Comparative composition and characteristics of methanogenic granular sludges treating industrial wastes under different conditions

Bhatti, Zafar Iqbal; Furkukawa, Kenji; Fujita, Masanori

doi:10.1016/0922-338x(95)90616-8

Cited by 36 publications

(16 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The role of substrate degradation and diffusion kinetics on granule structure was well explained using SEM and TEM micrographs [12]. A composition and characteristics analysis of granular sludge through SEM and TEM micrographs also showed that organic loading rate and feed type influence the methanogens population in granules [13].…”

Section: Introductionmentioning

confidence: 98%

Modeling effects of granules on the start-up of anaerobic digestion of dairy wastewater with Langmuir and extended Freundlich equations

Pandey

Ndegwa

Alldredge

et al. 2010

Bioprocess Biosyst Eng

View full text Add to dashboard Cite

The effects of granules-inocula on the start-up of anaerobic reactors treating dairy manure were studied in a batch-fed reactor. The effects of start-up period and ratio of granules to feed were analyzed. Results indicated that the effects of start-up period could be described by Langmuir model, while the Extended Freundlich model could be used to model the effects of ratio of granules to feed on cumulative biogas production. In addition, transmission electron microscopes (TEM) and scanning electron microscope analysis were conducted to elucidate the distribution of microbial population and micro-colonies in granules and manure. From the TEM micrographs analyses, the ratios the Syntrophobacter and methanogens in granule and manure were shown to be 1.57 +/- 0.42 and 0.22 +/- 0.20, respectively. These results demonstrated that granules-inocula could reduce the period required for onset of biogas by 25%.

show abstract

Section: Introductionmentioning

confidence: 98%

Modeling effects of granules on the start-up of anaerobic digestion of dairy wastewater with Langmuir and extended Freundlich equations

Pandey

Ndegwa

Alldredge

et al. 2010

Bioprocess Biosyst Eng

View full text Add to dashboard Cite

show abstract

“…11 Bhatti et al 12 and Veiga et al 13 showed that growth temperature, substrates (formate and H 2 /CO 2 ) and the key nutrients (nitrogen and phosphate concentrations) affected the polymer production and composition of methanogenic granular sludge, and thus the sorption properties. The formation of metal complexes by ligands present in biological material (ie extracellular polymeric substances: EPS) has also been described.…”

Section: Introductionmentioning

confidence: 98%

Nickel and cobalt sorption on anaerobic granular sludges: kinetic and equilibrium studies

Hullebusch

Zandvoort

Lens

2004

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

The kinetics and equilibria of sorption of the divalent metal ions cobalt and nickel onto anaerobic granular sludge are described. Single component and binary equimolar systems were studied at different pH values (pH 6, 7 and 8). The kinetic modelling of metal sorption by anaerobic granular sludge has been carried out using Lagergren equations. On fitting the experimental kinetic data both in firstand pseudo-second-order equations, the regression analysis of a pseudo-second-order equation gave a higher r 2 value, indicating that both external mass transfer and intra-particle diffusion are involved in the sorption process. The experimental isotherm data were analysed using the Langmuir, Freundlich and Redlich-Peterson equations. The Redlich isotherm, a combination of the Langmuir and Freundlich equations, was found to have the highest regression correlation coefficients at pH 7. At pH 8, the Langmuir mechanism dominated for cobalt and nickel adsorption. In contrast, at pH 6, the Freundlich equation gave a better correlation coefficient which suggests a more heterogeneous adsorption at that pH.

show abstract

“…Precipitation of phosphate minerals has been mainly investigated through analyses of the ash content of granular sludge but, as far as we know, no exhaustive local or chemical analyses have been conducted [8,17,18]. Moreover, the prediction of this phenomenon using geochemical models and a thermodynamic database for precipitation has not yet been evaluated.…”

Section: Introductionmentioning

confidence: 97%

Location and chemical composition of microbially induced phosphorus precipitates in anaerobic and aerobic granular sludge

Manas

Sperandio

Decker³

et al. 2012

Environmental Technology

View full text Add to dashboard Cite

This work focuses on combined scanning electron microscopy and energy dispersive X-ray analysis (SEM-EDX) applied to granular sludge used for biological treatment of high-strength wastewater effluents. Mineral precipitation is shown to occur in the core of microbial granules under different operating conditions. Three dairy wastewater effluents, from three different upflow anaerobic sludge blanket (UASB) reactors and two aerobic granular sequenced batch reactors (GSBR) were evaluated. The relationship between the solid phase precipitation and the chemical composition of the wastewater was investigated with PHREEQC software (calculation of saturation indexes). Results showed that pH, Ca:P ratios and biological reactions played a major role in controlling the biomineralization phenomena. Thermodynamics calculations can be used to foresee the nature of bio-precipitates, but the location of the mineral concretions will need further investigation as it is certainly due to local microbial activity.

show abstract

Comparative composition and characteristics of methanogenic granular sludges treating industrial wastes under different conditions

Cited by 36 publications

References 21 publications

Modeling effects of granules on the start-up of anaerobic digestion of dairy wastewater with Langmuir and extended Freundlich equations

Modeling effects of granules on the start-up of anaerobic digestion of dairy wastewater with Langmuir and extended Freundlich equations

Nickel and cobalt sorption on anaerobic granular sludges: kinetic and equilibrium studies

Location and chemical composition of microbially induced phosphorus precipitates in anaerobic and aerobic granular sludge

Contact Info

Product

Resources

About