臭氧氧化處理染料廢水的過(guò)程強(qiáng)化
發(fā)布時(shí)間：2018-08-28 12:22
【摘要】：染料廢水存在水量大、水質(zhì)復(fù)雜、色度深、以及含有“三致”毒性物質(zhì)等特點(diǎn)。若不妥當(dāng)處理,將造成嚴(yán)重的環(huán)境污染,從而危害人體健康。在染料廢水處理方面,臭氧氧化技術(shù)由于其高效性和無(wú)二次污染特點(diǎn)而被廣泛研究。然而,傳統(tǒng)的臭氧氧化技術(shù)由于其成本較高,傳質(zhì)效率低,臭氧利用率低,從而阻礙了該技術(shù)工業(yè)應(yīng)用發(fā)展。本研究設(shè)計(jì)微泡加壓反應(yīng)器強(qiáng)化臭氧氧化技術(shù),氧化降解酸性紅18(AR 18)模擬染料廢水。采用VOF模型模擬外加壓力場(chǎng)對(duì)微泡反應(yīng)器內(nèi)氣液界面的變化規(guī)律,并考察了該反應(yīng)器對(duì)臭氧傳質(zhì),廢水脫色及礦化(TOC去除率)效率的影響。同時(shí)還將微泡加壓強(qiáng)化O_3/Ca(OH)_2體系,研究了該聯(lián)用技術(shù)對(duì)染料廢水礦化降解的影響及強(qiáng)化機(jī)理。全文的主要研究結(jié)果如下:微泡加壓反應(yīng)器有效提高了其傳質(zhì)效率,液相中臭氧濃度達(dá)到穩(wěn)定狀態(tài)速率較快,其液相中臭氧濃度約為11.7 mg/L,比鼓泡體系高約10%。微泡加壓反應(yīng)器中羥基自由基產(chǎn)生量高于傳統(tǒng)鼓泡體系,臭氧通入5 min,微泡體系中羥基自由濃度高達(dá)121.45μM,比鼓泡體系提高了約11倍。液相中臭氧濃度以及羥基自由基產(chǎn)生量受壓力影響較小,溫度影響較大,水中臭氧濃度隨溫度的增加而減少,羥基自由基產(chǎn)生量隨溫度增加而增加,兩者都隨進(jìn)口臭氧濃度及流量的增加而增加。微泡反應(yīng)體系中廢水脫色及礦化效率都高于鼓泡體系,微泡體系中染料廢水完全脫色需8 min,臭氧氧化處理35 min,對(duì)廢水TOC去除率高達(dá)70%以上。礦化過(guò)程通過(guò)一級(jí)動(dòng)力學(xué)擬合,測(cè)得微泡體系中一級(jí)反應(yīng)速率常數(shù)為0.0343 min-1,比鼓泡體系反應(yīng)速率常數(shù)高一個(gè)數(shù)量級(jí)。在微泡體系中,體系壓力變化對(duì)廢水脫色率及TOC去除率影響較小;在相同處理時(shí)間下,酸性紅18初始濃度越大,脫色率和礦化率越小;進(jìn)口臭氧濃度越高,染料廢水的脫色及礦化效果越好。運(yùn)用色譜-質(zhì)譜聯(lián)用(GC-MS)檢測(cè)了氧化過(guò)程中8種中間產(chǎn)物,并依此推測(cè)出了酸性紅18的降解機(jī)理。在微泡加壓反應(yīng)器強(qiáng)化O_3/Ca(OH)_2體系中,考察了Ca(OH)_2用量、體系壓力、液相溫度、酸性紅18初始濃度以及進(jìn)口臭氧流量及臭氧濃度對(duì)廢水脫色及TOC去除影響。在0~3 g/L間,廢水脫色和礦化效率隨著Ca(OH)_2加入量的增加而增加,最佳Ca(OH)_2用量為2 g/L。廢水脫色率及TOC去除率受體系壓力、溫度影響較小;在相同處理時(shí)間下,酸性紅18初始濃度越大,脫色率和礦化率越小;臭氧進(jìn)口濃度和進(jìn)口流量的增加有利于酸性紅18脫色與礦化。O_3/Ca(OH)_2體系中強(qiáng)化機(jī)理為Ca(OH)_2電離產(chǎn)生OH-和Ca~(2+),在OH-/O_3條件下有利于羥基自由基產(chǎn)生,同時(shí)Ca~(2+)及時(shí)去除羥基自由基清除劑CO_32-生成CaCO_3沉淀,從而使反應(yīng)能持續(xù)高效進(jìn)行。
[Abstract]:Dyestuff wastewater is characterized by large quantity of water, complex water quality, deep chroma, and containing three toxic substances. If not properly handled, will cause serious environmental pollution, thereby endangering human health. In dye wastewater treatment, ozone oxidation technology has been widely studied because of its high efficiency and no secondary pollution. However, the traditional ozonation technology hinders the development of industrial application because of its high cost, low mass transfer efficiency and low ozone utilization. In this study, a microbubble pressurized reactor was designed to enhance the ozonation process to oxidize and degrade acid red 18 (AR 18) dye wastewater. The VOF model was used to simulate the effect of applied pressure field on the gas-liquid interface in the microbubble reactor, and the effects of the reactor on ozone mass transfer, wastewater decolorization and mineralization (TOC removal efficiency) were investigated. At the same time, the effect of the combined technology on the mineralization and degradation of dye wastewater and its strengthening mechanism were studied. The main results are as follows: the mass transfer efficiency of microbubble pressurized reactor was improved effectively, and the ozone concentration in liquid phase reached stable state faster than that in bubbling system. The ozone concentration in liquid phase was about 11. 