文献类型：期刊文献

中文题名：释氧复合剂的制备及其性能研究

英文题名：A method for preparing the oxygen release compound and its study

作者：杨洁[1];林逢凯[1];杨磊[2];华丹芸[1]

机构：[1]华东理工大学资源与环境工程学院,上海200237;[2]华东理工大学化学与分子工程学院,上海200237

年份：2014

卷号：14

期号：2

起止页码：117

中文期刊名：安全与环境学报

外文期刊名：Journal of Safety and Environment

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

语种：中文

中文关键词：环境工程学;沉积物氧消耗(SOD);释氧复合剂;过氧化钙

外文关键词：environmental engineering; sediment oxygen demand（SOD）; oxygen release compound; calcium peroxide

摘要：以过氧化钙(CaO2)为氧源、活性炭颗粒(GAC)为填充材料、聚乙烯醇(PVA)为包埋载体,制备了一种新型释氧复合剂(简称复合剂)用于沉积物修复。通过复合剂释氧试验,分析了PVA质量分数、CaO2和GAC比例、GAC粒径及固化温度对复合剂释氧过程的影响,并对复合剂在沉积物存在条件下的释氧效果进行了研究。结果表明:复合剂能够满足沉积物氧消耗(SOD)需求,PVA包埋及GAC的添加能有效控制CaO2与水的反应速率,延长释氧时间。含混合粒径GAC的复合剂释氧过程相对稳定,释氧时间为粉末态CaO2的6倍,固化温度为60℃时能使PVA获得更好的包埋效果。在沉积物模拟复氧试验中,当复合剂投加量为200 g/m2时,30 d内上覆水溶氧维持在1.3 mg/L以上,氧化还原电位(ORP)由-116mV上升至144 mV。这表明复合剂能显著改善沉积物表面溶氧状态,提高沉积物-水界面氧化还原电位,有利于水体自净。
The paper intends to introduce our innovated method for preparing oxygen release compound along with a study of its behaviors in the actual application. To be exact, the novel oxygen release compound （ORC） that we have prepared can be done by taking calcium peroxide as oxygen source, with the active carbon particles taken as filler and polyvinyl alcohol as embedding carrier. To prepare such a kind of compound, we have carefully made an exploration of the effects of the CaO 2 /GAC ratio and PVA mass fraction on the oxygen release efficiency of ORC so as to build up the preliminary formula of the compound for sediment bio-remediation. It is also on this basis that we have analyzed the effects of the form of calcium peroxide, the particle size of the active carbon and treating time of the oxygen release compound on the oxygen releasing process. In addition, we have also applied a nonlinear regression forecasting model to the study of the release rate of oxygen from ORC in hoping to determine the kinetic coefficient based on the observed DO data. Thus, we have arrived at a well resulted matching situation through comparison between the regression estimation and the observed data of the DO concentration change over the time. The experimental and testing results we have gained show that the oxygen produced by ORC could meet the sediment oxygen demand （SOD）. And, then, we have found that the reaction rate of calcium peroxide with water can be controlled by the PVA embedding and adding the active carbon with the release time being extended. Moreover, we have found that the oxygen release rate of ORC can be controlled by the mixed-size of active granular carbon. Since the said oxygen-releasing process with the mixed particle granular active carbon tends to be more stable, it is also possible to extend the effective oxygen release period even by 6 times longer than the calcium peroxide powder. What is more, since the treating temperature has significant impact on the embedding, increase of the treating temperature would in turn increase the oxygen release rate, which has made us find that it would be possible to obtain a better embedding effect at the temperature of 60 ℃. Furthermore, we have investigated the oxygen release efficiency of ORC at presence of sediment, finding that the oxygen release compound helps to improve the condition of the dissolved oxygen at the sediment-water interface significantly. For instance, when the dosage was 200 g ORC/m 2 sediment, it was possible to raise the dissolved oxygen in the overlying water above 1.3 mg/L, and the oxidation-reduction potential at the sediment-water interface from -116 mV to 144 mV during a remediation period of 30 d. It implies that ORC contributes greatly to a much better oxygen release efficiency for the sediment remediation.