Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate

Gienau, Tobias; Ehrmanntraut, Artjom; Kraume, Matthias; Rosenberger, S.

doi:10.3390/membranes10040064

Cited by 9 publications

(4 citation statements)

References 24 publications

(43 reference statements)

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“…In this way the process of purification of the liquid fraction of the digestate could be economically feasible resulted in the obtaining of several different products: an organic N-P-fertilizer (solid digestate), a recirculate (UF retentate), a liquid N-K-fertilizer (RO retentate) and water. Ozone treatment doesn't have any negative effect on the nutrient content of the digestate which also confirmed a study by [Gienau et al, 2020].…”

Section: Investigation Of the Dewatering Technologies Of The Digestatesupporting

confidence: 87%

Technologies for Environmental Safety Application of Digestate as Biofertilizer

Ablіeіeva¹,

Berezhna²,

Berezhnyi³

et al. 2022

Ecol. Eng. Environ. Technol.

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The purpose of the paper is to determine the environmentally safe and economically feasible technology of biofertilizer production from the digestate including dewatering process. Methodological basis is based on the systematic approach to the determination of factors effected on the distribution of nutrients and pollutants between liquid and solid fractions after digestate separation. We studied modern technologies aimed at dewatering the digestate and reduction of its volume, showed their effectiveness. These technologies allow expanding the opportunities for commercialization of the digestate, increasing the cost of its transportation and application to the soil instead of complex fertilizers, using some valuable products. The results of the study showed that the ecological quality of the digestate is the highest as well as co-digested thermally pre-treated feedstock is used for solid-liquid separation in centrifuge with polymer addition as post-treatment approach to the flocculation. In order to increase efficiency of biofertilizer application the technological scheme of production process of granular fertilizers from digestate was proposed. Special feature of this scheme is in the use of phosphogypsum binder for the production of organomineral fertilizer that contributes phosphogypsum recycling in the waste management system.

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Section: Investigation Of the Dewatering Technologies Of The Digestatesupporting

confidence: 87%

Technologies for Environmental Safety Application of Digestate as Biofertilizer

Ablіeіeva¹,

Berezhna²,

Berezhnyi³

et al. 2022

Ecol. Eng. Environ. Technol.

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“…The high CFV can enhance mass transfer phenomena and mitigate membrane fouling, but this leads to high operation costs and limits the economical application. In order to reduce the CFV requirement, Tobias et al [ 35 ] used ozone to pretreat anaerobic digestate, and they found that UF flux could be improved by 50–80% by ozonation. Ozone treatment reduced the biopolymer concentration and apparent viscosity.…”

Section: Resultsmentioning

confidence: 99%

Direct Purification of Digestate Using Ultrafiltration Membranes: Influence of Pore Size on Filtration Behavior and Fouling Characteristics

et al. 2021

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Ultrafiltration (UF) can effectively remove large particles, suspended solids, and colloidal substances from anaerobic digestate. However, membrane fouling is a technical challenge in the purification of the digestate by UF. In this study, polyethersulfone (PES) membranes with four pore sizes (50.0, 20.0, 10.0 and 5.0 kDa) were employed to filter anaerobic digestate from swine manure. The effects of temperature, transmembrane pressure (TMP), and cross-flow velocity (CFV) on flux were investigated. The purification effects and fouling characteristics of the four membranes were analyzed. The results revealed that the increase of temperature and CFV can effectively promote UF separation efficiency, but as the TMP exceeded 3.0 bar, the flux increase rates of the four membranes were almost zero. The larger membrane pore size caused the faster flux increase with the increase in pressure. During the batch experiment, the 20.0 kDa membrane showed the lowest flux maintenance ability, while the 5.0 kDa showed the highest ability due to the smaller pore size. All four membranes can effectively remove tetracyclines residues. Elements C, O, and S were the major membrane foulant elements. The dominant bacteria orders of membrane fouling were Pseudomonadales, Xanthomonadales and Burkholderiales. Compared with tap water and citric acid, the membrane cleaning by NaOH and NaClO showed higher flux recovery rates. The 50.0 kDa membrane achieved the best cleaning effects under all cleaning methods.

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“…Currently, new technologies for processing liquid fractions of digestates are still being explored [17]. One of the possibilities is through nutrient recovery such as struvite (STR) precipitation [18] and ammonia stripping (to produce ammonium sulphate (AS)) [6,[19][20][21], combined ozone treatment and ultrafiltration [22], combined system with aerobic granular sludge batch reactors and ultrafiltration [23], or utilizing fly ash as a chemical precipitant [24].…”

Section: Introductionmentioning

confidence: 99%

Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions

et al. 2021

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Fast development of centralized agricultural biogas plants leads to high amounts of digestate production. The treatment and disposal of liquid fractions after on-site digestate solid–liquid separation remains problematic due to their high organic, nutrient and aromatic contents. This work aims to study the variability of the remaining compounds in the digestate liquid fractions in relation to substrate origin, process parameters and solid–liquid separation techniques. Twenty-nine digestates from full-scale codigestion biogas plants and one waste activated sludge (WAS) digestate were collected and characterized. This study highlighted the combined effect of the solid–liquid separation process and the anaerobic digestion feedstock on the characteristics of liquid fractions of digestates. Two major clusters were found: (1) liquid fractions from high efficiency separation process equipment (e.g., centrifuge and others with addition of coagulant, flocculent or polymer) and (2) liquid fractions from low efficiency separation processes (e.g., screw press, vibrating screen and rotary drum), in this latter case, the concentration of chemical oxygen demand (COD) was associated with the proportion of cow manure and energy crops at biogas plant input. Finally, SUVA254, an indicator for aromatic molecule content and the stabilization of organic matter, was associated with the hydraulic retention time (HRT).

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Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate

Cited by 9 publications

References 24 publications

Technologies for Environmental Safety Application of Digestate as Biofertilizer

Technologies for Environmental Safety Application of Digestate as Biofertilizer

Direct Purification of Digestate Using Ultrafiltration Membranes: Influence of Pore Size on Filtration Behavior and Fouling Characteristics

Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions

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