Biodegradation potential and bacterial diversity of a petrochemical wastewater treatment plant in Iran

Shokrollahzadeh, Soheila; Azizmohseni, Farzaneh; Golmohammad, Fereshteh; Shokouhi, H.; Khademhaghighat, F

doi:10.1016/j.biortech.2007.12.034

Cited by 142 publications

(58 citation statements)

References 24 publications

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“…Bacillus sp. is widely found in WWTPs (Shokrollahzadeh et al 2008). B. licheniformis is a Gram-positive, spore-forming soil bacterium, which produces an assortment of extra cellular enzymes that may contribute to nutrient cycling in nature (Remoroza et al 2015).…”

Section: Genetic Structure Of Airborne Bacterial Communitiesmentioning

confidence: 99%

Site-related and seasonal variation of bioaerosol emission in an indoor wastewater treatment station: level, characteristics of particle size, and microbial structure

Ding

Han

et al. 2015

Aerobiologia

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The emission of the airborne bacteria and fungi from an indoor wastewater treatment station adopting an integrated oxidation ditch with a vertical circle was investigated. Microbial samples were collected by the six-stage viable Andersen cascade impactor, and the samples were collected in triplicate in each sampling site per season. Culture-based method was applied to determine the concentrations of the airborne bacteria and fungi, while the cloning/ sequencing method was used to characterize the genetic structure and community diversity of airborne bacteria. The highest concentrations of airborne bacteria (4155 ± 550 CFU/m 3 ) and fungi (883 ± 150 CFU/m 3 ) were obtained in June (summer). The lowest concentration of bacteria (1458 ± 434 CFU/m 3 ) was determined in January (winter), and the lowest concentration of fungi (169 ± 40 CFU/m 3 ) was found in March (spring), respectively. The particle size distribution analysis showed that most culturable bacteria obtained in all the sampling sites were in the particle size range of 1.1-4.7 lm. Most culturable fungi had particle sizes in the range 1.1-3.3 lm. Microbial population analysis showed that Bacillus sp., Acinetobacter sp., and Lysinibacillus were the main groups obtained in S1.Enterobacter was the dominant group in sampling site S2. Both the concentrations and particle size distribution of the bioaerosols in the enclosed space presented a seasonal and site-related variation. Concentration and richness of microorganisms in bioaerosols in June were higher than in September and January. The particle size distribution varied between the sampling sites, and proportion of large particles was higher in S2 than in S1 because of the settlement of large particles. Pathogenic species, such as Acinetobacter lwoffii, Staphylococcus saprophyticus, and Enterobacter sp., were isolated from the bioaerosols, which could pose serious latent danger to sewage workers' health.

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Section: Genetic Structure Of Airborne Bacterial Communitiesmentioning

confidence: 99%

Site-related and seasonal variation of bioaerosol emission in an indoor wastewater treatment station: level, characteristics of particle size, and microbial structure

Ding

Han

et al. 2015

Aerobiologia

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“…Under stressful environmental conditions, the cells of Bacillus produce oval endospores that remain dormant for extended periods and can invade respiratory epithelial cells and cause pulmonary infection. Due to their biodegradation of organic compounds and hazardous substances, Bacillus is widespread in water (Shokrollahzadeh et al, 2008;Zulkifly et al, 2010) and a significant contributor to bioaerosols in WWTS atmospheres. The diversities of bacterial species were 1.24 for SEP, 1.70 for SEPV and 2.19 for ODC.…”

Section: Genetic Structure Of Airborne Bacterial Communitiesmentioning

confidence: 99%

Reduction and characterization of bioaerosols in a wastewater treatment station via ventilation

Guo

Ding

et al. 2014

Journal of Environmental Sciences

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Bioaerosols from wastewater treatment processes are a significant subgroup of atmospheric aerosols. In the present study, airborne microorganisms generated from a wastewater treatment station (WWTS) that uses an oxidation ditch process were diminished by ventilation.Conventional sampling and detection methods combined with cloning/sequencing techniques were applied to determine the groups, concentrations, size distributions, and species diversity of airborne microorganisms before and after ventilation. There were 3021 ± 537 CFU/m 3 of airborne bacteria and 926 ± 132 CFU/m 3 of airborne fungi present in the WWTS bioaerosol.Results showed that the ventilation reduced airborne microorganisms significantly compared to the air in the WWTS. Over 60% of airborne bacteria and airborne fungi could be reduced after 4 hr of air exchange. The highest removal (92.1% for airborne bacteria and 89.1% for fungi) was achieved for 0.65-1.1 μm sized particles. The bioaerosol particles over 4.7 μm were also reduced effectively. Large particles tended to be lost by gravitational settling and small particles were generally carried away, which led to the relatively easy reduction of bioaerosol particles 0.65-1.1 μm and over 4.7 μm in size. An obvious variation occurred in the structure of the bacterial communities when ventilation was applied to control the airborne microorganisms in enclosed spaces.

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“…Under stressful environmental conditions, the cells produce oval endospores that remain dormant for extended periods and can invade respiratory epithelial cells and cause pulmonary infection (Coudron et al 1991;Parsons et al 2008). Due to their biodegradation of organic compounds and hazardous substances, Bacillus is widespread in water (Palela et al 2008;Shokrollahzadeh et al 2008;Zulkifly et al 2010) and a significant contributor to bioaerosols in WWTP atmosphere.…”

Section: Dominant Groups and Their Distribution Characteristicsmentioning

confidence: 99%

Assessing genetic structure, diversity of bacterial aerosol from aeration system in an oxidation ditch wastewater treatment plant by culture methods and bio-molecular tools

Han

Liu

2012

Environ Monit Assess

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Airborne bacteria emissions from oxidation ditch with rotating aeration brushes were investigated in a municipal wastewater treatment plant in Beijing, China. Microbial samples were collected at different distances from the rotating brushes, different heights above the water surface, and different operation state over a 3-month period (April, May, and June) in order to estimate the seasonal variation and site-related distribution characteristics of the microorganisms present. The concentration of bacterial aerosol was analyzed by culture methods, while their dominant species, genetic structure and diversity were assayed using bio-molecular tools. Results showed that total microbial concentrations were highest in June and lowest in April. The mechanical rotation caused remarkable variation in concentration and diversity of culturable airborne bacteria before and after the rotating brushes. The highest concentration was observed near the rotating brushes (931±129-3,952±730 CFU/m 3 ), with concentration decreasing as distance and height increased. Bacterial community polymerase chain reaction and denaturing gradient gel electrophoresis indicated that diversity decreased gradually with increasing height above the water surface but remained relatively constant at the same height. All dominant bacteria identified by DNA sequence analysis belonged to Firmicutes. Pathogenic species such as Moraxella nonliquefaciens and Flavobacterium odoratum were isolated from the bioaerosols. Due to the serious health risks involved, exposure of sewage workers to airborne microorganisms caused by brush aerators should be monitored and controlled.

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Biodegradation potential and bacterial diversity of a petrochemical wastewater treatment plant in Iran

Cited by 142 publications

References 24 publications

Site-related and seasonal variation of bioaerosol emission in an indoor wastewater treatment station: level, characteristics of particle size, and microbial structure

Site-related and seasonal variation of bioaerosol emission in an indoor wastewater treatment station: level, characteristics of particle size, and microbial structure

Reduction and characterization of bioaerosols in a wastewater treatment station via ventilation

Assessing genetic structure, diversity of bacterial aerosol from aeration system in an oxidation ditch wastewater treatment plant by culture methods and bio-molecular tools

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