The efficacy of a recovered wash water plant in removing cyanobacteria cells and associated organic compounds

The treatment works under investigation uses a recovered wash water plant (RWWP) to remove impurities prior to recycling filter backwash water. Filter backwash water (raw water) is characterized by high quantities of cyanobacteria cells and associated organic compounds; a potential threat when recov...

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Veröffentlicht in:Water science & technology. Water supply 2020-08, Vol.20 (5), p.1776-1786
Hauptverfasser: Mkhonto, S., Ewerts, H., Swanepoel, A., Snow, G. C.
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container_issue 5
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container_title Water science & technology. Water supply
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creator Mkhonto, S.
Ewerts, H.
Swanepoel, A.
Snow, G. C.
description The treatment works under investigation uses a recovered wash water plant (RWWP) to remove impurities prior to recycling filter backwash water. Filter backwash water (raw water) is characterized by high quantities of cyanobacteria cells and associated organic compounds; a potential threat when recovered water is recycled. The aim of this study is to identify the cyanobacteria cells and associated organic compounds in the filter backwash water and to subsequently evaluate the effectiveness of the RWWP in removing these organic impurities during the following periods; autumn-winter and spring-summer. Results showed that at least six major phytoplankton groups were present in the filter backwash water with turbidity levels (59 and 46 NTU; autumn-winter and spring-summer, respectively) being much higher than the drinking water productions standard of ≤5 NTU. Cyanobacteria were a dominant group (mean of 80% and above) in the total phytoplankton composition of the raw water and consisted of three genera (Anabaena sp., Microcystis sp. and Oscillatoria sp.), which were effectively removed by the RWWP (up to 99%). However, associated organic compounds such as geosmin, total organic carbon (TOC), dissolved organic carbon (DOC) and microcystin were not effectively removed during the different seasonal periods but were of such low concentrations that they posed no major risk to the drinking water quality, meeting the RWWP water quality standard.
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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
subjects Anabaena
Autumn
Backwash
Carbon
Cyanobacteria
Dissolved organic carbon
Drinking water
Geosmin
Impurities
Laboratories
Low concentrations
Microcystins
Microcystis
Organic compounds
Phytoplankton
Plant cells
Quality standards
Raw water
Sedimentation & deposition
Spring
Spring (season)
Summer
Total organic carbon
Turbidity
Wash water
Water purification
Water quality
Water quality standards
Water reuse
Water treatment plants
Winter
title The efficacy of a recovered wash water plant in removing cyanobacteria cells and associated organic compounds
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