Cadmium adsorption characteristic of alkali modified sewage sludge

Hu, Jianlong; He, Xuwen; Wang, Chunrong; Li, Jingwen; Zhang, Chunhui

doi:10.1016/j.biortech.2012.06.100

Cited by 44 publications

(17 citation statements)

References 27 publications

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“…Nevertheless, there are still many aspects that need to be solved before that the marine green algae to be used in real applications in wastewater treatment. The most important of these are: (i) the biosorption capacity of marine green algae should be improved, mainly because low biosorption capacity may cause large amounts of wastes loaded with heavy metals [18], and (ii) minimization of secondary pollution, which is determined by the dissolution of organic compounds from biomass, during of biosorption process [19]. According to the studies from literature, the biosorption capacities of marine green algae for different heavy metals varied from 0.01 to 1.9 mmol g -1 , which is significant lower that those obtained for commercial adsorbents, such as activated carbon.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Biosorption Characteristics of Marine Green Algae (Ulva lactuca)for Heavy Metals Removal by Alkaline Treatment

Bulgariu¹,

Bulgariu²

2014

J Bioprocess Biotech

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The biosorption characteristics of alkaline treated marine green algae (Ulva lactuca) have been studied for the removal of Pb(II), Zn(II) and Co(II) from aqueous solution, at room temperature. Batch experiments were performed to examine the effect of NaOH concentration used for treatment, initial heavy metals concentration and contact time, in comparison with untreated algae. The biosorption capacity of alkaline treated marine green algae increases with increasing of NaOH concentration, up to 0.6 mol L -1 , when an improvement of biosorption capacity with 11.75% for Pb(II), 60.64% for Zn(II) and 62.53% for Co(II) respectively, was obtained. The Langmuir model provides best correlation of equilibrium experimental data, and the pseudo-second order describes well the biosorption kinetics of considered heavy metals. The heavy metal ions could be easily desorbed from loaded biosorbent, and this may be reuse at least in three biosorption/desorption cycles.

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Section: Introductionmentioning

confidence: 99%

Enhancing Biosorption Characteristics of Marine Green Algae (Ulva lactuca)for Heavy Metals Removal by Alkaline Treatment

Bulgariu¹,

Bulgariu²

2014

J Bioprocess Biotech

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“…They can be gained from the linear form of Eq. (9): f e e k C n Q log log 1 log + = (9) Experimental data in Fig. 2 were fi tted to Eq.…”

Section: Adsorption Isotherm Of Cu (Ii) On Ccsmentioning

confidence: 99%

“…(7) and Eq. (9). The values of Langmuir constants k L and Q max and Freundlich parameters K f and n are presented in Table 5.…”

Section: Adsorption Isotherm Of Cu (Ii) On Ccsmentioning

confidence: 99%

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Preparation and Cu (II) Adsorption Characteristics of Carboxymethyl Cross-Linked Sewage Sludge

Wang

Zhang

2016

Pol. J. Environ. Stud.

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Sewage sludge was cross-linked with epichlorohydrin to increase its mechanical strength and applicability as an absorbent material. We investigated the effect of the conditions of the cross-linking reaction on the mechanical strength and Cu (II) adsorption capacity of epichlorohydrin cross-linking sewage sludge (ECS). Experimental results showed that cross-linking can raise signifi cantly the mechanical strength of sewage sludge. To improve the adsorption capacity of ECS, carboxymethyl cross-linked sewage sludge (CCS) with maximal adsorption capacity (65mg/g) for Cu (II) was synthesized from ECS by using chloroacetic acid as the etherifi cation agent. The experimental results showed that the adsorption properties of CCS for Cu (II) could best be described by the pseudo-second order model and Langmuir model, and the adsorption mechanism was ion exchange. Our data suggest that CCS is a promising absorbent for removal of heavy metals from wastewater.

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“…One application that has received increasing attention is the utilization of sewage sludge as abundant low cost alternative adsorbent for the removal of pollutants from wastewater (Aksu, 2005). To improve the biosorption capacity, (Hu et al, 2012) proposed a new biosorbent preparation method by alkali modification of sewage sludge. They found that the cadmium adsorption capacity of biosorbent increased by 0.713 mmol·g −1 with NaOH solution concentration (range from 0.25 to 7.5 mol·L…”

Section: Introductionmentioning

confidence: 99%

Competitive Biosorption of Lead Mercury Chromium and Arsenic Ions onto Activated Sludge in Batch Adsorber

Sulaymon

Yousif²,

Al-Faize

2012

AST

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A wide range of batch experiments were carried out for estimation of the key process parameters in competitive biosorption of Pb 2+ , Hg 2+ , Cr 3+ and As 5+ from simulated of wastewater onto dry activated sludge in batch adsorber. Eleven isotherm models were used for single component and five models for multi-component systems. The Langmuir model gave the best fit for the data of single component, while the binary, ternary and quaternary systems were fitted successfully with extended Langmuir model. The biosorption capacity for single metal decreased by 11-51 %, 53-88 % and 79-94 % in the binary, ternary and quaternary systems respectively at the optimum agitation speed 600-800 rpm. An order of metal biosorption capacity onto dried activated sludge was the same in the case of . FT-IR analysis was carried out before and after biosorption to determine which functional groups were responsible for binding the heavy metals. Kinetic study showed that pseudo-second order model was well fitted for all metals ions. R 2 used to enhance the justification analysis for each used model.

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Cadmium adsorption characteristic of alkali modified sewage sludge

Cited by 44 publications

References 27 publications

Enhancing Biosorption Characteristics of Marine Green Algae (Ulva lactuca)for Heavy Metals Removal by Alkaline Treatment

Enhancing Biosorption Characteristics of Marine Green Algae (Ulva lactuca)for Heavy Metals Removal by Alkaline Treatment

Preparation and Cu (II) Adsorption Characteristics of Carboxymethyl Cross-Linked Sewage Sludge

Competitive Biosorption of Lead Mercury Chromium and Arsenic Ions onto Activated Sludge in Batch Adsorber

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