scene of pollutants from sediment controlled by IOCZ coating, which provided data support for its practical application, and the stability of pollutants in IOCZ was investigated. The results showed that the best results were obtained by using ferric chloride as Tie Yuan and iron slime coating as loading method. The results showed that the amount of iron loaded with ferric membrane zeolite, the stability of iron carrier and the treatment of anion and anion pollutants with ammonia nitrogen phosphate as typical ion were the best. After iron loading, the density of zeolites did not change, the specific surface area increased slightly, Fe-O functional groups were added on the surface, and the zero potential points of Fe OOH and Fe 2O 3 IOCZ were found to be about pH 8.5. Compared with the original zeolite, IOCZ increased the removal efficiency of phosphate, sulfides and hexavalent chromium, and slightly decreased the removal efficiency of ammonia nitrogen and Cu ~ (2 +) Zn ~ (+ +) Pb. Ammonia nitrogen has no effect on the removal of phosphate and sulfides by IOCZ, while sulfides inhibit the removal of phosphate in mixed solution. Among the common co-existing substances, natural organic compounds have a slight decrease in the rate of ammonia-nitrogen treatment by IOCZ, but silicates have no effect on them, and natural organic compounds have no effect on the inhibition of phosphate treatment by IOCZ. The treatment capacity and treatment rate of phosphate treated with IOCZ were decreased by silicate ion, and the mechanism of removal of ammonia nitrogen by IOCZ was electrostatic adsorption, which had no obvious effect on the treatment of sulfides. Phosphate treatment is a complex adsorption mechanism, and sulfide treatment is redox reaction and adsorption. The results of column experiments show that the release of pollutants from the bottom can be effectively inhibited by the solution. There is a correlation coefficient between the total amount of pollutants treated and the thickness of the coating, and the treated pollutants can exist stably in IOCZ.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X52

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 李佳;林建偉;詹艷慧;;鑭改性沸石活性覆蓋控制重污染河道底泥溶解性磷酸鹽和銨釋放研究[J];環(huán)境科學(xué);2013年11期

，

本文編號(hào)：1798786