7 mg/L, higher than that in bubbling system. The hydroxyl radical production in the microbubble pressurized reactor was higher than that in the traditional bubbling system. The free concentration of hydroxyl radical in the ozone permeated 5 min, microbubble system was up to 121.45 渭 M, which was about 11 times higher than that in the bubbling system. The concentration of ozone and the amount of hydroxyl radical in liquid phase are less affected by pressure, and the effect of temperature is greater. The concentration of ozone in water decreases with the increase of temperature, and the production of hydroxyl radical increases with the increase of temperature. Both increase with the increase of import ozone concentration and flow rate. The decolorization and mineralization efficiency of wastewater in microbubble reaction system is higher than that in bubbling system. The complete decolorization of dye wastewater in microbubble system requires 8 min, ozonation treatment for 35 min, to remove TOC from wastewater up to 70%. The first-order reaction rate constant of 0.0343 min-1, in the microbubble system is one order of magnitude higher than that of the bubbling system. Under the same treatment time, the higher the initial concentration of acid red 18, the smaller the decolorization rate and mineralization rate, the higher the import ozone concentration, the lower the decolorization rate and mineralization rate. The better the decolorization and mineralization of dye wastewater. Eight intermediates in the oxidation process were detected by GC-MS, and the degradation mechanism of acid red 18 was deduced. The effects of the amount of Ca (OH) _ 2, system pressure, temperature of liquid phase, initial concentration of acid red 18, inlet ozone flow rate and ozone concentration on the decolorization and TOC removal of wastewater were investigated in a microbubble pressurized reactor enhanced O_3/Ca (OH) _ 2 system. In the range of 0 g / L, the efficiency of decolorization and mineralization of waste water increases with the increase of Ca (OH) _ 2 addition. The optimal Ca (OH) _ 2 dosage is 2 g / L. The decolorization rate and TOC removal rate of wastewater are less affected by system pressure and temperature, and the higher the initial concentration of acid red 18 is, the smaller the decolorization rate and mineralization rate are under the same treatment time. The increase of ozone inlet concentration and inlet flow rate is beneficial to decolorization and mineralization of acid red 18. O _ (3 / Ca (OH) _ 2) system. The enhancement mechanism is that Ca (OH) _ 2 ionization produces OH- and Ca~ (2), and under OH-/O_3 condition, hydroxyl radical is produced. At the same time, Ca~ (2) removes hydroxyl radical scavenger CO_32- in time to form CaCO_3 precipitate, so that the reaction can be carried on continuously and efficiently.
