scholarly journals MIB and geosmin removal during adsorption and biodegradation phases of GAC filtration

2017 ◽  
Vol 18 (4) ◽  
pp. 1449-1455 ◽  
Author(s):  
K. Doederer ◽  
G. A. De Vera ◽  
M. P. Espino ◽  
M.-L. Pype ◽  
D. Gale ◽  
...  
Keyword(s):  
Natural Organic Matter ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Biologically Active ◽  
Adsorption Sites ◽  
Taste And Odor ◽  
Robust Process ◽  
Biologically Active Carbon ◽  
Biological State

Abstract Biologically active carbon (BAC) filtration is a robust process for removal of many contaminants of concern. In this study, the effectiveness of BAC filtration to remove natural organic matter (NOM) and taste and odor (T&O) compounds was investigated by long-term (7 months) bench-scale filtration experiments. Filters contained fresh granular activated carbon (GAC) and a 2-year-old BAC which were fed with ozonated water from a full-scale water treatment plant spiked with 2-methylisoborneol (MIB) and geosmin. The study aims to evaluate T&O removal of GAC transitioning from its adsorptive to biological state, and to determine the effects of changing hydraulic loading during T&O episodes and its effect on dissolved oxygen (DO) consumption. Sequencing of microbial communities in the BAC revealed that 20% of the identified bacteria were of genus Nitrospira. Based on nitrate formation and dissolved organic carbon (DOC) removal of the 2-year-old BAC, the fresh GAC turned biological after approximately 32,000 bed volumes. DOC removal of the GAC decreased from the initial 80% to 17%, however, the removal of MIB and geosmin remained >90% throughout the experiment (i.e., from adsorption to biodegradation). The 2-year-old BAC showed 9% lower MIB removals than the transitioned GAC filter indicating a contribution of remaining adsorption sites on MIB removal. When challenging the filters at different hydraulic loadings, higher T&O removal was achieved at higher empty bed contact times, which correlated well with increased DO consumption.

Rehabilitation of water treatment plants with operational constrains: a study on turbidity removal

2013 ◽  
Vol 3 (4) ◽  
pp. 549-556 ◽  
Author(s):  
Kaveh Sookhak Lari ◽  
Morteza Kargar
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Term Effect ◽  
High Rate ◽  
Water Turbidity ◽  
Turbidity Removal ◽  
Water Treatment Plants ◽  
Long Term Effect

High-rate lamella settlers in clarifiers and triple media filters have been implemented in Isfahan water treatment plant (known as ‘Baba-Sheikh-Ali’) in Iran to upgrade existing clarification/filtration processes during the recent years. The applied technologies are mainly used to reduce finished water turbidity as the primary regional criterion on water quality. However, application of both technologies faced some operational limitations since they began to work. These problems are due to the existing layout of the process units and available materials. The current study focuses on performance of restricted application of the two technologies with respect to turbidity removal. Online measured turbidity data from a two-year field observation (since March 2010) are used. In particular, results show a more promising and long-term effect on turbidity removal due to tripling filter media rather than application of the lamella settlers in clarifiers. The reasons for these observations are discussed.

Removal of natural organic matter at the Gunbower water treatment plant in northern Victoria, Australia

2015 ◽  
Vol 57 (20) ◽  
pp. 9061-9069
Author(s):  
Sanghyun Jeong ◽  
Tien Vinh Nguyen ◽  
Saravanamuthu Vigneswaran ◽  
Jaya Kandasamy ◽  
Dharma Dharmabalan
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Treatment Plant ◽  
Water Treatment Plant

Analysis on the Natural Organic Matter and Disinfection By-Products in Full-scale Advanced Water Treatment Plant and Conventional Water Treatment Plant

2013 ◽  
Vol 51 (31-33) ◽  
pp. 6288-6298 ◽  
Author(s):  
Jei-cheol Jeon ◽  
Chang-Hyun Jo ◽  
Ilhwan Choi ◽  
Soon-Buhm Kwon[a] Ennkyung Jang ◽  
Tae-Mun Hwang
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Full Scale ◽  
By Products

Long-term studies on hybrid ceramic microfiltration for treatment of surface water containing high dissolved organic matter

2013 ◽  
Vol 14 (2) ◽  
pp. 246-254 ◽  
Author(s):  
A. Abeynayaka ◽  
C. Visvanathan ◽  
S. Khandarith ◽  
T. Hashimoto ◽  
H. Katayama ◽  
...  
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Pilot Scale ◽  
Transmembrane Pressure ◽  
Raw Water ◽  
Operational Parameters ◽  
Polyaluminum Chloride ◽  
Filtration Cycle

This long-term pilot-scale study on the performance of ceramic microfiltration (CMF) was conducted at the Bangkhen water treatment plant (BWTP), with the raw water from Chaophraya River, Thailand. Raw water turbidity and dissolved organic carbon (DOC) were varied in the ranges of 20–210 NTU and 3.0–8.5 mg/L respectively. The hybrid pilot-scale CMF (Pilot-CMF) operational parameters were optimized with the aid of jar-tests and laboratory-scale CMF (Lab-CMF) operations. The systems were operated with various polyaluminum chloride dosages and filtration cycle times. Pilot-CMF provided excellent steady turbidity removal compared to the conventional water treatment process. DOC removal percentages of Pilot-CMF and the conventional process at the BWTP were 49% and 30% respectively. With different coagulant dosages, unique patterns in transmembrane pressure (TMP) variations were observed. The daily TMP increment under low turbidity conditions was 0.08 kPa/day. During rainy periods (turbidity over 100 NTU) the TMP increment reached 0.79 kPa/day. However, once the turbidity of raw water reaches normal conditions (30–60 NTU at the BWTP) the Pilot-CMF system recovers the TMP increment due to efficient backwashing.

Sensory Gas Chromatography for Evaluation of Taste and Odor Events in Drinking Water

1992 ◽  
Vol 25 (2) ◽  
pp. 97-104 ◽  
Author(s):  
D. Khiari ◽  
L. Brenner ◽  
G. A. Burlingame ◽  
I. H. Suffet
Keyword(s):  
Gas Chromatography ◽  
Drinking Water ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Sensory Panel ◽  
Delaware River ◽  
Gc Analysis ◽  
Flame Ionization ◽  
Taste And Odor ◽  
The Individual

A sensory gas chromatography (sensory GC) procedure with appropriate quality assurance steps was developed to evaluate ng/l concentrations of odorous chemicals in drinking water. Closed loop stripping analysis was used to concentrate the chemicals in the water samples. Sensory GC analysis was completed by smelling the effluent at the exit port of an on-column injector capillary GC system. An identical and parallel GC flame ionization detector system was used to monitor the sensory gas chromatograms. The sensory GC analysis is important because it can detect some of the individual components of the odor that a sensory panel determines on a water sample. The relationship between sensory panel response and the sensory GC procedure were investigated near threshold odor concentration levels and the data shows that sensory GC does not always correlate with sensory panel evaluations. This can be caused by the concentrations differences of the chemicals in the mixture and synergistic and antagonistic effects. Two taste and odor events reported at the Baxter Water Treatment Plant of the city of Philadelphia on the Delaware river were investigated. The events were first a metallic aftertaste accompanied by a burnt rubber odor and second a cucumber odor in the drinking water. The cases studied illustrate the use of FPA, sensory GC and GC/MS to understand the chemical nature of the odors present in the samples.

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