Magnetic sludge byproducts for adsorptive phosphorus removal: Resource recovery from iron-based anaerobic sewage sludge

Ahmed, Muniruddin; Aziziha, Mina; Anwar, Rifat; Johnson, Matthew B.; Lin, Lian-Shin

doi:10.1016/j.wasman.2020.11.050

Cited by 10 publications

(6 citation statements)

References 71 publications

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“…The reason is that the negative charge generated on the surface due to the deprotonation of Ca-MSBC in the strong alkali medium and the electrostatic repulsion between the phosphate anions resulted in a small decrease in the phosphate adsorption capacity [47]. Comparing the results of the S3 study, the adsorbent showed superior phosphate adsorption capacity under alkaline conditions compared to other similar biomass-derived biochar [48][49][50][51]. As shown in Figure 5B, the pore size of Ca-MSBC before and after adsorption is mainly distributed between 20 and 40 nm, and Table S2 shows that the average pore size is 18-19 nm, which proves again that Ca-MSBC is dominated by a mesoporous structure.…”

Section: Effect Of Adsorption Conditions On the Phosphorus Removal Pe...mentioning

confidence: 94%

Phosphate Removal by Ca-Modified Magnetic Sludge Biochar Prepared by a One-Step Hydrothermal Method

Liu,

Li,

Zhou

et al. 2023

Catalysts

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The problem of phosphorus pollution and its resource utilization has been a source of general concern. The preparation of green, renewable, and non-secondary pollution adsorbents has become a research direction. In this paper, a one-step hydrothermal preparation method of Ca-modified magnetic sludge biochar (Ca-MSBC) is used for enhancing phosphate removal. The results show that the adsorption rate of phosphate by Ca-MSBC is mainly controlled by chemisorption but is also related to physical adsorption and an internal diffusion mechanism. The maximum phosphorus adsorption capacity of Ca-MSBC was 89.25 mg g−1 at 343 K (initial phosphate concentration 500 mg L−1). After nine cycles of adsorption experiments, the adsorption capacity of 70.16 mg g−1 was still high. In addition, coexisting ions Cl−, NO3−, SO42−, and CO32− have no significant effect on the adsorption properties of phosphate. XRD, FT-IR, VSM, XPS, and N2 adsorption/desorption isotherms showed that the mechanism of phosphate removal from water by Ca-MSBC was mainly the chemical precipitation reaction of phosphate and calcium. The results of this study indicate that Ca-MSBC has potential application and environmental value as a solid waste recycling material for environmental remediation.

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Section: Effect Of Adsorption Conditions On the Phosphorus Removal Pe...mentioning

confidence: 94%

Phosphate Removal by Ca-Modified Magnetic Sludge Biochar Prepared by a One-Step Hydrothermal Method

Liu,

Li,

Zhou

et al. 2023

Catalysts

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“…It is necessary to apply raw materials that are abundantly available in nature or produced as by-product and wastes in agro-industrial and other processes. Examples of low-cost feedstocks for the preparation of carbon-based materials include biomasses and urban wastes such as chestnut shell [25], rice straw [27], banana peel [31], pomelo peel [101], rubber tires [102], Tetra pak residues [55], and sewage sludge [103, 104]. AC, BC, and other carbon-based supports can be obtained from the processing of these wastes via thermal decomposition (e.g., via pyrolysis or HTC) to prepare suitable adsorbents.…”

Section: Synthesis Of Magnetic Carbon-based Adsorbentsmentioning

confidence: 99%

“…Herein, it should be pointed out that the compounds used to confer magnetic properties in an adsorbent can be also obtained from low cost materials such as urban and industrial wastes (e.g., sewage sludge) [104]. One illustrative example is the iron salts utilized in anaerobic biological wastewater treatment system [104] and chemical precipitation [106]. Sewage sludge contains high amounts of iron species that can be converted to iron oxides with both magnetic and adsorption properties [103, 104].…”

