基于回灌處理滲濾液濃縮液中重金屬的遷移行為研究
發(fā)布時間：2019-02-15 04:36
【摘要】：出于經(jīng)濟(jì)性和可操作性考慮,目前我國衛(wèi)生填埋場產(chǎn)生的滲濾液膜濾濃縮液普遍采用填埋體回灌方法進(jìn)行處理。但目前學(xué)者對濃縮液回灌填埋體中重金屬的遷移轉(zhuǎn)化研究較少,而重金屬的合理去除不僅對保障填埋場周圍土壤和地下水的安全至關(guān)重要,而且對垃圾滲濾液處理設(shè)施的正常運(yùn)行也有明顯影響。因此,本文借助于室內(nèi)模擬試驗(yàn),采用濃縮液回灌的方式,分別研究不同埋齡垃圾介質(zhì)及不同回灌條件下回灌體系中重金屬的遷移行為,確定影響重金屬遷移的主要因素,通過正交方法探討回灌濃縮液中重金屬去除的最優(yōu)回灌參數(shù),并對重金屬的遷移轉(zhuǎn)化行為進(jìn)行了初探。研究結(jié)果表明：埋齡為1年的填埋介質(zhì)對濃縮液中典型重金屬Cu、Zn、Ni、Cr表現(xiàn)出一定的去除作用�；毓嘀芷趦�(nèi),上述四種重金屬的平均去除率依次為：19.58%、39.30%、20.39%和26.12%。5年柱和15年柱中填埋介質(zhì)趨于穩(wěn)定,生物反應(yīng)變?nèi)?隨著填埋體內(nèi)環(huán)境的變化,填埋體內(nèi)重金屬Cu、Zn不斷溶出,Ni則出現(xiàn)回灌前期濃縮液中Ni被去除,后期從填埋體溶出的現(xiàn)象,濃縮液中Cr則得到了有效去除,其中5年柱對濃縮液中Cr去除率分別為16.35%,15年柱對濃縮液中Cr平均去除率為34.58%�；毓嘭�(fù)荷為3.0L/d的重金屬出水濃度明顯低于4.5L/d和6.0L/d,回灌速率為0.2L/min的重金屬出水濃度低于0.3L/min和0.4L/min,說明在回灌系統(tǒng)中,當(dāng)其他因素確定時,隨著回灌負(fù)荷和回灌速率的降低,出水中重金屬濃度也隨著減少,即重金屬出水濃度與回灌負(fù)荷及回灌速率表現(xiàn)出明顯的正相關(guān)關(guān)系。而不同的回灌頻次(1次/d、3次/d、6次/d)和回灌方式(全分布布水、中間布水、四周布水)對出水濃度基本無影響。在最優(yōu)回灌參數(shù)探究試驗(yàn)中,通過正交試驗(yàn)確定了有利于回灌出水中重金屬濃度控制的具體回灌參數(shù),即回灌量為2.0L/d、填埋介質(zhì)粒徑為5mm、調(diào)pH(8.5)、壓實(shí)、回灌速度為0.2L/min。不同回灌參數(shù)中回灌量和回灌介質(zhì)pH對濃縮液回灌出水中重金屬含量的影響最為顯著,且保持較低回灌量(2.0L/d)、高pH(8.5)有利于回灌出水中重金屬的去除�；毓嗲昂筇盥耋w內(nèi)重金屬不同形態(tài)含量的對比研究表明,Cu、Zn、Ni、Cr的遷移率隨著垃圾埋齡的增加而降低,即隨著垃圾穩(wěn)定化進(jìn)程的增加,重金屬遷移率逐漸降低；同時,酸可溶態(tài)重金屬含量對其遷移率有很大影響,重金屬遷移率與酸可溶態(tài)重金屬含量的排序比較一致。四種典型重金屬遷移率從大到小的順序?yàn)椋篫nCuNiCr。以15年柱為例,其遷移率依次為1.81%、1.75%、0.9%和0.68%。Cr存在形式最穩(wěn)定,濃縮液回灌過程中能夠迅速被固定。本研究可為滲濾液反滲透濃縮液回灌系統(tǒng)的合理設(shè)計提供依據(jù),對滲濾液中重金屬的污染防治亦有參考意義。
[Abstract]:In view of economy and maneuverability, leachate membrane concentrate produced from sanitary landfills in China is generally treated by landfill recharge. However, there is little research on the migration and transformation of heavy metals in the recharge landfill, and the reasonable removal of heavy metals is not only important to ensure the safety of the soil and groundwater around the landfill. Moreover, it has obvious influence on the normal operation of landfill leachate treatment facilities. Therefore, with the help of indoor simulation test, the migration behavior of heavy metals in the recharge system of different buried age garbage medium and different recharge conditions was studied by using concentrated liquid recharge method, and the main factors affecting heavy metal migration were determined. The optimal parameters of heavy metal removal in recharge concentrate were studied by orthogonal method, and the migration and transformation of heavy metals were studied. The results showed that the landfill medium with the age of one year could remove the typical heavy metal Cu,Zn,Ni,Cr in the concentrated solution to a certain extent. During the recharge cycle, the average removal rates of the above four heavy metals were 19.58%, 39.30% and 26.12.5 years, respectively, and the landfill medium tended to stabilize, and the biological reaction became weaker, the average removal rate of the above four heavy metals was 19.58%, 39.30% and 26.12.5 years, respectively. With the change of the landfill environment, the heavy metal Cu,Zn in the landfill was dissolved continuously, the Ni was removed from the concentrated solution in the early stage of recharge, the Ni was removed from the landfill at the later stage, and the Cr was effectively removed from the concentrated solution. The removal rates of Cr in concentrated solution were 16.35 for 5 years and 34.58 for Cr in 15 years respectively. The effluent concentration of heavy metals