本文關(guān)鍵詞： 硫酸鹽還原菌 數(shù)值模擬 Fluent Visual Modflow 溶質(zhì)運(yùn)移 靈敏度分析　出處：《安徽工程大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：酸性礦井水污染問(wèn)題受到廣泛關(guān)注,其危害在于低pH值、含有重金屬離子和高濃度硫酸鹽等其他污染物質(zhì)。若不加以處理,直接排放到環(huán)境中,一方面會(huì)污染地表水,使得地表水中的浮游生物、藻類、魚(yú)類等生物大量死亡,破壞區(qū)域內(nèi)穩(wěn)定的生態(tài)系統(tǒng),另一方面若滲透到地下含水層等,污染物的擴(kuò)散范圍廣、影響時(shí)間長(zhǎng)。對(duì)該類污染學(xué)者提出利用可滲透反應(yīng)墻固定化硫酸鹽還原菌原位進(jìn)行處理。前期試驗(yàn)研究表明,研究所提出的可滲透反應(yīng)墻固定化硫酸鹽還原菌原位對(duì)處理酸性礦井水效果良好。但是仍需要對(duì)反應(yīng)墻中的降解機(jī)理進(jìn)行更進(jìn)一步的研究,因此本研究考慮對(duì)可滲透反應(yīng)墻建立數(shù)值模型,包括水流運(yùn)動(dòng)模型和溶質(zhì)運(yùn)移模型,模擬研究可滲透反應(yīng)墻降解高濃度硫酸鹽。本研究主要實(shí)驗(yàn)及模擬結(jié)果如下：(1)本研究選取了一種填充可滲透反應(yīng)墻介質(zhì),該填充介質(zhì)均勻混合了四種物質(zhì),分別為直徑5mm陶粒和玉米芯(按1：1配比),適量污泥和硫酸鹽還原菌。對(duì)構(gòu)建的柱體系統(tǒng)進(jìn)行試驗(yàn),得到有效孔隙度為0.305,滲透系數(shù)為1.12mm/s,縱向彌散度αL=0.01m,吸附分配系數(shù)Kd=8.89×10-4L/g。(2)實(shí)驗(yàn)室搭建可滲透反應(yīng)墻水槽系統(tǒng)來(lái)處理模擬酸性礦井水,填充介質(zhì)選用上述材料。采用蠕動(dòng)泵進(jìn)水和溢流出水,模擬水力停留時(shí)間為24h,硫酸鹽入料濃度在3000mg/L左右。流體進(jìn)入填充介質(zhì)后pH迅速升高至中性,適宜硫酸鹽還原菌生長(zhǎng)。槽體內(nèi)玉米芯軟化為硫酸鹽還原菌提供碳源,溶液電導(dǎo)率值持續(xù)穩(wěn)定在5500～6000us/cm。根據(jù)4、5、6和7號(hào)取樣點(diǎn)硫酸鹽濃度值,線性擬合得到硫酸鹽還原菌的一階反應(yīng)速率λ1=0.03(1/d),λ2=0.003(1/d)。(3)采用Fluent軟件對(duì)自組裝可滲透反應(yīng)墻槽體進(jìn)行水力學(xué)模擬研究發(fā)現(xiàn)：流體在進(jìn)入多孔介質(zhì)材料時(shí)存在渦流現(xiàn)象,多孔介質(zhì)的宏觀平均流速與實(shí)際流速相差不大。槽體內(nèi)多孔介質(zhì)材料的邊界流量因受粘滯阻力作用比中心流量小,溢流出口下端存在死水區(qū)。陶粒介質(zhì)間流速較大,能達(dá)到進(jìn)水流速的3-4倍。(4)通過(guò)Visual Modflow軟件核心方程,修正得到新型可滲透反應(yīng)墻固定化硫酸鹽還原菌水流運(yùn)動(dòng)方程和溶質(zhì)運(yùn)移方程。對(duì)比沒(méi)有可滲透反應(yīng)墻系統(tǒng)與有該系統(tǒng)得到,前者會(huì)導(dǎo)致污染區(qū)域?qū)?huì)擴(kuò)散至很大范圍,達(dá)到穩(wěn)定狀態(tài)(污染范圍及濃度不增不減)需要的時(shí)間比較長(zhǎng),后者則隨著污染物質(zhì)的排放,填充介質(zhì)將有效并迅速吸附降解污染物,改善下游環(huán)境,達(dá)到原位治理的效果。軟件模擬顯示其濃度衰減變化趨勢(shì)較快,不向周圍地質(zhì)環(huán)境擴(kuò)散。(5)基于對(duì)水流運(yùn)動(dòng)方程和溶質(zhì)運(yùn)移方程的敏感性因子分析,引入靈敏度分析方法。本文以滲透系數(shù)K、吸附分配系數(shù)Kd,固定相一階反應(yīng)速率λ2和流動(dòng)相一階反應(yīng)速率λ1這4個(gè)參數(shù)為研究對(duì)象,分析這4個(gè)參數(shù)的靈敏度,得到λ1對(duì)可滲透反應(yīng)墻處理酸性礦井水模型的影響最小,而λ2、K和Kd的影響相對(duì)較大,λ2與其他3個(gè)參數(shù)相關(guān)性不大。這4個(gè)參數(shù)在其他基本參數(shù)不變的情況下,增幅10%時(shí)分別為63.77mg/L、94.66mg/L和97.09mg/L,增幅20%分別為61.11mg/L、88.23mg/L和90.77mg/L。參數(shù)在增幅10%和20%時(shí),總靈敏度變幅為63.45mg/L和60.54mg/L。
[Abstract]:Acid mine water pollution problem has attracted widespread attention, its harm is low pH, high concentration of sulfate containing heavy metal ions and other pollutants. If not treated and discharged directly to the environment, on the one hand will surface water pollution, makes the surface water plankton, algae, fish and other creatures of death, destruction of the ecological system stability in the region, on the other hand, if the seepage into underground aquifers, diffusion of pollutants, the effect time is long. The permeable reactive barrier in situ immobilization of sulfate reducing bacteria in the treatment for the pollution of scholars. Preliminary experimental study shows that the proposed permeable reactive barrier immobilized sulfate reduction bacteria in situ of acid mine water treatment effect is good. But still need to make further research on the degradation mechanism of reaction wall, so the study on permeable wall should be considered anti establishment The numerical model includes water flow model and solute transport model, simulation study on permeable reactive barrier degradation of high concentration sulfate. This research is experimental and simulation results are as