Investigation of microbial safety of a full-scale ozonation and biological activated carbon process under high humidity and temperature conditions

2011 ◽  
Vol 64 (11) ◽  
pp. 2293-2298 ◽  
Author(s):  
Tiejun Qiao ◽  
Xihui Zhang ◽  
Guangxue Wu ◽  
Doris W. T. Au
Keyword(s):  
Activated Carbon ◽  
Microbial Community ◽  
Pathogenic Bacteria ◽  
Pseudomonas Stutzeri ◽  
Opportunistic Pathogen ◽  
Full Scale ◽  
Microbial Safety ◽  
Bacillus Brevis ◽  
Biological Activated Carbon ◽  
Particle Counts

Microbial safety of a full-scale ozonation and biological activated carbon (BAC) process was investigated by examining pathogens, microbial community and particle counts, with emphasis on the BAC effluent. The process is located at South China, where the average humidity and air temperature were 70–80% and 22–24 °C, respectively. A high diversity of microbial community existed on the BAC media. Three types of dominant bacteria were identified, including Chryseobacterium indologenes, Bacillus brevis and Pseudomonas stutzeri, accounting for 90–95% of total bacteria number. As to pathogenic bacteria and viruses, an opportunistic pathogen, Bacillus cereus, was detected on the BAC. Six types of invertebrates were also observed on the medium, including rotifer, cyclops, nematode, clodecera, nauplius and blood worm. Diversity and number of invertebrates in the BAC effluent were higher than those in the BAC influent. Particle counts were generally less than 50 CNT/mL, with the maximum of 500 CNT/mL during the initial filtration stage after backwashing.

Removal of algal taste and odour compounds by granular and biological activated carbon in full-scale water treatment plants

2018 ◽  
Vol 18 (5) ◽  
pp. 1531-1544 ◽  
Author(s):  
Aisha Faruqi ◽  
Milann Henderson ◽  
Rita K. Henderson ◽  
Richard Stuetz ◽  
Brendan Gladman ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Algal Blooms ◽  
Pilot Scale ◽  
Full Scale ◽  
Biologically Active ◽  
Removal Rates ◽  
Biological Activated Carbon ◽  
Treatment Processes ◽  
Water Treatment Plants ◽  
Service Life Modelling

Abstract The occurrence and severity of cyanobacterial and algal blooms in water supplies has been increasing due to the effects of eutrophication and climate change, resulting in more frequent taste and odour (T&O) events. Conventional treatment processes have been found to be inefficient in removing the two most commonly detected algal T&O compounds, geosmin and 2-methylisoborneol (MIB), though granular activated carbon (GAC) and biological activated carbon (BAC) contactors have achieved high T&O removal rates. Literature on the performance of GAC and BAC for T&O removal in full-scale treatment plants, however, is limited. This review collates and assesses pilot-scale and full-scale studies which focus on removal of geosmin and MIB, with the aim of understanding the factors which influence T&O removal and determining knowledge gaps in the use of GAC and BAC. Age and empty bed contact time (EBCT) were found to have a significant impact on GAC performance, with removal efficiency decreasing with increased age and increasing with longer EBCTs. BAC contactors have achieved higher removal rates than non-biologically active GAC contactors and were not impacted by age, EBCT and/or carbon type. From these observations, implementation of BAC for T&O removal would be favourable; however, further investigations are required to understand full-scale performance of BAC and service life modelling.