Section: Synthesis Of Magnetic Carbon-based Adsorbentsmentioning

confidence: 99%

“…One illustrative example is the iron salts utilized in anaerobic biological wastewater treatment system [104] and chemical precipitation [106]. Sewage sludge contains high amounts of iron species that can be converted to iron oxides with both magnetic and adsorption properties [103, 104]. For instance, a magnetic alkali-acid adsorbent was prepared via the pyrolysis of municipal sewage sludge (containing polyferric sulfate) for the tetracycline removal [103].…”

Section: Synthesis Of Magnetic Carbon-based Adsorbentsmentioning

confidence: 99%

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Engineered Magnetic Carbon-Based Adsorbents for the Removal of Water Priority Pollutants: An Overview

Reynel-Ávila

Camacho-Aguilar

Bonilla-Petriciolet

et al. 2021

Adsorption Science & Technology

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This review covers the preparation, characterization, and application of magnetic adsorbents obtained from carbon-based sources and their application in the adsorption of both inorganic and organic pollutants from water. Different preparation routes to obtain magnetic adsorbents from activated carbon, biochar, hydrochar, graphene, carbon dots, carbon nanotubes, and carbon nanocages, including the magnetic phase incorporated on the solid surface, are described and discussed. The performance of these adsorbents is analyzed for the removal of fluoride, arsenic, heavy metals, dyes, pesticides, pharmaceuticals, and other emerging and relevant water pollutants. Properties of these adsorbents and the corresponding adsorption mechanisms have been included in this review. Overall, this type of magnetic adsorbents offers an alternative for facing the operational problems associated to adsorption process in water treatment. However, some gaps have been identified in the proper physicochemical characterization of these adsorbents, the development of green and low-cost preparation methods for their industrial production and commercialization, the regeneration and final disposal of spent adsorbents, and their application in the multicomponent adsorption of water pollutants.

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“…These studies have led to further development of innovative iron-dosed treatment processes [ 12 , 13 , 14 ]. Iron-based anaerobic treatment has multiple energy and environmental benefits including no aeration requirement, potential use of iron containing wastes, design and operation simplicity, low sludge production and CO 2 emission, and potential resource recovery from the sludge materials [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Functional Interrelationships of Microorganisms in Iron-Based Anaerobic Wastewater Treatment

et al. 2021

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This study explicated the functional activities of microorganisms and their interrelationships under four previously reported iron reducing conditions to identify critical factors that governed the performance of these novel iron-dosed anaerobic biological wastewater treatment processes. Various iron-reducing bacteria (FeRB) and sulfate reducing bacteria (SRB) were identified as the predominant species that concurrently facilitated organics oxidation and the main contributors to removal of organics. The high organic contents of wastewater provided sufficient electron donors for active growth of both FeRB and SRB. In addition to the organic content, Fe (III) and sulfate concentrations (expressed by Fe/S ratio) were found to play a significant role in regulating the microbial abundance and functional activities. Various fermentative bacteria contributed to this FeRB-SRB synergy by fermenting larger organic compounds to smaller compounds, which were subsequently used by FeRB and SRB. Feammox (ferric reduction coupled to ammonium oxidation) bacterium was identified in the bioreactor fed with wastewater containing ammonium. Organic substrate level was a critical factor that regulated the competitive relationship between heterotrophic FeRB and Feammox bacteria. There were evidences that suggested a synergistic relationship between FeRB and nitrogen-fixing bacteria (NFB), where ferric iron and organics concentrations both promoted microbial activities of FeRB and NFB. A concept model was developed to illustrate the identified functional interrelationships and their governing factors for further development of the iron-based wastewater treatment systems.

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Magnetic sludge byproducts for adsorptive phosphorus removal: Resource recovery from iron-based anaerobic sewage sludge

Cited by 10 publications

References 71 publications

Phosphate Removal by Ca-Modified Magnetic Sludge Biochar Prepared by a One-Step Hydrothermal Method

Phosphate Removal by Ca-Modified Magnetic Sludge Biochar Prepared by a One-Step Hydrothermal Method

Engineered Magnetic Carbon-Based Adsorbents for the Removal of Water Priority Pollutants: An Overview

Functional Interrelationships of Microorganisms in Iron-Based Anaerobic Wastewater Treatment

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