follows: (1) this study selected a filled permeable reactive barrier medium, the medium mixed four kinds of materials were 5mm in diameter and ceramsite corncob (1:1 ratio), the amount of sludge and sulfate reducing bacteria. To test the column system, effective porosity is 0.305, the coefficient of permeability is 1.12mm/s, longitudinal dispersion of alpha L=0.01m, adsorption distribution coefficient Kd= 8.89 * 10-4L/g. (2) constructed the permeable reactive barrier tank system to deal with simulated acid mine water the material selection, filling medium. Using a peristaltic pump inlet and overflow outlet, simulate the hydraulic retention time was 24h, the sulfate feeding concentration at about 3000mg/L. The fluid into the filling medium after pH. The speed is increased to neutral, suitable for sulfate reducing bacteria growth. The trough of corncob softening provided the source of carbon for sulfate reducing bacteria, solution conductivity remained steady at 5500 ~ 6000us/cm. according to 4,5,6 and No. 7 sampling points of sulfate concentration by first-order reaction rate lambda 1=0.03 SRB linear fitting (1/d), 2=0.003 1/d (lambda). (3) the use of Fluent software for hydraulic simulation study found that the permeable reactive barrier tank self-assembly: eddy current phenomenon in fluid into the porous medium material, the macro average velocity of flow in porous medium and the actual flow rate had little difference. The boundary flow of porous material trough due to viscous resistance than the center flow is small, there are water overflow outlet end. Medium ceramsite high velocity, inlet velocity can reach 3-4 times. (4) by Visual Modflow software core equation, the corrected model can reverse osmosis The wall should be immobilized sulfate reducing bacteria flow equation and solute transport equation. Compared to the non permeable reactive barrier system and the system, the former lead pollution area will spread to a large extent, to reach a steady state (the scope of pollution and the concentration decrease) it takes a long time, the latter with pollution discharge, filling medium will be effective and rapid adsorption and degradation of pollutants, improve the downstream environment, achieve in-situ treatment effect. Software simulation shows the concentration attenuation trend is fast, does not spread to the surrounding geological environment. (5) the sensitivity analysis of factors on the flow equation and solute transport equation based on using sensitivity analysis method. Based on the penetration K coefficient, partition coefficient Kd, the first-order reaction rate of stationary phase and mobile phase lambda 2 lambda 1 first-order reaction rate of these 4 parameters as the research object, analysis of the 4 parameters of the spirit Get a sensitivity, the permeable reactive barrier effect of acid mine water model of minimum 1, and lambda 2, effect of K and Kd is relatively large, lambda 2 and the other 3 parameters are not relevant. The 4 parameters in the same basic parameters, an increase of 10% respectively 63.77mg/L, 94.66mg/L and 97.09mg/L, an increase of 20% respectively 61.11mg/L, 88.23mg/L and 90.77mg/L. parameters in the growth of 10% and 20%, the total sensitivity range of 63.45mg/L and 60.54mg/L.

【學(xué)位授予單位】：安徽工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X751;X172

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本文編號(hào)：1548052