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If You Can't Reach the Proposed MCLs for THMs and HAAs Through Enhanced Coagulation, is Ozone a Viable Solution 如果不能通过强化混凝达到THMs和HAAs的MCL 臭氧是可行的解决方案吗
发布日期: 1999-01-01
休斯顿市在1997年秋天完成了一个永久性试点研究设施的建设,以调查新技术和新兴技术,并优化当前的处理工艺。作为一项正在进行的研究的一部分,休斯顿市的研究小组已经并将继续评估臭氧消毒作为减少休斯顿市饮用水中DBP形成的一种手段的有效性。虽然休斯顿市有两个原水来源(三一河和圣哈辛托河),但臭氧研究的这一阶段主要关注三一河的水。使用Trinity河水进行的初步台架和中试研究结果表明,TTHM和THAA浓度大幅降低,并且当臭氧用作预处理剂时,溴酸盐的形成不是问题- 、中间或后消毒剂。DBP浓度的降低远低于THAAs和TTHMs的拟定MCL。当臭氧氧化和强化混凝同时实施时,总有机碳浓度比单独使用强化混凝的降低幅度更大。当在添加混凝剂之前进行臭氧氧化时,臭氧氧化工艺改善了整个成品水的质量、真实颜色、阈值气味数,并且提高了混凝效率(减少了混凝剂剂量)。包括5个参考文献、表格和附录。
The City of Houston completed the construction of a permanent pilot research facility in the fall of 1997 to investigate new and emerging technologies, as well as optimizing current treatment processes. As part of an ongoing study, the City of Houston's research group has, and will continue, to evaluate the effectiveness of ozone disinfection as a means of reducing the formation of DBPs in the City of Houston's drinking water. Although the City of Houston has two raw water sources (Trinity River and San Jacinto River), this phase of the ozone study focused primarily on Trinity River water. Preliminary bench and pilot studies results using Trinity River water show substantial reduction in TTHM and THAA concentrations, and that bromate formation was not a problem when ozone was used as a pre-, intermediate, or post disinfectant. The reductions in DBP concentrations were well below the proposed MCLs for THAAs and TTHMs. When ozonation and enhanced coagulation were implemented together, a greater reduction in total organic carbon concentration was achieved than was achieved using enhanced coagulation alone. The ozonation process improved the overall finished water quality, true color, Threshold Odor Number, and the coagulation efficiency was improved (reduced coagulant dosages) when ozonation was implemented prior to the coagulant addition. Includes 5 references, tables, appendix.
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发布单位或类别: 美国-美国给水工程协会
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