本文選題：對(duì)硝基苯乙酮 + Fenton催化氧化　； 參考：《揚(yáng)州大學(xué)》2017年碩士論文

【摘要】：硝基苯類化合物是重要的化工原料之一,常用在染料、醫(yī)藥等行業(yè)。隨著化工工業(yè)的發(fā)展,硝基苯類化合物不斷的進(jìn)入到人們的生活環(huán)境中。對(duì)硝基苯乙酮廢水含有大量的硝基苯類化合物,高毒性、化學(xué)性質(zhì)穩(wěn)定、難生物降解、進(jìn)入水體污染持續(xù)時(shí)間長等特點(diǎn)。由于該產(chǎn)品生產(chǎn)化工廠很少,導(dǎo)致當(dāng)前對(duì)該種廢水處理仍缺乏相對(duì)成熟的工藝。本文旨在研究物化法和生物法組合工藝對(duì)硝基苯乙酮生產(chǎn)廢水的處理效果和適宜工藝條件。Fenton催化氧化技術(shù)在處理難降解有機(jī)污染物時(shí)具有獨(dú)特的優(yōu)勢(shì),由于試劑成本的較高,一般用于廢水處理的預(yù)處理階段,故選擇Fenton催化氧化進(jìn)行對(duì)硝基苯乙酮生產(chǎn)廢水的化學(xué)預(yù)處理。通過一系列的試驗(yàn)研究,初步探究Fenton催化氧化體系中各因素對(duì)主要污染物降解效果的影響,以及最佳的Fenton試劑投加量。然而廢水經(jīng)過Fenton催化氧化處理后,對(duì)硝基苯乙酮生產(chǎn)廢水可生化性得到明顯的提高,但出水各項(xiàng)指標(biāo)仍未達(dá)到《綜合污水排放標(biāo)準(zhǔn)》。采用水解酸化/好氧對(duì)預(yù)處理后的對(duì)硝基苯乙酮生產(chǎn)廢水進(jìn)一步的生物處理,達(dá)到了對(duì)硝基苯乙酮廢水的最終處理目標(biāo)。同時(shí)采用探索的適宜工藝條件進(jìn)行實(shí)際工程的技術(shù)指導(dǎo),進(jìn)一步的探究該組合工藝對(duì)該種廢水的降解效果。研究表明:1.Fenton催化氧化體系處理對(duì)硝基苯乙酮生產(chǎn)廢水的工藝最佳條件探索試驗(yàn)可得出:a)Fenton催化氧化體中FeS04 · 7H20的投加量對(duì)其影響最大,pH值和雙氧水投加量的影響次之;b)在室溫條件下,當(dāng)FeS04·7H20的投加量為2.5g/L,pH值為3.0,雙氧水的體積分?jǐn)?shù)為0.9%,反應(yīng)時(shí)間為120min時(shí),Fenton處理效果最佳;c)最優(yōu)條件下硝基苯類去除率為94.87%,CODcr的去除率達(dá)到57.58%。2.采用水解酸化/好氧組合處理工藝對(duì)經(jīng)過Fenton催化氧化對(duì)硝基苯乙酮生產(chǎn)廢水進(jìn)行進(jìn)一步的生化實(shí)驗(yàn),達(dá)到了對(duì)硝基苯乙酮生產(chǎn)廢水最終處理目標(biāo)。試驗(yàn)發(fā)現(xiàn),水解酸化能承受的最大進(jìn)水濃度為CODcr=1200mg/L,此時(shí)CODcr去除率達(dá)到55.25%,硝基苯類的去除率為95.61%;水解酸化后出水好氧處理,CODcr總?cè)コ噬仙?9.18%,滿足出水指標(biāo)國家污水綜合排放三級(jí)標(biāo)準(zhǔn)(GB8978-1996)相關(guān)規(guī)定(CODcr500mg/L,硝基苯類含量5mg/L)。3.現(xiàn)場(chǎng)對(duì)硝基苯乙酮生產(chǎn)廢水采用混合酸析-Fenton催化氧化-水解酸化-A/O-臭氧氧化-接觸氧化工藝處理,參照實(shí)驗(yàn)室得出結(jié)果進(jìn)行相關(guān)調(diào)試,出水CODcr為220mg/L(500mg/L)、硝基苯類含量為1.5mg/L(5mg/L)、色度為75倍(80倍)、總氮為35mg/L(75mg/L),各項(xiàng)指標(biāo)達(dá)到園區(qū)管網(wǎng)接收的標(biāo)準(zhǔn),且滿足國家污水綜合排放三級(jí)標(biāo)準(zhǔn)(GB8978-1996),且穩(wěn)定運(yùn)行達(dá)到半年以上。同時(shí)處理廢水成本為3.91元/噸,適合工程化應(yīng)用。
[Abstract]:Nitrobenzene compounds are one of the important chemical raw materials, commonly used in dye, medicine and other industries. With the development of chemical industry, nitrobenzene compounds come into people's living environment. P-nitroacetophenone wastewater contains a large number of nitrobenzene compounds, which is highly toxic, stable in chemical properties, difficult to biodegrade, and has long duration of entering water pollution. Due to the few chemical plants, there is still a lack of mature process for the treatment of this kind of wastewater. The purpose of this paper is to study the treatment effect of p-nitroacetophenone wastewater by physicochemical and biological processes and its suitable conditions. Fenton catalytic oxidation technology has unique advantages in the treatment of refractory organic pollutants, due to the high cost of reagent. It is generally used in the pretreatment stage of wastewater treatment, so Fenton catalytic oxidation is chosen for chemical pretreatment