with recharge load of 3.0L/d was significantly lower than that of 4.5L/d and 6.0L / d, and the effluent concentration of heavy metals with recharge rate of 0.2L/min was lower than that of 0.3L/min and 0.4L / min. When other factors were determined, with the decrease of recharge load and recharge rate, the concentration of heavy metals in the effluent water decreased, that is, the concentration of heavy metals in effluent showed a positive correlation with the recharge load and the recharge rate. However, different recharge frequency (1 / d, 3 / d / d, 6 times / d) and recharge methods (full distribution of water, intermediate distribution of water, and distribution of water around) had no effect on the effluent concentration. In the research of optimal recharge parameters, the specific parameters of recharge were determined by orthogonal test, that is, the amount of recharge was 2.0L / d, the particle size of landfill was 5mm, pH (8.5) was adjusted and compacted. The rate of recharge is 0.2 L / min. Among the different recharge parameters, the amount of recharge and the recharge medium pH had the most significant effect on the heavy metal content in the recirculation water of concentrated liquid, and maintained a relatively low recharge rate (2.0L/d), and high pH (8.5) was beneficial to the removal of heavy metals in the recirculation water. The comparative study on the different forms of heavy metals in landfill before and after recharge showed that the mobility of Cu,Zn,Ni,Cr decreased with the increase of landfill age, that is, with the increase of stabilization process, the migration rate of heavy metals decreased gradually. At the same time, the content of acid soluble heavy metals has a great influence on its mobility, and the heavy metal mobility is consistent with the order of acid soluble heavy metals. The order in which the mobility of four typical heavy metals ranges from large to small is: ZnCuNiCr. Taking the 15-year column as an example, the mobility was 1.81% and 1.750.9%, respectively, and the form of 0.68%.Cr was the most stable, and it could be fixed rapidly during the recharge of concentrated liquid. This study can provide the basis for the rational design of the reverse osmosis concentrated leachate recirculation system, and also have reference significance for the prevention and control of heavy metal pollution in the leachate.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703
[Abstract]:In view of economy and maneuverability, leachate membrane concentrate produced from sanitary landfills in China is generally treated by landfill recharge. However, there is little research on the migration and transformation of heavy metals in the recharge landfill, and the reasonable removal of heavy metals is not only important to ensure the safety of the soil and groundwater around the landfill. Moreover, it has obvious influence on the normal operation of landfill leachate treatment facilities. Therefore, with the help of indoor simulation test, the migration behavior of heavy metals in the recharge system of different buried age garbage medium and different recharge conditions was studied by using concentrated liquid recharge method, and the main factors affecting heavy metal migration were determined. The optimal parameters of heavy metal removal in recharge concentrate were studied by orthogonal method, and the migration and transformation of heavy metals were studied. The results showed that the landfill medium with the