应用于黑臭水体的新型缓释氧材料制备及其释氧效果模拟
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摘要
缓释氧材料应用于黑臭水体原位修复技术具有广阔的应用前景。材料释氧的长期性和有效性是促进黑臭水体修复的关键因素。实验通过在缓释氧材料制备过程中加入膨润土、黄糊精等材料,改进释氧材料的性能。模拟河道实验结果显示:改进后的缓释氧材料释氧速率平稳、释氧时间长,可以使水中DO浓度长期保持在10 mg/L以上。在缓释氧材料中添加一定量的pH缓冲剂对黑臭水体的pH变动有较好的缓冲作用,且对黑臭水体中微生物生存环境影响较小,可将水体pH值维持在适合微生物生存的环境,提高黑臭水体的生态修复效果。通过模拟2种投加方式对材料释氧效果,比较发现,相比平铺投加,采用释氧格栅的投加方式对水体DO浓度提升更为显著。
The oxygen slow-releasing material has a broad application prospect in the in-situ repairing of black and odorous water. The long-term and effectiveness of oxygen release from materials were key factors in promoting the repair of black and odorous water. The experiment improved the performance of the oxygen slow-releasing compound by adding materials such as bentonite and yellow dextrin,during the its preparation. The results of the simulated river experiments showed that the improved slow-release oxygen material had a stable oxygen release rate and a long oxygen release time,which could maintain the DO concentration in the reclaimed water for more than 10 mg/L for a long time. Adding a certain amount of pH buffer to the oxygen slow release compound had good buffering effect on the pH change of the black and odorous water,but had little influence on the microbial living environment; it could maintain the pH of the water in a suitable range for microbial survival.This material could improve the ecological restoration effect of black and odorous water. Through the comparison of oxygen release effect of the material by two dosing methods,we found that barrier addition was more effective than the tiled addition.
The oxygen slow-releasing material has a broad application prospect in the in-situ repairing of black and odorous water. The long-term and effectiveness of oxygen release from materials were key factors in promoting the repair of black and odorous water. The experiment improved the performance of the oxygen slow-releasing compound by adding materials such as bentonite and yellow dextrin,during the its preparation. The results of the simulated river experiments showed that the improved slow-release oxygen material had a stable oxygen release rate and a long oxygen release time,which could maintain the DO concentration in the reclaimed water for more than 10 mg/L for a long time. Adding a certain amount of pH buffer to the oxygen slow release compound had good buffering effect on the pH change of the black and odorous water,but had little influence on the microbial living environment; it could maintain the pH of the water in a suitable range for microbial survival.This material could improve the ecological restoration effect of black and odorous water. Through the comparison of oxygen release effect of the material by two dosing methods,we found that barrier addition was more effective than the tiled addition.
引文
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[2]赵颖,陈珂,张兰真,等.我国黑臭水体治理技术的研究进展[J].资源节约与环保,2017(3):25,30.
[3]廖伟伶,黄健盛,丁健刚,等.我国黑臭水体污染与修复技术研究现状[J].长江科学院院报,2017,34(11):153-158.
[4]张列宇,王浩,李国文,等.城市黑臭水体治理技术及其发展趋势[J].环境保护,2017,45(5):62-65.
[5] Wang H F,Zhao Y S,Li T Y,et al. Properties of calcium peroxide for release of hydrogen peroxide and oxygen:a kinetics study[J]. Chemical Engineering Journal,2016,303:450-457.
[6] Liu C Y,Speitel G E,Georgiou G,et al. Kinetics of methyl tbutyl ether cometabolism at low concentrations by pure cultures of butane-degrading bacteria[J]. Applied and Environmental Microbiology,2001,67(5):2197-2201.
[7] Prince R C. Biodegradation of methyl tertiary-butyl ether(MTBE)and other fuel oxygenates[J]. Critical Reviews in Microbiology,2000,26(3):163-178.
[8]张永祥,梁建奎,王然,等.地下水PRB原位生物修复中一种释氧材料的改进技术及效果分析[J].环境工程学报,2012,6(11):3910-3914.
[9]刘涉江,刘秀丽,王少博. CPC/CaO2氧缓释复合材料的制备及其释氧性能探讨[J].环境工程学报,2010,4(5):971-974.
[10]杨洁.用于水体修复的释氧复合剂的研制及作用机理研究[D].上海:华东理工大学,2015.
[11]李明,朱晓明,阮晓红,等.包裹缓释外壳的缓释氧材料的性能影响分析[J].地下水,2012,34(6):173-175.
[12]谢李,刘菲,刘玉龙.释氧渗透反应格栅填料的改进研究[J].环境科学与技术,2010,33(2):44-48.
[13]孔祥科,张英,毕二平.地下水修复系统中释氧材料的改进及pH调控[J].环境工程学报,2012,6(9):2935-2940.