【學(xué)位授予單位】：重慶理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X788
[Abstract]:Dyestuff wastewater is characterized by large quantity of water, complex water quality, deep chroma, and containing three toxic substances. If not properly handled, will cause serious environmental pollution, thereby endangering human health. In dye wastewater treatment, ozone oxidation technology has been widely studied because of its high efficiency and no secondary pollution. However, the traditional ozonation technology hinders the development of industrial application because of its high cost, low mass transfer efficiency and low ozone utilization. In this study, a microbubble pressurized reactor was designed to enhance the ozonation process to oxidize and degrade acid red 18 (AR 18) dye wastewater. The VOF model was used to simulate the effect of applied pressure field on the gas-liquid interface in the microbubble reactor, and the effects of the reactor on ozone mass transfer, wastewater decolorization and mineralization (TOC removal efficiency) were investigated. At the same time, the effect of the combined technology on the mineralization and degradation of dye wastewater and its strengthening mechanism were studied. The main results are as follows: the mass transfer efficiency of microbubble pressurized reactor was improved effectively, and the ozone concentration in liquid phase reached stable state faster than that in bubbling system. The ozone concentration in liquid phase was about 11. 7 mg/L, higher than that in bubbling system. The hydroxyl radical production in the microbubble pressurized reactor was higher than that in the traditional bubbling system. The free concentration of hydroxyl radical in the ozone permeated 5 min, microbubble system was up to 121.45 渭 M, which was about 11 times higher than that in the bubbling system. The concentration of ozone and the amount of hydroxyl radical in liquid phase are less affected by pressure, and the effect of temperature is greater. The concentration of ozone in water decreases with the increase of temperature, and the production of hydroxyl radical increases with the increase of temperature. Both increase with the increase of import ozone concentration and flow rate. The decolorization and mineralization efficiency of wastewater in microbubble reaction system is higher than that in bubbling system. The complete decolorization of dye wastewater in microbubble system requires 8 min, ozonation treatment for 35 min, to remove TOC from wastewater up to 70%. The first-order reaction rate constant of 0.0343 min-1, in the microbubble system is one order of magnitude higher than that of the bubbling system. Under the same treatment time, the higher the initial concentration of acid red 18, the smaller the decolorization rate and mineralization rate, the higher the import ozone concentration, the lower the decolorization rate and mineralization rate. The better the decolorization and mineralization of dye wastewater. Eight intermediates in the oxidation process were detected by GC-MS, and the degradation mechanism of acid red 18 was deduced. The effects of the amount of Ca (OH) _ 2, system pressure, temperature of liquid phase, initial concentration of acid red 18, inlet ozone flow rate and ozone concentration on the decolorization and TOC removal of wastewater were investigated in a microbubble pressurized reactor enhanced O_3/Ca (OH) _ 2 system. In the range of 0 g / L, the efficiency of decolorization and mineralization of waste water increases with the increase of Ca (OH) _ 2 addition. The optimal Ca (OH) _ 2 dosage is 2 g / L. The decolorization rate and TOC removal rate of wastewater are less affected by system pressure and temperature, and the higher the initial concentration of acid red 18 is, the smaller the decolorization rate and mineralization rate are under the same treatment time. The increase of ozone inlet concentration and inlet flow rate is beneficial to decolorization and mineralization of acid red 18. O _ (3 / Ca (OH) _ 2) system. The enhancement mechanism is that Ca (OH) _ 2 ionization produces OH- and Ca~ (2), and under OH-/O_3 condition, hydroxyl radical is produced. At the same time, Ca~ (2) removes hydroxyl radical scavenger CO_32- in time to form CaCO_3 precipitate, so that the reaction can be carried on continuously and efficiently.
【學(xué)位授予單位】：重慶理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X788
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