發(fā)布時(shí)間：2018-05-31 19:47

  本文選題：三氯生 + 土壤污染�。� 參考：《江蘇大學(xué)》2017年碩士論文

【摘要】：目前土壤污染日益突出,成為一個(gè)嚴(yán)重的問(wèn)題,因而土壤修復(fù)也就成為了環(huán)境領(lǐng)域中具有發(fā)展前景的研究領(lǐng)域。個(gè)人護(hù)理產(chǎn)品和藥物逐漸成為一種新興的土壤污染物,而這些污染物由于其在最初的使用領(lǐng)域具有低濃度,急性毒害小的特點(diǎn)不被關(guān)注。本文的研究對(duì)象為三氯生,其作為一種廣譜抗菌劑,大量使用于系列個(gè)人和家庭產(chǎn)品中,如香皂、紡織物、玩具和涂料中�，F(xiàn)在,三氯生已經(jīng)被認(rèn)定為土壤環(huán)境中廣泛存在的十大有機(jī)污染物之一。盡管三氯生的極性毒性并不高,但是其在環(huán)境中難以降解,易干擾人體內(nèi)分泌,影響細(xì)胞基因的表達(dá),是一種新型環(huán)境污染物。目前土壤修復(fù)技術(shù)不斷發(fā)展,傳統(tǒng)的土壤修復(fù)技術(shù)大致可劃分為三類,即物理修復(fù)、化學(xué)修復(fù)以及生物修復(fù)。隨著科技發(fā)展和研究的不斷深入,一些復(fù)合修復(fù)技術(shù)也逐漸興起。復(fù)合修復(fù)技術(shù)是指由兩種或者兩種以上的修復(fù)方法共同作用的治理污染土壤的修復(fù)技術(shù)。本研究設(shè)計(jì)開(kāi)發(fā)了基于磁場(chǎng)強(qiáng)化的電動(dòng)復(fù)合修復(fù)技術(shù),用于三氯生污染土壤的修復(fù)研究,其作為一種高效、低成本、無(wú)污染的修復(fù)技術(shù)具有良好的發(fā)展前景。本試驗(yàn)構(gòu)建了新型的磁場(chǎng)強(qiáng)化的電動(dòng)修復(fù)土壤的修復(fù)系統(tǒng),并深入研究其對(duì)三氯生污染土壤的修復(fù)效果,取得了主要研究成果如下:⑴首先,建立了土壤中三氯生的回收和檢測(cè)方法,同時(shí)開(kāi)展了三氯生的吸附動(dòng)力學(xué)研究。試驗(yàn)結(jié)果表明1.0g土壤用50mL的甲醇兩次超聲萃取后,三氯生回收率在92.17%~96.45%之間,281nm檢測(cè)波長(zhǎng),取得良好出峰效果;土壤對(duì)三氯生的吸附在1000分鐘內(nèi)即可完成;三氯生的解吸試驗(yàn)結(jié)果表明三氯生在土壤中的吸附過(guò)程是不可逆的。⑵其次,研究了含水率和電極形狀對(duì)磁強(qiáng)化電動(dòng)修復(fù)的影響,確定試驗(yàn)過(guò)程中土壤含水率為35.0%,采用石墨片狀電極。正交優(yōu)化試驗(yàn)結(jié)果表明,電勢(shì)梯度和磁場(chǎng)強(qiáng)度增大對(duì)修復(fù)效果提高都有促進(jìn)作用,污染物濃度越低,這種促進(jìn)作用越明顯。當(dāng)試驗(yàn)中電壓梯度為3v/cm,磁場(chǎng)強(qiáng)度設(shè)置為80mT,污染物濃度為1000mg/kg時(shí),污染物三氯生取得最大去除率50.7%。⑶最后,分析了磁強(qiáng)化電動(dòng)修復(fù)試驗(yàn)對(duì)土壤的pH、含水率、電導(dǎo)率以及溫度等理化性質(zhì)的影響。試驗(yàn)中每隔10小時(shí)記錄一次土壤的溫度,試驗(yàn)結(jié)束后測(cè)量了土壤的pH、含水率、電導(dǎo)率。土壤pH在陽(yáng)極區(qū)降低,陰極區(qū)升高,這是由于水電解反應(yīng)在電極區(qū)產(chǎn)生了大量的氫氧根和氫離子,pH分布結(jié)果表明磁場(chǎng)促進(jìn)了酸堿中和面向陰極遷移;土壤室的土壤含水率分布均勻,與初始狀態(tài)比呈穩(wěn)定狀態(tài),溫度變化波動(dòng)范圍也較小;電極槽內(nèi)土壤含水率和土壤溫度呈周期性波動(dòng),這是由于電極槽內(nèi)電解液采用周期性投加;土壤區(qū)含水率從陽(yáng)極向陰極區(qū)逐漸升高;土壤區(qū)的電導(dǎo)率呈兩端高中間低的現(xiàn)象,即電導(dǎo)率在陽(yáng)極區(qū)和陰極區(qū)較高,中間區(qū)最低。
[Abstract]:Soil pollution has become a serious problem, so soil remediation has become a promising research field in the field of environment. Personal care products and drugs have gradually become a new soil pollutant, which is not concerned because of its low concentration in the field of initial use. As a broad-spectrum antimicrobial agent, triclosan is widely used in a series of personal and domestic products, such as soap, textiles, toys and paints. Now, triclosan has been identified as one of the ten most widespread organic pollutants in the soil environment. Although the polar toxicity of triclosan is not high, it is difficult to degrade in the environment, easy to interfere with human endocrine and affect the expression of cell genes, so it is a new environmental pollutant. At present, soil remediation technology is developing continuously. The traditional soil remediation technology can be divided into three categories: physical remediation, chemical remediation and bioremediation. With the development of science and technology and the development of research, some composite repair technology is also rising. Composite remediation technology refers to the remediation of contaminated soil by two or more remediation methods. In this study, an electric composite remediation technology based on magnetic field was designed and developed, which can be used in the remediation of trichlorogenic contaminated soil. As a highly efficient, low-cost and pollution-free remediation technology, it has a good prospect. In this experiment, a new magnetic field enhanced electric remediation system for soil was constructed, and its remediation effect on trichlorogenic contaminated soil was studied in depth. The main research results are as follows: 1. A method for the recovery and detection of triclosan in soil was established, and the adsorption kinetics of triclosan was studied. The results showed that the recovery rate of triclosan was 92.17% ~ 96.45% after twice ultrasonic extraction with 50 mL methanol in 1.0 g soil, and the detection wavelength of 281nm was obtained, and the adsorption of triclosan on soil could be completed within 1000 minutes. The desorption test of triclosan showed that the adsorption process of triclosan in soil was irreversible. Secondly, the effects of water content and electrode shape on magnetically enhanced electrokinetic remediation were studied. The soil moisture content was determined to be 35.0 and graphite sheet electrode was used. The results of orthogonal optimization test show that the increase of potential gradient and magnetic field intensity can promote the improvement of remediation effect, and the lower the concentration of pollutants, the more obvious this effect is. When the voltage gradient was 3 v / cm, the magnetic field intensity was set to 80 Mt, and the pollutant concentration was 1000mg/kg, the maximum removal rate of trichloroethylene was 50.7.3. Finally, the pH and moisture content of the soil were analyzed. Effects of electrical conductivity and temperature on physical and chemical properties. The soil temperature was recorded every 10 hours. The pH, water content and conductivity of the soil were measured after the experiment. The pH of soil decreased in the anode region and increased in the cathode area, which was due to a large amount of hydroxide and hydrogen ion pH distribution in the electrode region produced by the water electrolysis reaction. The results showed that the magnetic field promoted the migration of acid and base and toward the cathode. The distribution of soil moisture content in soil chamber is uniform, and the ratio of soil moisture content to initial state is stable, and the range of temperature fluctuation is small, and the soil moisture content and soil temperature in electrode tank fluctuate periodically. This is due to the periodic addition of electrolyte in the electrode cell, the increase of soil moisture content from anode to cathode, and the phenomenon that the conductivity of soil area is high and low at both ends, that is, the conductivity is higher in the anode and cathode area, and the lowest in the middle zone.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X53

