assay Articles
-
Hurdles in the investigation of influent fractionation for measurement campaigns under diluted wastewater conditions
Evaluating the performance of a wastewater treatment plant (WWTP) requires a good characterization of the biodegradable substrate entering the plant. As is generally acknowledged, the wastewater characteristics under rain or storm weather conditions vary significantly from dry weather conditions but this is rarely accounted for in modelling exercises. In order to address this defect, a ...
-
Determination of pyrimidine dimers in the genomic DNA of Escherichia coli during photoreactivation following inactivation by medium-pressure UV lamp
A polychromatic medium-pressure (MP) UV lamp was compared with a monochromatic low-pressure (LP) UV lamp to investigate the inactivation and the subsequent photoreactivation of Escherichia coli . An endonuclease sensitive site (ESS) assay was applied to determine the number of UV-induced pyrimidine dimers in the genomic DNA of E.coli in parallel with a conventional colony forming assay. more than ...
-
Degradation of Amaranth azo dye in water by heterogeneous photo-Fenton process using FeWO4 catalyst prepared by microwave irradiation
FeWO4 particles were synthesized by a simple, rapid and facile microwave technique and their catalytic properties in heterogeneous photo-Fenton reaction were evaluated. This material was employed in the degradation of Amaranth azo dye. Individual and interactive effects of operational parameters such as pH, dye concentration and H2O2 dosage on the decolorization efficiency of Amaranth dye ...
-
Comparison of Fenton's oxidation and ozonation for removal of estrogens
This study compares efficiency of Fenton's oxidation and ozonation of 17β-estradiol (E2) and 17α-ethinylestradiol (EE2) as two possible processes for removal of estrogens from aqueous solutions. The effectiveness of Fenton's oxidative removal was studied at different ratios of reagents Fe2+:H2O2 (1:0.5; 1:10; 1:20; 1:33), where with some molar ratios up to 100% removal of E2 and EE2 was achieved ...
-
Toxicity Assessment Assays in Greece
Abstract :In this study the results of toxicity assessment assays in the area of Thessaloniki in Greece are presented.Daphnia magnatests were used for the assessment of freshwater and wastewater andArtemia salinatests for the assessment of seawater. There was increased toxicity in the seawater of inner Thermaikos gulf as well as in the freshwater of Koronia lake. Measures, taken to prevent toxic ...
-
Development of a recombinant Arxula adeninivorans cell bioassay for the detection of molecules with progesterone activity in wastewater
Abstract This study describes the development of a bioassay to detect the presence of progesterone and progesterone-like molecules in wastewater samples. The basis of the bioassay is the integration of the human progesterone receptor gene into the yeast Arxula adeninivorans for the constitutive synthesis of the receptor. After incubation, binding of the analyte to the receptor induces the ...
By QuoData GmbH
-
Impact of activated sludge process configuration on removal of micropollutants and estrogenicity
The efficacy of three different wastewater treatment configurations, conventional activated sludge (CAS), nitrifying activated sludge (NAS) and biological nutrient removal (BNR) for removal of selected micropollutants from authentic wastewater was investigated. The processes were also characterized based on their proficiency to reduce the estrogenic activity of the influent wastewater using the ...
-
Identification and risk assessment of human and veterinary antibiotics in the wastewater treatment plants and the adjacent sea in Tunisia
In the following study, we came up with and validated a prompt, sensitive and precise method for the simultaneous determination of 56 antimicrobial drugs (tetracyclines, sulfonamides, β-lactams, macrolides and quinolones) using the ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). This method was implemented with success to determine antibiotics in samples ...
-
Effects of wavelengths of medium-pressure ultraviolet radiation on photolyase and subsequent photoreactivation
This study aims to investigate the effect of different wavelengths (254, 266, 280 and 365 nm) in polychromatic medium-pressure (MP) UV radiation on the ability of photolyases in repairing dimers and discusses its impact on subsequent photoreactivation. Photolyase was exposed to various doses and irradiances of the UV wavelengths and the dimer repair abilities of the irradiated photolyase were ...
-
Total coliphages removal by activated sludge process and their morphological diversity by transmission electron microscopy
This study was conducted to isolate phages in treated sewage collected from wastewater treatment plant, and explore their morphological diversity by transmission electron microscopy (TEM). Fates of total bacteriophages and their reduction by biological treatment were also assayed. Phages were isolated using the plaque assay then negatively stained and observed by electron microscope. Electron ...
