Analysis of uncontrolled phosphorus precipitation in anaerobic digesters under thermophilic and mesophilic conditions

Ramírez, Javier Eduardo Sánchez; Cháfer, Amparo; Martí, N.; Claros, J.; Doñate, Silvia; Bouzas, A.

doi:10.1080/09593330.2019.1681522

Cited by 8 publications

(3 citation statements)

References 31 publications

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“…The increase in pH and the concentration of soluble components can raise the potential of struvite precipitation at higher temperatures. However, [48] showed slightly lower phosphorous, magnesium and calcium precipitation at thermophilic temperatures in comparison with mesophilic temperatures for digesters operated at an HRT of 20 days.…”

Section: Physicochemical Parametersmentioning

confidence: 87%

Exploring Anaerobic Digestion from Mesophilic to Thermophilic Temperatures—Operational and Microbial Aspects

Steiniger,

Hupfauf,

Insam

et al. 2023

Fermentation

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Digesters at water resource recovery facilities (WRRFs) operating at different temperatures within the mesophilic and thermophilic temperature range is a flexibilization concept to contribute to heat management. Four 25 L digesters were fed with sewage sludge from a municipal WRRF and were operated at 37, 43, 47 and 53 °C, respectively, to describe changes in the overall process performance and the microbiota. Specific methane yield and COD degradation rates were the highest at 47 °C, only being up to 7% higher compared with at 37 °C. The increase in pH and concentrations of NH4-N and PO4-P above 43 °C were statistically significant. The effect on the microbial community was strong, indicating both a constant specialization towards thermophilic organisms as well as a change from acetoclastic to hydrogenotrophic/methylotrophic methanogenesis. The influence of temperature on process-engineering and physicochemical aspects was rather small compared with the changes in the microbiota.

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Section: Physicochemical Parametersmentioning

confidence: 87%

Exploring Anaerobic Digestion from Mesophilic to Thermophilic Temperatures—Operational and Microbial Aspects

Steiniger,

Hupfauf,

Insam

et al. 2023

Fermentation

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“…On the other hand, when pretreatment was performed at 80 • C, production of the gases under analysis was negligible. The reason for such results is that bacteria in materials are highly active only in mesophilic ranges (between 25 and 42 • C) [65] and thermophilic ranges (between 50 and 65 • C) [66]. At temperatures below 15 • C and above 70 • C, methanogenic bacteria are limited in activity [67].…”

Section: Gas Phase Compositionmentioning

confidence: 99%

Determination of Various Parameters during Thermal and Biological Pretreatment of Waste Materials

et al. 2020

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Pretreatment of waste materials could help in more efficient waste management. Various pretreatment methods exist, each one having its own advantages and disadvantages. Moreover, a certain pretreatment technique might be efficient and economical for one feedstock while not for another. Thus, it is important to analyze how parameters change during pretreatment. In this study, two different pretreatment techniques were applied: thermal at lower and higher temperatures (38.6 °C and 80 °C) and biological, using cattle rumen fluid at ruminal temperature (≈38.6 °C). Two different feedstock materials were chosen: sewage sludge and riverbank grass (Typha latifolia), and their combinations (in a ratio of 1:1) were also analyzed. Various parameters were analyzed in the liquid phase before and after pretreatment, and in the gas phase after pretreatment. In the liquid phase, some of the parameters that are relevant to water quality were measured, while in the gas phase composition of biogas was measured. The results showed that most of the parameters significantly changed during pretreatments and that lower temperature thermal and/or biological treatment of grass and sludge is suggested for further applications.

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“…The biomass of digestate, the by-product of anaerobic digestion, is quantitatively similar to the inlet raw materials. Indeed, during anaerobic digestion, a fraction of organic carbon is transformed into methane (CH 4 ) and carbon dioxide (CO 2 ), whereas for most of the other elements, particularly nitrogen (N) and phosphorus (P), there is no material loss but rather a form change [2,3]. The N recovery in the digestate is close to 100%, whereas P, calcium (Ca), magnesium (Mg), and manganese (Mn) are partially crystallized in substituted phosphate form, which can be used as P fertilizer [4].…”

Section: Introductionmentioning

confidence: 99%

Digestate Liquid Fraction Treatment with Filters Filled with Recovery Materials

Piccoli

Virga

Maucieri

et al. 2020

Water

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Constructed wetlands (CWs) represent a green technology for digestate liquid fraction (DLF) treatment. However, previous research has warned about their performance when treating wastewater with high suspended solid and organic loads. In addition, the high NH4-N concentration typical of this wastewater can compromise vegetation establishment and activity. In view of this, a digestate pretreatment is needed. This study aimed to test the performance of filters filled with recovery materials, such as brick and refractory material, for DLF pretreatment. The effect on DLF physical (electrical conductivity, pH, dissolved oxygen, and temperature) and chemical (total nitrogen, ammonia–nitrogen, nitrate–nitrogen, total phosphorus, soluble phosphorus, and chemical oxygen demand) characteristics was monitored during eight weekly cycles. The effect of filtration on total nitrogen and ammonia–nitrogen removal began after about one month of loading, suggesting that an activation period is necessary for bacteria. For effective N removal, the presence of multiple digestate recirculations per day through the filters appears mandatory to guarantee the alternation of nitrification and denitrification conditions. For P removal, filling material particle size appeared to be more important than its composition. Unclear performances were observed considering chemical oxygen demand. Further studies on filling media and microbial community interactions, and the long-term efficiency of filters, are desirable.

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Analysis of uncontrolled phosphorus precipitation in anaerobic digesters under thermophilic and mesophilic conditions

Cited by 8 publications

References 31 publications

Exploring Anaerobic Digestion from Mesophilic to Thermophilic Temperatures—Operational and Microbial Aspects

Exploring Anaerobic Digestion from Mesophilic to Thermophilic Temperatures—Operational and Microbial Aspects

Determination of Various Parameters during Thermal and Biological Pretreatment of Waste Materials

Digestate Liquid Fraction Treatment with Filters Filled with Recovery Materials

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