age of one year could remove the typical heavy metal Cu,Zn,Ni,Cr in the concentrated solution to a certain extent. During the recharge cycle, the average removal rates of the above four heavy metals were 19.58%, 39.30% and 26.12.5 years, respectively, and the landfill medium tended to stabilize, and the biological reaction became weaker, the average removal rate of the above four heavy metals was 19.58%, 39.30% and 26.12.5 years, respectively. With the change of the landfill environment, the heavy metal Cu,Zn in the landfill was dissolved continuously, the Ni was removed from the concentrated solution in the early stage of recharge, the Ni was removed from the landfill at the later stage, and the Cr was effectively removed from the concentrated solution. The removal rates of Cr in concentrated solution were 16.35 for 5 years and 34.58 for Cr in 15 years respectively. The effluent concentration of heavy metals with recharge load of 3.0L/d was significantly lower than that of 4.5L/d and 6.0L / d, and the effluent concentration of heavy metals with recharge rate of 0.2L/min was lower than that of 0.3L/min and 0.4L / min. When other factors were determined, with the decrease of recharge load and recharge rate, the concentration of heavy metals in the effluent water decreased, that is, the concentration of heavy metals in effluent showed a positive correlation with the recharge load and the recharge rate. However, different recharge frequency (1 / d, 3 / d / d, 6 times / d) and recharge methods (full distribution of water, intermediate distribution of water, and distribution of water around) had no effect on the effluent concentration. In the research of optimal recharge parameters, the specific parameters of recharge were determined by orthogonal test, that is, the amount of recharge was 2.0L / d, the particle size of landfill was 5mm, pH (8.5) was adjusted and compacted. The rate of recharge is 0.2 L / min. Among the different recharge parameters, the amount of recharge and the recharge medium pH had the most significant effect on the heavy metal content in the recirculation water of concentrated liquid, and maintained a relatively low recharge rate (2.0L/d), and high pH (8.5) was beneficial to the removal of heavy metals in the recirculation water. The comparative study on the different forms of heavy metals in landfill before and after recharge showed that the mobility of Cu,Zn,Ni,Cr decreased with the increase of landfill age, that is, with the increase of stabilization process, the migration rate of heavy metals decreased gradually. At the same time, the content of acid soluble heavy metals has a great influence on its mobility, and the heavy metal mobility is consistent with the order of acid soluble heavy metals. The order in which the mobility of four typical heavy metals ranges from large to small is: ZnCuNiCr. Taking the 15-year column as an example, the mobility was 1.81% and 1.750.9%, respectively, and the form of 0.68%.Cr was the most stable, and it could be fixed rapidly during the recharge of concentrated liquid. This study can provide the basis for the rational design of the reverse osmosis concentrated leachate recirculation system, and also have reference significance for the prevention and control of heavy metal pollution in the leachate.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 劉保成;呂國慶;高禎;鄭學(xué)娟;安麗;;垃圾滲濾液濃縮液的回灌試驗(yàn)研究[J];中國給水排水;2011年19期
2 黃銘珠;劉小芳;侯h，
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