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垃圾填埋场PBFC防渗浆材制备及性能研究

作者:润色论文网  来源:www.runselw.com  发布时间:2019/9/9 10:04:39  

摘要:随着城市的发展,人口的增加,越来越多的生活垃圾也随之产生,对人类的生活环境也产生了十分严重的影响,尤其是垃圾填埋场中的垃圾在分解过程中形成的渗滤液,对地下水及填埋场周围土壤易形成二次污染。因此,针对垃圾填埋场中渗滤液有较好的阻滞作用,并且施工简单,运行成本低的垂直防渗墙应运而生。

针对垃圾填埋场垂直防渗墙防渗浆材,国内外学者做了一系列研究,通常以水泥-膨润土材料作为防渗墙体的主要材料来制备防渗浆材。本文以水泥-膨润土材料为主要材料,以粉煤灰替代部分水泥,辅以碳酸钠,聚乙烯醇(PVA)等外掺剂制备一种符合垃圾填埋场建造要求,低渗透性,对垃圾渗滤液具有较好吸附效果的防渗浆材(PBFC防渗浆材)。

本文对防渗浆材的可灌性和防渗性能进行测试得知,随着水泥膨润土及碳酸钠掺量的增加,防渗浆材的可泵期和流动度降低,但碳酸钠掺量的增加有助于降低防渗浆材的渗透系数,随着PVA掺量的增加,防渗浆材的流动度和可泵期增大,且PVA的掺入不利于增强防渗浆材的抗渗性能。随着养护时间的增长,防渗浆材固结体的渗透系数减小。对浆材固结体的抗压强度进行试验,结果表明水泥的掺入有助于防渗浆材固结体的抗压强度增加。膨润土、碳酸钠和PVA掺量控制在一定范围内对浆材固结体的强度是有利的。同时,随着水泥和膨润土用量的增加,会使得固结体的抗剪强度增强,但是过量水泥和膨润土掺入会使得固结体的抗剪强度降低。配制人工渗滤液进行吸附试验得知,制备的PBFC防渗浆材对NH4-N和CODcr的吸附率分别达到83.1 %和99.1 %。对金属离子、SS和CODcr的吸附效果显著,吸附率大于99 %,由此表明,制得的PBFC防渗浆材对渗滤液中的污染成分有较好的吸附性能。

With the development of the city and theincrease of the population, more and more domestic garbage is produced, whichhas a very serious impact on human living environment. Especially the leachateformed in the decomposition process of garbage landfill, which is liable toform secondary pollution to groundwater and soil around the landfill.Therefore, the anti-seepage wall with good blocking effect, and theconstruction is simple, low-cost vertical come into being for the landfill.

For the anti-seepage slurry of vertical anti-seepagewall in landfill, a series of studies have been done by scholars at home andabroad. Cement-bentonite slurry is usually used as the main slurry ofanti-seepage wall. In this paper, a kind of anti-seepage slurry (PBFCanti-seepage slurry) with low permeability and good adsorption effect onlandfill leachate was prepared by using cement-bentonite as main slurry, flyash as substitute for part of cement, sodium carbonate and polyvinyl alcohol(PVA) as additives. The following work has been done around PBFC anti-seepageslurry.

In this paper, the groutability andimpervious performance of anti-seepage slurry are tested. It is found that withthe increase of cement,bentonite and sodium carbonatecontent, the pumpability and fluidity of anti-seepage slurry decrease, but withthe increase of sodium carbonate content helps to reduce the permeabilitycoefficient of anti-seepage slurry. With the increase of PVA content, thefluidity and pumpability of anti-seepage slurry decrease. Enlarge. The additionof PVA is not conducive to enhancing the impermeability. With the increase ofcuring time, the permeability coefficient of anti-seepage slurry consolidationdecreases. The compressive strength of slurry consolidation is tested. Theresults show that the addition of cement is helpful to increase the compressivestrength of anti-seepage slurry. Controlling the content of bentonite, sodiumcarbonate and PVA in a certain range is beneficial to the strength ofanti-seepage slurry. At the same time, with the increase of cement andbentonite content, the shear strength of the consolidated body will beenhanced, but the shear strength of the consolidated body will be reduced ifexcessive cement and bentonite are added. The adsorption experiments ofartificial leachate showed that the adsorption rates of NH4-N and CODcr on theprepared PBFC anti-seepage slurry were 83.1 % and 99.1 % respectively. Theadsorption rate of metal ions, SS and CODcr is more than 99 %, which indicatesthat the PBFC anti-seepage slurry has good adsorption performance for thecontaminated components in leachate.

关键词:PBFC防渗浆材;可灌性;力学性能;渗透性能;吸附性能

PBFC anti-seepage slurry; groutability;mechanical properties; permeability; adsorption propertie

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