發(fā)布時間：2018-05-17 07:24

  本文選題：煤粉 + 焦粉　； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：雙膜工藝廣泛應(yīng)用于焦化廢水深度處理過程,從廢水中獲得70%高品質(zhì)出水的同時會形成30%的反滲透濃水(ROC)。ROC中有機(jī)物比系統(tǒng)進(jìn)水高2-3倍,且通常為難生物降解的溶解性有機(jī)物。若未經(jīng)妥善處理直接排放,將會對環(huán)境造成極大的危害。相比于吸附法,生物法和高級氧化法受水質(zhì)影響比較大,處理效果不甚理想�；钚蕴康葌鹘y(tǒng)吸附劑存在價格昂貴、再生困難及污染物沒有合理去向等缺點,導(dǎo)致吸附法未得到大面積推廣運(yùn)用。由此,本文試圖尋找一種新型吸附劑去除反滲透濃水中有機(jī)污染物,確保使用成本降低以及吸附效率提高,促使吸附法在實踐中得到更加廣泛的應(yīng)用。在文獻(xiàn)回顧及理論分析基礎(chǔ)上,選擇煤粉、細(xì)焦粉和粗焦粉作為三類備選吸附劑。首先,采用三級靜態(tài)吸附試驗對三種吸附劑去除ROC中有機(jī)污染物的效果進(jìn)行對比,確定較優(yōu)吸附劑。其次,對選定的吸附劑進(jìn)行吸附效果、吸附模型以及吸附性能的分析,為該吸附劑的工業(yè)應(yīng)用提供理論指導(dǎo)。主要研究內(nèi)容如下:對ROC進(jìn)行水質(zhì)分析。該污水呈淺黃色,離子含量較高,氯離子濃度為3347.81 mg/L,同時COD和UV254分別為219.00 mg/L和4.36。對吸附劑進(jìn)行理化性質(zhì)分析。采用激光粒度激光粒度儀、掃描電鏡、傅里葉變換紅外光譜、比表面測定儀分別對三種吸附劑的粒度組成、表面微觀形貌、表面含氧官能團(tuán)、比表面積、孔容和孔徑分布進(jìn)行分析。結(jié)果表明:-0.074 mm的顆粒分別在煤粉、細(xì)焦粉、粗焦粉中的比例占82.69%、69.68%、62.85%。細(xì)焦粉的孔隙結(jié)構(gòu)比煤粉表面發(fā)達(dá),表面粗糙度也是比煤粉和粗焦粉要大。煤粉、細(xì)焦粉及粗焦粉BET比表面積5.03 m2/g、24.82 m2/g及20.51 m2/g。吸附劑的選型與吸附性能研究。通過三級靜態(tài)吸附試驗得出,細(xì)焦粉、粗焦粉及煤粉對ROC中COD去除率可分別達(dá)到76.26%、74.06%及65.75%。建立靜態(tài)吸附試驗系統(tǒng),得到細(xì)焦粉投加量、吸附時間、溶液pH值等因素對反滲透濃水中COD及UV254的去除效果和影響規(guī)律。研究表明,當(dāng)試驗條件為細(xì)焦粉投加量120 g/L、吸附時間10 min、溶液pH為7.56,對ROC中COD和UV254的去除率可達(dá)77.72%和86.22%,吸附后廢水COD值為48.80 mg/L。探究溶液pH值對細(xì)焦粉孔隙結(jié)構(gòu)及表面官能團(tuán)的影響。與原細(xì)焦粉對比發(fā)現(xiàn),經(jīng)酸和堿處理后,細(xì)焦粉吸收峰、官能團(tuán)的種類及孔隙結(jié)構(gòu)均未發(fā)生明顯變化。引入響應(yīng)面試驗得到函數(shù)方程,并對預(yù)測模型進(jìn)行驗證,結(jié)果表明該模型能夠較好反映COD、UV254去除率。吸附劑的吸附特性研究。對比吸附前后細(xì)焦粉的表面官能團(tuán)以及表面微觀形貌的變化,考察細(xì)焦粉吸附反滲透濃水中有機(jī)污染物的動力學(xué)以及熱力學(xué)特征。通過數(shù)據(jù)擬合發(fā)現(xiàn),細(xì)焦粉對反滲透濃水中有機(jī)污染物的吸附動力學(xué)曲線符合準(zhǔn)二級動力學(xué)方程;等溫吸附線符合Freundlinch等溫吸附方程。
[Abstract]:Dual-membrane process is widely used in the advanced treatment of coking wastewater. When 70% high quality effluent is obtained from the wastewater, 30% of the organic matter in ROC.ROC will be 2-3 times higher than the influent of the system, and it is difficult to biodegrade dissolved organic matter. If the discharge is not handled properly, it will do great harm to the environment. Compared with adsorption method, biological method and advanced oxidation method are greatly affected by water quality, and the treatment effect is not satisfactory. The traditional adsorbents such as activated carbon have some disadvantages such as high price, difficulty in regeneration and lack of proper direction of pollutants, which lead to the lack of extensive application of the adsorption method. Therefore, this paper tries to find a new adsorbent to remove organic pollutants in reverse osmosis (RO) concentrated water, so as to reduce the use cost and improve the adsorption efficiency, which will promote the application of adsorption method in practice. On the basis of literature review and theoretical analysis, coal powder, fine coke powder and coarse coke powder were selected as three kinds of alternative adsorbents. First, three kinds of static adsorption experiments were used to compare the effects of three adsorbents on the removal of organic pollutants from ROC, and the better adsorbents were determined. Secondly, the adsorption effect, adsorption model and adsorption performance of the