Can sludge dewatering reactivate microorganisms in mesophilically digested anaerobic sludge? Case of belt filter versus centrifuge

Erkan, Merve; Sanin, F. Dilek

doi:10.1016/j.watres.2012.10.028

Cited by 18 publications

(10 citation statements)

References 35 publications

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“…For example, regrowth of fecal coliforms, E. coli and Enterococci, occurred after Chen et al (2011) dewatered thermophilic and mesophilic AD effluent by centrifugation (Chen et al, 2011). In a similar study, Erkan and Sanin (2013) showed that belt filter dewatering caused 0.6 log decreases in indicator organisms, while 0.7-1.4 log increases occurred after centrifugation. Contrarily, the introduction of effluent to the soil can improve bacterial decomposer communities and improve nutrient cycling .…”

Section: Pathogen Regrowthmentioning

confidence: 81%

Beyond land application: Emerging technologies for the treatment and reuse of anaerobically digested agricultural and food waste

et al. 2015

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Effective treatment and reuse of the massive quantities of agricultural and food wastes generated daily has the potential to improve the sustainability of food production systems. Anaerobic digestion (AD) is used throughout the world as a waste treatment process to convert organic waste into two main products: biogas and nutrient-rich digestate, called AD effluent. Biogas can be used as a source of renewable energy or transportation fuels, while AD effluent is traditionally applied to land as a soil amendment. However, there are economic and environmental concerns that limit widespread land application, which may lead to underutilization of AD for the treatment of agricultural and food wastes. To combat these constraints, existing and novel methods have emerged to treat or reuse AD effluent. The objective of this review is to analyze several emerging methods used for efficient treatment and reuse of AD effluent. Overall, the application of emerging technologies is limited by AD effluent composition, especially the total solid content. Some technologies, such as composting, use the solid fraction of AD effluent, while most other technologies, such as algae culture and struvite crystallization, use the liquid fraction. Therefore, dewatering of AD effluent, reuse of the liquid and solid fractions, and land application could all be combined to sustainably manage the large quantities of AD effluent produced. Issues such as pathogen regrowth and prevalence of emerging organic micro-pollutants are also discussed.

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Section: Pathogen Regrowthmentioning

confidence: 81%

Beyond land application: Emerging technologies for the treatment and reuse of anaerobically digested agricultural and food waste

et al. 2015

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“…It must be noted that inactivation of fecal coliforms, Salmonella, or E. coli in anaerobic digestion processes, even those meeting time-temperature treatment standards, should be evaluated with care. Several studies have demonstrated that these bacteria can enter a viable-but-not-culturable (VBNC) state and can be resuscitated under the correct conditions, which are as yet not fully elucidated (Chen et al, 2011;Erkan & Sanin, 2013;Fu et al, 2014;Pascual-Benito et al, 2015). The occurrence of VBNC organisms was more significant under thermophilic than mesophilic conditions (Fu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Bench‐scale Analysis of Surrogates for Anaerobic Digestion Processes

Carroll

Long

2016

Water Environment Research

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Frequent monitoring of anaerobic digestion processes for pathogen destruction is both cost and time prohibitive. The use of surrogates to supplement regulatory monitoring may be one solution. To evaluate surrogates, a semi-batch bench-scale anaerobic digester design was tested. Bench-scale reactors were operated under mesophilic (36 °C) and thermophilic (53-55 °C) conditions, with a 15 day solids retention time. Biosolids from different facilities and during different seasons were examined. USEPA regulated pathogens and surrogate organisms were enumerated at different times throughout each experiment. The surrogate organisms included fecal coliforms, E. coli, enterococci, male-specific and somatic coliphages, Clostridium perfringens, and bacterial spores. Male-specific coliphages tested well as a potential surrogate organism for virus inactivation. None of the tested surrogate organisms correlated well with helminth inactivation under the conditions studied. There were statistically significant differences in the inactivation rates between the facilities in this study, but not between seasons.

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“…; Viau and Peccia ; Chen et al . ; Erkan and Sanin ). Although pathogen ‘regrowth’ was observed in both thermophilic digestion and mesophilic digestion, this phenomenon was interestingly found more pronounced in thermophilic digested sludge (Higgins et al .…”

Section: Introductionmentioning

confidence: 96%

“…Some researchers have applied quantitative PCR (qPCR) method to investigate the VBNC occurrence of indicator bacteria (Higgins et al . ; Viau and Peccia ; Erkan and Sanin ). However, qPCR would overestimate the abundance of viable bacterial cells as DNA from dead cells in digested sludge also could be simultaneously extracted and amplified (Nocker et al .…”

Section: Introductionmentioning

confidence: 99%

“…; Chen et al . ,b; Erkan and Sanin ), which often fail to be detected by cultivation but can regain the cultivability if the living conditions improve. Because of the presence of VBNC indicator bacteria during anaerobic digestion, it is necessary to reassess the inactivation and removal of bacterial pathogens in the biosolids during and after anaerobic digestion.…”

Section: Introductionmentioning

confidence: 99%

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Quantification of viable but nonculturable Salmonella spp. and Shigella spp. during sludge anaerobic digestion and their reactivation during cake storage

Qian

Liu

et al. 2015

J Appl Microbiol

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Can sludge dewatering reactivate microorganisms in mesophilically digested anaerobic sludge? Case of belt filter versus centrifuge

Cited by 18 publications

References 35 publications

Beyond land application: Emerging technologies for the treatment and reuse of anaerobically digested agricultural and food waste

Beyond land application: Emerging technologies for the treatment and reuse of anaerobically digested agricultural and food waste

Bench‐scale Analysis of Surrogates for Anaerobic Digestion Processes

Quantification of viable but nonculturable Salmonella spp. and Shigella spp. during sludge anaerobic digestion and their reactivation during cake storage

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