Long term capacity of biological activated carbon filtration for organics removal

2002 ◽  
Vol 2 (1) ◽  
pp. 139-146 ◽  
Author(s):  
P.A.C. Bonné ◽  
J.A.M.H. Hofman ◽  
J.P. van der Hoek
Keyword(s):  
Activated Carbon ◽  
Water Supply ◽  
Pilot Plant ◽  
Full Scale ◽  
Sand Filtration ◽  
Two Stage ◽  
Slow Sand Filtration ◽  
Biological Activated Carbon ◽  
Running Time ◽  
Carbon Filtration

Since March 1995 Amsterdam Water Supply has applied biological activated carbon filtration (BACF) in the treatment process of the Leiduin plant. In this plant (capacity 70 × 106 m3/y) pretreated River Rhine water is infiltrated in the dune area, west of Amsterdam, for artificial recharge. Post treatment comprises rapid sand filtration, ozonation, hardness removal, biological activated carbon filtration and slow sand filtration. At the start the carbon reactivation frequency was set at 18 months, based on removal efficiencies for AOX (adsorbable organic halogens), DOC, pesticides and micropollutants. After four years of operation of a pilot plant (10 m3/hour) in parallel with the full-scale plant, the remaining removal capacity and the break-through profile of the carbon filters was investigated. In contrast to the full-scale plant, no carbon reactivation was applied in the pilot plant during the operation of 4 years. Spiking experiments were carried out after ozonation, in the influent of the biological activated carbon filtration with a cocktail of different pesticides after 1.5, 3 and 4 years. Influent concentrations varied between 2 to 10 μg/l. Without carbon reactivation the filter effluent still complies with the Dutch drinking water standards and guide lines, as well as with the Amsterdam Water Supply standards: DOC is less than 2 mg/l (actually 1.2 mg/l) and AOX remains below 5 μg/l. After four years, with spiking concentrations of 2 μg/l still no pesticide break-through was observed in the two-stage biological activated carbon filtration process. It can be concluded that a running time of 3 years between two reactivations in the two stage biological active carbon filtration is achievable, without negatively affecting the finished water quality. Average DOC concentrations will increase up to 1.2 mg/l, from 1 mg/l with running times of 2 years. After four years or 100,000 bedvolumes the AOC content is equal to or lower than 10 μg/l after biological activated carbon filtration. With slow sand filtration at the end and as polishing step AOC will be less than 10-5 μg/l. With every extension of six months duration time a saving of Euro 305,000 on reactivation costs is possible. With every 6 month extension of the running time of the carbon filters a saving of €610,000 is realised on the reactivation costs of the Leiduin treatment plant.

scholarly journals Identification of Antibiotic-Resistant Bacteria in the Primary Health Center in Bandung (Qualitative study in Puskesmas Ibrahim Adjie)

2020 ◽  
Vol 148 ◽  
pp. 04003
Author(s):  
Mayrina Firdayati ◽  
Anindrya Nastiti ◽  
Marlia Singgih ◽  
Elin Julianti ◽  
Muhammad Azhari ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
Antimicrobial Resistance ◽  
Pathogenic Bacteria ◽  
Pseudomonas Stutzeri ◽  
Opportunistic Pathogen ◽  
Resistant Bacteria ◽  
Healthcare Associated Infection ◽  
Healthcare Facilities ◽  
Primary Health ◽  
Healthcare Associated

The world is currently facing a serious health threat resulting from antimicrobial resistance (AMR). It is estimated that the global mortality related to AMR is roughly 700,000 per year and is expected to rise to 10 million annually by 2050. Healthcare facilities are among the main contributors of antimicrobial resistance. This study aims to identify the existence of antibiotic resistance bacteria in the air environment of the primary health facility (Puskesmas). Ten samples were collected in 4 different places of indoor environment in Puskesmas Ibrahim Adjie, Bandung, West Java. Antibiotic resistance bacteria (ARB) first selected by growing in 5 different selective media. There are 265 colonies which then selected and identified respectively by using Kirby-Bauer Method with Amoxicillin and Microgen Biochemical Identification. Three dominant bacteria Stenotrophomonas (Xanthomonas) maltophilia, Pseudomonas stutzeri and Serratia marcescens, were found. Those bacteria are not the main pathogenic bacteria but recently recognized as opportunistic pathogen combining a propensity for healthcare-associated infection and antimicrobial resistance.

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