本文選題：礦井水 + 混凝　； 參考：《西安科技大學》2016年碩士論文

【摘要】：礦井水是采煤伴生廢水,在干旱的礦區(qū)存在著用水不足現(xiàn)象。如何有效地去處理和利用大量的礦井水對礦區(qū)用水補給、減少水資源浪費具有重要意義�；炷�,作為污水處理的傳統(tǒng)預(yù)處理單元具有很好的凈水效果,在水處理中得到廣泛且有效的應(yīng)用。超濾膜的深度處理使得出水的各項指標進一步得到優(yōu)化。兩者聯(lián)用可優(yōu)化對礦井水的處理效果。但混凝條件的不可控性和超濾過程中的膜污染問題還有待進一步研究。本研究以某礦區(qū)礦井水作為研究對象,考察混凝、混凝—超濾對礦井水SS、COD的去除效果和超濾過程中膜通量的變化,分析混凝劑的投加對超濾膜污染的影響,通過對水樣進出水分子量分布、親疏水性和膜污染層結(jié)構(gòu)的表征,探討混凝—超濾處理礦井水的機理。研究結(jié)果如下:(1)在混凝試驗中,四種混凝劑分別與礦井水在不同劑量、不同pH值、不同混凝時間下混凝沉淀,比較得出:PFS的混凝效果較其混凝劑好,對SS和COD的去除率分別為92%、70%。對COD去除效果差,有待深度處理。通過對Zeta電位、絮體形貌和絮體尺寸進行研究和分析進一步得出:加入PFS后,溶液Zeta電位靠近等電點。加入PFC后,形成絮體呈支狀結(jié)構(gòu),且強度較大。Zeta電位對混凝效果起決定作用。(2)混凝—超濾試驗中,分別對跨膜壓差、過濾方式、耦合方式、混凝劑投加量等進行分析得出:向礦井水中投加30mg/L的混凝劑PFC混凝反應(yīng)1小時后,混凝液在0.1MPa下進行死端超濾,SS和COD的去除率達到99.9%和94%�；炷囼灪突炷瑸V試驗最佳混凝劑不同,對比分析可知:混凝過程中Zeta電位起決定性作用,而在混凝—超濾過程中,穩(wěn)定的支狀絮體結(jié)構(gòu)能有效防止膜污染而優(yōu)化出水水質(zhì)。(3)在混凝—超濾處理礦井水的試驗中,通過對膜污染和膜分離機理的研究表明:混凝—超濾可形成濾餅層而減少不可逆阻力。膜表面污染層中,主要為混凝劑與顆粒物質(zhì)。混凝—超濾可有效去除疏水性大分子有機物和無機顆粒,對親水性小分子有機物處理效果不佳。
[Abstract]:Mine water is associated with coal mining wastewater, there is insufficient water in dry mining area. How to deal with and utilize a large amount of mine water effectively is of great significance to supply water and reduce the waste of water resources. Coagulation, as the traditional pretreatment unit of sewage treatment, has good water purification effect, and has been widely and effectively used in water treatment. The advanced treatment of ultrafiltration membrane further optimizes each index of effluent. Combined use of the two can optimize the treatment effect of mine water. However, the uncontrollability of coagulation conditions and membrane fouling in ultrafiltration process need to be further studied. In this study, the removal effect of coagulation, coagulation-ultrafiltration on SSO COD and the change of membrane flux in the process of ultrafiltration were investigated, and the effect of coagulant addition on the fouling of ultrafiltration membrane was analyzed. Based on the characterization of molecular weight distribution, hydrophobicity and membrane fouling layer structure, the mechanism of coagulation-ultrafiltration treatment of mine water was discussed. The results are as follows: (1) in the coagulation experiment, the four coagulants and mine water were coagulated and precipitated in different dosages, different pH values and different coagulation times, respectively. The results showed that the coagulation effect of the coagulant was better than that of the coagulant, and the removal rates of SS and COD were 92% and 70% respectively. The removal effect of COD is poor, and it needs further treatment. Through the study and analysis of Zeta potential, floc morphology and floc size, it is concluded that the solution Zeta potential is close to the isoelectric point after the addition of PFS. After the addition of PFC, the flocs formed into branched structure, and the strength of the flocs was larger. Zeta potential played a decisive role on coagulation effect. In the coagulation-ultrafiltration test, the transmembrane pressure difference, the filtration mode, the coupling mode, respectively, were studied. The analysis of coagulant dosage shows that the removal rate of dead end ultrafiltration SS and COD can reach 99.9% and 94% respectively after the coagulant PFC coagulant is added with 30mg/L in mine water for 1 hour. The best coagulant is different from the coagulation-ultrafiltration test. The comparison and analysis show that the Zeta potential plays a decisive role in the coagulation process, but in the coagulation-ultrafiltration process, The stable branching floc structure can effectively prevent membrane fouling and optimize the effluent quality. 3) in the experiment of coagulation-ultrafiltration treatment of mine water, The study of membrane fouling and membrane separation mechanism shows that coagulation and ultrafiltration can form filter cake layer and reduce irreversible resistance. In the fouling layer of membrane surface, coagulant and granular material are the main components. Coagulation-ultrafiltration can effectively remove hydrophobic macromolecular organic matter and inorganic particles, and the treatment effect of hydrophilic small molecular organic matter is not good.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：X751

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