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[1]朱企,李大鵬,劉松琪.粉煤灰協(xié)同水泥、CaO2固化底泥及控制內(nèi)源污染效果[J].中國給水排水,2024,40(7):105-112.
ZHUQi,LIDa-peng,LIUSong-qi.Fly Ash in Coordination with Cement and CaO2 to Solidify Sediment and Its Performance for Controlling Endogenous Pollution[J].China Water & Wastewater,2024,40(7):105-112.點擊復(fù)制
粉煤灰協(xié)同水泥、CaO2固化底泥及控制內(nèi)源污染效果
中國給水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第40卷 期數(shù): 2024年第7期 頁碼: 105-112 欄目: 出版日期: 2024-04-01
Title:Fly Ash in Coordination with Cement and CaO2 to Solidify Sediment and Its Performance for Controlling Endogenous Pollution
作者:朱企， 李大鵬， 劉松琪（蘇州科技大學(xué) 環(huán)境科學(xué)與工程學(xué)院，江蘇 蘇州 215009）
Author(s):ZHU Qi， LI Da-peng， LIU Song-qi（School of Environmental Science and Engineering， Suzhou University of Science and Technology， Suzhou 215009， China）
關(guān)鍵詞:底泥固化技術(shù); 粉煤灰; 水泥; CaO2; 內(nèi)源污染; 氮磷釋放
Keywords:sediment curing technology; fly ash; cement; calcium peroxide; endogenous pollution; nitrogen and phosphorus release
摘要:以城市受污染河道的底泥為研究對象，首先摻入不同比例的單獨固化劑（水泥）和復(fù)合固化劑（水泥+CaO2）對其進(jìn)行固定，檢測固化底泥的無側(cè)限抗壓強(qiáng)度、靜置和降雨沖刷條件下底泥氮磷的釋放特征。在此基礎(chǔ)上分別挑選兩組中固化效果較優(yōu)的摻量（50%水泥以及50%水泥+10%CaO2），進(jìn)一步加入不同量的粉煤灰，探究在粉煤灰協(xié)同下水泥和CaO2固化底泥的效果。結(jié)果表明，單獨水泥固化和水泥+CaO2固化均使底泥成塊且具有較強(qiáng)的抗壓能力，并且明顯降低了底泥中溶解態(tài)無機(jī)磷（DIP）向上覆水的釋放，在靜置和降雨沖刷條件下均有較好的固化效果。此外，水泥和CaO2改變了底泥中磷的形態(tài)，但水泥并未促進(jìn)非磷灰石無機(jī)磷（NAIP）向磷灰石無機(jī)磷（AP）的轉(zhuǎn)化，而加入CaO2后促進(jìn)了NAIP向AP的轉(zhuǎn)化。加入粉煤灰后進(jìn)一步提高了水泥和CaO2的固化效果，其中固化劑最優(yōu)配比為水泥∶CaO2∶粉煤灰=5∶1∶2，與對照組相比，在實驗后期（13~20 d）底泥固化后，上覆水中氨氮去除率為86.33%，DIP去除率為90.5%。水泥、CaO2和粉煤灰的協(xié)同固化處理能夠有效抑制底泥內(nèi)源氮磷的釋放，減少底泥對環(huán)境的二次污染。
Abstract:This paper solidified the sediment from urban polluted river by mixing different proportions of single curing agent (cement) and compound curing agent (cement and CaO2), and then detected the unconfined compression strength of the solidified sediment and the release of nitrogen and phosphorus from the sediment under static and rainfall erosion conditions. On this basis, the dosages of the two groups with better curing performances (50% cement and 50% cement with 10% CaO2) were selected respectively, and different dosages of fly ash were further added to explore the performance of cement and CaO2 in coordination with fly ash for sediment solidification. Both the cement curing alone and cement and CaO2 curing solidified the sediment into blocks and showed strong compression resistance, significantly reduced the release of dissolved inorganic phosphorus (DIP) from the sediment to the overlying water, and demonstrated a good curing performance under static and rainfall erosion conditions. In addition, cement and CaO2 changed the form of phosphorus in the sediment. However, cement did not promote the conversion of non-apatite inorganic phosphorus (NAIP) to apatite phosphorus (AP), while CaO2 promoted the conversion of NAIP to AP. The addition of fly ash further improved the curing performance of cement and CaO2, in which the optimal proportion of curing agent was cement, CaO2 and fly ash of 5∶1∶2. Compared with the control group, the removal rates of ammonia nitrogen and DIP in overlying water after the solidification of the sediment were 86.33% and 90.5% in the later period of the experiment (13-20 days). The collaborative curing of cement, CaO2 and fly ash effectively inhibited the release of endogenous nitrogen and phosphorus from the sediment and reduced the secondary pollution of the sediment to the environment.
