Recalcitrant Substances
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Humic substances and its distribution in coffee crop under cover crops and weed control methods
ABSTRACT Humic substances (HS) comprise the passive element in soil organic matter (SOM), and represent one of the soil carbon pools which may be altered by different cover crops and weed control methods. This study aimed to assess HS distribution and characteristics in an experimental coffee crop area subjected to cover crops and cultural, mechanical, and c
Sci. agric. (Piracicaba, Braz.). Publicado em: 2016-08
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2. Carbon in Humic Fractions of Organic Matter in Soil Treated with Organic Composts under Mango Cultivation
ABSTRACT Soil organic matter (SOM) plays a key role in maintaining the productivity of tropical soils, providing energy and substrate for the biological activity and modifying the physical and chemical characteristics that ensure the maintenance of soil quality and the sustainability of ecosystems. This study assessed the medium-term effect (six years) of th
Rev. Bras. Ciênc. Solo. Publicado em: 2016
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3. Fósforo em cronossequência de cana-de-açúcar queimada no cerrado goiano: análise de ácidos húmicos por RMN de 31P
The aim of this study was to identify, with the use of 31P NMR spectroscopy, organic P species in humic acids (HA) in samples from Oxisol cultivated in chronosequence with sugar cane, pasture and Cerrado. The main forms of P-type found were orthophosphate, monoester-P (phosphate sugars) and P-diester (orthophosphate). The 31P NMR technique proved capable of
Quím. Nova. Publicado em: 2013
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4. Avaliação do tratamento de lixiviado de aterro sanitário através de processo oxidativo avançado conjugado com sistema de separação por membranas
The landfill leachate is characterized by high recalcitrant organic matter concentration, ammonia and toxic compounds. This effluent can be an environmental problem due to its high pollutant potential when it is released without treatment. Studies reported in the literature showed that biological processes are not sufficient in meeting the discharge standard
Publicado em: 2010
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5. Tratamento físico-químico de lixiviado de aterro sanitário pré-tratado por processo biológico aeróbio. / Physico-chemical treatment of landfill leachate from pre-treated by aerobic biological process.
Landfill leachates present high ammonia and organic matter concentrations, besides other pollutants, which do not allow its discharge to the environment without a previous treatment. Older landfill leachates, with more stabilized organic matter, present great pollutant potential, mainly due to the presence of recalcitrant substances that not often are remove
Publicado em: 2009
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6. Experimental study and mathematical modeling of hybrid solar reactor for phenol degradationby photo-Fenton process. / Estudo experimental e modelagem matemática de reator solar híbrido para degradação de fenol em solução aquosa pelo processo foto-Fenton.
Wastewaters containing hazardous, or recalcitrant organic substances are generated in a wide variety of industrial processes. The inadequate management of these effluents can cause contamination of underground and surface water. Their treatment by conventional processes may not be technically efficient, and usually prevents effluents from being discarded or
Publicado em: 2009
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7. Morphogenesis in vitro, phytochemical analysis and anatomical characterization of neem (Azadirachta indica A. Juss) / Morfogênese in vitro, análise fitoquímica e caracterização anatômica de nim (Azadirachta indica A. Juss)
The Azadirachta indica A. Juss species, popularly known as neem, belongs to the Meliaceae family, which has great potential for azadirachtin (AZA) production; however, neem has recalcitrant seeds, cross-pollination and variable content of AZA. Four experiments were conducted in order to understand the in vitro growth limiting factors of these plants and chan
Publicado em: 2009
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8. CEFALOSPORINAS E SURFACTANTE NÃO-IÔNICO EM EFLUENTE HOSPITALAR: DETERMINAÇÃO, DEGRADAÇÃO POR MEIO DE FOTÓLISE E ELETROCOAGULAÇÃO E IDENTIFICAÇÃO DE SUBPRODUTOS E METABÓLITOS / CEFALOSPORINS AND NON IONIC SURFACTANTS IN HOSPITAL WASTEWATER: DETERMINATION, DEGRADATION BY MEANS OF PHOTOLYSIS AND ELECTROCOAGULATION AND IDENTIFICATION OF BYPRODUCTS AND METABOLITES
The currently incorrect and excessive consumption of pharmaceuticals and surfactants, mainly domestic usage, has become a concern to the scientific community around the world, due to the environmental consequences with regard to the bacterial resistance (characteristic of antibiotics), and alteration of hormonal systems (provoked by the degradation products
Publicado em: 2009
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9. Transferência do carbono de resíduos da colheita de eucalipto para frações da matéria orgânica do solo / Carbon transference from eucalypt harvest residues to soil organic matter fractions
Eucalypt plantation areas in Brazil have increased continuously over the years. The practice of removing more lignified material, such as bark and branches, from the ground after wood harvesting in eucalypt forests may prevent the stabilization of carbon (C) in recalcitrant fractions of soil organic matter (SOM). The recalcitrance of such organic fractions i
Publicado em: 2008
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10. Estudo da evaporaÃÃo de lixiviados de aterros sanitÃrios como alternativa tecnolÃgica de tratamento: testes em bancada
The leachate from landfill contains high pollution load and its composition gives large amounts of ammonia, chlorides, recalcitrant substances, organic and inorganic compounds. Such waste can cause negative effects on the environment and interfere with the performance of biological processes for their degradation. The choice of technology appropriate treatme
Publicado em: 2008
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11. O objeto/sujeito da redução de danos: uma análise da literatura da perspectiva da saúde coletiva / The object/subject of harm reduction: an analysis of literature through collective health perspective
This essay had the goal of describing and analyzing the object/subject of harm reduction, based on Brazilian literature, having as theoretical perspective the Collective Health bases. International literature shows that harm reduction has been adopted and spread in several countries. North America and Europe focus the debate on the evaluation of strategies i
Publicado em: 2008
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12. Combinação de tratamento biológico aeróbio com processos oxidativos avançados visando intensificar a remoção de matéria orgânica em efluentes da indústria têxtil e de celulose kraft / Combining aerobic biological treatment and advanced oxidation processes to increase organic matter removal in textile and kraft pulp mill effluents
Bleached kraft pulp and textile effluents contain hard to degrade and, or toxic substances, and these industries often cannot meet legal limits for effluent chemical oxygen demand using conventional effluent treatment. Use of advanced oxidation processes (AOPs) is therefore being studied to treat their effluents. AOPs use a strong oxidizing agent to degrade
Publicado em: 2007