Alkaline solution neutralization capacity of soil |
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| Authors: | Hiroshi Asakura Hirofumi Sakanakura Toshihiko Matsuto |
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| Affiliation: | 1. Fukken Co., Ltd., 2-10-11 Hikarimachi, Higashi-ku, Hiroshima 732-0052, Japan;2. National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Ibaraki 305-8506, Japan;3. Division of Environmental and Resource Engineering, Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan;1. School of Industrial Engineering, University LIUC-Cattaneo, Corso Matteotti 22, 21053 Castellanza, VA, Italy;2. Department of Civil and Environmental Engineering, University of Roma La Sapienza, Via Eudossiana 18, I-00184 Rome, Italy;1. Center for Energy Resources Engineering, Technical University of Denmark, Søltofts Plads Building 229, 2800 Lyngby, Denmark;2. Korean Institute of Science and Technology Europe, Campus E7.1, Universität des Saarlandes, 66123 Saarbrücken, Germany;3. Department of Environmental Engineering, Technical University of Denmark, Miljøvej Building 113, 2800 Kgs. Lyngby, Denmark;4. Aarhus University, Department of Agroecology, Blichers Allé, Postbox 50, DK 8830 Tjele, Denmark;5. Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark;1. Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan;2. Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan;3. Materials Sciences Research Center, Japan Atomic Energy Agency, 1-1-1 Koto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan |
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| Abstract: | Alkaline eluate from municipal solid waste (MSW) incineration residue deposited in landfill alkalizes waste and soil layers. From the viewpoint of accelerating stability and preventing heavy metal elution, pH of the landfill layer (waste and daily cover soil) should be controlled. On the other hand, pH of leachate from existing MSW landfill sites is usually approximately neutral. One of the reasons is that daily cover soil can neutralize alkaline solution containing Ca2+ as cation. However, in landfill layer where various types of wastes and reactions should be taken into consideration, the ability to neutralize alkaline solutions other than Ca(OH)2 by soil should be evaluated. In this study, the neutralization capacities of various types of soils were measured using Ca(OH)2 and NaOH solutions. Each soil used in this study showed approximately the same capacity to neutralize both alkaline solutions of Ca(OH)2 and NaOH. The cation exchange capacity was less than 30% of the maximum alkali neutralization capacity obtained by the titration test. The mechanism of neutralization by the pH-dependent charge can explain the same neutralization capacities of the soils. Although further investigation on the neutralization capacity of the soils for alkaline substances other than NaOH is required, daily cover soil could serve as a buffer zone for alkaline leachates containing Ca(OH)2 or other alkaline substances. |
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