Effects of some alkyl phenols on methanogenic degradation of phenol

Wang, Yi‐Tin; Suidan, Makram T.; Pfeffer, John T.; Najm, Issam

doi:10.1128/aem.54.5.1277-1279.1988

Cited by 30 publications

(4 citation statements)

References 14 publications

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“…Th is relatively modest temperature decline would seem to be insuffi cient for the large increase in the concentrations of malodors. It is likely that a seasonal decline, related to shorter days or falling temperatures, in the populations of organisms such as photosynthetic bacteria (Wenke and Vogt, 1981) and/or methanogenic consortia (Wang et al, 1988;Gu and Berry, 1991) were at least partially responsible for increases in the concentrations of malodors. Do et al (2003), for instance, found that the population of photosynthetic purple nonsulfur bacteria peaked in the late summer to early fall and that Rhodobacter sp.…”

Section: Resultsmentioning

confidence: 99%

Equilibrium Sampling Used to Monitor Malodors in a Swine Waste Lagoon

2008

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The concentrations of malodorous compounds in a 0.4-ha anaerobic lagoon that received waste from approximately 2000 sows were monitored during the late summer to late fall of 2006 to gain insight into the factors influencing their concentrations. Selected malodorous compounds were measured by the use of equilibrium samplers consisting of submersible stir plates and stir bar sorbtive sampling with polydimethylsiloxane-coated magnetic stir bars. During the same period, air and water temperatures, suspended solids, total organic carbon and nitrogen content, and wastewater pH were recorded. Concentrations of malodorous compounds were higher at the surface of the lagoon than at the middle or bottom of the lagoon. Skatole concentration, for instance, averaged 54, 24, and 38 microg L(-1) near the surface, in the middle, and at the lowest sampling depths, respectively. While the lagoon was being pumped down during field application of wastewater, concentrations of malodorous compounds fluctuated widely, increased 16-fold as compared with the sampling period before pumping, and continued to increase as fall progressed and temperatures cooled. Suspended solids, volatile suspended solids, and total organic carbon increased near the bottom of the lagoon during this same period. The increases in the concentrations of malodorous compounds in the wastewater during the fall could have been due to a combination of several factors. These factors include reduced degradation by lagoon bacteria, less wind stripping of volatile compounds from the lagoon surface due to lowering of the lagoon surface after crop application, and/or reduced evaporation of malodorous compounds due to falling temperatures.

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Section: Resultsmentioning

confidence: 99%

Equilibrium Sampling Used to Monitor Malodors in a Swine Waste Lagoon

2008

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“…El hecho de que haya diferencias de producción de metano pueden atribuirse a la acumulación de ácidos grasos volátiles (AGV) en algunos digestores. Además, las bajas concentraciones (5 y 10 g SV) pueden ser insuficientes para activar la actividad de los microorganismos causando estrés microbiano, disminución del pH y fallas en los digestores [13]. No obstante, los resultados obtenidos de este trabajo han hecho que la producción de metano obtenida refleje valores similares a otros sustratos previamente reportados por Cuetos et al [14] y Bayr et al [15], donde la producción de metano varío entre 400 a 700 NmL de CH 4 /g SV, aunque las condiciones iniciales y parámetros de operación fueron diferentes.…”

Section: Potenciales De Metano De Los Residuos De Mataderounclassified

Methane Production from Slaughterhouse Waste and Wheat Straw: Influence of Concentration

Meneses-Quelal

2021

espoch

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The indiscriminate generation of slaughterhouse waste and agricultural waste can present pollution problems in the environment. An alternative to counteract these problems is the anaerobic digestion of waste through the production of biogas and methane as clean and renewable energy. In this sense, this study aimed to optimize methane production from anaerobic codigestion of slaughterhouse waste from cattle and wheat straw. The treatments were evaluated using anaerobic sludge as inoculum from the wastewater treatment plant of the city of Ibarra. The tests were carried out under mesophilic conditions (38°C) in digesters with a useful volume of 186 ml. The influence of the substrate concentration was evaluated by anaerobically digesting 45 samples at different concentrations (5, 10 and 15 g VS/l) with a substrate/inoculum ratio of 1:2. The highest accumulated methane yield occurred in the digesters composed of 15 g VS/l. The maximum methane production was 320.48 Nml/g VS. The kinetics of the tests were adjusted with the cone model, where there were correlations greater than 99%. Keywords: biogas, methane, codigestion, synergy, inoculum, kinetics. Resumen La generación indiscriminada de residuos de matadero y desechos agrícolas pueden presentar problemas de contaminación en el medio ambiente. Una alternativa para contrarrestar estos problemas es la digestión anaeróbica de los desechos mediante la produción de biogás y metano como energía limpia y renovable. En este sentido el objetivo de este estudio es la optimización de la producción de metano a partir de la codigestión anaeróbica de residuos de matadero de ganado vacuno y paja de trigo. Los tratamientos se evaluaron empleando como inóculo lodo anaerobio de la planta de tratamiento de aguas residuales de la ciudad de Ibarra. Los ensayos se realizaron en condiciones mesofílicas (38°C) en digestores de 186 ml de volumen útil. La influencia de la concentración del sustrato se evaluó digiriendo anaeróbicamente 45 muestras a diferentes concentraciones (5, 10 y 15 g SV/l) con una relación sustrato/inóculo de 1:2. El mayor rendimiento acumulado de metano se produjo en los digestores compuestos por 15 g SV/l. La producción máxima de metano fue de 320,48 Nml/g SV. La cinética de los ensayos se ajustó con el modelo del cono, donde se tuvo correlaciones superiores al 99%. Palabras Clave: biogás, metano, codigestión, sinergia, inóculo, cinética.

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“…Bourgeois and Eisenhardt (1988) pointed out that the organization was changing its structure to adapt to this changing trend [3] . Pfeffer and Baron (1988) found that there was a clear interest link between structural change and organization [4][5] . This results in an obvious different form of governance of the traditional division and the market -the formation and formation of the form of network governance.…”

Section: Literature Reviewmentioning

confidence: 99%

Research on Service Network Governance Structure

Xu¹,

Zhao²,

Wu³

2018

Proceedings of the 2017 7th International Conference on Education and Management (ICEM 2017)

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The article analyzed the attitude and role of stakeholders in the service industry, straighten out the logic relationship, construct both bottom-up and top-down sandwich type vertical structure, but also horizontally through the multi-agent coordination management to realize the subject interests and industrial balanced network governance structure of service industry in the end, in view of the governance structure and mechanism of service industry, based on the governance oriented service industry development countermeasure and the suggestion.

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Effects of some alkyl phenols on methanogenic degradation of phenol

Cited by 30 publications

References 14 publications

Equilibrium Sampling Used to Monitor Malodors in a Swine Waste Lagoon

Equilibrium Sampling Used to Monitor Malodors in a Swine Waste Lagoon

Methane Production from Slaughterhouse Waste and Wheat Straw: Influence of Concentration

Research on Service Network Governance Structure

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