Enhancing extraction of alginate like extracellular polymers (ALE) from flocculent sludge by surfactants

Li, Ji; Hao, Xiaodi; Gan, Wei; Loosdrecht, Mark C.M. van; Wu, Yuanyuan

doi:10.1016/j.scitotenv.2022.155673

Cited by 8 publications

(7 citation statements)

References 48 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: 89%

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: 89%

Biopolymers recovery from biological sludge and its use as phosphorus biosorbent

Cabral,

Gommersbach,

Cavali

et al. 2024

Eng. Sanit. Ambient.

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“…The concentrations of polysaccharide (PS) were measured using the phenol-sulfuric acid method using glucose as a standard, and the proteins were analyzed by the modified Lowry method with bovine serum albumin used as the standard. The purity of extracted ALEs was determined by the phenol-sulfuric acid assay and the commercial alginate (analytical reagent) was used as the standard at varying concentrations to create a standard curve [14]. The surface functional groups of ALE were identified by a Thermo Scientific K-Alpha + XPS system (ThermoFisher Scientific Inc., Waltham, MA, USA).…”

Section: Methodsmentioning

confidence: 99%

“…Numerous studies have shown that the relative quantity of EPS in conventional activated sludge (CAS) was lower than that of AGS. A recent study demonstrated that the ALE derived from CAS ranged from 90 to 190 mg/g VSS, which is lower than AGS with 200-350 mg/g VSS [14]. However, the total amount of CAS is huge, and the absolute content of ALE in CAS is of great value.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the ALE recovered from CAS is limited mainly due to the intrinsic low content and also the low efficiency with existing extraction methods. In addition, the other disadvantage of previous methods is that the economic value of extracted ALE is low [14]. Innovatively, Lin et al [11,15] proposed an efficient heating-Na 2 CO 3 method for ALE extraction from AGS, which was inspired by the extraction strategy of alginate from seaweed.…”

Section: Introductionmentioning

confidence: 99%

“…As for CAS, a few strategies were proposed to improve the extraction efficiency of ALE. It was reported that the addition of surfactants based on the heating-Na 2 CO 3 method improved the ALE extraction efficiency by 79.5-127.2% [14]. Sodium percarbonate (SPC, Na 2 CO 3 •1.5H 2 O 2 ), also known as solid hydrogen peroxide, is an effective, harmless, and economical oxidant.…”

Section: Introductionmentioning

confidence: 99%

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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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Recycling alginate-like extracellular polymers (ALE) from municipal sludge: Value-added products and external impact

Cheng,

Shi,

Zhao

et al. 2024

Chemical Engineering Journal

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Enhancing extraction of alginate like extracellular polymers (ALE) from flocculent sludge by surfactants

Cited by 8 publications

References 48 publications

Biopolymers recovery from biological sludge and its use as phosphorus biosorbent

Biopolymers recovery from biological sludge and its use as phosphorus biosorbent

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

Recycling alginate-like extracellular polymers (ALE) from municipal sludge: Value-added products and external impact

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