【摘要】：As、Sb污染已成為世界性環(huán)境污染問題,它們的地球化學性質(zhì)類似。本文主要依據(jù)礦區(qū)兩種常見厭氧細菌(SRB和JF-5)在灰?guī)r表面形成FeS膜層,增大吸附劑表面積和吸附性能,通過運用柱實驗、批試驗來研究As和Sb在FeS包覆灰?guī)r中的遷移和競爭行為,探討其吸附機理、包覆膜層的內(nèi)部變化和包覆灰?guī)r的溶解特征。此外,在柱實驗內(nèi)容中初步運用了CXTFIT插入excel解析CDE模型來擬合As、Sb的遷移行為。主要研究結(jié)論如下:1、生物FeS包覆灰?guī)r吸附As、Sb的量與生物FeS包覆量不呈正比增長,吸附量的增加會隨著包覆量的增長衰減。運用CXTFIT插入excel的CDE模型能夠?qū)s、Sb在包覆灰?guī)r中的遷移行為很好的擬合,并得到設(shè)定參數(shù)Rλ=(1.00E+06,0.00E+00)。2、生物FeS對As、Sb的吸附速率、吸附量及占用吸附位的關(guān)系分別為:V_(As)V_(Sb)、Q_(As)Q_(Sb)、W_(As)W_(Sb)。相對于較短的吸附時間(24h),較長時間(48h)吸附的純灰?guī)r和FeS包覆灰?guī)r對As的吸附量分別提高約1倍和3倍。3、As~(5+)和Sb~5在FeS包覆灰?guī)r吸附過程中發(fā)生了還原作用,并且生物納米FeS對As和Sb的吸附行為中存在化學吸附行為。4、FeS包覆灰?guī)r溶解過程中,純灰?guī)r、包覆2d和包覆7d的pH分別為6.4、5.0、4.7。說明生物FeS包覆層能明顯阻滯灰?guī)r的溶解,并能使最終pH降低約1.5個單位。5、不同包覆層厚度對灰?guī)r溶解的初始阻滯能力不同,包覆溶解1h的C1(包覆3天)和C2(包覆7天)pH分別為3和5,說明包覆層發(fā)育越厚對灰?guī)r溶解的阻滯能力越強。6、根據(jù)Frick第一定律,生物FeS包覆灰?guī)r的溶解模型可用公式n_(Ca,sol)=A t~(1/2)-n_(Ca,gyp)進行描述,并得出次生Ca礦物沉淀的量n_(Ca,gyp)值分別為nC_0=19.5、nC_1=11.3、nC_2=16.8。
[Abstract]:As,Sb pollution has become a worldwide environmental pollution problem, their geochemical properties are similar. In this paper, based on the formation of FeS film layer on limestone surface by two common anaerobic bacteria (SRB and JF-5) in mining area, the surface area and adsorption property of adsorbent are increased. The migration and competition behavior of As and Sb in FeS coated limestone are studied by using column experiment and batch test. The adsorption mechanism, the internal changes of the coating layer and the dissolution characteristics of the coated limestone are discussed. In addition, CXTFIT insertion excel analytic CDE model is used to fit the migration behavior of As,Sb in the column experiment. The main conclusions are as follows: (1) the amount of As,Sb adsorbed by biological FeS coated limestone does not increase in direct proportion to the amount of biofilm coated with FeS, but the amount of adsorption decreases with the increase of the amount of encapsulation. The migration behavior of As,Sb in the covered limestone can be fitted well by using the CDE model inserted with excel by CXTFIT, and the fixed parameter R 位 = (1.00E 066 0. 00E 00). 2. The adsorption rate, adsorption capacity and adsorption site of As,Sb by biological FeS are: v _ V _ V _ (Sb) Q _ (As) Q _ (Sb) W _ (As) W _ (Sb)., respectively, and the relation between the adsorption rate, adsorption capacity and adsorption site is: v _ V _ (As) _ V _ (Sb) Q _ (As) _ Q _ (Sb) W _ (As) W _ (Sb). Compared with the shorter adsorption time (24 h), the adsorption of As on pure limestone and FeS coated limestone at a longer time (48 h) increased by about 1 and 3 times, respectively, and the reduction of Sb~5 and As5 on the adsorption process of FeS coated limestone took place. In addition, the chemisorption behavior of As and Sb by biological nanometer FeS. 4FeS-coated limestone dissolved in pure limestone, the pH of 2d and 7d were 6.4N 5.00.4.7respectively. The results show that biological FeS cladding can obviously block the dissolution of limestone and reduce the final pH by about 1.5 units. The initial blocking ability of different coating thickness on limestone dissolution is different. The pH values of C1 (3 days) and C2 (7 days) of coating dissolution for 1 h are 3 and 5, respectively, which indicate that the thicker the cladding layer is, the stronger the retardation of limestone dissolution is. According to Frick's first law, The dissolution model of biogenic FeS coated limestone can be described by the formula n _ (Ca,sol) A t ~ (1 / 2) -n _ (Ca,gyp), and the quantity n _ (Ca,gyp) of secondary Ca mineral precipitation is obtained as nC_0=19.5,nC_1=11.3,nC_2=16.8..
【學位授予單位】：西南科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X172;X751

