本文選題：二氧化氯　切入點(diǎn)：消毒副產(chǎn)物　出處：《南京理工大學(xué)》2012年碩士論文

【摘要】：為了去除飲用水經(jīng)二氧化氯消毒后的副產(chǎn)物——亞氯酸鹽(ClO2-),本文結(jié)合飲用水常規(guī)處理工藝對(duì)活性炭,抗壞血酸和硫酸亞鐵去除水中ClO2-的方法進(jìn)行了研究。研究工作主要包括三個(gè)方面：第一,通過(guò)單因素實(shí)驗(yàn)和正交實(shí)驗(yàn)對(duì)粉末活性炭(PAC)、抗壞血酸(VC)及硫酸亞鐵去除ClO2-的工藝進(jìn)行了實(shí)驗(yàn)研究；第二,通過(guò)考察PAC吸附ClO2-的熱力學(xué)、動(dòng)力學(xué),并對(duì)吸附機(jī)理進(jìn)行了初步的探討；第三,考察了顆�；钚蕴�(GAC)吸附去除ClO2動(dòng)態(tài)實(shí)驗(yàn)的影響因子對(duì)去除效果的影響,獲得了可供工程實(shí)踐參考的工藝數(shù)據(jù)。 單因素實(shí)驗(yàn)結(jié)果表明,pH值、藥劑投加量和反應(yīng)溫度對(duì)各種藥劑去除ClO2均有較大的影響,PAC對(duì)ClO2-的去除率受ClO2-的初始濃度影響較大,而對(duì)VC和硫酸亞鐵對(duì)ClO2-去除率受其影響較��；隨著反應(yīng)時(shí)間的增加,PAC和VC對(duì)ClO2-的去除率先增加后趨于穩(wěn)定,而硫酸亞鐵與ClO2-反應(yīng)迅速,幾秒內(nèi)即可將ClO2-基本去除。通過(guò)正交實(shí)驗(yàn)確定了三種工藝的優(yōu)化條件,其中,PAC去除工藝為：pH=6、活性炭負(fù)荷(ClO2-/PAC)=25mg/g、反應(yīng)時(shí)間15min及反應(yīng)溫度35℃；VC去除工藝為：pH=5、VC//ClO2-質(zhì)量比=5.5、反應(yīng)時(shí)間20min及反應(yīng)溫度30℃;硫酸亞鐵去除工藝為：pH=5、Fe2+/ClO2-質(zhì)量比=4、反應(yīng)溫度為40℃。 PAC吸附ClO2的熱力學(xué)研究結(jié)果顯示,活性炭吸附ClO2-是一個(gè)以物理吸附為主,化學(xué)吸附為輔的過(guò)程,吸附過(guò)程是吸熱的,吸附熱力學(xué)符合Freundlich吸附等溫模型。吸附動(dòng)力學(xué)的研究結(jié)果表明,在PAC吸附ClO2-的過(guò)程中,顆粒內(nèi)擴(kuò)散過(guò)程并不是吸附速率的唯一控制過(guò)程,液膜擴(kuò)散可能對(duì)其也有很大的影響。其吸附動(dòng)力學(xué)符合偽二級(jí)動(dòng)力學(xué)模型。 GAC吸附去除ClO2-的動(dòng)態(tài)實(shí)驗(yàn)結(jié)果表明,在其它條件不變的情況下,活性炭柱碳層高度的增加將延長(zhǎng)其吸附飽和時(shí)間,水流速度和ClO2-初始濃度的增加則縮短其吸附飽和時(shí)間,研究所確定的較佳工藝條件為：pH=5、活性炭層高H=7.5cm、ClO2初始濃度為200mg/L、流速30L/min、反應(yīng)時(shí)間200min。 上述幾種亞氯酸鹽去除工藝,在實(shí)驗(yàn)所確定的優(yōu)化條件下使用,均能取得較好的去除效果。這些工藝條件或參數(shù),可以為水處理工程相關(guān)工藝的選擇及工藝參數(shù)的確定提供參考依據(jù)。
[Abstract]:In order to remove the by-product of chlorine dioxide disinfection in drinking water, chlorous acid (CLO _ 2-O _ 2), the activated carbon was treated with conventional treatment process of drinking water in this paper. The methods of removing ClO2- from water by ascorbic acid and ferrous sulfate were studied. The research work mainly includes three aspects: first, The removal of ClO2- from powdered activated carbon (PAC), ascorbic acid (VC) and ferrous sulfate was studied by single factor experiment and orthogonal experiment. Secondly, the thermodynamics and kinetics of adsorption of ClO2- by PAC were investigated. The adsorption mechanism was preliminarily discussed. Thirdly, the influence factors of granular activated carbon (GAC) adsorption on the removal of ClO2 were investigated, and the process data for engineering practice were obtained. The results of single factor experiment showed that pH value, dosage and reaction temperature had a great influence on the removal rate of CLO _ 2-, but the initial concentration of CLO _ 2- affected the removal rate of CLO _ 2-, but the removal rate of VC and ferrous sulfate was less affected by the removal rate of CLO _ 2-. With the increase of reaction time, the removal of CLO _ 2- by PAC and VC increased first and then stabilized, while ferrous sulfate reacted quickly with CLO _ 2-, which could be basically removed in a few seconds. The optimum conditions of the three processes were determined by orthogonal experiment. The removal process of 15min and VC at 35 鈩，

本文編號(hào)：1654779