A review on recovery of extracellular biopolymers from flocculent and granular activated sludges: Cognition, key influencing factors, applications, and challenges

Chen, Xingyu; Lee, Yu-Jen; Yuan, Tian; Lei, Zhongfang; Adachi, Yasuhisa; Zhang, Zhenya; Lin, Yuemei; Loosdrecht, Mark C.M. van

doi:10.1016/j.biortech.2022.127854

Cited by 30 publications

(8 citation statements)

References 70 publications

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“…It is worthwhile that each reported study used a different operational condition and influent composition. Li et al (2022), apud Chen et al (2022), reported ALE recovery rates up to 300 mgVS ALE •mgVS sludge , which were achieved using synthetic effluent containing starch with adjustments to temperature and the C:N ratio, while in this study real wastewater without temperature control was used. Some key factors influencing ALE production are the SBR cycle steps, organic loading rate, sludge discharge, shear stress, temperature, microbial diversity, influent C:N ratio, salinity and cations (CHEN et al, 2022).…”

Section: Yield Of Alginate-like Exopolymer Extraction From Activated ...mentioning

confidence: 90%

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Biopolymers recovery from biological sludge and its use as phosphorus biosorbent

Cabral,

Gommersbach,

Cavali

et al. 2024

Eng. Sanit. Ambient.

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Biopolymers can be recovered from aerobic sludge and used for environmental applications, such as phosphorus adsorbent material, instead being sent to sanitary landfills. In this resource recovery perspective, this work aimed to study the recovery of alginate-like exopolymer (ALE) from activated sludge (AS) compared to aerobic granular sludge (AGS). ALE-based biosorbent was prepared and tested to remove phosphorus from aqueous solutions, and the adsorption kinetics and isotherm models were studied. The recovery yield of ALE from a full-scale wastewater treatment plant (WWTP) AS (18.7%) was close to that obtained from a pilot-scale AGS (22%). ALE recovered from AS presented hydrogel properties and humic substances in its composition, which are important features for future applications. The equilibrium of the adsorption was reached after 10 minutes. The Langmuir isotherm model and the PFO kinetic model best fitted to the experimental data, resulting in maximum adsorption capacity of 8.164 mgP·gALE. Thus, ALE recovered from AS has the potential to be used as a phosphorus biosorbent from effluents and further used as a nutrient delivery system with hydrogel properties.

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Section: Yield Of Alginate-like Exopolymer Extraction From Activated ...mentioning

confidence: 90%

“…According to Schambeck et al (2020a), ALE extraction from AGS yielded approximately 236 ± 27 mg(ALE)•g(sludge), and the biopolymer exhibited relevant properties for industrial use. In addition, Chen et al (2022) reviewed the ALE recovery yields from AS, indicating recovery efficiencies of up to 300 mg(ALE)•g(sludge).…”

Section: Introductionmentioning

confidence: 99%

Biopolymers recovery from biological sludge and its use as phosphorus biosorbent

Cabral,

Gommersbach,

Cavali

et al. 2024

Eng. Sanit. Ambient.

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“…ALP production was highest when a lab-scale AGS reactor was operated with a short anoxic phase in the anaerobic/oxic/anoxic cycle and a short solid retention time of about 10 days 15 . Increasing the COD:N ratio increased the amount of ALP in the biomass, but when the ratio reached 30:1, ALP production decreased 11 . de Carvalho et al 16 indicate that the conditions for ALP production are most favorable in reactors with mature AGS that are operated with a variable organic load, a long sludge retention time (up to 20 days), a COD/N ratio of 20, and moderate salinity of the influent wastewater.…”

Section: Introductionmentioning

confidence: 95%

“…The extraction and recovery of ALP from AGS have attracted great interest. Currently, most extractions and purifications of ALP are performed with AGS, while fewer studies have investigated the recovery of ALP from activated sludge 11 . This is because the content of ALP is higher in AGS than in activated sludge 12 .…”

Section: Introductionmentioning

confidence: 99%

Alginate-like polymers from full-scale aerobic granular sludge: content, recovery, characterization, and application for cadmium adsorption

