Centrifugation of Digestate: The Effect of Chitosan on Separation Efficiency

Popovic, Olga; Gioelli, F.; Dinuccio, Elio; Rolle, Luca Giorgio Carlo; Balsari, P.

doi:10.3390/su9122302

Cited by 11 publications

(6 citation statements)

References 20 publications

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“…In particular, the mechanical separation is less capable of removing total K and NO 3 − as they appeared higher in content in LD sep 1.04 g/kg and 9.81 mg/kg compared to SFD sep 0.43 g/kg and 7.82 mg/kg, respectively. These findings are in agreement with those of a study by Popovic et al, who found that the separation efficiency can be enhanced by the addition of flocculants [33]. In the case of macronutrients Ca, Mg, S, and total N, mechanical separation with sieves (SFD sep ) was more effective for their transfer to the solid digestate in contrast to centrifugal separation (SFD dec ), which showed a better efficacy for Na, total P, and total K. Concerning trace elements and heavy metals, Hg, Cu, and B were better transferred to solid digestate using mechanical separation contrary to centrifugation, but the application of chitosan could increase centrifugation efficiency according to the results of Popovic et al [33].…”

Section: Evaluation Of Datasupporting

confidence: 94%

Fractionation of Anaerobic Digestion Liquid Effluents through Mechanical Treatment and Filtration

Sfetsas,

Sarikaki,

Chioti

et al. 2023

Sustainability

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Organic wastes and by-products from several activities, including food industries, farming, and animal husbandry, are a hygiene threat when aerobically decomposed. Therefore, their management is crucial for public health. In this direction, anaerobic digestion (AD) systems may be the solution by transforming waste into energy, which may decrease the environmental impact. However, their efficacy should be carefully examined. In this innovative study, we evaluated the physicochemical and microbial characteristics of liquid digestate (LD) retrieved from organic animal wastes in northern Greece using nanofiltration. Using treatment technologies, including physical (solid–liquid separation, microfiltration, and nanofiltration) and biological (anaerobic digestion), heavy metals and microbial (i.e., Salmonella spp., Escherichia coli, and Enterococcus faecalis) concentrations were reduced and nutrients were recovered. This work sets the basis for the efficient management of liquid digestate. Our method may enable the use of treated liquid digestate for unlimited irrigation water and other industrial applications of water. Apart from the sanitation process, the recovery of nutrients for soil fertilization seems to be a more sustainable way for future agricultural practices.

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Section: Evaluation Of Datasupporting

confidence: 94%

Fractionation of Anaerobic Digestion Liquid Effluents through Mechanical Treatment and Filtration

Sfetsas,

Sarikaki,

Chioti

et al. 2023

Sustainability

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“…To intensify this process flocculation can be used based on the addition of different chemicals capable to increase the sizes of particles, which form flocs and increase floc resistance to further mechanical separation. The addition of chitosan as a new type of flocculent followed by centrifugation produced 27% solid fraction (8.8% dry matter) that improved centrifugation efficiency for K, Cu, and Zn and had no effect on total N or P [Popovic et al, 2017].…”

Section: Investigation Of the Dewatering Technologies Of The Digestatementioning

confidence: 99%

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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“…Therefore, chitosan is one of the most promising natural flocculants. Moreover, chitosan can form complexes with metallic ions [74]. Some studies explored the combined application of natural and synthetic chemicals in CEPT.…”

Section: Flocculants Used In Ceptmentioning

confidence: 99%

Revisiting Chemically Enhanced Primary Treatment of Wastewater: A Review

Shewa

Dagnew

2020

Sustainability

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Chemically enhanced primary treatment (CEPT) is a process that uses coagulant and/or flocculant chemicals to remove suspended solids, organic carbon, and nutrients from wastewater. Although it is not a new technology, it has received much attention in recent years due to its increased treatment capacity and related benefits compared to the conventional primary treatment process. CEPT involves both physical and chemical processes. Alum and iron salts are the commonly used coagulants in CEPT. Several types of anionic, cationic, and uncharged polymers are used as flocculants, where poly aluminum chloride (PACL) and polyacrylamide (PAM) are the widely used ones. Some of the coagulants and flocculants used may have inhibitory and/or toxicity effects on downstream treatment and recovery processes. There has been an increasing amount of work on the treatment of wastewaters from various sources using CEPT. These wastewaters can range from municipal/domestic wastewater, combined sewer overflow, landfill leachate, cattle manure digestate to wastewaters from textile industry, pulp and paper mill, slaughterhouse, milk processing plant, tannery and others. In recent cases, CEPT is employed to enhance carbon redirection for recovery and substantially reduce the organic load to secondary treatment processes. CEPTs can remove between 43.1–95.6% of COD, 70.0–99.5% suspended solids, and 40.0–99.3% of phosphate depending on the characteristics of wastewater treated and type of coagulants and/or flocculants used. This article reviews the application, chemicals used so far, removal efficiencies, challenges, and environmental impacts of CEPT.

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Centrifugation of Digestate: The Effect of Chitosan on Separation Efficiency

Cited by 11 publications

References 20 publications

Fractionation of Anaerobic Digestion Liquid Effluents through Mechanical Treatment and Filtration

Fractionation of Anaerobic Digestion Liquid Effluents through Mechanical Treatment and Filtration

Technologies for Environmental Safety Application of Digestate as Biofertilizer

Revisiting Chemically Enhanced Primary Treatment of Wastewater: A Review

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