- 滲濾液浸泡對堿渣固化污泥長期性能的影響
- Influence of leachate soaking on long-term properties of sludge solidified with soda residue
- 何俊， 周莉蓉， 張磊， 馮瀟瑩
- 土木與環(huán)境工程學(xué)報 2023年45卷第3期 頁碼：164-172
- DOI：10.11835/j.issn.2096-6717.2021.134 中圖分類號：X703.1
-
紙質(zhì)出版日期：2023-06-25，
收稿日期：2021-03-06
-
引用本文
閱讀全文PDF
掃 描 看 全 文
摘要
以堿渣—礦渣—生石灰固化污泥用作填埋場臨時覆蓋材料為背景，開展不同滲濾液濃度、浸泡時間和堿渣摻量條件下固化污泥性質(zhì)的研究，探討滲濾液浸泡對固化污泥長期性能的影響規(guī)律及微觀機(jī)理。結(jié)果表明：固化污泥在滲濾液中長期浸泡時，生成鈣釩石和水化硅酸鈣等物質(zhì)，試樣強(qiáng)度隨浸泡時間的增加而增大，固化污泥有較好的耐久性；但當(dāng)堿渣摻量60%的試樣浸泡210 d時，試樣中生成大量的碳酸鈣和不同尺寸的鈣釩石，結(jié)構(gòu)變得疏松，試樣出現(xiàn)裂隙，強(qiáng)度大幅降低，低于垃圾填埋場臨時覆蓋材料強(qiáng)度要求，堿渣摻量過多對固化污泥的長期強(qiáng)度不利。滲濾液對固化污泥有一定的侵蝕性，固化污泥強(qiáng)度隨滲濾液濃度的增大而降低。固化污泥具有結(jié)構(gòu)性，不同滲濾液濃度和浸泡時間下固化污泥結(jié)構(gòu)屈服應(yīng)力變化與強(qiáng)度變化規(guī)律基本一致。在滲濾液長期浸泡過程中，堿渣—礦渣—生石灰對污泥和滲濾液中的鉻、銅、鉛、砷等污染物可起到穩(wěn)定作用。
Abstract
Sewage sludge was solidified with soda residue (SR), ground granulated blast furnace slag (GGBS), and quicklime, which was used as a temporary covering material for landfills. The effect of leachate concentration, soaking time and SR content on the long-term properties of solidified sludge was carried out. The micro mechanism of long-term performance was investigated. The results indicate that hydration products such as ettringite and calcium silicate hydrate are generated when the solidified sludge is soaked in the leachate. The strength of the sample increases with the increase in soaking time, indicating that the solidified sludge has good durability to the leachate. Nevertheless, a large amount of calcium carbonate and ettringite of different sizes are generated in the sample with 60% SR content after being soaked for 210 d. Then the structure becomes loose, cracks appear in the sample, the strength decreases significanty, and its long-term strength reduces to lower than the strength requirement for temporary cover. Too much SR content is not good for the long-term strength of solidified sludge. The strength of solidified sludge decreases as the leachate concentration increases due to the corrosive effects of leachate. The solidified sludge is structural, and the changes in the yield stress under leachate soaking are basically similar to the strength. During the long-term leachate soaking, SR-GGBS-quicklime can stabilize some pollutions such as chromium, copper, lead and arsenic in the sludge and leachate.
參考文獻(xiàn)
中華人民共和國住房和城鄉(xiāng)建設(shè)部. 2019年城市建設(shè)統(tǒng)計年鑒[R/OL]. (2020-12-31) [2021-01-20]. http:// www.mohurd.gov.cn/xytj/tjzljsxytjgb/jstjnj/.[百度學(xué)術(shù)]
Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Statistical Yearbook of Urban Construction in 2019 [R/OL]. (2020-12-31) [2021-01-20]. http:// www.mohurd.gov.cn/xytj/tjzljsxytjgb/jstjnj/.(in Chinese)[百度學(xué)術(shù)]
姜媛媛, 王彥, 段文焱, 等. 市政污泥熱解過程中重金屬遷移特性及環(huán)境效應(yīng)評估[J]. 環(huán)境科學(xué), 2021, 42(6): 2966-2974.[百度學(xué)術(shù)]
JIANG Y Y, WANG Y, DUAN W Y, et al. Migration and environmental effects of heavy metals in the pyrolysis of municipal sludge [J]. Environmental Science, 2021, 42(6): 2966-2974. (in Chinese)[百度學(xué)術(shù)]
VIEIRA R F, MORICONI W, PAZIANOTTO R A A. Residual and cumulative effects of soil application of sewage sludge on corn productivity [J]. Environmental Science and Pollution Research, 2014, 21(10): 6472-6481.[百度學(xué)術(shù)]
FAN X H, ZHU W, QIAN Y J, et al. Increasing the hydraulic conductivity of solidified sewage sludge for use as temporary landfill cover [J]. Advances in Civil Engineering, 2019, 2019: 1-10.[百度學(xué)術(shù)]
曹永華, 閆澍旺, 趙樂軍. 固化污泥的工程性質(zhì)及微觀結(jié)構(gòu)特征[J]. 巖土力學(xué), 2006, 27(5): 740-744.[百度學(xué)術(shù)]
CAO Y H, YAN S W, ZHAO L J. Engineering properties and microstructure feature of solidified sludge [J]. Rock and Soil Mechanics, 2006, 27(5): 740-744. (in Chinese)[百度學(xué)術(shù)]
KIM E H, CHO J K, YIM S. Digested sewage sludge solidification by converter slag for landfill cover [J]. Chemosphere, 2005, 59(3): 387-395.[百度學(xué)術(shù)]
HERRMANN I, SVENSSON M, ECKE H, et al. Hydraulic conductivity of fly ash-sewage sludge mixes for use in landfill cover liners [J]. Water Research, 2009, 43(14): 3541-3547.[百度學(xué)術(shù)]
