High-solids thermophilic anaerobic digestion of sewage sludge: effect of ammonia concentration

Takashima, Masanobu; Yaguchi, Junichi

doi:10.1007/s10163-020-01117-z

Cited by 16 publications

(10 citation statements)

References 24 publications

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“…The TAN in both digesters averaged about 2500 mg‐N/L. This TAN concentration might be close to inhibitory levels, as the authors previously observed process upset when TAN stayed at around 3000 mg‐N/L (Takashima & Yaguchi, 2021). More specifically, however, the control digester was found to fluctuate more in terms of the soluble organic concentrations in digester.…”

Section: Resultssupporting

confidence: 73%

“…Sewage sludge was adjusted to 7%–8% total solids (TS), an upper limit that did not cause serious ammonia inhibition to thermophilic digestion in an author's study (Takashima & Yaguchi, 2021). In the case of full‐scale mesophilic digestion with thermal pretreatment, sewage sludge is typically thickened to approximately 10% or higher (Barber, 2020).…”

Section: Methodsmentioning

confidence: 99%

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Performance improvement and decolourization in the high‐solid thermophilic anaerobic digestion of thermally pretreated sewage sludge

Takashima

Yaguchi

2022

Water & Environment J

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This laboratory-scale study attempted performance improvement and decolourization in the high-solid thermophilic anaerobic digestion of thermally pretreated sewage sludge, as it tends to be disturbed by ammonia inhibition and colour generation.Sewage sludge was adjusted to 7%-8% total solids (TS), and pretreated at 150 C for 1 h. The digesters were operated at 55 C and 20 days hydraulic retention time. An addition of powdered activated carbon (approximately 2% of the feed TS) significantly contributed to the removal of propionate and reduced the colour in digested sludge by about 27%. Microbial analysis detected less abundance of bacterial Synergistia and archaeal Methanosarcina and implied more hydrogenotrophic methanogenesis with the activated carbon addition. Conditioning with ferric chloride for dewatering digested sludge mitigated the colour of dewatered liquor by about 67%.Therefore, these methods were demonstrated to be effective and partly overcome the above-mentioned problems.

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Section: Resultssupporting

confidence: 73%

Section: Methodsmentioning

confidence: 99%

Performance improvement and decolourization in the high‐solid thermophilic anaerobic digestion of thermally pretreated sewage sludge

Takashima

Yaguchi

2022

Water & Environment J

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“…Takashima and Yaguchi [83] studied HSAD under thermophilic conditions, evaluating the digestion of sewage sludge and reporting successful operation after implementing an ammonia stripping stage applied to the digested sludge. The process also included the return of digestate back to the reactor.…”

Section: Increasing Reactor Productivity By the Increase In Solid Content And Temperaturementioning

confidence: 99%

Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

Ellacuriaga

García-Cascallana

Gómez

2021

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Anaerobic digestion is traditionally used for treating organic materials. This allows the valorization of biogas and recycling of nutrients thanks to the land application of digestates. However, although this technology offers a multitude of advantages, it is still far from playing a relevant role in the energy market and from having significant participation in decarbonizing the economy. Biogas can be submitted to upgrading processes to reach methane content close to that of natural gas and therefore be compatible with many of its industrial applications. However, the high installation and operating costs of these treatment plants are the main constraints for the application of this technology in many countries. There is an urgent need of increasing reactor productivity, biogas yields, and operating at greater throughput without compromising digestion stability. Working at organic solid contents greater than 20% and enhancing hydrolysis and biogas yields to allow retention times to be around 15 days would lead to a significant decrease in reactor volume and therefore in initial capital investments. Anaerobic digestion should be considered as one of the key components in a new economy model characterized by an increase in the degree of circularity. The present manuscript reviews the digestion process analyzing the main parameters associated with digestion performance. The novelty of this manuscript is based on the link established between operating reactor conditions, optimizing treatment capacity, and reducing operating costs that would lead to unlocking the potential of biogas to promote bioenergy production, sustainable agronomic practices, and the integration of this technology into the energy grid.

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“…Takashima and Yaguchi [37] studied the digestion of sewage sludge under HS-AD conditions and a thermophilic regimen. To prevent ammonia inhibitory problems, the authors implemented an ammonia stripping stage, applied to the digested sludge.…”

Section: The Effect Of Organic Loading On Digestion Performancementioning

confidence: 99%

“…Therefore, there is clear evidence on the limits imposed regarding the levels of inhibitory components and the water content of the system, and their removal from the liquid phase is a necessity during SS-AD to avoid excessive toxic effects. The strategy proposed by Takashima and Yaguchi [37] of introducing an ammonia-stripping stage in HS-AD systems treating sewage sludge seems reasonable and leads to an expectation of success in digestion systems operating at even higher solid contents. Indeed, this is what Farrow et al [81] intended when digesting poultry manure under a solid-phase configuration using struvite precipitation with pH controlled at around 7.0 during the ammonia removal stage to avoid adverse effects on the microbial biomass.…”

Section: Commercial Technologies For Ss-admentioning

confidence: 99%

High-Solid Anaerobic Digestion: Reviewing Strategies for Increasing Reactor Performance

et al. 2021

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High-solid and solid-state anaerobic digestion are technologies capable of achieving high reactor productivity. The high organic load admissible for this type of configuration makes these technologies an ideal ally in the conversion of waste into bioenergy. However, there are still several factors associated with these technologies that result in low performance. The economic model based on a linear approach is unsustainable, and changes leading to the development of a low-carbon model with a high degree of circularity are necessary. Digestion technology may represent a key driver leading these changes but it is undeniable that the profitability of these plants needs to be increased. In the present review, the digestion process under high-solid-content configurations is analyzed and the different strategies for increasing reactor productivity that have been studied in recent years are described. Percolating reactor configurations and the use of low-cost adsorbents, nanoparticles and micro-aeration seem the most suitable approaches to increase volumetric production and reduce initial capital investment costs.

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High-solids thermophilic anaerobic digestion of sewage sludge: effect of ammonia concentration

Cited by 16 publications

References 24 publications

Performance improvement and decolourization in the high‐solid thermophilic anaerobic digestion of thermally pretreated sewage sludge

Performance improvement and decolourization in the high‐solid thermophilic anaerobic digestion of thermally pretreated sewage sludge

Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

High-Solid Anaerobic Digestion: Reviewing Strategies for Increasing Reactor Performance

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