selected adsorbent are analyzed, which provides theoretical guidance for the industrial application of the adsorbent. The main research contents are as follows: the water quality of ROC is analyzed. The wastewater is yellowish and has a high ion content. The concentration of chloride ion is 3347.81 mg / L, and the COD and UV254 are 219.00 mg/L and 4.36 mg/L, respectively. The physical and chemical properties of the adsorbent were analyzed. Laser particle size analyzer, scanning electron microscope, Fourier transform infrared spectroscopy (FTIR) were used to analyze the particle size composition, surface morphology, surface oxygen functional group and specific surface area of the three adsorbents, respectively. Pore volume and pore size distribution were analyzed. The results show that the proportion of% -0.074 mm particles in coal powder, fine coke powder and coarse coke powder is 82.699.68mm and 62.85mm, respectively. The pore structure of fine coke powder is more developed than that of coal powder surface, and the surface roughness is larger than that of coal powder and coarse coke powder. The specific surface area of coal powder, fine coke powder and coarse coke powder is 5.03 m2 / g, 24.82 m2 / g and 20.51 m2 / g respectively. Study on the selection of adsorbent and its adsorption performance. Through the three-stage static adsorption test, it is found that the removal rate of COD in ROC by fine coke powder, coarse coke powder and coal powder can reach 76.2674.06% and 65.75% respectively. The static adsorption test system was established to obtain the removal efficiency and influence law of COD and UV254 in concentrated reverse osmosis water by the addition of fine coke powder, adsorption time and pH value of solution. The results showed that the removal rates of COD and UV254 in ROC were 77.72% and 86.22%, respectively, when the dosage of fine coke powder was 120 g / L, adsorption time was 10 min, pH was 7.56, and the COD value of wastewater was 48.80 mg / L after adsorption. The effect of pH value of solution on pore structure and surface functional groups of fine coke powder was investigated. Comparing with the original fine coke powder, it was found that the absorption peak, functional group type and pore structure of the fine coke powder did not change obviously after acid and alkali treatment. The function equation is obtained by using response surface test and the prediction model is verified. The results show that the model can well reflect the removal rate of CODU UV254. Study on adsorption characteristics of adsorbent. The changes of surface functional groups and surface morphology of fine coke powder before and after adsorption were compared, and the kinetics and thermodynamics of adsorption of organic pollutants in concentrated water by reverse osmosis were investigated. It is found that the adsorption kinetics curve of fine coke powder for concentrated organic pollutants in reverse osmosis water accords with quasi-second-order kinetic equation and the isothermal adsorption line accords with Freundlinch isothermal adsorption equation.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X784

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本文編號：1900490