陳萍, 馮彬, 詹良通. 以垃圾焚燒底灰為骨料的脫水污泥固化試驗[J]. 中國環(huán)境科學(xué), 2014, 34(10): 2624-2630.[百度學(xué)術(shù)]
CHEN P, FENG B, ZHAN L T. Solidification of dewatered sewage sludge using bottom ash of MSWI as skeleton material [J]. China Environmental Science, 2014, 34(10): 2624-2630. (in Chinese)[百度學(xué)術(shù)]
ROSLI N A, AZIZ H A, SELAMAT M R, et al. A mixture of sewage sludge and red gypsum as an alternative material for temporary landfill cover [J]. Journal of Environmental Management, 2020, 263: 110420.[百度學(xué)術(shù)]
城鎮(zhèn)污水處理廠污泥處置混合填埋用泥質(zhì): GB/T 23485—2009 [S]. 北京: 中國標(biāo)準(zhǔn)出版社, 2009.[百度學(xué)術(shù)]
Disposal of sludge from municipal wastewater treatment plant-Quality of sludge for co-landfiling: GB/T 23485—2009 [S]. Beijing: Standards Press of China, 2009 (in Chinese)[百度學(xué)術(shù)]
KJELDSEN P, BARLAZ M A, ROOKER A P, et al. Present and long-term composition of MSW landfill leachate: A review [J]. Critical Reviews in Environmental Science and Technology, 2002, 32(4): 297-336.[百度學(xué)術(shù)]
HE J, LI F, LI Y, et al. Modified sewage sludge as temporary landfill cover material [J]. Water Science and Engineering, 2015, 8(3): 257-262.[百度學(xué)術(shù)]
CHEN P, ZHAN L T, WILSON W. Experimental investigation on shear strength and permeability of a deeply dewatered sewage sludge for use in landfill covers [J]. Environmental Earth Sciences, 2014, 71(10): 4593-4602.[百度學(xué)術(shù)]
ZHANG H Y, YANG B, ZHANG G W, et al. Sewage sludge as barrier material for heavy metals in waste landfill [J]. Archives of Environmental Protection, 2016, 42(2): 52-58.[百度學(xué)術(shù)]
XU S C, LU H J, LIU J Z, et al. An experimental study on the microstructure and triaxial shear of structured clay in contact with landfill leachate [J]. Bulletin of Engineering Geology and the Environment, 2019, 78(6): 4611-4622.[百度學(xué)術(shù)]
李磊, 王佩, 薛飛. 生化降解條件下水泥固化污泥的微觀結(jié)構(gòu)研究[J]. 應(yīng)用基礎(chǔ)與工程科學(xué)學(xué)報, 2018, 26(6): 1217-1225.[百度學(xué)術(shù)]
LI L, WANG P, XUE F. Research on microstructure of solidified sludge using cement under biochemical degradation [J]. Journal of Basic Science and Engineering, 2018, 26(6): 1217-1225. (in Chinese)[百度學(xué)術(shù)]
孫家瑛, 顧昕. 新型無熟料堿渣固化土的工程特性[J]. 建筑材料學(xué)報, 2014, 17(6): 1031-1035.[百度學(xué)術(shù)]
SUN J Y, GU X. Engineering properties of the new non-clinker incorporating soda residue solidified soil [J]. Journal of Building Materials, 2014, 17(6): 1031-1035. (in Chinese)[百度學(xué)術(shù)]
HE J, LI Z X, WANG X Q, et al. Durability of soft soil treated with soda residue and ground granulated blast furnace slag in a soaking environment [J]. Journal of Materials in Civil Engineering, 2020, 32(3): 06019018.[百度學(xué)術(shù)]
劉晶晶, 查甫生, 王連斌, 等. 堿渣固化鉛污染土淋濾特性試驗研究[J]. 東南大學(xué)學(xué)報(自然科學(xué)版), 2016, 46(Sup1): 94-98.[百度學(xué)術(shù)]
LIU J J, ZHA F S, WANG L B, et al. Leaching properties of lead contaminated soils treated by soda residue [J]. Journal of Southeast University (Natural Science Edition), 2016, 46(Sup1): 94-98. (in Chinese)[百度學(xué)術(shù)]
栗志翔. 堿渣-礦渣固化市政污泥的工程性質(zhì)試驗研究[D]. 武漢: 湖北工業(yè)大學(xué), 2020.[百度學(xué)術(shù)]
LI Z X. Experimental research on engineering properties of municipal sludge solidified with soda residue and ground granulated blast furnace slag [D]. Wuhan: Hubei University of Technology, 2020. (in Chinese)[百度學(xué)術(shù)]
公路土工試驗規(guī)程： JTG 3430—2020 [S]. 北京： 人民交通出版社, 2020.[百度學(xué)術(shù)]
Test methods of soils for highway engineering: JTG 3430—2020 [S]. Beijing: China Communications Press, 2020. (in Chinese)[百度學(xué)術(shù)]
李磊, 徐菲, 周靈君, 等. 固化污泥壓縮特性研究[J]. 巖土工程學(xué)報, 2015, 37(1): 171-176.[百度學(xué)術(shù)]
LI L, XU F, ZHOU L J, et al. Compression characteristics of solidified sewage sludge [J]. Chinese Journal of Geotechnical Engineering, 2015, 37(1): 171-176. (in Chinese)[百度學(xué)術(shù)]
XU J, LI Y F, REN C, et al. Damage of saline intact loess after dry-wet and its interpretation based on SEM and NMR [J]. Soils and Foundations, 2020, 60(4): 911-928.[百度學(xué)術(shù)]
