Macromolecular composition and anaerobic degradation of the sludge produced in a sequencing batch reactor

Chelme, Susana; Fonseca, Pamela; Mercado, Rodrigo; Alarcón, Nelson; Sánchez, Omar

doi:10.2225/vol11-issue3-fulltext-12

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…The removal of TKN and TAN appears to be also effective, 57 and 61 %, respectively, without increasing nitrite and nitrate concentrations in the effluent. Partial simultaneous nitrification-denitrification process (SND) could occur in the outer compartment (oxic conditions), where increasing dissolved oxygen (DO) concentrations from the lower water layers (gravel bed) to the upper water layers are present (Chelme et al 2008). Chiu et al (2007) studied the influence of COD/NH 4 + ratios on SND process treating domestic wastewater and they stated that a minimum value of 6 for this ratio as well as low DO levels (0.3-0.8 mg l -1 ) are needed for a partial SND process.…”

Section: Discussionmentioning

confidence: 99%

Technical and economic feasibility of gradual concentric chambers reactor for sewage treatment in developing countries

Mendoza

Carballa

Sitorus

et al. 2009

Electron. J. Biotechnol.

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A major challenge in developing countries concerning domestic wastewaters is to decrease their treatment costs. In the present study, a new cost-effective reactor called gradual concentric chambers (GCC) was designed and evaluated at lab-scale. The effluent quality of the GCC reactor was compared with that of an upflow anaerobic sludge bed (UASB) reactor. Both reactors showed organic matter removal efficiencies of 90%; however, the elimination of nitrogen was higher in the GCC reactor. The amount of biogas recovered in the GCC and the UASB systems was 50% and 75% of the theoretical amount expected, respectively, and both reactors showed a slightly higher methane production when the feed was supplemented with an additive based on vitamins and minerals. Overall, the economical analysis, the simplicity of design and the performance results revealed that the GCC technology can be of particular interest for sewage treatment in developing countries

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Section: Discussionmentioning

confidence: 99%

Technical and economic feasibility of gradual concentric chambers reactor for sewage treatment in developing countries

Mendoza

Carballa

Sitorus

et al. 2009

Electron. J. Biotechnol.

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show abstract

“…EPS contains several types of proteins, carbohydrates, humic and fulvic acid that coat the NP surface. [31][32][33] An anionic detergent; SDS coats the NP surface and provides steric stability by increasing the surface charge. 28 The EPS was used for stabilizing the biosynthesized and chemically synthesized Se NPs via an electro-steric mechanism.…”

Section: Surface Adsorption Of Dispersants On Nanoparticlesmentioning

confidence: 99%

“…30 Sludge extract has numerous organic and inorganic compounds dissolve in it that helps to sustain the dispersion stability. [31][32][33] An anionic detergent; SDS coats the NP surface and provides steric stability by increasing the surface charge. 34,35 Fig.…”

Section: Dispersion Stability Analysismentioning

confidence: 99%

A comparative analysis of a TiO₂nanoparticle dispersion in various biological extracts

Yadav

Mungray

2015

RSC Adv.

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Chemical surfactants are used for efficient dispersion of nanoparticles (NPs) but they also cause a hazard to the environment. Therefore, research is required to replace such chemicals with eco-friendly ones. In the present study, the dispersion of TiO 2 NPs in various biologically originating extracts was investigated and compared with that of sodium dodecyl sulphate (SDS), a chemical surfactant. The adsorption of extract components on TiO 2 NPs was checked and confirmed by UV-vis spectroscopy and Fourier transform infrared spectroscopy (FT-IR). Dynamic light scattering was used to analyze the particle size distribution (PSD) and zeta potential (ZP) of the TiO 2 NPs. The ANOVA test suggests that there was no difference in the PSD and ZP of the various dispersions, indicative of similar dispersion behavior. Turbiscan analysis was used to measure the stability of TiO 2 NPs in biological dispersions, which was found to be equivalent to the dispersion stability in SDS. The biodegradability of dispersions was compared using chemical oxygen demand (COD) on day 1 and 15 after inoculation with sludge in both aerobic and anaerobic conditions. The maximum biodegradability achieved among the biological extracts was 92% while the SDS showed the least biodegradability (<5%) after 15 days of incubation. Our results demonstrate the suitability of biological compounds as NP stabilizers, and strongly recommend further research work for complete replacement of chemical surfactants for environmental safeguard.

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Development of Bio-PORec® system for polyhydroxyalkanoates (PHA) production and its storage in mixed cultures of palm oil mill effluent (POME)

Din

Ponraj

Ujang

et al. 2012

Bioresource Technology

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Macromolecular composition and anaerobic degradation of the sludge produced in a sequencing batch reactor

Cited by 4 publications

References 13 publications

Technical and economic feasibility of gradual concentric chambers reactor for sewage treatment in developing countries

Technical and economic feasibility of gradual concentric chambers reactor for sewage treatment in developing countries

A comparative analysis of a TiO₂nanoparticle dispersion in various biological extracts

Development of Bio-PORec® system for polyhydroxyalkanoates (PHA) production and its storage in mixed cultures of palm oil mill effluent (POME)

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Macromolecular composition and anaerobic degradation of the sludge produced in a sequencing batch reactor

Cited by 4 publications

References 13 publications

Technical and economic feasibility of gradual concentric chambers reactor for sewage treatment in developing countries

Technical and economic feasibility of gradual concentric chambers reactor for sewage treatment in developing countries

A comparative analysis of a TiO2nanoparticle dispersion in various biological extracts

Development of Bio-PORec® system for polyhydroxyalkanoates (PHA) production and its storage in mixed cultures of palm oil mill effluent (POME)

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A comparative analysis of a TiO₂nanoparticle dispersion in various biological extracts