BHC公司（BHC）是Aquarion公司的子公司，是康涅狄格州费尔菲尔德、纽黑文和利奇菲尔德县24个城镇超过50万用户的公共供水公司。BHC运营着六座地表水处理厂，包括三座溶解气浮（DAF）厂和两座薄层沉淀厂。到目前为止，康涅狄格州仅为其DAF工厂提供了2个原木贾第鞭毛虫清除学分。由于这一点，以及为IESWTR收集隐孢子虫去除数据的需要，本文描述的研究检查了用于DAF处理的贾第虫和隐孢子虫去除数据，并与板层沉积进行了比较。 本文的目的是:比较片状沉淀和DAF的性能；检查薄层沉淀或DAF加双介质过滤澄清的整体性能；并研究水温对性能的季节性影响。包括10个参考文献、表格和图表。

BHC Company (BHC), a subsidiary of Aquarion Company is the public water supply company for more than 500,000 customers in 24 cities and towns in Fairfield, New Haven, and Litchfield Counties of Connecticut. BHC operates six surface water treatment plants including three dissolved air flotation (DAF) plants and two lamella sedimentation plants. The State of Connecticut has, to this date, given BHC only 2 log Giardia removal credit for its DAF plants. Because of this and also the need to collect Cryptosporidium removal data for the IESWTR, the research described in this paper examines Giardia and Cryptosporidium removal data for DAF treatment compared to lamella sedimentation. The objectives of the paper are: to compare performance of lamella sedimentation to DAF; to examine overall performance of clarification by lamella sedimentation or DAF plus dual media filtration; and, to examine seasonal effects of water temperature on performance. Includes 10 references, tables, figures.