scholarly journals Assessing the degradation of ochratoxin a using a bioassay: the case of contaminated winery wastewater

2007 ◽  
Vol 56 (2) ◽  
pp. 55-61 ◽  
Author(s):  
R. Nogueira ◽  
I. Estevinho ◽  
L. Abrunhosa ◽  
C. Mendonça ◽  
P. Machado ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Microbial Activity ◽  
Ochratoxin A ◽  
Experimental Work ◽  
Biomass Concentration ◽  
Biological Degradation ◽  
Batch Experiments ◽  
Wastewater Treatment Systems ◽  
Conventional Wastewater Treatment

In vineyards the presence of certain fungi may lead to the production of the mycotoxin ochratoxin A (OTA) and subsequent contamination of grapes and wine. Furthermore, winery wastewaters contaminated with OTA may represent an environmental hazard. Therefore, it is imperative to assess the fate of this mycotoxin in conventional wastewater treatment systems. The aim of the present work was to assess the biological degradation of OTA. Experimental work was carried out in batch experiments with initial OTA to biomass concentration ratios of 1.4 μg mg−1, 7.4 μg mg−1 and, 11.9 μg mg−1. The assays were inoculated with activated sludge biomass unadapted to the substance under examination. The proposed bioassay demonstrates that OTA concentrations up to 100 μg L−1 can be degraded by microbial activity in activated sludge.

Emerging investigators series: revisiting greenhouse gas mitigation from conventional activated sludge and anaerobic-based wastewater treatment systems

2018 ◽  
Vol 4 (11) ◽  
pp. 1739-1758 ◽  
Author(s):  
Siming Chen ◽  
Moustapha Harb ◽  
Pooja Sinha ◽  
Adam L. Smith
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Greenhouse Gas ◽  
Anaerobic Treatment ◽  
Greenhouse Gas Mitigation ◽  
Formation Mechanisms ◽  
Conventional Activated Sludge ◽  
Wastewater Treatment Systems

Elucidation of N2O formation mechanisms in aerobic-based wastewater treatment is essential for effective greenhouse gas mitigation, whereas mainstream anaerobic treatment requires improved methane recoverability.

Fate of Terpene Compounds in Activated Sludge Wastewater Treatment Systems

1999 ◽  
Vol 49 (6) ◽  
pp. 734-739 ◽  
Author(s):  
Franklin R. Alvarez ◽  
Glenn M. Shaul ◽  
E. Radha Krishnan ◽  
Daniel L. Perrin ◽  
Maqsud Rahman
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Systems

A model for predicting nitrous oxide production during denitrification in activated sludge

1996 ◽  
Vol 34 (5-6) ◽  
pp. 99-106 ◽  
Author(s):  
H. Wicht
Keyword(s):  
Nitrous Oxide ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
Batch Experiments ◽  
Monod Kinetics ◽  
Influence Of Temperature ◽  
Influent Concentration ◽  
Oxide Production ◽  
Nitrous Oxide Production

To examine the importance of certain conditions on the production of nitrous oxide during denitrifications batch experiments with activated sludge were conducted. With the obtained parameters and a Monod kinetics based model the nitrous oxide concentrations in a CSRT were calculated. The influence of temperature, pH, nitrate influent concentration, readily biodegradable COD influent concentration, H2S and oxygen inhibitor concentrations are discussed. The presented model helps in understanding some previously described phenomena of nitrous oxide production in wastewater treatment plants.

scholarly journals Occurrence of fungi degrading aromatic hydrocarbons in activated sludge biocenoses

2014 ◽  
Vol 31 (1) ◽  
pp. 67-75
Author(s):  
Anna Grabińska-Łoniewska ◽  
Tomasz Słomczyński ◽  
Elżbieta Pajor ◽  
Katarzyna Kołosowska
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Aromatic Hydrocarbons ◽  
Soil Bioremediation ◽  
Exhaust Gases ◽  
Anaerobic Wastewater Treatment ◽  
Aerobic And Anaerobic ◽  
Wastewater Treatment Systems ◽  
Gases Purification

A set of 21 strains of yeast-like microorganisms isolated from biocenoses of aerobic and anaerobic wastewater treatment systems were assayed for their ability to utilize aromatic hydrocarbons as a sole C-source. Basing on the achieved results, the highly biochemically active strains for application in enhancing of wastewaters and exhaust gases purification as well as soil bioremediation were selected.

scholarly journals Comparison of Biodegradation of Fats and Oils by Activated Sludge on Experimental and Real Scales

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1286 ◽  
Author(s):  
Pedro Cisterna-Osorio ◽  
Patricia Arancibia-Avila
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Fats And Oils ◽  
Mass Loading ◽  
Physical Treatment ◽  
Treatment Unit ◽  
Wastewater Treatment Systems

Fats and oils are the most common pollutants in wastewater, and are usually eliminated through physical processes in wastewater treatment plants, generating large amounts of fats and residual oils that are difficult to dispose of and handle. The degradation of fatty wastewater was studied in a real wastewater treatment plant and a laboratory scale treatment unit. The wastewater treatment plant, located in Chile, was designed for a population of 200,000 inhabitants. It includes an aerobic digester that receives fat and oils retained in a degreaser and treats the fats and oils together with biomass. The biodegradation of fats and oils was analyzed in both wastewater treatment systems. Key parameters were monitored such as the concentration of fats and oils in the influents and effluents, mass loading, and the efficiency of biodegradation. The mass loading range was similar in both wastewater treatment systems. In the experimental activated sludge plant, the biodegradation of fats and oils reached levels in the range of 64% to 75%. For the wastewater treatment plant with an aerobic digester, the levels of biodegradation of fats and oils ranged from 69% to 92%. Therefore, considering the efficiency of the elimination of fats and oils, the results indicated that physical treatment should be replaced with biological treatment so that the CO2 generated by the biodegradation will be incorporated into the carbon cycle and the mass of fats and oils in landfills will be reduced.

Low-cost biosensors for continuous performance assessment of natural-based wastewater treatment systems

2021 ◽  
Author(s):  
Marta Fernandez-Gatell ◽  
Xavier Sanchez-Vila ◽  
Jaume Puigagut
Keyword(s):  
Wastewater Treatment ◽  
Electric Current ◽  
Microbial Activity ◽  
Low Cost ◽  
Domestic Wastewater ◽  
Electric Signal ◽  
Bioelectrochemical Systems ◽  
Operational Conditions ◽  
Treatment Facilities ◽  
Wastewater Treatment Systems

<p>Bioelectrochemical systems (BES) are devices that transform the chemical energy of organic and inorganic substrates into an electric current. BES represents a particularly interesting biosensor technology for monitoring the performance of  remote/isolated wastewater treatment facilities (such as constructed wetlands). The work presented here aimed to assess the potential use of the electric signal produced by low-cost, membrane-less BES systems as an indicator of the operational conditions and treatment performance of natural-based wastewater treatment systems. For this purpose, several BES configurations and operation modes working under real domestic wastewater conditions were monitored.</p><p>Results showed that the electric current produced by the BES significantly correlates with key parameters in biological-based wastewater treatment systems such as microbial activity and biomass, water COD or solids accumulation. Therefore, our work demonstrates the feasibility of applying bioelectrochemical-based low-cost biosensors for the improvement and control of natural-based wastewater treatment systems.</p><p> </p><p> </p><p>Keywords: bioelectrochemical systems, wastewater, microbial activity, organic matter, low-cost, biosensor</p>

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