Digestate mechanical separation in industrial conditions: Efficiency profiles and fertilising potential

Chuda, Aleksandra; Ziemiński, Krzysztof

doi:10.1016/j.wasman.2021.04.049

Cited by 19 publications

(8 citation statements)

References 42 publications

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“…Also, the range of tested PAC dosages (i.e., 1.8-3.6 g/L) was almost half than that tested in a similar study involving digested chicken slurry (i.e., 6-24 g/L) [19]. On contrary, tested DEED and PAM dosages are similar to those used in the wastewater sector and, solely for the use of PAM on digestates, to what reported in the scientific literature [19,30]. According to 2020 market pricing, the cost of the chemicals used for the 3 best-performing treatments would be around 6 €/m 3 and 40 €/m 3 of unseparated digestate, respectively for PAC4 and PACDE5-PACDE6.…”

Section: Tss Mitigationmentioning

confidence: 61%

“…Here, bench-scale centrifugation was used as a simplified model of a decanter centrifuge. In particular, the values used for RCF and related rpm were chosen to simulate typical values of full-scale centrifugation applied to digestates [30][31][32]. Also, a residence time of 600 s, as used in this work, proved to be efficient for dry matter and phosphorous separation in lab-scale centrifugation of pig and cattle manure [14].…”

Section: Lab-scale Ces Performancementioning

confidence: 99%

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Chemically Enhanced Solid–Liquid Separation of Digestate: Suspended Solids Removal and Effects on Environmental Quality of Separated Fractions

Beggio

Peng

Lü

et al. 2021

Waste Biomass Valor

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Chemically enhanced solid–liquid separation (CES) of digestate can improve its membrane filterability but potentially influence the environmental features of the separated solid fraction, thus hindering its possible agricultural reuse. In this study, the effects were assessed of different dosages of polyaluminum chloride (PAC), epichlorohydrine-dimethylamine with ethylendiamine (DEED) and polyacrilamides (PAM) on CES of digestate from biowaste in terms of Total Suspended Solid (TSS) mitigation in the liquid fractions and resulting environmental quality of the solid fractions. Results from lab-scale trials showed that applied chemicals significantly increased the centrifugation efficiency with achieving minimum TSS concentration of 2347 ± 281 mgTSS/L (up to 90% improved TSS mitigation). Also, performed treatments led to almost complete removal of P and Heavy Metals (HMs) from the liquid fractions after centrifugation. Conditioned solid fractions showed higher Al (reaching 20 g kg−1 TS), organic carbon and nitrogen content (up to 324 mgTOC kg−1 TS and 44.1 mgTKN kg−1 TS, respectively) due to residual PAC, DEED and PAM. However, achieved concentrations of HMs guaranteed full consistency with EU regulation limits established for agricultural reuse of organic soil amendments. Further, leaching tests performed on the treated solid fractions indicate higher chlorides and soluble Al concentrations in the water extracts (up to 4.6 g L−1 and 2.3 g L−1, respectively), but lower HMs leachability from the digestates undergone CES. Nevertheless, water extracts from treated biosolids were characterized by higher phytotoxicity, likely related with direct Al toxicity and increased salinity due to chemicals addition. Accordingly, the effects on soil–plant system should be better investigated when agricultural reuse of CES-treated solid fraction of digestate is foreseen. Graphic abstract

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Section: Tss Mitigationmentioning

confidence: 61%

Section: Lab-scale Ces Performancementioning

confidence: 99%

Chemically Enhanced Solid–Liquid Separation of Digestate: Suspended Solids Removal and Effects on Environmental Quality of Separated Fractions

Beggio

Peng

Lü

et al. 2021

Waste Biomass Valor

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“…In addition, there are cases were standard processes are combined which results in increased efficiency. For example, Chuda and Ziemiński (2021) reported increased efficiency with coupled decanter centrifugation and flocculation.…”

Section: Valorization and Post-treatmentmentioning

confidence: 99%

“…Currently, the most well-known method to exploit digestate is to be used for fertilising purposes (Chuda and Ziemiński, 2021; Guilayn et al, 2019). The content of heavy metals, pathogens and the substrates used as feedstock affect the fertilising value (Tampio et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

A review of advances in valorization and post-treatment of anaerobic digestion liquid fraction effluent

Sfetsas¹,

Patsatzis²,

Chioti³

et al. 2022

Waste Manag Res

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Traditionally, digestate is considered a waste, which is used as fertiliser in the agriculture industry. Recent studies focus on increasing the profitability of digestate by extracting reusable nutrients to promote biogas plants cost-effectiveness, sustainable management and circular economy. This review focuses on the post-treatment and valorization of liquor which is produced by solid–liquid fractioning of digestate. Nutrient recovery and removal from liquor are possible through mechanical, physicochemical and biological procedures. The processes discussed involve complex procedures that differ in economic value, feasibility, legislative restrictions and performance. The parameters that should be considered to employ these techniques are influenced by liquor characteristics, topography, climate conditions and available resources. These are key parameters to keep in mind during designing and manufacturing a biogas plant. In the following chapters, a discussion on available liquor treatment methods takes place. The present study examines the critical aspects of the available liquor treatment methods.

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“…The first step in such a process is typically mechanical separation into a solid and liquid fraction [5]. Separation technologies allow better digestate management but do not change the total amount of nitrogen in the liquid fraction [7,8]. The treatment of the digestate liquid fraction can be performed by ammonia stripping, membrane filtration, evapo-concentration, or drying [5,6,9].…”

Section: Introductionmentioning

confidence: 99%

Challenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process

Chuda¹,

Ziemiński²

2021

Energies

Self Cite

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Even thoughdigestate, which is continually generated in anaerobic digestion process, can only be used as fertilizer during the growing season, digestate treatment is still a critical, environmental problem. That is why the present work aims to develop a method to manage digestate in agricultural biogas plant in periods when its use as fertilizer is not possible. A lab-scale system for the biological treatment of the digestate liquid fraction using the activated sludge method with a separate denitrification chamber was constructed and tested. The nitrogen load that was added tothe digestate liquid fraction accounted for 78.53% of the total nitrogen load fed into the reactor. External carbon sources, such as acetic acid, as well as flume water and molasses, i.e., wastewater and by-products from a sugar factory, were used to support the denitrification process. The best results were obtained using an acetic acid and COD (Chemical Oxygen Demand)/NO3–N (Nitrate Nitrogen) ratio of 7.5. The removal efficiency of TN (Total Nitrogen), NH4–N (Ammonia Nitrogen) and COD was 83.73%, 99.94%, 86.26%, respectively. It was interesting to see results obtained that were similar to those obtained when using flume water and COD/NO3–N at a ratio of 8.7. This indicates that flume water can be used as an alternative carbon source to intensify biological nitrogen removal from digestate.

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Digestate mechanical separation in industrial conditions: Efficiency profiles and fertilising potential

Cited by 19 publications

References 42 publications

Chemically Enhanced Solid–Liquid Separation of Digestate: Suspended Solids Removal and Effects on Environmental Quality of Separated Fractions

Chemically Enhanced Solid–Liquid Separation of Digestate: Suspended Solids Removal and Effects on Environmental Quality of Separated Fractions

A review of advances in valorization and post-treatment of anaerobic digestion liquid fraction effluent

Challenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process

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