本文選題：靈武垃圾填埋場　切入點(diǎn)：污染模擬　出處：《長安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：生活垃圾填埋場作為生活垃圾的處理場所和最終歸宿,對于城市發(fā)展、環(huán)境保護(hù)、資源合理開發(fā)利用等起著舉足輕重的作用。填埋法因其投資小、易操作、技術(shù)成熟等優(yōu)勢躋身為生活垃圾最主要的處理方法,然而填埋垃圾在自身壓實(shí)、發(fā)酵等生物物理化學(xué)作用和降雨的共同作用下會(huì)產(chǎn)生大量有機(jī)或無機(jī)的高濃度滲濾液,若處置不當(dāng)或發(fā)生泄漏,將對周邊地下水環(huán)境和居民健康帶來極大的隱患。本文選取寧夏回族自治區(qū)靈武市靈武無害化生活垃圾填埋場為研究對象,在野外實(shí)地調(diào)研、資料收集、取樣分析的基礎(chǔ)上,對靈武垃圾填埋場及其周邊的地下水進(jìn)行了水質(zhì)評價(jià)和健康風(fēng)險(xiǎn)評價(jià),用MODFLOW模擬了防滲層未破損和防滲層破損5%的情況下,滲濾液中主要污染物As在地下水中的運(yùn)移情況,并進(jìn)行了深入分析和討論。主要結(jié)論如下:(1)研究區(qū)補(bǔ)、徑、排條件較為簡單,補(bǔ)給項(xiàng)為大氣降水與側(cè)向徑流補(bǔ)給,其中大氣降水量為7.79×104m3/a,約占總補(bǔ)給量的30%。地下水的排泄途徑為側(cè)向徑流排泄,排泄量24.47×104m3/a。(2)研究區(qū)地下水中溶解性總固體、氨氮、總硬度、高錳酸鹽指數(shù)、氟化物和亞硝酸鹽氮等指標(biāo)超標(biāo),超標(biāo)率分別為66.7%、83.3%、83.3%、66.7%、100%和16.7%。取樣點(diǎn)的水質(zhì)綜合評價(jià)結(jié)果均為極差。(3)通過飲用含As地下水導(dǎo)致的致癌風(fēng)險(xiǎn)約為1.99×10-6,通過皮膚接觸含As地下水導(dǎo)致的致癌風(fēng)險(xiǎn)值約為3.41×10-11;飲用研究區(qū)含氟化物地下水的危害商為3.18,皮膚接觸研究區(qū)含氟化物地下水的危害商為5.44×10-5。所有水樣的飲用途徑非致癌風(fēng)險(xiǎn)都大于可接受危害商1。(4)以滲濾液中實(shí)測As濃度0.295mg/L作為初始濃度代入模型,對垃圾填埋場及周邊地下水分三種情況進(jìn)行了30年的模擬和預(yù)測:在防滲完好情況下,地下水中砷的濃度沒有超標(biāo);在垃圾填埋場區(qū)防滲膜破損5%、滲濾池防滲正常的情況下,地下水中的砷含量增長但未超標(biāo),垃圾填埋場滲濾液對地下水產(chǎn)生了影響;在垃圾填埋場區(qū)和滲濾池防滲膜均破損5%的情況下,地下水中砷的濃度在滲漏初期就已經(jīng)超標(biāo),且隨著模擬時(shí)間而增大。模型運(yùn)行18年,垃圾填埋場區(qū)下游140m范圍內(nèi)砷濃度超標(biāo)。
[Abstract]:As the disposal place and final destination of domestic waste, landfill plays an important role in urban development, environmental protection, and rational exploitation and utilization of resources. Because of its small investment, landfill is easy to operate. Technology maturity and other advantages are among the most important treatment methods for domestic refuse. However, under the combination of biophysical and chemical effects such as self-compaction, fermentation and rainfall, landfill waste will produce a large number of organic or inorganic high concentration leachate. If improper disposal or leakage occurs, it will bring great hidden danger to the surrounding groundwater environment and residents' health. In this paper, Lingwu harmless domestic refuse landfill in Lingwu City, Ningxia Hui Autonomous region, is selected as the research object, and field investigation is carried out in the field. On the basis of data collection and sampling analysis, the groundwater quality and health risk assessment of Lingwu landfill site and its surrounding area were carried out. MODFLOW was used to simulate the condition that the impermeable layer was not damaged and the impermeable layer was damaged by 5%. The transport of as, the main pollutant in leachate, in groundwater is analyzed and discussed in depth. The main conclusions are as follows: 1) in the study area, the conditions of compensation, diameter and discharge are relatively simple, and the recharge terms are atmospheric precipitation and lateral runoff recharge. The atmospheric precipitation is 7.79 脳 10 ~ 4 m ~ (3 / a), accounting for about 30% of the total recharge. The discharge way of groundwater is lateral runoff discharge, and the discharge amount is 24.47 脳 10 ~ (4) m ~ (3 / a) a.f.) the total dissolved solids, ammonia nitrogen, total hardness, permanganate index in groundwater in the study area. Fluorides and nitrite nitrogen and other indicators exceed the standard, The rate of exceeding the standard is 66.7% and 16.77.The comprehensive evaluation results of the water quality of the sampling points are extremely poor.) the carcinogenic risk caused by drinking as groundwater is about 1.99 脳 10 ~ (-6), and the carcinogenic risk value caused by skin contact with as groundwater is about 3.41 脳 10 ~ (-11). The hazard quotient of fluorinated groundwater was 3.18, the hazard quotient of fluorinated groundwater in skin contact study area was 5.44 脳 10 ~ (-5). The non-carcinogenic risk of drinking route of all water samples was higher than that of acceptable hazard quotient (1.44).) the measured as concentration in leachate was 0.295 mg / L. As an initial concentration substitution model, In this paper, three kinds of conditions of landfill and surrounding groundwater are simulated and forecasted for 30 years: in the case of intact seepage prevention, the concentration of arsenic in groundwater is not over the standard; in the case of 5% damage of impervious membrane and normal seepage control of filter in landfill area, the concentration of arsenic in groundwater does not exceed the standard. The content of arsenic in groundwater increases but does not exceed the standard, the leachate of landfill has an effect on the groundwater, and the concentration of arsenic in groundwater has exceeded the standard in the early stage of leakage, when the impervious membrane of landfill site and seepage filter is damaged by 5%, The model was operated for 18 years, and the arsenic concentration exceeded the standard in the range of 140 m downstream of the landfill site.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X523;X799.3

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相關(guān)期刊論文 前1條

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本文編號(hào)：1564390