Cydzik‐Kwiatkowska

Gusiatin

Zielińska

et al. 2022

Sci Rep

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Aerobic granular sludge (AGS) is a proven resource for the recovery of biopolymers like alginate-like polymers (ALP). This is the first report on the dynamics of ALP produced by AGS (ALP-AGS) in a full-scale wastewater treatment plant (WWTP), optimization of ALP recovery from AGS, and adsorption of cadmium (Cd2+) by ALP. Recovery of ALP was highest when using 120 mL of 0.2 M Na2CO3 at 70 °C for 45 min. Seasonal (1.5 years, over 3100 cycles) and intra-cycle changes in ALP-AGS in the WWTP were monitored. The ALP content in AGS increased in the transition period between winter and spring, reaching over 150 mg/g MLSS. In the batch reactor cycle, the ALP-AGS level peaked 2 h after the start of aeration (mean peak level: 120 mg/g MLSS), then decreased about two-fold by the end of the cycle. The ALP-AGS had a small surface area and a lamellar structure with crystalline outgrowths. The optimal conditions of Cd2+ adsorption with ALP were a dosage of 7.9 g d.m./L, a pH of 4–8, and an equilibrium time of 60 min. Carboxyl and hydroxyl groups were the key functional groups involved in Cd2+ adsorption. According to the Sips model, the maximum Cd2+ adsorption capacity of ALP-AGS was 29.5 mg/g d.m., which is similar to that of commercial alginate. AGS is a richer source of ALP than activated sludge, which ensures the cost-effectiveness of ALP recovery and increases the sustainability of wastewater treatment. Information on the chemical properties and yields of ALP from full-scale WWTPs is important for downstream applications with the recovered ALP.

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“…EPS are mainly composed of a wide variety of biopolymers with a high molecular weight (including proteins, lipids, and polysaccharides), which comprise 60-80% of the sludge volume [5]; therefore, recovering biopolymers from sludge has become a current research hotspot and attracts considerable attention in various applications [6,7]. As a complex of natural biopolymers, EPS can not only maintain the stability of sludge structure but also protect cells from external environmental stress (including toxic substances and heavy metals) [8]. The biomacromolecules in the EPS matrix have unique properties, which are potentially high value-added and versatile bio-based materials [9].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Recovery of Alginate-like Extracellular Polymers (ALE) from Waste-Activated Sludge Using Sodium Percarbonate: Performance and Characteristics

Liu,

Ren,

Zhai

et al. 2023

Sustainability

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Resource recovery from waste-activated sludge is of great practical significance to achieve sustainable wastewater treatment. Alginate-like extracellular polymers (ALE), a typical class of extracellular polymer substances, are valuable bio-based products with broad application prospects. However, due to the low extraction efficiency of the current method, its practical applications are severely limited. In this study, sodium percarbonate (SPC) was first applied to enhance ALE extraction from conventional activated sludge to replace the sodium carbonate (SC) in the heating-SC method. The results showed that the ALE extracted by the heating-SPC method increased by 30.11% compared to the heating-SC method, and the alginate equivalent was slightly improved. Monosaccharide composition analysis showed that the ALE primarily comprised galactose and glucose, indicating the potential for biomedical applications. The particle size distribution and extracellular polymeric substances (EPS) composition of the sludge indicated that SPC could improve the cracking of the sludge flocs and the organic release. In addition, due to SPC’s ability to oxidize, the molecular composition of the ALE extract changed. In conclusion, SPC used as a substitute for SC in the heating-SC method could be effectively employed to recover ALE from waste-activated sludge. In future studies, further optimization of the operational conditions needs to be considered.

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A review on recovery of extracellular biopolymers from flocculent and granular activated sludges: Cognition, key influencing factors, applications, and challenges

Cited by 30 publications

References 70 publications

Biopolymers recovery from biological sludge and its use as phosphorus biosorbent

Biopolymers recovery from biological sludge and its use as phosphorus biosorbent

Alginate-like polymers from full-scale aerobic granular sludge: content, recovery, characterization, and application for cadmium adsorption

Enhanced Recovery of Alginate-like Extracellular Polymers (ALE) from Waste-Activated Sludge Using Sodium Percarbonate: Performance and Characteristics

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