本文關(guān)鍵詞： 化工廠 場(chǎng)地 風(fēng)險(xiǎn)評(píng)估 修復(fù)設(shè)計(jì)　出處：《成都理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著城市化進(jìn)程加快,產(chǎn)業(yè)結(jié)構(gòu)調(diào)整深化,許多城市開始將主城區(qū)的工業(yè)企業(yè)遷移,產(chǎn)生大量存在環(huán)境風(fēng)險(xiǎn)的場(chǎng)地。某化工廠1987年建成,2009年停產(chǎn)搬遷,期間主要以生產(chǎn)農(nóng)藥產(chǎn)品為主,遺留的場(chǎng)地可能存在土壤污染。以該化工場(chǎng)遺留場(chǎng)地為研究對(duì)象,對(duì)搬遷后的場(chǎng)地實(shí)施土壤污染風(fēng)險(xiǎn)評(píng)估,在室內(nèi)試驗(yàn)研究污染土壤的修復(fù)工藝,并在風(fēng)險(xiǎn)評(píng)估和室內(nèi)修復(fù)工藝試驗(yàn)研究的基礎(chǔ)上對(duì)污染場(chǎng)地進(jìn)行修復(fù)工程設(shè)計(jì),以期實(shí)現(xiàn)對(duì)該場(chǎng)地的污染修復(fù),同時(shí)為同類污染場(chǎng)地的風(fēng)險(xiǎn)評(píng)估與場(chǎng)地修復(fù)提供借鑒意義,形成了以下主要結(jié)論或設(shè)計(jì)成果:(1)通過(guò)場(chǎng)地環(huán)境,對(duì)原污染場(chǎng)地進(jìn)行危害識(shí)別,確定了主要關(guān)注目標(biāo)污染物。(2)對(duì)場(chǎng)地健康風(fēng)險(xiǎn)評(píng)估,確定對(duì)人體健康具有風(fēng)險(xiǎn)效應(yīng)的污染物有:苯、乙苯、氯苯、二甲苯(總)、1,2二氯乙烷、狄氏劑、α-六六六、β-六六六、γ-六六六、汞、鎳、鎘、砷、鋅、銅。對(duì)以上污染物進(jìn)行了人體暴露評(píng)估、毒性評(píng)估、風(fēng)險(xiǎn)表征最后得出了風(fēng)險(xiǎn)控制值。(3)確定對(duì)有機(jī)污染土壤修復(fù)采用乙醇淋洗工藝,重金屬污染土壤采用固化穩(wěn)定化的工藝。通過(guò)修復(fù)工藝試驗(yàn)研究得出:苯的土壤與乙醇平衡常數(shù)Kp=6.56;工藝試驗(yàn)條件為:乙醇濃度100%,淋洗次數(shù)為4次,超聲時(shí)間為20min,土壤與乙醇的質(zhì)量體積比為1:10,最終土壤中濃度為2.16mg/kg,去除率最高達(dá)到97.54%,結(jié)果表明采用乙醇淋洗的方法可以有效去除土壤中的有機(jī)物。重金屬污染土壤采用固化穩(wěn)定化方法的修復(fù)工藝條件為:水泥加入量為300%,粉煤灰加入量30%,石灰加入量為10%時(shí)固化穩(wěn)定化效果最好,浸出液中重金屬Cd濃度為11.4mg/L,去除率達(dá)到98.86%。(4)在對(duì)該場(chǎng)地有機(jī)物污染土壤的修復(fù)設(shè)計(jì)后,根據(jù)實(shí)際情況計(jì)算得出,苯污染土壤清洗3次達(dá)到修復(fù)目標(biāo)值。確定修復(fù)的開挖土方量1224.78m3,濕重2118.87t,需要損耗乙醇42.38m3。對(duì)該場(chǎng)地重金屬污染土壤的修復(fù)設(shè)計(jì),需要修復(fù)污染土壤1177.76 m3,濕重2037.5t,經(jīng)過(guò)挖掘土壤增容,需要固化的體積為重金屬污染土壤有2882 m3,需要損耗水泥12469t,粉煤灰416t,石灰208t。該場(chǎng)地固化體處置場(chǎng)體積為6342.6m3,處置場(chǎng)寬度20m,長(zhǎng)度158.6m,總深度為5.5m。
[Abstract]:With the acceleration of urbanization and the deepening of industrial structure adjustment, many cities began to relocate industrial enterprises in the main urban areas, resulting in a large number of sites with environmental risks. A chemical plant was completed in 1987 and stopped production and relocation in 2009. During this period, pesticide products are mainly produced, and the sites left over may have soil pollution. Taking the remaining sites of the chemical plant as the research object, the risk assessment of soil pollution will be carried out on the relocated sites. The remediation technology of contaminated soil was studied in laboratory test, and the remediation engineering design of contaminated site was carried out on the basis of risk assessment and indoor remediation process test, in order to realize the remediation of the contaminated soil. At the same time, it provides reference for the risk assessment and site restoration of the same polluted sites, and forms the following main conclusions or design results: 1) identifying the hazards of the original contaminated sites through the site environment, Identified as the main target pollutant of concern, assessment of site health risks, and identified as having a risk effect on human health the following pollutants: benzene, ethylbenzene, chlorobenzene, xylene (Dichloroethane, dieldrin, 偽-666, 尾-666, 緯-666), Mercury, nickel, cadmium, arsenic, zinc, copper. Human exposure assessment, toxicity assessment and risk characterization of the above pollutants were carried out. Finally, the risk control value was obtained. 3) Ethanol-eluting process was used for remediation of organic contaminated soil. Heavy metal contaminated soils were treated by solidification and stabilization. The results of remediation experiments showed that the equilibrium constant of benzene with ethanol was 6.56, and the experimental conditions were as follows: 100% ethanol concentration, 4 times of elution, 4 times of leaching. The ultrasonic time is 20 min, the mass volume ratio of soil to ethanol is 1: 10, the final soil concentration is 2.16 mg / kg, and the highest removal rate is 97.54%. The results show that ethanol elution can effectively remove organic matter in soil and heavy metal contaminated soil. The process conditions of curing stabilization are as follows: cement is 300, fly ash is 30, lime is 10, curing and stabilizing is the best. The concentration of CD in the leaching solution is 11.4 mg / L and the removal rate is 98.86. 4) after the remediation design of the soil contaminated by organic matter in the site, it is calculated according to the actual situation. Benzene contaminated soil was cleaned for 3 times to reach the target value of remediation. It was determined that the amount of excavated earthwork was 1224.78 m3, the wet weight was 2118.87 t, and the loss of ethanol was 42.38 m 3.The remediation design of heavy metal contaminated soil in the site required the remediation of contaminated soil 1177.76 m3, wet weight 2037.5t, and the capacity of excavated soil was increased. The volume needed to be solidified was 2882 m3 in contaminated soil, 12469t in cement, 416t in fly ash and 208t in lime. The volume of site was 6342.6m3, the width of site was 20m, the length was 158.6m, and the total depth was 5.5m.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X82;X78

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本文編號(hào)：1537624