Mechanisms of heavy-metal removal by activated sludge

Pagnanelli, Francesca; Mainelli, Sara; Bornoroni, L.; Dionisi, Davide; Toro, Luigi

doi:10.1016/j.chemosphere.2009.01.043

Cited by 93 publications

(58 citation statements)

References 33 publications

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“…Similar results were obtained by Koc et al, who indicated that leachate treatment by activated sludge decreased lead concentration (75%) but did not effect cadmium concentration [24]. Results of this study are approximately supported by Justyna et al [25] and Cecen et al [26], who reported that activated sludge had a high biosorption capacity and that equilibrium was reached in a short time with respect to copper, iron, manganese, zinc, and chromium, and manganese became very concentrated on activated sludge with time.…”

Section: Pb>mn>fe>zn>cu>mg>co>hg >Cr>ni>v>cdsupporting

confidence: 80%

Investigating Activated Sludge Microbial Population Efficiency in Heavy Metals Removal from Compost Leachate

Farrokhi¹,

Naimi-Joubani²,

Dargahi³

et al. 2018

Pol. J. Environ. Stud.

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Solid waste production has increased in recent years. Many studies have shown that generated leachate from solid waste contains a high concentration of heavy metals. Their removal efficiency from leachate was investigated in aerobic suspended and attached growth systems in lab-scale within 72 hours of aeration. All of the materials used were analytical grade (Merck). Maximum efficiency of the attached growth system in removal of BOD 5 and COD was, respectively, 80% and 78.28%. Maximum removal efficiency for both attached and suspended growth was related to lead, and minimum removal efficiency was related to vanadium for the attached growth, and cadmium for suspended growth. Heavy metals removal efficiencies in attached growth from max to min were lead, iron, manganese, cobalt, zinc, mercury, magnesium, copper, chromium, nickel, cadmium, and vanadium, respectively; and the removal efficiencies for suspended growth from max to min were lead, manganese, iron, zinc, copper, magnesium, cobalt, mercury, chromium, nickel, vanadium, and cadmium, respectively. Generally it can be concluded that both systems are suitable for young leachate treatment, but to satisfy environmental discharge standards post treatment will be necessary.

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Section: Pb>mn>fe>zn>cu>mg>co>hg >Cr>ni>v>cdsupporting

confidence: 80%

Investigating Activated Sludge Microbial Population Efficiency in Heavy Metals Removal from Compost Leachate

Farrokhi¹,

Naimi-Joubani²,

Dargahi³

et al. 2018

Pol. J. Environ. Stud.

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“…Using these values (Fe, Ni, Cu, Zn, Pb, Cd, and Cr) Removal (Q Me , mg/g VSS) can be calculated by the metal material balances in the reactor by equation number 2 [4]:…”

Section: A Leachate Feedmentioning

confidence: 99%

“…C 0 (mg/l) and C (mg/l) are influent and residual metal concentrations at steady rate, and X (g/L) is the biomass concentration at the end of the aerobic phase in the sludge withdrawal stream [4]. wastes), 7.25% paper, 1.91% glass, 2.34% metals, 8.4% plastic, 2.37% textile, 1.09% rubbers, 1.27% wood, and 3.6% oversize and others [7].…”

Section: A Leachate Feedmentioning

confidence: 99%

“…In fact biological wastewater treatment systems are mainly designed for organic matter removal and only side-benefit can be observed in the treatment of heavy-metal-bearing streams. Microorganisms of activated sludge can remove heavy metals by different mechanisms, which can be classified according to their dependence or less on the metabolism activity as bioaccumulation and biosorption, respectively [4].…”

Section: Introductionmentioning

confidence: 99%

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Heavy Metals Adsorption by Mixed Liquid Suspended Solids (MLSS)

Mahmoudkhani¹,

Bayatian²,

Khani³

2016

IJESD

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Abstract-One of the important concerns in Tehran municipal landfill is the production of leachate and its potential for water resources pollution. This paper investigates the removal of heavy metals from landfill leachate by using a combined system of a membrane Bioreactor (MBR) together with reverse osmosis. The leachate was collected from a landfill in the vicinity of Tehran nearly 1 year old, The data indicated that the system provided high removals of Fe, Ni, Cu, Zn, Pb, Cd and Cr equal to 98%, 79%, 85%, 85%, 87%, 82%, and 73% respectively and heavy metal concentration in MBR effluent is a function of aeration ratio and bioaccumulation. Among the metals investigated in the present study It can be concluded that the extracellular adsorption, is the principal removal process of the metals, compared to other removal mechanisms such as bioaccumulation or intracellular accumulation, Cu, Cr, Ni, Pb, Cd, Zn, and Fe, respectively, have higher capability of being adsorbed through biological processes by MLSS. Also, based on Freundlich Isotherm, Cr, Cd, Pb, Cu, Zn, and Fe, in turn, have the most saturation rate for every gram of MLSS and their maximum fast absorption is 0.000023, 0.0035, 0.22, 5, 6, 130 mg/g MLSS, respectively.

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“…For this purpose the central composite design (CCD) as a response surface approach is developed for finding out the optimum conditions and maximum removal of Ag(I) from aqueous solution [15,18,19]. Apart from that, the determination of proton binding active sites at different pHs on the biosorbent along with recognition of the mechanism of Ag(I) removal from aqueous solutions using Cercis siliquastrum tree leaves as a biosorbent are pursued [25][26][27]. The Ag(I) biosorption characterization is also conducted using Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD) analysis as well as thermodynamic, and kinetic consideration.…”

Section: CLmentioning

confidence: 99%

Cercis siliquastrum Tree Leaves as an Efficient Adsorbent for Removal of Ag(I): Response Surface Optimization and Characterization of Biosorption

Zolgharnein

Shariatmanesh

Asanjarani

2013

CLEAN Soil Air Water

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The Cercis siliquastrum tree leaves are introduced as a low cost biosorbent for removal of Ag(I) from aqueous solution in a batch system. FT-IR, XRD analysis, and potentiometric titration illustrate that the adsorption took place and the acidic functional group (carboxyl) of the sorbent was involved in the biosorption process. In addition, it was observed that the pH beyond pH pzc 4.4 is favorable for the removal procedure. The effect of operating variables such as initial pH, temperature, initial metal ion concentration, and sorbent mass on the Ag(I) biosorption was analyzed using response surface methodology (RSM). The proposed quadratic model resulting from the central composite design approach (CCD) fitted very well to the experimental data. The optimum condition obtained with RSM was an initial concentration of Ag(I) of 85 mg L À1 , pH ¼ 6.3 and sorbent mass 0.19 g. The applicability of different kinetic and isotherm models for current biosorption process was evaluated. The isotherm, kinetic, and thermodynamic studies showed the details of sorbate-sorbent behavior. The competitive effect of alkaline and alkaline earth metal ions during the loading of Ag(I) was also considered.

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Mechanisms of heavy-metal removal by activated sludge

Cited by 93 publications

References 33 publications

Investigating Activated Sludge Microbial Population Efficiency in Heavy Metals Removal from Compost Leachate

Investigating Activated Sludge Microbial Population Efficiency in Heavy Metals Removal from Compost Leachate

Heavy Metals Adsorption by Mixed Liquid Suspended Solids (MLSS)

Cercis siliquastrum Tree Leaves as an Efficient Adsorbent for Removal of Ag(I): Response Surface Optimization and Characterization of Biosorption

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