本文選題：超臨界水氧化 + 總有機(jī)碳��； 參考：《浙江工業(yè)大學(xué)》2015年碩士論文

【摘要】：超臨界水氧化法能夠使有機(jī)污染物在超臨界水中迅速、徹底地氧化,根據(jù)課題組之前一系列的研究表明:超臨界水氧化法測定水樣中的總有機(jī)碳值是切實(shí)可行的,但總有機(jī)碳(TOC)檢測所需的溫度相對較高,加入氧化劑的量較多,氧化劑利用效率低,因此有必要通過實(shí)驗(yàn)研究進(jìn)一步改善和優(yōu)化。選擇高錳酸鉀、重鉻酸鉀、雙氧水三種氧化劑,在超臨界水氧化的條件下測定含鄰苯二甲酸氫鉀模擬廢水的總有機(jī)碳,探索不同氧化劑、溫度、氧化劑倍數(shù)等因素對廢水中總有機(jī)碳檢測的影響機(jī)制。結(jié)果表明:在溫度440℃,氧化劑倍數(shù)n=10的情況下,雙氧水作為氧化劑時TOC檢出率可達(dá)98%以上;在此條件下,用高錳酸鉀、重鉻酸鉀作為氧化劑時TOC檢出率分別僅約為11%和8%。說明在超臨界水氧化法測定廢水樣品時,雙氧水的氧化能力及效果明顯強(qiáng)于高錳酸鉀或重鉻酸鉀。同時研究在超臨界水氧化的條件下,以芬頓氧化法測定含鄰苯二甲酸氫鉀模擬廢水的總有機(jī)碳。探索pH(2.2~5.2)、Fe2+濃度(0.2~0.8 mg/L)、溫度(380~480℃)、壓力(23.0~25.0 MPa)、氧化劑倍數(shù)(1~20)等因素對廢水中總有機(jī)碳檢測的影響機(jī)制。結(jié)果表明:溫度T=420℃,壓力P=24.0 MPa,氧化劑倍數(shù)n=5,pH=4.4,Fe2+濃度=0.8 mg/L為較優(yōu)的TOC檢測條件,此時測試水樣的TOC檢出率總體上能達(dá)到98%以上,比較同等條件下超臨界水氧化法的TOC檢出率僅約為87%。因此超臨界芬頓氧化法降低了TOC檢測所需的溫度,提高了氧化劑的利用效率。最后,對建立的TOC測定儀的性能進(jìn)行了較全面的測試。對同一個鄰苯二甲酸氫鉀樣品進(jìn)行多次重復(fù)實(shí)驗(yàn),測定裝置的精密度RSD為0.66%;本實(shí)驗(yàn)裝置測定TOC檢出率為99.7~101.2%,與島津總有機(jī)碳分析儀差異不超過1.2%;在鄰苯二甲酸氫鉀模擬廢水樣品的連續(xù)測定中,當(dāng)總有機(jī)碳濃度發(fā)生變化(從低到高,或從高到底)時,30min左右即可得到穩(wěn)定的NDIR信號。表明基于超臨界水氧化建立的TOC測定裝置的精密度高、準(zhǔn)確度好,可實(shí)現(xiàn)連續(xù)檢測,響應(yīng)時間約30min。
[Abstract]:Supercritical water oxidation method can make organic pollutants oxidize rapidly and thoroughly in supercritical water. According to a series of studies before the research group, it is feasible to determine the total organic carbon value of water samples by supercritical water oxidation method. However, the temperature of total organic carbon (TOC) is relatively high, the amount of oxidant is more and the efficiency of oxidant is low, so it is necessary to improve and optimize the TOC by experiment. Three oxidants, potassium permanganate, potassium dichromate and hydrogen peroxide, were selected to determine the total organic carbon of simulated wastewater containing potassium phthalate under the condition of supercritical water oxidation. The mechanism of influencing factors such as oxidant multiple on the detection of total organic carbon (TOC) in wastewater. The results show that the detection rate of TOC is above 98% when hydrogen peroxide is used as oxidant at 440 鈩，

本文編號：2087974