Stability and transportability of biosolid colloids through undisturbed soil monoliths

Karathanasis, A. D.; Johnson, Dawn M.

doi:10.1016/j.geoderma.2005.02.006

Cited by 17 publications

(10 citation statements)

References 31 publications

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“…6b), a phenomenon called "self-healing" due to the formation of filter bridges . Similar particle release trends were observed by Laegdsmand et al (1999), Karathanasis (1999) and Karathanasis and Johnson (2006). Furthermore the initial increase followed by a decrease in particle concentration are probably caused by diffusion and straining Fig.…”

Section: Concentration Of Effluent Particlessupporting

confidence: 80%

Decrease in hydraulic conductivity and particle release associated with self-filtration in saturated soil columns

2008

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Section: Concentration Of Effluent Particlessupporting

confidence: 80%

Decrease in hydraulic conductivity and particle release associated with self-filtration in saturated soil columns

2008

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“…They are used in inks, paints, and other emulsions, pharmaceutical products, and are found naturally in clays, biological fluids such as blood, natural organic matter colloids, and petroleum and geological processes. The stability of colloidal particles during transport through porous media is important in separation processes and the spread of contaminants, nutrients, and bio-solids through soil [1][2][3][4][5][6][7][8][9][10]. In all applications it is necessary to be able to maintain the colloid in a dispersed with the particles suspended as individual particles and with minimal amounts of flocculation.…”

Section: Introductionmentioning

confidence: 99%

“…When highly charged nanoparticles are added to the microparticles at appropriate pH, the nanoparticles organize around the microparticle surface, though due to their high charge there is sufficient repulsion between nanoparticles to prevent them from depositing on the microparticle itself. This forms the charged "halo" of nanoparticles around the microparticles, which effectively creates an electrostatic repulsive force between two "haloed" 5 particles. The particles then remain stable in the same manner as highly charged microparticles alone, relying on the net charge to prevent flocculation.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Weakly Charged Microparticles Using Highly Charged Nanoparticles

Herman

Walz

2013

Langmuir

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An experimental investigation was conducted to evaluate the possible use of highlycharged spherical nanoparticles to stabilize an aqueous dispersion of weakly-charged microspheres. At low pH values, the surface of silica is weakly charged, which leads to flocculation of colloidal suspensions of silica microspheres. Binary solutions of weakly charged silica microspheres and highly charged polystyrene latex nanoparticles result in adsorption of the nanoparticles onto the surface of the silica microspheres. This effectively "recharges" the silica spheres, with effective zeta potentials increased to the range that is unfavorable for flocculation of microspheres in a silica-only solution. However, this does not guarantee stability, and comparisons between positively charged amidine latex nanoparticles and negatively charged sulfate latex nanoparticles indicate that the degree of coverage plays an important role in the restabilization. The sulfate latex nanoparticles do not cover the surface sufficiently, and though they seemingly provide sufficient charge, the weakly charged patches of the exposed silica substrate can lead to flocculation. The amidine latex nanoparticles, on the other hand, cover the surface more completely, and effectively prevent flocculation of the silica microspheres. The mechanisms responsible for this different adsorption and stabilizing behavior are not entirely understood, as both the amidine and sulfate latex nanoparticles are of similar size and the magnitude of the zeta potentials of the different particle types are comparable.iii

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“…The same authors noted that full flocculation is observed at pH 3 and 4, the pH at which the point of zero charge is reached for the clay fractions of horizons A and B, respectively. Karathanasis and Johnson (2006) evaluated the stability of water-suspended biosolid colloids from urban and agricultural waste and their transportability through undisturbed soils to assess the potential risks of those colloidal particles carrying contaminants associated with changes in organic waste applied to soils. The authors previously observed that biosolid colloids showed stability over a wide range of pH conditions and that lime-stabilized biosolid colloids were more stable than poultry manure, in which the pH and organic matter (OM) levels were the dominant factors affecting this stability.…”

Section: Water-dispersible Claymentioning

confidence: 99%

Disposição de resíduos sólidos no solo: efeito nos atributos físicos, químicos e na matéria orgânica

Mangieri

Filho

2015

Sem. Ci. Agr.

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ResumoAtualmente existe crescente preocupação com o destino final dos resíduos sólidos gerados pela sociedade. As áreas de despejos não podem ser consideradas ponto final para as substâncias contidas ou geradas nos resíduos sólidos. Atualmente, o uso sustentável dos recursos naturais, especialmente do solo e da água, tem-se constituído relevante devido ao aumento das atividades antrópicas. O uso agrícola é uma alternativa de disposição dos resíduos sólidos (lixiviado, biossólidos), considerando a hipótese que o uso destes seja promissor para a agricultura, o que resulta em redução dos custos de tratamento, reaproveitamento de nutrientes e a melhora das condições físicas e químicas dos solos. Assim, buscouse com esta revisão de literatura confirmar ou não a hipótese, a partir de dados já obtidos, quanto ao uso promissor destes resíduos na agricultura para diminuição do passivo ambiental que desafia os administradores públicos no desenvolvimento de uma gestão eficiente. Os seguintes sub-itens serão apresentados após a introdução: disposição atual de resíduos sólidos e problemas ambientais; uso dos resíduos sólidos na agricultura; efeito nos atributos químicos, físicos e na matéria orgânica do solo e considerações finais. Palavras-chave: Resíduos sólidos, lodo de esgoto, biossolidos, lixiviado AbstractCurrently, there is growing concern over the final destination of the solid waste generated by society. Landfills should not be considered the endpoint for substances contained or generated in solid waste. The sustainable use of natural resources, especially soil and water, has become relevant, given the increase in anthropogenic activities. Agricultural use is an alternative to solid waste (leachate, biosolid) disposal, considering the hypothesis that the agricultural use of waste is promising for reducing waste treatment costs, promoting nutrient reuse and improving the physical and chemical conditions of soil. Thus, this literature review, based on previously published data, seeks to confirm or disprove the hypothesis regarding the promising use of solid waste in agriculture to decrease the environmental liability that challenges public administrators in the development of efficient management. The text below addresses the following subtopics after the introduction: current solid waste disposal and environmental issues, the use of solid waste in agriculture, and the effect on the physical and chemical properties of soil and on organic matter, ending with final considerations.

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Stability and transportability of biosolid colloids through undisturbed soil monoliths

Cited by 17 publications

References 31 publications

Decrease in hydraulic conductivity and particle release associated with self-filtration in saturated soil columns

Decrease in hydraulic conductivity and particle release associated with self-filtration in saturated soil columns

Stabilization of Weakly Charged Microparticles Using Highly Charged Nanoparticles

Disposição de resíduos sólidos no solo: efeito nos atributos físicos, químicos e na matéria orgânica

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