Pilot-Scale Studies of Arsenic Removal with Granular Activated Carbon and Zero-Valent Iron

2012 ◽  
Vol 29 (9) ◽  
pp. 897-901 ◽  
Author(s):  
Weifang Chen ◽  
Robert Parette ◽  
Fred S. Cannon
Keyword(s):  
Activated Carbon ◽  
Arsenic Removal ◽  
Granular Activated Carbon ◽  
Pilot Scale ◽  
Zero Valent Iron

scholarly journals Iron-impregnated granular activated carbon for arsenic removal: Application to practical column filters

2019 ◽  
Vol 239 ◽  
pp. 235-243 ◽  
Author(s):  
Mahatheva Kalaruban ◽  
Paripurnanda Loganathan ◽  
Tien Vinh Nguyen ◽  
Tanjina Nur ◽  
Md Abu Hasan Johir ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Arsenic Removal ◽  
Granular Activated Carbon

scholarly journals Assessing biofilm on biofilter media (granular activated carbon and anthracite) from a pilot scale drinking water treatment plant

2021 ◽  
Author(s):  
Nick Dimas
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
Water Treatment ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Granular Activated Carbon ◽  
Water Treatment Plant ◽  
Pilot Scale ◽  
Microbial Biofilms ◽  
Attachment Sites

Drinking Water Treatment Plants employ biofiltration systems to increase water quality through nutrient reduction. Microbial biofilms housed in biofilter media, are responsible for nutrient uptake and biodegradation. The purpose of this study was to re-evaluate the function and efficiency of biofilter media and investigate seasonal changes in the microbial populations. TOC and DO were more reduced in Granular Activated Carbon (GAC) media than in anthracite. Heterotrophic plate counts (HPC) were conducted to establish seasonal trends on microbial population. PCR-amplified 16S rRNA fragments were sequenced to compare microbial communities. Summer samples have higher HPC than winter samples. Summer samples yielded a reduction in microbial diversity and no detectable overlap with winter samples. Confocal microscopy conducted to qualitatively visualize the structure of biofilms was complemented by quantitative COMSTAT analysis showing GAC with double the biomass due to a greater level of attachment sites. GAC outcompetes anthracite in chemical adsorption and biological activity.

scholarly journals Desorption of Organic Micropollutants from Loaded Granular Activated Carbon

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2754
Author(s):  
Daniela Reif ◽  
Ernis Saracevic ◽  
Monika Šabić Runjavec ◽  
Julia Haslinger ◽  
Heidemarie Schaar ◽  
...  
Keyword(s):  
Particle Size ◽  
Activated Carbon ◽  
Contact Time ◽  
Granular Activated Carbon ◽  
Pilot Scale ◽  
Feed Water ◽  
Drying Methods ◽  
Solvent Ratio ◽  
Organic Micropollutants ◽  
The Impact

The loading of granular activated carbon (GAC) is influenced by the amount of water treated and the concentrations of adsorbates present in the water matrix. Through extraction experiments, we aimed to investigate the total adsorbed mass of eight organic micropollutants by using ethanol as solvent and the maximum possible concentrations, due to the desorption of organic micropollutants, in water. Three different drying methods and the impact of the contact time, GAC particle size, and GAC/solvent ratio were investigated. Although no significant differences between the drying methods could be observed, the chosen contact time and particle size had a significant impact on the amount of organic micropollutants extracted. Lower GAC/solvent ratios positively affected the extraction yield. The masses extracted in ethanol were compared with the cumulated masses calculated from 72 feed and effluent samples, collected during filter operation, resulting in extraction yields between 0.5% and 30%. The composition of extracted micropollutants in ethanol reflected the concentrations in feed water of the pilot-scale filter. Desorption in water was mostly influenced by the solubility of the investigated micropollutants. The same substances found in the supernatants inf the experiments could also be identified in the backwash water of the filter.

Removal of per- and polyfluoroalkyl substances (PFASs) from contaminated groundwater using granular activated carbon: a pilot-scale study with breakthrough modeling

2019 ◽  
Vol 5 (11) ◽  
pp. 1844-1853 ◽  
Author(s):  
Charlie J. Liu ◽  
David Werner ◽  
Christopher Bellona
Keyword(s):  
Activated Carbon ◽  
Chain Length ◽  
Granular Activated Carbon ◽  
Pilot Scale ◽  
Contaminated Groundwater ◽  
Polyfluoroalkyl Substances

Pilot-scale treatment of PFAS contaminated groundwater with GAC; chain length dependent breakthrough; better PFAS adsorption correlated with more GAC transport pores; breakthrough modeling.

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