本文關(guān)鍵詞： 垂直流人工濕地 沸石基質(zhì) LDHs 覆膜改性 氮 磷 有機(jī)物　出處：《武漢理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：針對(duì)垂直流人工濕地LDHs覆膜改性沸石基質(zhì)對(duì)有機(jī)物、氮、磷的凈化效果進(jìn)行研究,以構(gòu)建的模擬垂直流人工濕地小試系統(tǒng)為基礎(chǔ),采用武漢市沙湖污水處理廠細(xì)格柵前進(jìn)水為實(shí)驗(yàn)原水,進(jìn)行了為期一年的沸石基質(zhì)改性及其凈化效果實(shí)驗(yàn)研究。通過LDHs覆膜改性沸石基質(zhì)對(duì)水體中主要污染物凈化效果的分析,為基質(zhì)的選擇、改性方式的選擇及改性基質(zhì)凈化機(jī)理的研究提供理論依據(jù)。本研究包括兩部分內(nèi)容:沸石基質(zhì)改性實(shí)驗(yàn);模擬垂直流人工濕地系統(tǒng)對(duì)污水的凈化實(shí)驗(yàn)。主要研究成果如下:1、通過掃描電鏡圖觀察LDHs覆膜改性基質(zhì)的表面特征,通過X射線熒光光譜儀法觀察改性前后沸石的組成成分,證明LDHs成功覆膜;2、通過對(duì)有機(jī)物、氮、磷去除效果的凈化實(shí)驗(yàn)結(jié)果可知,改性基質(zhì)對(duì)磷的去除效果較為明顯,而對(duì)有機(jī)物和氮的去除效果次之;3、根據(jù)對(duì)凈化實(shí)驗(yàn)結(jié)果的分析可以判斷,沸石對(duì)有機(jī)物的去除機(jī)理應(yīng)為化學(xué)吸附和生物吸附,沸石對(duì)氮的去除機(jī)理為微生物的硝化和反硝化作用,沸石對(duì)磷的去除機(jī)理為物理攔截、微生物吸附以及離子交換;4、從不同粒徑沸石對(duì)各種污染物指標(biāo)的凈化效果綜合來看:小粒徑㧐中粒徑㧐大粒徑;5、9種不同類型LDHs改性的沸石基質(zhì)對(duì)各種污染物的凈化效果各不相同,其中對(duì)有機(jī)物處理效果較好是中粒徑的Co Ca-LDHs;改性沸石對(duì)總氮的處理效果較好的是小粒徑的Fe Mg-LDHs和中、大粒徑的Co Ca-LDHs;改性沸石對(duì)氨氮的處理效果較好的是小、中粒徑的Fe Mg-LDHs和大粒徑的Al Ca-LDHs;改性沸石對(duì)總磷的處理效果較好的是小粒徑的Fe Zn-LDHs;改性沸石對(duì)磷酸鹽的處理效果較好的是各種粒徑沸石中含有Zn2+的改性基質(zhì)。我們可針對(duì)不同水質(zhì)選擇不同粒徑的原始基質(zhì)以及不同金屬離子搭配的LDHs改性類型進(jìn)行基質(zhì)改性,以達(dá)到最佳的凈化效果。
[Abstract]:The purification effect of LDHs modified zeolite matrix on organic nitrogen and phosphorus in vertical flow constructed wetland was studied based on the simulated vertical flow constructed wetland small scale test system. The fine grid forward water of Shahu sewage treatment plant in Wuhan was used as the experimental raw water. The modification of zeolite matrix and its purifying effect were studied for one year. Through the analysis of the purifying effect of LDHs coated zeolite matrix on the main pollutants in the water body, the selection of the matrix was carried out. The selection of modification methods and the study of purification mechanism of modified matrix provide theoretical basis. This research includes two parts: zeolite matrix modification experiment; The main research results are as follows: 1. The surface characteristics of LDHs film coated modified matrix were observed by scanning electron microscope (SEM). The composition of zeolite before and after modification was observed by X-ray fluorescence spectrometer. It was proved that LDHs was successfully coated. 2. The results of purifying the removal efficiency of organic matter, nitrogen and phosphorus show that the removal effect of the modified substrate is obvious, and the removal effect of organic matter and nitrogen is the second. 3According to the analysis of the results of purification experiment, it can be concluded that the removal mechanism of organic matter by zeolite should be chemisorption and biosorption, and the removal mechanism of nitrogen by zeolite is nitrification and denitrification of microorganisms. The removal mechanism of phosphorus by zeolite is physical interception, microbial adsorption and ion exchange. 4. According to the purifying effect of zeolites with different particle sizes on various pollutant indexes: small particle size? Medium size? Large particle size; (5) 9 kinds of zeolite matrix modified by LDHs have different purifying effects on various pollutants, among them, the best treatment effect for organic matter is Co Ca-LDHs with medium particle size. The effect of modified zeolite on the treatment of total nitrogen is better than that of Fe Mg-LDHs with small particle size and Co Ca-LDHs with medium and large particle size. The effect of modified zeolite on ammonia nitrogen treatment is small, medium size Fe Mg-LDHs and large particle size Al Ca-LDHs. The effect of modified zeolite on the treatment of total phosphorus is better than that of small particle size Fe Zn-LDHs. The effect of modified zeolites on phosphate treatment is better than that of zeolites with various particle sizes containing Zn2. We can select the original matrix with different particle size and the modified type of LDHs with different metal ions for different water quality. To achieve the best purification effect.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X703

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