of p-nitroacetophenone production wastewater. Through a series of experimental studies, the effects of various factors on the degradation of main pollutants in Fenton catalytic oxidation system and the optimum dosage of Fenton reagent were studied. However, after Fenton catalytic oxidation, the biodegradability of p-nitroacetophenone wastewater was improved obviously, but the effluent indexes were still not up to the Comprehensive sewage discharge Standard. Further biological treatment of p-nitroacetophenone wastewater was carried out by hydrolytic acidification / aerobic treatment, and the final treatment goal of p-nitroacetophenone wastewater was achieved. At the same time, the technical guidance of practical engineering was carried out under the suitable technological conditions, and the effect of the combined process on the degradation of this kind of wastewater was further explored. The results show that: 1. Fenton catalytic oxidation system for the treatment of p-nitroacetophenone wastewater can be found that the addition of FeS04 7H20 in Fenton catalytic oxidation system has the greatest influence on the pH value and the amount of hydrogen peroxide. At room temperature, When the dosage of FeS04 7H20 is 2.5 g / L ~ (-1) pH = 3.0, the volume fraction of hydrogen peroxide is 0.9, and the reaction time is 120min, the removal rate of nitrobenzene is 94.87% and the removal rate of COD _ (cr) is 57.58 路2. Further biochemical experiments were carried out on the wastewater from p-nitroacetophenone production by Fenton catalytic oxidation with hydrolytic acidification / aerobic treatment process. The final treatment goal of p-nitroacetophenone wastewater was achieved. The experiment found that, The maximum influent concentration of hydrolytic acidification is 1 200 mg / L, the CODcr removal rate is 55.25 and the removal rate of nitrobenzene is 95.61%. Standard GB 8978-1996) related regulations CODCR 500 mg / L, nitrobenzene content 5 mg / L ~ (3). The wastewater from the production of p-nitroacetophenone was treated by mixed acid-eluter-Fenton catalytic oxidation-hydrolytic acidification-A / O -ozone oxidation-contact oxidation process, and the relevant debugging was carried out according to the results obtained from the laboratory. The effluent CODcr is 220 mg / L = 500 mg / L, the content of nitrobenzene is 1.5 mg / L / L ~ (5) mg / L, the chroma is 75 times ~ 80 times, the total nitrogen is 35 mg / L ~ (75) mg / L ~ (-1), all the indexes meet the standard of receiving the park pipe network, and meet the national comprehensive wastewater discharge standard (GB8978-1996), and run steadily for more than half a year. At the same time, the cost of wastewater treatment is 3.91 yuan / ton, which is suitable for engineering application.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X783

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