- 滲濾液浸泡對(duì)堿渣固化污泥長(zhǎng)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(bào) 2023年45卷第3期 頁(yè)碼：164-172
- DOI：10.11835/j.issn.2096-6717.2021.134 中圖分類(lèi)號(hào)：X703.1
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紙質(zhì)出版日期：2023-06-25，
收稿日期：2021-03-06
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摘要
以堿渣—礦渣—生石灰固化污泥用作填埋場(chǎng)臨時(shí)覆蓋材料為背景，開(kāi)展不同滲濾液濃度、浸泡時(shí)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(duì)固化污泥長(zhǎng)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(zhǎng)期浸泡時(shí)，生成鈣釩石和水化硅酸鈣等物質(zhì)，試樣強(qiáng)度隨浸泡時(shí)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(shí)，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(chǎng)臨時(shí)覆蓋材料強(qiáng)度要求，堿渣摻量過(guò)多對(duì)固化污泥的長(zhǎng)期強(qiáng)度不利。滲濾液對(duì)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(shí)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(zhǎng)期浸泡過(guò)程中，堿渣—礦渣—生石灰對(duì)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.
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