【參考文獻】

相關(guān)期刊論文 前10條

1 劉云芳;任森;吳日良;李陽陽;石向輝;遲偉東;黃啟谷;;雙層SiO_2包覆Fe_3O_4復合材料的制備及其染料吸附性能[J];無機化學學報;2015年12期

2 李海寧;陳靜;李秋梅;鳳翔;王卓;張高生;;鐵錳復合氧化物包覆海砂的吸附除磷研究[J];環(huán)境科學學報;2016年03期

3 李志萍;李欣益;馬燕;李雅靜;;地下水中砷去除機理實驗研究[J];河南理工大學學報(自然科學版);2014年02期

4 劉桂芳;于樹芳;王春麗;任芝軍;李嘉;孫亞全;高遠;;水中As(Ⅲ)氧化的研究進展[J];工業(yè)水處理;2013年09期

5 盧莎莎;顧尚義;韓露;王其;;都柳江水體-沉積物間銻的遷移轉(zhuǎn)化規(guī)律[J];貴州大學學報(自然科學版);2013年03期

6 劉洋;張玉龍;張玉玲;虞娜;王靜;鄒洪濤;;遼寧省設(shè)施土壤重金屬Cd、Ni、As有效態(tài)含量及其影響因素的研究[J];農(nóng)業(yè)環(huán)境科學學報;2012年06期

7 肖文帥;朱鐵群;李兵;王金瑾;;銻的界面環(huán)境化學行為的研究進展[J];廣東化工;2012年04期

8 李雪華;徐鵬;李俊青;曹若愚;范航;高媛媛;;廣西大廠礦區(qū)沉積物重金屬污染及風險評價[J];中北大學學報(自然科學版);2012年02期

9 張道勇;潘響亮;穆桂金;;水、土環(huán)境中的銻(Sb)污染及其對植物和微生物的生態(tài)毒理效應(yīng)研究進展[J];應(yīng)用與環(huán)境生物學報;2010年06期

10 朱靜;郭建陽;王立英;潘響亮;符志友;廖海清;吳豐昌;;銻的環(huán)境地球化學研究進展概述[J];地球與環(huán)境;2010年01期

相關(guān)碩士學位論文 前2條

1 劉娟;錳包覆羥基磷灰?guī)r去除高砷酸礦水及Matlab遷移數(shù)值模擬[D];西南科技大學;2015年

2 龔本根;高砷煤砷釋放特性及礦物轉(zhuǎn)化的研究[D];華中科技大學;2012年

，

本文編號：2229667