Search results for "ATAL"
showing 10 items of 10591 documents
Salinity affects nitrate removal and microbial composition of denitrifying woodchip bioreactors treating recirculating aquaculture system effluents
2019
Abstract This study investigated the effect of salinity on microbial composition and denitrification capacity of woodchip bioreactors treating recirculating aquaculture system (RAS) effluents. Twelve laboratory-scale woodchip bioreactors were run in triplicates at 0, 15, 25, and 35 ppt salinities, and water chemistry was monitored every third day during the first 39 days of operation. Microbial communities of the woodchips bioreactors were analyzed at the start, after one week, and at the end of the trial. Woodchip bioreactors removed nitrate at all salinities tested. The highest NO3-N removal rate of 22.0 ± 6.9 g NO3-N/m3/d was obtained at 0 ppt, while 15.3 ± 4.9, 12.5 ± 5.4 and 11.8 ± 4.0…
The effect of peracetic acid on microbial community, water quality, nitrification and rainbow trout (Oncorhynchus mykiss) performance in recirculatin…
2020
Microbial biofilters control water quality and enable the overall function of recirculation aquaculture systems (RAS). Changes in environmental conditions can affect the abundance and interactions of the diverse microbial populations of the biofilter, affecting nitrification of harmful ammonium and thus fish health. Here, we examined the effect of different application frequencies (0, 1, 2 and 4 times per week) of a common disinfectant, peracetic acid (PAA, applied 1.1 mg l−1 twice per day), on biofilter microbial communities, focusing especially on nitrifying microbial groups and using a high throughput sequencing of 16S rRNA gene and quantitative PCR (qPCR). In addition, we measured biofi…
Enhanced nitrogen removal of low carbon wastewater in denitrification bioreactors by utilizing industrial waste toward circular economy
2020
Aquaculture needs practical solutions for nutrient removal to achieve sustainable fish production. Passive denitrifying bioreactors may provide an ecological, low-cost and low-maintenance approach for wastewater nitrogen removal. However, innovative organic materials are needed to enhance nitrate removal from the low carbon effluents in intensive recirculating aquaculture systems (RAS). In this study, we tested three additional carbon sources, including biochar, dried Sphagnum sp. moss and industrial potato residues, to enhance the performance of woodchip bioreactors treating the low carbon RAS wastewater. We assessed nitrate (NO3−) removal and microbial community composition during a one-y…
Salinity affects nitrate removal and microbial composition of denitrifying woodchip bioreactors treating recirculating aquaculture system effluents
2019
This study investigated the effect of salinity on microbial composition and denitrification capacity of woodchip bioreactors treating recirculating aquaculture system (RAS) effluents. Twelve laboratory-scale woodchip bioreactors were run in triplicates at 0, 15, 25, and 35 ppt salinities, and water chemistry was monitored every third day during the first 39 days of operation. Microbial communities of the woodchips bioreactors were analyzed at the start, after one week, and at the end of the trial. Woodchip bioreactors removed nitrate at all salinities tested. The highest NO3-N removal rate of 22.0 ± 6.9 g NO3-N/m3/d was obtained at 0 ppt, while 15.3 ± 4.9, 12.5 ± 5.4 and 11.8 ± 4.0 g NO3-N/…
Microbial communities in full-scale woodchip bioreactors treating aquaculture effluents.
2021
Woodchip bioreactors are being successfully applied to remove nitrate from commercial land-based recirculating aquaculture system (RAS) effluents. In order to understand and optimize the overall function of these bioreactors, knowledge on the microbial communities, especially on the microbes with potential for production or mitigation of harmful substances (e.g. hydrogen sulfide; H2S) is needed. In this study, we quantified and characterized bacterial and fungal communities, including potential H2S producers and consumers, using qPCR and high throughput sequencing of 16S rRNA gene. We took water samples from bioreactors and their inlet and outlet, and sampled biofilms growing on woodchips a…
Synthesis and characterization of ethylene-1-hexene copolymers prepared by using MgCl2(THF)2-supported Ziegler-Natta catalysts
2000
Ethylene was copolymerized with 1-hexene over vanadium (VOCl3 and VCl4) and titanium (TiCl4) catalysts supported on MgCl2(THF)2 and activated with Et2AlCl. So far these catalyst systems have not been known as initiators of ethylene-1-hexene copolymerization. The vanadium catalysts were more active than the titanium catalyst and, at identical comonomer concentrations in the feed, gave rise to a greater incorporation of 1-hexene into the copolymer. Even at relatively low fractions of 1-hexene, the MgCl2(THF)2-supported catalysts affected much the copolymer properties like density, melting point and crystallinity.
La depressione perinatale: correlazioni tra madri e padri
2012
La responsabilidad transfronteriza por productos defectuosos en la Unión Europea
2015
Liability for defective products meets a modern legal framework applicable to cases which have an international nature in the European Union. However, the new regulatory developments have not solved the existing coordination problems and offer an unjustified complexity, so there is a certain risk that the objectives pursued by the European legislator in this strategic sector for the EU internal market are not going to be fulfilled. The objective of this study is to analyze the solutions contained in Regulation (EC) 442001, relating to jurisdiction, the recognition and enforcement of judgments in civil and commercial matters and Regulation (EC) 8642007, concerning the law applicable to non-c…
Dictamen Anteproyecto de Ley de Bienestar Animal CV
2020
Se encuentra en estos momentos en fase de tramitación el Anteproyecto de Ley sobre protección, bienestar y tenencia de animales de compañía de la Comunidad Valenciana, cuyo texto introduce importantes novedades en esta materia respecto a la normativa vigente en nuestro territorio. Además, el texto prevé la derogación de la actual Ley 4/1994, de 8 de julio, de la Generalitat, de protección de los animales de compañía (vid. Disposición Derogatoria Única del Anteproyecto). Por parte de la Federación de Caza de la Comunidad Valenciana se nos solicita que elaboremos un dictamen sobre la posible inconstitucionalidad de algunos de los preceptos que incorpora el citado Anteproyecto, así como de las…
Desobediencia: ¿Derecho o estrategia? A propósito de la reivindicación de la “política de desobediencia civil” en Catalunya
2018
RESUMEN: Aunque la tradicion de la desobediencia civil y, mas lejos aun, la del derecho a resistencia tiene antecedentes muy claros, hoy se ha producido un giro. El incremento del fenomeno de la indignacion y revuelta contra el sistema ha propiciado lo que algunos consideran estrategia de desobediencia e incluso politica de desobediencia. Em este articulo se discute esa hipotesis desde la experiencia que procura la experiencia vivida en los dos ultimos anos en Cataluna. ABSTRACT: We are possibly facing a turning point in the tradition of the right of resistance and even civil disobedience. From the globalization of the phenomenon of the indignados, the recourse to the strategy of disobedie…