本文選題：玉米芯 + 麥飯石　； 參考：《遼寧工程技術(shù)大學(xué)》2015年碩士論文

【摘要】：近年來隨著我國煤炭工業(yè)的快速發(fā)展,酸性礦井水污染日趨嚴重,礦區(qū)水資源供需的矛盾和生態(tài)環(huán)境的惡化已嚴重制約了煤炭工業(yè)的可持續(xù)性發(fā)展。因此,實現(xiàn)煤礦酸性廢水(AMD)的清潔排放、循環(huán)利用具有重大意義。當前,以硫酸鹽還原菌(SRB)為核心的新工藝已在有機廢水、酸性廢水和電鍍廢水等研究領(lǐng)域取得了較大進展。應(yīng)用SRB技術(shù)處理AMD業(yè)已成為該領(lǐng)域發(fā)展的新趨勢。本論文基于微生物固定化技術(shù),采用碳源緩釋原理,即在水解微生物作用下分解玉米芯的方法為SRB提供代謝碳源,并在固定化凝膠中加入鐵屑和麥飯石,營造SRB適宜的微環(huán)境。通過正交試驗確定固定化過程中的最優(yōu)基質(zhì)配比,考察交聯(lián)化方法和交聯(lián)時間對顆粒催化活性和操作穩(wěn)定性的影響。通過厭氧批次試驗研究玉米芯內(nèi)聚量和AMD污染負荷率對顆粒代謝的影響,并分析顆粒處理能力以及活化顆粒對Mn~(2+)的響應(yīng)變化。最后,以固定化顆粒為介質(zhì)構(gòu)建原位修復(fù)裝置,討論AMD原位修復(fù)的可行性和有效性。所得主要結(jié)論如下：(1)采用聚乙烯醇—硼酸包埋固定法,顆粒的最優(yōu)基質(zhì)配比為30%SRB污泥、2%鐵屑、3%麥飯石。顆粒膨脹率、活性與交聯(lián)時間分別呈線性負相關(guān)、一介衰減指數(shù)相關(guān),從保持顆粒穩(wěn)定性與活性角度出發(fā)可將交聯(lián)時間設(shè)定為4-8h。(2)緩釋碳源玉米芯水解引起有機物累積的平均速率為932mg/(L-d),最大累積量為478mgCOD/10g顆粒,固定化顆粒在pH值為2-6和Mn~(2+)濃度小于55mg/L的AMD中都具有良好的活性,可用偽二級動力學(xué)模型描述顆粒對Mn~(2+)的吸附過程(R2=0.995)。Mn~(2+)吸附曲線能同時較好的符合Langmuir (R2=0.983)和Frundlich (R2=0.996)模型,最大理論吸附量為0.998mg/g。(3)活化顆粒還原S042-的最大還原速率為94.88mg/(L·d),一級反應(yīng)動力學(xué)模型能較好的描述還原過程(R2=0.962,k/=0.0997h)。高濃度Mn~(2+)能抑制顆粒提升pH值能力,在濃度梯度作用下Mn~(2+)擴散進入顆粒內(nèi),可直接降低SRB活性,減小S042-還原速率,同時也對水解微生物產(chǎn)生沖擊。(4)UAPB與PRB均具有較強的pH提升能力,但是,UAPB出水OD600值增加顯著,出水渾濁,玉米芯在UAPB中的水解受污染負荷變化影響較大,有機物的急劇累積和快速消耗降低了該系統(tǒng)對S042-處理的穩(wěn)定性。PRB具有很慢的抗沖擊能力,有機物累積存在穩(wěn)定期,約1000mg/L,SO42的最大還原速率為1256mg/(L·d)。對TFe的去除率為99.9%以上,在固定化顆粒吸附位飽和之后,依據(jù)生化作用對Mn~(2+)的去除速率為3.74mg/(L·d)。以上研究表明,在固定化過程中將玉米芯內(nèi)聚,采用污泥中混合菌落多樣的代謝能力,較好的實現(xiàn)了碳源緩釋與污染物去除的同步進行,以該固定化顆粒為填料的PRB系統(tǒng)可成為AMD原位處理的有效方法。
[Abstract]:In recent years, with the rapid development of coal industry in China, the water pollution in acid mines is becoming more and more serious. The contradiction between supply and demand of water resources and the deterioration of ecological environment in mining areas have seriously restricted the sustainable development of coal industry. Therefore, it is of great significance to realize clean discharge and recycling of acid coal mine wastewater. At present, the new process with SRB as the core has made great progress in the field of organic wastewater, acid wastewater and electroplating wastewater. Using SRB technology to deal with AMD has become a new trend in this field. Based on the technology of microorganism immobilization, this paper adopts the principle of slow release of carbon source, that is, the method of decomposing corn cob under the action of hydrolytic microorganism provides the metabolic carbon source for SRB, and adds iron chips and mai Fan stone into the immobilized gel to create a suitable microenvironment for SRB. The optimum ratio of substrate during immobilization was determined by orthogonal test. The effects of crosslinking method and crosslinking time on the catalytic activity and operational stability of particles were investigated. The effects of corncob cohesion and AMD pollution loading rate on particle metabolism were studied by anaerobic batch test. Finally, the feasibility and effectiveness of AMD in situ repair were discussed by using