Mechanistics of nickel sorption by activated sludge

Arican, Betul; Gokcay, Celal F.; Yetış, Ülkü

doi:10.1016/s0032-9592(02)00015-8

Cited by 77 publications

(41 citation statements)

References 30 publications

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“…EPS, which are secreted in part by microorganisms during growth, consist of various organic substances such as polysaccharides, uronic acids, proteins, nucleic acids, and lipids. It has been suggested that the mechanism of sorption is based on exchange reactions, complexation with negatively charged groups, adsorption, and precipitation [10][11][12] . Exposure to heavy metals has however been reported to cause a change in the composition (monitored through biomass C/P ratio) of extracellular polymeric substances 13 .…”

Section: Introductionmentioning

confidence: 99%

Untitled

Ong¹,

Toorisaka²,

Hirata³

et al. 2010

ScienceAsia

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The adsorption of Cu, Cd, Ni, Zn, and Cr from synthetic solutions on powdered activated carbon (PAC), activated sludge, and dried sludge were investigated under laboratory conditions to assess its ability to remove heavy metals. The adsorption efficiency increased rapidly within the first 30 min and then slowed down as it approached a steady state after 5 h of contact time. The results showed that activated sludge and PAC had a higher adsorption capacity than dried sludge. However, PAC showed a better adsorption capacity for Cu, Zn, and Ni than activated sludge. The maximum adsorption capacity, as quantified by the Langmuir parameter Q for activated sludge was 44, 30, 24, 23, and 18 mg/g for Cu, Ni, Cd, Cr, and Zn, respectively. In the case of dried sludge, the respective values of Q were 20, 13, 11, 3, and 10 mg/g. The acute toxicity of these five heavy metals to the activated sludge microorganisms was determined on the basis of the reduction in the specific oxygen uptake rate (SOUR). The results obtained from the SOUR measurements indicated a decreasing toxicity scale, Cu > Cd > Ni Cr > Zn on activated sludge microorganisms.

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Section: Introductionmentioning

confidence: 99%

Untitled

Ong¹,

Toorisaka²,

Hirata³

et al. 2010

ScienceAsia

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“…3 In anaerobic bioreactors, trace elements are not only present as free ions, but as different chemical species because of the typical process conditions that prevail in these reactors, eg pH, redox potential, alkalinity, concentrations of phosphorus and sulfur. 4,5 Precipitation of metals, eg as sulfides or carbonates, 6 -10 may also affect their bioavailability.…”

Section: Introductionmentioning

confidence: 99%

Nickel and cobalt sorption on anaerobic granular sludges: kinetic and equilibrium studies

Hullebusch

Zandvoort

Lens

2004

J of Chemical Tech & Biotech

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The kinetics and equilibria of sorption of the divalent metal ions cobalt and nickel onto anaerobic granular sludge are described. Single component and binary equimolar systems were studied at different pH values (pH 6, 7 and 8). The kinetic modelling of metal sorption by anaerobic granular sludge has been carried out using Lagergren equations. On fitting the experimental kinetic data both in firstand pseudo-second-order equations, the regression analysis of a pseudo-second-order equation gave a higher r 2 value, indicating that both external mass transfer and intra-particle diffusion are involved in the sorption process. The experimental isotherm data were analysed using the Langmuir, Freundlich and Redlich-Peterson equations. The Redlich isotherm, a combination of the Langmuir and Freundlich equations, was found to have the highest regression correlation coefficients at pH 7. At pH 8, the Langmuir mechanism dominated for cobalt and nickel adsorption. In contrast, at pH 6, the Freundlich equation gave a better correlation coefficient which suggests a more heterogeneous adsorption at that pH.

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“…The biosorbent prepared with sewage sludge can remove heavy metals from wastewater by complex mechanisms including surface complexation with negatively charged biopolymers, ion exchange and physical adsorption [5]- [7]. These mechanisms are influenced by biosorbent components and operational conditions: pH, temperature, hydraulic residence time [8], sludge age [9], feed C/N ratio [10], dissolved organic matter [11], etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of Alkali Treatment on Heavy Metals Adsorption Capacity of Sewage Sludge

Beijing¹

2015

GEP

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Sewage sludge is the promising raw material for biosorbent preparation. In this work, we evaluated the heavy metals adsorption characteristics of alkali treated sewage sludge (ATSS) by equilibrium studies. The adsorption isotherms were fitted with Langmuir and Freundlich models. Comparing with untreated sewage sludge, the total adsorption capacity (qm) of ATSS (prepared with 0.125 mol/L NaOH) for Cd, Pb, Ni, increased by 0.51, 0.70 and 0.32 mmol/g, respectively. When the NaOH concentration for ATSS preparation increased from 0.125 mol/L to 0.25 mol/L, the qm of ATSS for Pb decreased from 1.05 mmol/g to 0.84 mmol/g. However, when the NaOH concentration increased from 0.25 mol/L to 7.5 mol/L, it showed increasing trend. According to the IR spectra data, the adsorption effect of biosorbent for heavy metals was mainly due to the complexation of -N-H groups and -COOH groups.

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Mechanistics of nickel sorption by activated sludge

Cited by 77 publications

References 30 publications

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Nickel and cobalt sorption on anaerobic granular sludges: kinetic and equilibrium studies

Effect of Alkali Treatment on Heavy Metals Adsorption Capacity of Sewage Sludge

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