Removal of heavy metal ions by ultrafiltration with recovery of extracellular polymer substances from excess sludge

Cao, Da-Qi; Wang, Xin; Fang, Xiaomin; Jin, Jingyi; Hao, Xiaodi; Iritani, Eiji; Katagiri, Nobuyuki

doi:10.1016/j.memsci.2020.118103

Cited by 50 publications

(32 citation statements)

References 58 publications

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“…The adsorption capacity of the column was calculated using eqn (10) and (11), and the efficiency of the column was calculated using eqn (12).…”

Section: Column Studiesmentioning

confidence: 99%

“…The Thomas model is used to predict the adsorption curve in the xed-bed column under different operational conditions. The linear form of the Thomas model is described in eqn (10) and Fig. 9b shows the graphical t to the Thomas model.…”

Section: Column Studiesmentioning

confidence: 99%

“…Lead can cause damage to the central nervous system, kidneys, liver and reproductive system, as well as to basic cellular processes and brain functions. [8][9][10] Therefore, eradicating these metal pollutants from water is of the utmost importance. 11 Various technologies have been applied to the treatment of water contaminated with heavy metals.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogels derived from galactoglucomannan hemicellulose with inorganic contaminant removal properties

Encina

Elgueta²,

Rivas

et al. 2021

RSC Adv.

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“…The adsorption capacity of the column was calculated using eqn (10) and (11), and the efficiency of the column was calculated using eqn (12).…”

Section: Column Studiesmentioning

confidence: 99%

Section: Column Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrogels derived from galactoglucomannan hemicellulose with inorganic contaminant removal properties

Encina

Elgueta²,

Rivas

et al. 2021

RSC Adv.

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show abstract

“…In this context, the discharge of HMIs from aqueous solutions has been intensively carried out using various processes, including chemical precipitation, extraction with different solvents, flocculation, ion exchange, ultrafiltration, reverse osmosis and adsorption [5][6][7][8][9][10]. Among these, adsorption is considered a simple and efficient technique to remove HMIs from wastewaters [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Copper(II), Cobalt(II) and Iron(III) Sorption in Binary and Ternary Systems by Chitosan-Based Composite Sponges Obtained by Ice-Segregation Approach

Dinu¹,

Humelnicu

Lazăr³

2021

Gels

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With the intensive industrial activity worldwide, water pollution by heavy metal ions (HMIs) has become a serious issue that requires strict and careful monitoring, as they are extremely toxic and can cause serious hazards to the environment and human health. Thus, the effective and efficient removal of HMIs still remains a challenge that needs to be solved. In this context, copper(II), cobalt(II) and iron(III) sorption by chitosan (CS)-based composite sponges was systematically investigated in binary and ternary systems. The composites sponges, formed into beads, consisting of ethylenediaminetetraacetic acid (EDTA)- or diethylenetriaminepentaacetic acid (DTPA)-functionalized CS, entrapping a natural zeolite (Z), were prepared through an ice-segregation technique. The HMI sorption performance of these cryogenically structured composite materials was assessed through batch experiments. The HMI sorption capacities of CSZ-EDTA and CSZ-DTPA composite sponges were compared to those of unmodified sorbents. The Fe(III) ions were mainly taken up when they were in two-component mixtures with Co(II) ions at pH 4, whereas Cu(II) ions were preferred when they were in two-component mixtures with Co(II) ions at pH 6. The recycling studies indicated almost unchanged removal efficiency for all CS-based composite sorbents even after the fifth cycle of sorption/desorption, supporting their remarkable chemical stability and recommending them for the treatment of HMI-containing wastewaters.

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“…EPS are products of microbial secretions, typically comprising polysaccharides, and proteins. These biopolymers have functional groups such as carboxyl, hydroxyl, phosphate, and amine groups, which enables them to retain ERM ( Ajao et al, 2020 ; Cao et al, 2020 ). Due to the ability of metal sorption, EPS can mitigate toxicity toward microorganisms by coordination reactions between metals and EPS ligands at low metal concentrations (mg L –1 range), even preventing their diffusion into the deeper parts of biofilms ( Sudmalis et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Metal-Pseudomonas veronii 2E Interactions as Strategies for Innovative Process Developments in Environmental Biotechnology

et al. 2021

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The increase of industrial discharges is the first cause of the contamination of water bodies. The bacterial survival strategies contribute to the equilibrium restoration of ecosystems being useful tools for the development of innovative environmental biotechnologies. The aim of this work was to study the Cu(II) and Cd(II) biosensing, removal and recovery, mediated by whole cells, exopolymeric substances (EPS) and biosurfactants of the indigenous and non-pathogenic Pseudomonas veronii 2E to be applied in the development of wastewater biotreatments. An electrochemical biosensor was developed using P. veronii 2E biosorption mechanism mediated by the cell surface associated to bound exopolymeric substances. A Carbon Paste Electrode modified with P. veronii 2E (CPEM) was built using mineral oil, pre-washed graphite power and 24 h-dried cells. For Cd(II) quantification the CPEM was immersed in Cd(II) (1–25 μM), detected by Square Wave Voltammetry. A similar procedure was used for 1–50 μM Cu(II). Regarding Cd(II), removal mediated by immobilized EPS was tested in a 50 ml bioreactor with 0.13 mM Cd(II), pH 7.5. A 54% metal retention by EPS was achieved after 7 h of continuous operation, while a 40% was removed by a control resin. In addition, surfactants produced by P. veronii 2E were studied for recovery of Cd(II) adsorbed on diatomite, obtaining a 36% desorption efficiency at pH 6.5. Cu(II) adsorption from a 1 mM solution was tested using P. veronii 2E purified soluble EPS in 50 mL- batch reactors (pH = 5.5, 32°C). An 80% of the initial Cu(II) was retained using 1.04 g immobilized EPS. Focusing on metal recovery, Cu nanoparticles (NPs) biosynthesis by P. veronii 2E was carried out in Cu(II)-PYG Broth at 25°C for 5 days. Extracellular CuNPs were characterized by UV-Vis spectral analysis while both extracellular and intracellular NPs were analyzed by SEM and TEM techniques. Responses of P. veronii 2E and its products as biosurfactants, bound and soluble EPS allowed Cu(II) and Cd(II) removal, recovery and biosensing resulting in a multiple and versatile tool for sustainable wastewater biotreatments.

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Removal of heavy metal ions by ultrafiltration with recovery of extracellular polymer substances from excess sludge

Cited by 50 publications

References 58 publications

Hydrogels derived from galactoglucomannan hemicellulose with inorganic contaminant removal properties

Hydrogels derived from galactoglucomannan hemicellulose with inorganic contaminant removal properties

Analysis of Copper(II), Cobalt(II) and Iron(III) Sorption in Binary and Ternary Systems by Chitosan-Based Composite Sponges Obtained by Ice-Segregation Approach

Metal-Pseudomonas veronii 2E Interactions as Strategies for Innovative Process Developments in Environmental Biotechnology

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