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 甘志永;王海棠;劉浩;;污染土壤修復(fù)技術(shù)及研究前沿與展望[J];中國(guó)資源綜合利用;2016年06期

2 莊國(guó)泰;;我國(guó)土壤污染現(xiàn)狀與防控策略[J];中國(guó)科學(xué)院院刊;2015年04期

3 鄭建中;石美;李娟;郭彩陽(yáng);張良;;化學(xué)還原固定化土壤地下水中六價(jià)鉻的研究進(jìn)展[J];環(huán)境工程學(xué)報(bào);2015年07期

4 孫濤;陸扣萍;王海龍;;不同淋洗劑和淋洗條件下重金屬污染土壤淋洗修復(fù)研究進(jìn)展[J];浙江農(nóng)林大學(xué)學(xué)報(bào);2015年01期

5 包平;周露;;基于Citespace的學(xué)科服務(wù)可視化研究[J];農(nóng)業(yè)圖書情報(bào)學(xué)刊;2014年07期

6 李順偉;;施肥過(guò)量的危害及對(duì)應(yīng)措施探討[J];中小企業(yè)管理與科技(上旬刊);2013年11期

7 李杰;郭曉宏;姜亢;呂鵬輝;;安全科學(xué)知識(shí)圖譜的初步研究——以《Safety Science》期刊數(shù)據(jù)為例[J];中國(guó)安全科學(xué)學(xué)報(bào);2013年04期

8 徐小希;陳胡星;劉浩;李靜;唐先進(jìn);;水泥基材料對(duì)鉻污染土壤的固化/穩(wěn)定化研究[J];材料導(dǎo)報(bào);2012年18期

9 甘文君;何躍;張孝飛;張勝田;林玉鎖;;秸稈生物炭修復(fù)電鍍廠污染土壤的效果和作用機(jī)理初探[J];生態(tài)與農(nóng)村環(huán)境學(xué)報(bào);2012年03期

10 宋飛;葛紅花;鄧宇強(qiáng);張祥金;楊海軍;;磁處理對(duì)水溶液及CaCO_3顆粒物理化學(xué)性質(zhì)的影響[J];水處理技術(shù);2012年03期

相關(guān)碩士學(xué)位論文 前1條

1 李程峰;紅壤中鎘的吸附行為及其電動(dòng)力去除研究[D];湖南大學(xué);2004年

，

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