Biofilm Processes and Control in Water and Wastewater Treatment

Butler, Caitlyn S.; Boltz, Joshua P.

doi:10.1016/b978-0-12-382182-9.00083-9

Cited by 29 publications

(18 citation statements)

References 137 publications

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“…Other authors also observed a higher activity in biofilm systems compared to suspended biomass in terms of the removal of OMPs [40], confirming the importance of the biomass physical conformation. One of the reasons indicated is the higher capacity of biofilms to protect the bacteria against adverse conditions such as the presence of inhibitors [41,42].…”

Section: Omp Removalmentioning

confidence: 99%

An innovative wastewater treatment technology based on UASB and IFAS for cost-efficient macro and micropollutant removal

Arias

Alvarino

Allegue

et al. 2018

Journal of Hazardous Materials

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An innovative process based on the combination of a UASB reactor and an IFAS system is proposed in order to combine different redox conditions and biomass conformations to promote a high microbial diversity. The objective of this configuration is to enhance the biological removal of organic micropollutants (OMPs) as well as to achieve the abatement of nitrogen by using the dissolved methane as an inexpensive electron donor. Results showed high removals of COD (93%) and dissolved methane present in the UASB effluent (up to 85%) was biodegraded by a consortium of aerobic methanotrophs and heterotrophic denitrifiers. Total nitrogen removal decreased slightly along the operation (from 44 to 33%), depending on the availability of electron donor, biomass concentration, and configuration (floccules and biofilm). A high removal was achieved in the hybrid system (>80%) for 6 of the studied OMPs. Sulfamethoxazole, trimethoprim, naproxen, and estradiol were readily biotransformed under anaerobic conditions, whereas ibuprofen or bisphenol A were removed in the anoxic-aerobic compartment. Evidence of the cometabolic biotransformation of OMPs has been found, such as the influence of nitrification activity on the removal of bisphenol A, and of the denitrification activity on ethinylestradiol removal.

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Section: Omp Removalmentioning

confidence: 99%

An innovative wastewater treatment technology based on UASB and IFAS for cost-efficient macro and micropollutant removal

Arias

Alvarino

Allegue

et al. 2018

Journal of Hazardous Materials

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show abstract

“…This observation therefore accentuated the fact that biofilm offers protection against exposure to antibiotics (Gupta, 2015;Naves et al, 2010). The extracellular polymeric matrix in biofilms shield microbes against stressors such as predators, chemical toxicants and fluctuations in temperature and osmotic pressure; allowing the microbe to persist at an interface by offering resistance to dehydration and access to nutrientrich microenvironments apart from upregulation of enzymes that breakdown complex organic molecules into more easily metabolized substrates (Butler & Boltz, 2014;DePas, 2014). It can therefore be construed that the environment and its inherent challenges stimulate microbes to transform into biofilms, their genetic predisposition notwithstanding.…”

Section: Discussionmentioning

confidence: 99%

Biofilms and Antimicrobial Susceptibility Profiles of Escherichia coli Recovered from Wastewater Treatment Plants in Kakamega Municipality, Kenya

Boge

Nyongesa

Okoth

et al. 2021

Egypt. J. Microbiol.

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S TUDIES have demonstrated high levels of ampicillin resistance among Escherichia coli occurring in wastewater and environmental systems in western Kenya. The current study investigated antimicrobial resistance profiles and biofilm formation abilities in presence and absence of sub-lethal ampicillin concentrations, of E. coli recovered from final sedimentation ponds of two wastewater treatment plants in Kakamega municipality. 34 non-duplicate E. coli isolates were recovered by direct plating of wastewater sample aliquots on MacConkey agar and their biofilm formation capabilities measured by crystal violet assay while disc diffusion and Polymerase Chain Reaction (PCR) techniques were used to determine their antibiotic resistance levels and ampicillin resistance genes respectively. The Spearman's Chi-square test at P≤ 0.05 was used to check for interdependence between antimicrobial resistance and biofilm formation capabilities. 58.8% of the isolates were multi-drug resistant (MDR) and 85.3% showed resistance to ampicillin, which was found to be encoded by bla TEM in 65% and bla SHV in 8.8%. The biofilm phenotype was exhibited by 61.8% of all the isolates, amongst which 23.6% showed a strong, 14.7% a moderate and 23.6% a weak propensity to form biofilms. This study revealed lack of association between antibiotic resistance and biofilm formation, but interestingly, ampicillin concentration of 8.0µg/ml triggered the highest biofilm biomass among the isolates. The findings drive at the conclusion that biofilm production among E. coli in wastewater treatment plants(WWTPs) does not correlate with antibiotic resistance, but may be an important protection mechanism against sub-lethal antimicrobial levels present in environmental milieu.

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“…[26], [27] Multiple previous studies have been conducted for nitrification process for removal AN and its group substances; Nitrite and Nitrate. [28] Nitrification process able to specific reduce ammonia content by Ammonia oxidizing bacteria (AOB) and Anaerobic Ammonium Oxidation (Annamox). [29], [30] In pilot case study, from a retrofit Sequencing Batch Reactor (SBR) to IFAS was conducted by Zhao 2018, the IFAS unit able to reduce 90% of CBOD and 96% of AN.…”

Section: Pollutant Removal Efficiencymentioning

confidence: 99%

Water Quality Assessment Klang River Water Treatment Plants

Mohiyaden

Sidek²,

Hayder³

et al. 2018

IJET

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The quality of Klang river water is deteriorating dramatically since it is in urban places every day and become one of the major problems. Therefore, the Malaysian government had initiated one river cleaning project named River of Life (ROL) project. This project is for rehabilitating and restoring the Klang river. A series of river water treatment plant (RWTP)s have been operated in Klang river catchment since 2014. Six RWTPs station has been monitored up to eight stations until presents. Eight parameters consisting of physio-chemical types and biological types have been recorded. RWTP effluent discharges are targeted to achieve Malaysia Interim National Water Quality Standard (INWQS) under Class II B. Since previous RWTP performance only emphasized on local river pollutants and certain conditions, this paper will investigate the effectiveness of full-scale RWTP unit process for river condition. Water quality assessment are involved which are consist of effluent water quality monitoring and pollutant removal efficiency. Most of the major pollutants able to be reduced by more than 50% reduction. Although BOD and AN still not able to achieve standard range gazetted by INWQS Class IIB, there is an improvement of river water quality at Klang River by using IFAS technology adopted in the RWTP system.

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Biofilm Processes and Control in Water and Wastewater Treatment

Cited by 29 publications

References 137 publications

An innovative wastewater treatment technology based on UASB and IFAS for cost-efficient macro and micropollutant removal

An innovative wastewater treatment technology based on UASB and IFAS for cost-efficient macro and micropollutant removal

Biofilms and Antimicrobial Susceptibility Profiles of Escherichia coli Recovered from Wastewater Treatment Plants in Kakamega Municipality, Kenya

Water Quality Assessment Klang River Water Treatment Plants

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