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Improvement on algae and turbidity removal in an integrated flotation and sedimentation unit using side flow-inclined plate settlers: evidence from a full-scale field experiment
- Source :
- Journal of Water Supply: Research and Technology - Aqua. 67:84-98
- Publication Year :
- 2017
- Publisher :
- IWA Publishing, 2017.
-
Abstract
- Operation of conventional drinking water treatment plants (DWTPs) is limited by seasonal variations in the characteristics of raw water, such as algae levels and turbidity. In this study, an integrated flotation and sedimentation unit (IFSU) with side flow-inclined plate settlers (SFIPS) was applied to enhance the removal ratio of algae and turbidity in a full-scale field experiment. To accomplish this, the performance of two IFSU reactors (with and without SFIPS) treating algal-rich water, low-turbidity water and high-turbidity water was compared. Extensive experiments were conducted based on a central composite face-centered design, and the results were analyzed using response surface methodology. Polyaluminium chloride dose, NaOH dose, influent turbidity level and influent chlorophyll level were selected as the operating variables to analyze, optimize and model the process. The results showed that SFIPS functioned as a counterflow inducer to enhance the effects of stratified flow patterns and decrease the clarification loading rate in the separation zone during the dissolved air flotation process, leading to considerable increases in algae and turbidity removal in the IFSU reactor. The results of this study will facilitate upgrades of conventional DWTPs to improve their potential.
- Subjects :
- Environmental Engineering
biology
Sedimentation (water treatment)
Health, Toxicology and Mutagenesis
Dissolved air flotation
Field experiment
0208 environmental biotechnology
Environmental engineering
02 engineering and technology
010501 environmental sciences
biology.organism_classification
01 natural sciences
020801 environmental engineering
Algae
Environmental science
Water treatment
Response surface methodology
Turbidity
Raw water
0105 earth and related environmental sciences
Water Science and Technology
Subjects
Details
- ISSN :
- 16053974 and 00037214
- Volume :
- 67
- Database :
- OpenAIRE
- Journal :
- Journal of Water Supply: Research and Technology - Aqua
- Accession number :
- edsair.doi...........3b3cb46f51c231967d4ebf0a9553909b