更新日期/Last Update: 2024-04-01
[1]朱企,李大鵬,劉松琪.粉煤灰協(xié)同水泥、CaO2固化底泥及控制內(nèi)源污染效果[J].中國給水排水,2024,40(7):105-112.
ZHUQi,LIDa-peng,LIUSong-qi.Fly Ash in Coordination with Cement and CaO2 to Solidify Sediment and Its Performance for Controlling Endogenous Pollution[J].China Water & Wastewater,2024,40(7):105-112.
點擊復(fù)制
ZHUQi,LIDa-peng,LIUSong-qi.Fly Ash in Coordination with Cement and CaO2 to Solidify Sediment and Its Performance for Controlling Endogenous Pollution[J].China Water & Wastewater,2024,40(7):105-112.
粉煤灰協(xié)同水泥、CaO2固化底泥及控制內(nèi)源污染效果
中國給水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第40卷 期數(shù): 2024年第7期 頁碼: 105-112 欄目: 出版日期: 2024-04-01
- Title:
- Fly Ash in Coordination with Cement and CaO2 to Solidify Sediment and Its Performance for Controlling Endogenous Pollution
- Keywords:
- sediment curing technology; fly ash; cement; calcium peroxide; endogenous pollution; nitrogen and phosphorus release
- 摘要:
以城市受污染河道的底泥為研究對象，首先摻入不同比例的單獨固化劑（水泥）和復(fù)合固化劑（水泥+CaO2）對其進(jìn)行固定，檢測固化底泥的無側(cè)限抗壓強(qiáng)度、靜置和降雨沖刷條件下底泥氮磷的釋放特征。在此基礎(chǔ)上分別挑選兩組中固化效果較優(yōu)的摻量（50%水泥以及50%水泥+10%CaO2），進(jìn)一步加入不同量的粉煤灰，探究在粉煤灰協(xié)同下水泥和CaO2固化底泥的效果。結(jié)果表明，單獨水泥固化和水泥+CaO2固化均使底泥成塊且具有較強(qiáng)的抗壓能力，并且明顯降低了底泥中溶解態(tài)無機(jī)磷（DIP）向上覆水的釋放，在靜置和降雨沖刷條件下均有較好的固化效果。此外，水泥和CaO2改變了底泥中磷的形態(tài)，但水泥并未促進(jìn)非磷灰石無機(jī)磷（NAIP）向磷灰石無機(jī)磷（AP）的轉(zhuǎn)化，而加入CaO2后促進(jìn)了NAIP向AP的轉(zhuǎn)化。加入粉煤灰后進(jìn)一步提高了水泥和CaO2的固化效果，其中固化劑最優(yōu)配比為水泥∶CaO2∶粉煤灰=5∶1∶2，與對照組相比，在實驗后期（13~20 d）底泥固化后，上覆水中氨氮去除率為86.33%，DIP去除率為90.5%。水泥、CaO2和粉煤灰的協(xié)同固化處理能夠有效抑制底泥內(nèi)源氮磷的釋放，減少底泥對環(huán)境的二次污染。
Abstract:
This paper solidified the sediment from urban polluted river by mixing different proportions of single curing agent (cement) and compound curing agent (cement and CaO2), and then detected the unconfined compression strength of the solidified sediment and the release of nitrogen and phosphorus from the sediment under static and rainfall erosion conditions. On this basis, the dosages of the two groups with better curing performances (50% cement and 50% cement with 10% CaO2) were selected respectively, and different dosages of fly ash were further added to explore the performance of cement and CaO2 in coordination with fly ash for sediment solidification. Both the cement curing alone and cement and CaO2 curing solidified the sediment into blocks and showed strong compression resistance, significantly reduced the release of dissolved inorganic phosphorus (DIP) from the sediment to the overlying water, and demonstrated a good curing performance under static and rainfall erosion conditions. In addition, cement and CaO2 changed the form of phosphorus in the sediment. However, cement did not promote the conversion of non-apatite inorganic phosphorus (NAIP) to apatite phosphorus (AP), while CaO2 promoted the conversion of NAIP to AP. The addition of fly ash further improved the curing performance of cement and CaO2, in which the optimal proportion of curing agent was cement, CaO2 and fly ash of 5∶1∶2. Compared with the control group, the removal rates of ammonia nitrogen and DIP in overlying water after the solidification of the sediment were 86.33% and 90.5% in the later period of the experiment (13-20 days). The collaborative curing of cement, CaO2 and fly ash effectively inhibited the release of endogenous nitrogen and phosphorus from the sediment and reduced the secondary pollution of the sediment to the environment.
更新日期/Last Update: 2024-04-01