immobilized particles as the medium. The main conclusions are as follows: (1) Polyvinyl alcohol-boric acid entrapment was used. The optimum matrix ratio of the particles was 2% iron scraps of 30 SRB sludge and 3% mai fan stone. The particle expansion rate, activity and crosslinking time were linearly negatively correlated, and the first attenuation index was correlated. In order to maintain particle stability and activity, the average rate of organic matter accumulation induced by hydrolysis of sustained-release corn cob was 932 mg / L ~ (-1), and the maximum accumulation was 478 mg / 10 g corn cob, the crosslinking time was set at 4-8 h 路L ~ (-2). The immobilized particles have good activity in AMD with pH value of 2-6 and MnG-1 / L < 55mg / L. The pseudo-second-order kinetic model can be used to describe the adsorption process of Mn-Pu _ 2 by using pseudo-second-order kinetic model. The adsorption curves of the immobilized particles can be in good agreement with Langmuir R20.983) and Frundlich R2O _ (0.996) models at the same time, and the adsorption curves of the immobilized particles are in good agreement with the Langmuir R20.983) model and the Frundlich R2O _ (0.996) model. The maximum theoretical adsorption capacity is 0.998mg / g 路m3) the maximum reduction rate of activated particle S042- is 94.88 mg / L ~ (-1), and the first-order reaction kinetic model can better describe the reduction process (R _ (22) 0.962g / L ~ (-1) ~ (0.0997hg) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1). High concentration of MNO _ 2) can inhibit the ability of increasing pH value of particles. Under the action of concentration gradient, MNO _ 2) diffuses into the particles, which can directly reduce the activity of SRB and decrease the rate of S042-reduction. At the same time, both UAPB and PRB had strong pH lifting ability to hydrolyze microorganism, but the OD600 value of UAPB effluent increased significantly, the effluent was turbid, and the hydrolysis of corn cob in UAPB was greatly affected by the pollution load change. The rapid accumulation and rapid consumption of organic matter reduced the stability of S042- treatment. PRB had a slow impact resistance. The organic matter accumulation existed in a stable period, and the maximum reduction rate of about 1000mg / L ~ (-1) so _ (2) was 1256 mg / L / L ~ (-1) D ~ (-1) ~ (-1) ~ (-1) 路L ~ (-1) 路L ~ (-1) ~ (-1). The removal rate of TFE is more than 99.9%. After adsorption saturation of immobilized particles, the removal rate of Mn-Pb-2 is 3.74 mg / L 路d ~ (2 +) according to biochemical action. The results showed that, in the process of immobilization, the corn cob was cohesive and the mixed colony of sludge was used to metabolize the compost, and the slow release of carbon source and the removal of pollutants could be achieved synchronously. The PRB system with the immobilized particles as filler can be an effective method for AMD in situ treatment.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X752

【相似文獻】

相關(guān)期刊論文 前10條

1 丁建礎(chǔ),姚s，

本文編號：1997956