Search results for " pol"
showing 10 items of 21911 documents
Particle balance and return loops for microplastics in a tertiary-level wastewater treatment plant.
2021
Highlights: Dewatering by centrifugation was a step that removed a high number of MPs from the sludge. Sludge retained especially the fibrous microplactics. Reject water transported microplastics inside a wastewater treatment plant. Disc filter-based tertiary treatment ensured removal of 99% of microplastics in wastewater. Microplastics (MPs) from households, stormwater, and various industries are transported to wastewater treatment plants (WWTPs), where a high proportion of them are captured before discharging their residuals to watersheds. Although recent studies have indicated that the removed MPs are mainly retained in wastewater sludge, sludge treatment processes have gained less atten…
Biopolymer Recovery from Aerobic Granular Sludge and Conventional Flocculent Sludge in Treating Industrial Wastewater: Preliminary Analysis of Differ…
2022
The recovery of biopolymers from sewage sludge could be a crucial step in implementing circular economy principles in wastewater treatment plants (WWTP). In this frame, the present study was aimed at evaluating the simultaneous production of polyhydroxyalkanoates (PHA) and extracellular polymeric substances (EPS) obtainable from the treatment of agro-industrial wastewater. Two biological enrichment systems, aerobic granular sludge (AGS) and a conventional activated sludge operating as a sequencing batch reactor (SBR), were monitored for 204 and 186 days, respectively. The maximum biopolymers accumulation capacity was close to 0.60 mgPHA-EPS gVSS−1 in the AGS when operating at 3 kgCODm…
Application of molecular imprinted polymers for selective solid phase extraction of bisphenol A
2016
Selective molecularly imprinted polymers (MIPs) with bisphenol A as template were synthesized using the non-covalent imprinting approach. MIPs were prepared using thermally initiated polymerization with 1,1’-azobis(cyclohexanecarbonitryle) (ACHN) as initiator and ethylene glycol dimethacrylate (EDMA) as a cross-linking agent. The tested functional monomers included methacrylic acid, acrylamide, and 4-vinylpyridine. The selectivity of the BPA-MIP for the solid phase extraction of bisphenol A was tested in samples containing other related alkylphenols. The polymers prepared in acetonitrile using methacrylic acid or acrylamide as monomer showed the highest selectivity towards target analyte (t…
Physical dispersion and disappearance of bacteria in the Golfo di Palermo: the results of two surveys.
2012
This paper reports on some results of two surveys at sea carried out in the surroundings of a urban wastewater discharge on the coast of the Golfo di Palermo, western Sicily (Italy). At the time of the surveys (year 2005) the stretch of water lying before the central part of the capital town received the untreated wastewater originating from about 200 000 inhabitants, which was discharged on-shore without any prior treatment by the free-surface outfall of “Porta Felice main sewer”. This outfall has crucial importance in the water quality; indeed, the Municipality is steadily implementing a plan featuring an intercepting main sewer along the coast and some pumping stations to connect all the…
Estimation of the Quality of Ground Waters Provided for the Water-Supply System in the Area of Gogolin Commune
2000
Krimināllikuma 102. panta piemērošana ūdens piesārņojuma novēršanai: praktiskās problēmas
2015
Krimināllikuma 102.pants paredz kriminālatbildību par noziedzīgiem nodarījumiem pret dabas vidi, taču praksē nākas saskarties ar problēmām noziedzīga nodarījuma sastāva kvalifikācijā. Vainīgās personas netiek sauktas pie kriminālatbildības, kā arī nav iespējams pierādīt personas vainu izdarītajā nodarījumā. Darbā tiek izstrādāti priekšlikumi likumdošanas pilnveidei ar mērķi izstrādāt vienotus kritērijus pēc kuriem būtu iespējams noteikt un paredzēt kaitīgo seku iestāšanos saistībā ar ūdens piesārņojumu, novēršot gadījumus, kad vainīgās personas netiek sauktas pie kriminālatbildības, jo nav iespējams konstatēt noziedzīga nodarījuma sastāvu. Atslēgvārdi: Krimināllikuma 102.pants; noziedzīgi n…
Natural and anthropogenic impacts on Greek karst water quality
2022
Diallyldimethylammonium Chloride (DADMAC) in Water Treated with Poly-Diallyldimethylammonium Chloride (PDADMAC) by Reversed-Phase Ion-Pair Chromatogr…
2023
Poly-diallyldimethylammonium (PDADMAC) chloride is a flocculant agent extensively used in water clarification treatments. Commercial polyelectrolyte formulations often contain residual monomer (DADMAC), reaction by-products and other reactants as contaminants that could potentially affect human health. In the present study, we optimized an analytical method based on reversed-phase ion-pair chromatography coupled with mass spectrometry for quantifying ultra-trace levels of DADMAC, without preliminary treatments, in drinking water distributed by the Palermo aqueduct. The method was validated in terms of accuracy (recovery between 80 to 120%), precision (RSD < 10%), linearity range (from 0.…
A Comparative Eye Tracking Study of Usability—Towards Sustainable Web Design
2021
Websites are one of the most frequently used communication environments, and creating sustainable web designs should be an objective for all companies. Ensuring high usability is proving to be one of the main contributors to sustainable web design, reducing usage time, eliminating frustration and increasing satisfaction and retention. The present paper studies the usability of different website landing pages, seeking to identify the elements, structures and designs that increase usability. The study analyzed the behavior of 22 participants during their interaction with five different landing pages while they performed three tasks on the webpage and freely viewed each page for one minute. Th…
Sociedad, Estado y Derecho en la tradición de pensamiento dialéctico
2006
Esta investigación es un síntesis de los elementos más importantes que podemos encontrar en la llamada "tradición de la escuela dialéctica". Comenzamos con una explicación de "la filosofía del Derecho" de GWF Hegel y, a continuación exponemos la contraposición de puntos de vista de la visión del Estado por parte de K. Marx(Idealismo vs. Materialismo). En el segundo capítulo, el tema es la recepción que ha efectuado la marxista "Escuela de Frankfurt" de la política y las teorías sociológicas de M. Weber. Finalmente, exponemos de manera breve la teoría sobre el Estado moderno de J. Habermas, que trata de dar una solución a los problemas de la modernidad apuntados por los autores "Escuela de F…