-
Effects of salinity on photoreactivation of
Escherichia coli after UV disinfectionThe effects of sodium chloride on photoreactivation of Escherichia coli were examined, assuming the discharge of ultraviolet (UV)-treated wastewater to water environment at different salinities. Suspensions of E. coli were first exposed to a low-pressure UV lamp in phosphate buffer to achieve 3 log inactivation, followed by an exposure to fluorescent light in NaCl solutions at the concentration ...
-
Removal efficiencies and kinetic rate constants of xenobiotics by ozonation in tertiary treatment
This study gives a full overview of the chemical oxidation by ozone of selected xenobiotics usually present in effluents of conventional wastewater treatment plants. A qualitative and quantitative overview of literature data was made, and describes the ozonation efficiency and processes for the elimination of 12 xenobiotics (pesticides and pharmaceuticals). A database was built, compiling ...
-
Comparative analysis of DNA-based microbial community composition and substrate utilisation patterns of activated sludge microorganisms from wastewater treatment plants operated under different conditions
In this study, the microbial community structure and carbon source utilisation profile of activated sludge samples collected from full-scale municipal wastewater treatment plants (WWTPs) operated under different conditions were characterised and compared, respectively, using terminal-restriction fragment length polymorphism (T-RFLP) analysis and Biolog assay. Samples were collected from each ...
-
Cyanobacteria and bacteria co-occurrence in a wastewater treatment plant: absence of allelopathic effects
Fifty-one cyanobacteria strains, belonging to Phormidium autumnale, Planktothrix mougeotii, Limnotrix sp. and Synechocystis sp. species, were isolated during a twelve months period, from a Wastewater Treatment Plant (WWTP) located in the north of Portugal. Isolated strains and environmental samples were analyzed by Polymerase Chain Reaction (PCR) technique to evaluate the presence of the genes ...
-
Optimizing removal of estrogenic compounds in biosolids: a comparison of anaerobic, post-aerobic, and cambi digestion
ABSTRACT Anaerobic digestion is a key treatment step during wastewater treatment because it is often the final significant solids treatment process prior to land application. Land application of biosolids is a vital practice for sustainable waste management; therefore, the presence of estrogenic compounds in biosolids is one concern to this practice. Three digestion processes were studied to ...
-
Application of Toxkit Microbiotests for Toxicity Evaluation of River Waters and Waste Waters in the Region of Warsaw in Poland
Abstract : The toxicity of surface waters (Vistula river in Warsaw) and of raw and treated wastewaters (treatment plants in Grodzisk Mazowiecki and in Piaseczno) has been measured at 2 occasions with 4 Toxkit microbiotests : the Algaltoxkit F™, the Daphtoxkit F™ pulex, the Thamnotoxkit F™ and the Protoxkit F™. Although the Vistula river is classified as being highly ...
-
Nutrient recovery from airplane wastewater: composition, treatment and ecotoxicological assay
For the 2014 World Cup and the 2016 Olympic Games, Brazil has expanded its airport infrastructure. This will lead to an increase in wastewater generation from aircrafts. This wastewater is traditionally taken from the aircrafts and disposed in the public sewage collection system. However, this residual water may have a different composition than the usual sanitary sewage. Therefore, it is ...
-
Reactor performance and pathogen removal during wastewater treatment by vermifiltration
The application of vermifiltration could reduce the load of chemical and biological pollutants present in wastewater, reducing the pressure over water requirements and allowing the reclamation of the treated water. In the present study, vermifiltration has shown a great potential for chemical pollutants and pathogen removal in wastewater through the synergistic interactions of earthworms and ...
-
Validation of a fully autonomous phosphate analyser based on a microfluidic lab-on-a-chip
This work describes the design of a phosphate analyser that utilises a microfluidic lab-on-a-chip. The analyser contains all the required chemical storage, pumping and electronic components to carry out a complete phosphate assay. The system is self-calibrating and self-cleaning, thus capable of long-term operation. This was proven by a bench top calibration of the analyser using standard ...
-
Effect of salinity on medium- and low-pressure UV disinfection of Vibrio cholerae
The problem of biological invasions attributed to ballast water release is an ongoing problem that threatens ecosystems and human health. Ultraviolet (UV) radiation has been increasingly used for ballast water treatment mainly due to the advantages of short contact time and minimized harmful disinfection by products. In this study, the impact of salinity on the inactivation of Vibrio cholerae ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you