[1]朱企,李大鹏,刘松琪.粉煤灰协同水泥、CaO2固化底泥及控制内源污染效果[J].中国给水排水,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.
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粉煤灰协同水泥、CaO2固化底泥及控制内源污染效果

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第40卷 期数: 2024年第7期 页码: 105-112 栏目: 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， 李大鹏， 刘松琪
（苏州科技大学 环境科学与工程学院，江苏 苏州 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）
关键词:
底泥固化技术;  粉煤灰;  水泥;  CaO2;  内源污染;  氮磷释放
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为研究对象，首先掺入不同比例的单独固化剂（水泥）和复合固化剂（水泥+CaO2）对其进行固定，检测固化底泥的无侧限抗压强度、静置和降雨冲刷条件下底泥氮磷的释放特征。在此基础上分别挑选两组中固化效果较优的掺量（50%水泥以及50%水泥+10%CaO2），进一步加入不同量的粉煤灰，探究在粉煤灰协同下水泥和CaO2固化底泥的效果。结果表明，单独水泥固化和水泥+CaO2固化均使底泥成块且具有较强的抗压能力，并且明显降低了底泥中溶解态无机磷（DIP）向上覆水的释放，在静置和降雨冲刷条件下均有较好的固化效果。此外，水泥和CaO2改变了底泥中磷的形态，但水泥并未促进非磷灰石无机磷（NAIP）向磷灰石无机磷（AP）的转化，而加入CaO2后促进了NAIP向AP的转化。加入粉煤灰后进一步提高了水泥和CaO2的固化效果，其中固化剂最优配比为水泥∶CaO2∶粉煤灰=5∶1∶2，与对照组相比，在实验后期（13~20 d）底泥固化后，上覆水中氨氮去除率为86.33%，DIP去除率为90.5%。水泥、CaO2和粉煤灰的协同固化处理能够有效抑制底泥内源氮磷的释放，减少底泥对环境的二次污染。
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