摘要
采用O_3/H_2O_2/Fe^(2+)均相催化臭氧氧化体系对煤气化废水进行深度处理,并对比了O_3和O_3/H_2O_2氧化体系的氧化效率。考察了连续O_3曝气试验条件下各影响因子对煤气化废水处理效果的影响。结果表明:在各自氧化体系最优条件下,O_3/H_2O_2/Fe^(2+)体系对煤气化废水的氧化效果最佳,其次为O_3/H_2O_2和O_3体系;在反应时间为40min,pH=6.01,O_3、H_2O_2和FeSO4·7H_2O投加量分别为126.2mg/L、57 mg/L和58.26 mg/L条件下,O_3/H_2O_2/Fe^(2+)均相催化臭氧氧化处理煤气化废水后,出水CODCr由126.2 mg/L降到29.1 mg/L,去除率为76.94%,色度、浊度的去除率分别为99.33%、70.64%;废水的BOD5/CODCr由初始0.04提高到0.35,废水的可生化性显著提高。研究表明,O_3/H_2O_2/Fe^(2+)均相催化臭氧氧化体系可以高效地对煤气化废水进行深度处理。
The purpose of this paper is to investigate the effects of the combined 03/H2O2/Pe2＋ process on treating the coal gasifi- cation wastewater. In this paper, the adopted coal gasification wastewater sample had been treated biologically in advance. The reactions proceeded at the normal pressure and temperature. CODcr, chromaticity and the turbidity can all be used to serve as the main indictors to test the treating results. What we have done in our research in this paper can be illustrated below. At the beginning of our experiment, we have made testing and comparison between the treatment effects of the single O3 oxidation and O3/ HE O2 processes with each other. And, then, it would be necessary to check and verify the likely suitable pH values to be used for each process based on the reaction mechanism. The results of the experiments prove that, under the optimal conditions of reaction time being 40 min, pH = 6. 01, the effects of O3/H2O2/Fe2＋ process on chromaticity, turbidity and CODcr removal efficiencies are to be expected better than done in the process of O3/H2O2 and O3, with the dosage of O3, H2O2 and FeSO4 · 7H2O being 126. 2 mg/L, 57 mg/L and 58.26 mg/L, respectively. What is more, CODcr has been found being decreased from 126. 2 mg/L to 29. 1 mg/L with the removal efficiency at a rate of 76. 94%. At the same time, in the same process, the corresponding removal efficiencies of ammonia nitrogen, chromaticity and turbidity may account for 64. 78% , 99. 33% and 70. 64% , respectively. Needless to say, we have also found that the initial pH value may have largely affected chromaticity removal efficiency of O3/H2O2 and O3/H2O2/Fe2＋ process, which may also account for the utili- zation efficiency of ·OH. On the other hand, the ratio of BOD5/CODcr has increased from 0. 04 to 0. 35, which shows that the biodegradability has been remarkably improved by O3/H2O2 Fe2＋ process. From what is said above, we can conclude that it would be possible for us to enhance O3 oxidation process further by combining H2O2 and Fe2＋ agents, whose performance proves better than in the other processes. Thus, the main indicators of the effluent can reach the first class A according to the Integrated Sewage Discharge Standard （GB 8978-1996）.
作者
乔瑞平
魏祥甲
王兰
俞彬
乔丽丽
施博颖
QIAO Rui-ping WEI Xiang-jia WANG Lan YU Bin QIAO Li-Li SHI Bo-ying(Poten Environment Research ＆ Development Center, Beijing 101500, China Poten （Beijing） Environment Design ＆ Research Institute Co. , Ltd. , Beijing 100081, China Poten Environment Group Co. , Ltd. , Beijing 100082, China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2016年第6期219-223,共5页
Journal of Safety and Environment
基金
博天环境集团股份有限公司创新领域前沿项目(Y-01-14-04)
关键词
环境工程学
煤气化废水
臭氧氧化
深度处理
environmental engineering
coal gasification wastewater
ozonation
advanced treatment
