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http://dx.doi.org/10.11001/jksww.2020.34.6.411

Automatic control of coagulant dosage on the sedimentation and dissolved air flotation(SeDAF) process for enhanced phosphorus removal in sewage treatment facilities  

Jang, Yeoju (Civil & Environmental Engineering, University of Science and Technology (UST, KICT school))
Jung, Jinhong (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT))
Kim, Weonjae (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT))
Publication Information
Journal of Korean Society of Water and Wastewater / v.34, no.6, 2020 , pp. 411-423 More about this Journal
Abstract
To remove phosphorus from the effluent of public wastewater treatment facilities, hundreds of enhanced phosphorus treatment processes have been introduced nationwide. However, these processes have a few problems including excessive maintenance cost and sludge production caused by inappropriate coagulant injection. Therefore, the optimal decision of coagulant dosage and automatic control of coagulant injection are essential. To overcome the drawbacks of conventional phosphorus removal processes, the integrated sedimentation and dissolved air flotation(SeDAF) process has been developed and a demonstration plant(capacity: 100 ㎥/d) has also been installed. In this study, various jar-tests(sedimentation and / or sedimentation·flotation) and multiple regression analyses have been performed. Particularly, we have highlighted the decision-making algorithms of optimal coagulant dosage to improve the applicability of the SeDAF process. As a result, the sedimentation jar-test could be a simple and reliable method for the decision of appropriate coagulant dosage in field condition of the SeDAF process. And, we have found that the SeDAF process can save 30 - 40% of coagulant dosage compared with conventional sedimentation processes to achieve total phosphorus (T-P) concentration below 0.2 mg/L of treated water, and it can also reduce same portion of sludge production.
Keywords
Sedimentation.dissolved air flotation(SeDAF); Enhanced phosphorus removal; Wastewater treatment; Coagulant dosage; Decision making algorithm;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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