Biodegradability of activated sludge organics under anaerobic conditions

Ekama, G. A.; Sötemann, SW; Wentzel, M. C.

doi:10.1016/j.watres.2006.08.014

Cited by 67 publications

(34 citation statements)

References 11 publications

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“…Chandler also used the lignin content to calculate a biodegradable fraction of organic wastes in anaerobic conditions (Chandler (1980) cited in [21]). Several authors deem that the biodegradable fraction of a waste is unchanged under anaerobic or aerobic conditions [73,74]. Indeed, a linear relationship between the lignin content and biodegradability was also found in aerobic conditions [75].…”

Section: Biodegradable Potentialmentioning

confidence: 99%

Characterization of Solid Digestates: Part 1, Review of Existing Indicators to Assess Solid Digestates Agricultural Use

Teglia

Trémier

Martel

2010

Waste Biomass Valor

137

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Anaerobic digestion of organic wastes is clearly encouraged by current regulations in Europe. In complement to the energy supply it represents, this biological treatment process also allows the recycling of organic matter and nutrients contained in biodegradable wastes. Indeed the digestion residue can be further promoted as soil improver or fertilizer. The sustainability of anaerobic digestion plants partly depends on the management of these digestion residues. Digestates present particular characteristics that can reduce their direct agricultural valorization and minimize by the way the benefit of such a biological treatment. Thus the first part of this two part paper aims at reviewing and discussing a wide range of biochemical, biological and physical indicators used to assess the agronomic quality of organic products and the feasibility of an aerobic treatment by composting. The definition of agronomic quality is very complex and no single parameter can be picked out to assess the quality of solid digestates coming from different sources. A relevant choice of these parameters will lead to state on digestates agricultural use, whether they can be directly used on soil after digestion or if they need a composting post-treatment before utilization. The second part of this two part paper will choose indicators to characterize several digestates in order to assess their future agricultural use.

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Section: Biodegradable Potentialmentioning

confidence: 99%

Characterization of Solid Digestates: Part 1, Review of Existing Indicators to Assess Solid Digestates Agricultural Use

Teglia

Trémier

Martel

2010

Waste Biomass Valor

137

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“…Digestion is a commonly used biologic process for the stabilization of WAS discharged from the wastewater treatment plants (WWTPs) [4,5]. Sludge digestion can be performed under either aerobic or anaerobic conditions [2].…”

Section: Introductionmentioning

confidence: 99%

A hybrid membrane process for simultaneous thickening and digestion of waste activated sludge

Wang

et al. 2010

Front. Environ. Sci. Eng. China

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A hybrid membrane process for simultaneous sludge thickening and digestion (MSTD) was studied. During one cycle (15 d) of operation under a hydraulic retention time of 1 d, the concentration of mixed liquor suspended solids (MLSS) continuously increased from about 4 g$L -1 to 34 g$L -1 , and the mixed liquor volatile suspended solids (MLVSS) increased from about 3 g$L -1 to over 22 g$L -1 . About 42% of the MLVSS and 39% of the MLSS reduction were achieved. The thickening and digestion effects in the MSTD were further analyzed based on a mass balance analysis. Test results showed that biopolymers and cations of biomass were gradually released to the bulk solution during the process. It was also found that the capillary suction time, colloidal chemical oxygen demand, soluble microbial products, viscosity, and MLSS had significant positive correlations with the membrane fouling rate, whereas extracellular polymeric substances, polysaccharides, and proteins extracted from biomass had negative impacts on membrane fouling.

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“…Anaerobic digestion involves the decomposition of organic matter and inorganic matter in the absence of molecular oxygen, and this process has been widely used in most of wastewater treatment plants (WWTPs) [1,2] . The advantages of two-phase anaerobic digestion (TPAD) over the conventional single-phase process have been gradually verified [3,4] .…”

Section: Introductionmentioning

confidence: 99%

Mesophilic Two-Phase Anaerobic Digestion of Waste Activated Sludge with Different VS Contents

Zhang

Yin

Liu

et al. 2009

2009 3rd International Conference on Bioinformatics and Biomedical Engineering

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Two types of waste activated sludge (WAS) and kitchen garbage were used to prepare the WAS samples with different volatile solid (VS) contents, and the digestion efficiencies of prepared samples were investigated by mesophilic two-phase anaerobic digestion (TPAD) process. The experimental results showed that the ratio of volatile fatted acids and bicarbonate alkalinity (VFA/BA) in acidogenic phase was 0.05 for the system with the addition of kitchen garbage, and those of WAS samples were both lower than 0.02, indicating better stabilization of the two-phase systems. The VS and total COD removal efficiencies increased with increasing hydraulic retention time (HRT). The maximum removal efficiencies of VS and total COD were achieved when the HRT was 20d, and the maximum VS and total COD removal efficiencies were 47.9% and 49.2%, respectively. The specific methanogenic activity (SMA) and methane content of biogas both increased with increasing HRT. The addition of kitchen garbage into the low organic WAS sample could improve both organic removal efficiency and biogas yield.

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Biodegradability of activated sludge organics under anaerobic conditions

Cited by 67 publications

References 11 publications

Characterization of Solid Digestates: Part 1, Review of Existing Indicators to Assess Solid Digestates Agricultural Use

Characterization of Solid Digestates: Part 1, Review of Existing Indicators to Assess Solid Digestates Agricultural Use

A hybrid membrane process for simultaneous thickening and digestion of waste activated sludge

Mesophilic Two-Phase Anaerobic Digestion of Waste Activated Sludge with Different VS Contents

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