NDLI: Analysis of the Impacts of Flocculation Modes and Coagulant Dose on Dissolved Air Flotation

Content Provider	IEEE Xplore Digital Library
Author	Yuheng Wang Xiuyan Zhou Shengguang Zhou Qishan Wang
Copyright Year	2010
Abstract	Polyaluminium chloride (PAC) was adopted as coagulant to treat the high algae-laden water containing lots of cells of Microcysits aeruginosa (MA) by jar test of cogulation/flocculation/dissovled air flotation (C/F/DAF) process. The constant flocculation and the tapered flocculation with two steps were used in C/F stage. Two-dimension fractal dimension (D2) and strength factor (SF) were respectively introduced to characterize the floc form and strength. The impacts of flocculation mode and coagulant dose on C/F/DAF were analysed by studying the floc structure, size and strength. The impacts of flocculation mode and coagulant dose on C/F/DAF process were discussed, and the causes of these impacts were analyzed by investigating floc sizes, structures and strengths formed in different conditions. The experimental results showed that at the PAC dose of 5.6~9.8 mg Al2O3/L, the flocs formed under bridging flocculation had larger size and highly branched structure, and they were more easily removed by flotation. Comparing the tapered flocculation with the constant flocculation, the former mode could obtain the satisfactory effect of flotation separation at a less dose, because the floc strength formed by this flocculation mode was greater. On the condition of the same energy consumption, the tapered flocculation is more advantageous than the constant flocculation in cost reduction for saving coagulant dose.
Starting Page	1
Ending Page	4
File Size	260260
Page Count	4
File Format	PDF
ISBN	9781424447121
ISSN	21517622
DOI	10.1109/ICBBE.2010.5516161
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-18
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Energy consumption Costs Algae Coagulation Educational institutions Fractals Inductors Testing Aluminum oxide Power engineering and energy
Content Type	Text
Resource Type	Article

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