scholarly journals Evaluation of Activated Sludge Die-Away Test (OECD Test Guideline 314B) for Assessing the Removal of Surfactants in Wastewater Treatment Systems Using Ester-Amide-Type Dialkylamine Salt

2019 ◽  
Vol 42 (3) ◽  
pp. 79-89
Author(s):  
Ayame MAIHARA ◽  
Hiroshi HONDA ◽  
Katsumi MATSUMOTO ◽  
Yasuki HONDA ◽  
Masayuki YAMANE ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Test Guideline ◽  
Wastewater Treatment Systems ◽  
Oecd Test Guideline

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

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.

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.

Cost Comparison of Aerobic and Anaerobic Wastewater Treatment Systems

1985 ◽  
Vol 17 (1) ◽  
pp. 255-255 ◽  
Author(s):  
P Rantala ◽  
P Väänänen
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Waste Treatment ◽  
Cost Comparison ◽  
Soil Conditions ◽  
Aerobic Treatment ◽  
Case Examples ◽  
Different Types ◽  
Combination Of Methods ◽  
Wastewater Treatment Systems

The costs of different types of aerobic, anaerobic and combined wastewater treatment systems are compared in this study. The assumed BOD or COD-loads from typical forest industry processes form the basis of comparison. General cost curves for various waste treatment processes and some case examples are also presented. In the calculations it is assumed that the wastewater is treated to the same effluent quality by using activated sludge, modified activated sludge and combination of anaerobic-aerobic treatment process. In anaerobic-aerobic systems different types of combinations are analyzed. Investment, running and annual costs have been evaluated for each system. The study shows that selection of the method or combination of methods must always be made case by case. It has been found out that in some cases the anaerobic-aerobic process combination is economically competitive. Competitiveness will increase if biogas can be utilized and a moderate price could be calculated for it. In some cases activated sludge, and especially aerated lagoon processes, has a disadvantage of requiring larger treatment spaces. Poor soil conditions and long distances to lead effluent may significantly increase the cost of these aerobic treatment methods.

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