臭氧—生物活性炭工艺出水pH的变化及机理  

Regularity and mechanism of the pH changing in effluent from ozone-biological activated carbon process

作　　者：王长平[1] 乔铁军[1] 周瑾[1] 张金松[1] 

机构地区：[1]深圳市水务(集团)有限公司,深圳518031

出　　处：《给水排水》2010年第7期21-24,共4页Water & Wastewater Engineering

基　　金：国家高技术研究发展计划(863)项目(2002AA601120)

摘　　要：针对深圳某臭氧—生物活性炭(O3—BAC)深度处理水厂出水pH大幅度下降的现象,通过对O3—BAC工艺前后水样的分析,初步确定了O3—BAC工艺pH下降的变化规律及机理。结果表明,pH下降的原因为:原水的碱度偏低,缓冲能力较弱,在处理过程中,水的酸度增加,造成出水的pH下降。引起水中酸度增加的主要原因为:二氧化碳影响、硝化作用、水中残余有机物和活性炭自身特性等。在主臭氧过程中,二氧化碳、硝化作用、水中残余有机物和活性炭自身性质造成酸度的增加分别占酸度增加量的57%、0、43%、0;在炭滤过程中,分别占13%、15%、67%、5%。To discover the reason for the rapid decrease of pH in effluent from one ozone-biological activated carbon （O3-BAC） water treatment plant in Shenzhen City,the regularity and mechanism of the pH decease of water treatment plant was studied by analyzing the process of O3-BAC.The results showed that the decrease of pH was caused by weak buffering capacity of raw water due to low alkalinity,and increase of the acidity in the process.The main reasons for the increasing of the acidity were the impact of carbon dioxide,nitrification,residual organic matter of water and the character of the activated carbon respectively.In the ozonation process,carbon dioxide,nitrification,organic matter and activated carbon lead to the increase of acidity respectively by 57%,0,43% and 0 respectively,and by 13%,15%,67%,5% in the BAC process.

关 键 词：臭氧—生物活性炭 pH下降 酸度 机理 

分 类 号：TU991.2[建筑科学—市政工程]