Regeneration of natural zeolite polluted by lead and zinc in wastewater treatment systems

Katsou, Evina; Malamis, Simos; Tzanoudaki, Myrto; Haralambous, K.J.; Loizidou, Maria

doi:10.1016/j.jhazmat.2010.12.061

Cited by 81 publications

(46 citation statements)

References 50 publications

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“…In cyclic adsorption and desorption study, the adsorption by clinoptilolite remained satisfactory up to six cycles with EDTA and up to nine cycles with NaCl as regenerating chemicals, respectively. Katsou et al (2011) observed more than 98.5 % desorption efficiency for Zn from clinoptilolite using 1 M KCl as desorbent (Table 1). Xu et al (2012) investigated removal of Zn, regeneration and reuse possibility of clinoptilolite (a low-cost and abundant adsorbent) using NaCl solutions with different concentrations, pH and with different adsorbent-regenerant ratio.…”

Section: Review Of Literaturementioning

confidence: 97%

“…Ten cycles of adsorption-desorption experiments were performed; the regeneration process did not damage the biomass and achieved 95 % elution efficiency (Table 1). In a study of regeneration of lead (Pb)-loaded clinoptilolite, Katsou et al (2011) used 3 M KCl as desorbing agent. With increase in regeneration cycle, regeneration efficiency decreased.…”

Section: Review Of Literaturementioning

confidence: 99%

“…Tseng et al (2009) reported EDTA as an effective recovery agent for recovery of Cu(II) ion. Katsou et al (2011) investigated the regeneration of clinoptilolite, contaminated with zinc and lead, using 1 M KCl and 3 M KCl, respectively. Kordialik-Bogacka (2011) tried to recover cadmium and lead from yeast biomass using EDTA, HCl and H 2 SO 4 and found 85 % desorption efficiency with EDTA.…”

Section: Use Of Acids For Regeneration and Recovery Of Heavy Metalsmentioning

confidence: 99%

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Regeneration of adsorbents and recovery of heavy metals: a review

Lata

Singh

Samadder

2014

Int. J. Environ. Sci. Technol.

345

131

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In last a few decades, significant improvements were made in both efficiency and economy for removal of heavy metals and metalloid (arsenic) from water using adsorbents. But less attention was paid to recycling of used adsorbents and recovery of the heavy metals from the desorbing agents. For regeneration and reuse of adsorbents, various possible regenerating agents such as acids, alkalis and chelating agents (such as ethylene diamine tetraacetic acid) were used by many researchers with very limited success in some of the studies only up to a limited number of adsorption-desorption cycles. Only a few of the reported studies were focused on recovery of adsorbed (from saturated adsorbents) and desorbed metals (from regenerating agents). Though the management of the used adsorbent and recovery of heavy metals is one of the most important aspects, but only a limited number of research works considered the fate of spent adsorbents before disposal. This review summarizes the removal efficiency of various adsorbents, desorption efficiency of various regenerating agents and recovery of the heavy metals from both saturated adsorbents and desorbing solvents used for regeneration. The study will help the scientific community working on adsorption studies to take up research initiatives required to address the feasible recovery methods of heavy metals from the used adsorbents, to study the possible reuse of the desorbing agents and to choose a suitable desorbing/regenerating agent for a particular adsorbent.

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Section: Review Of Literaturementioning

confidence: 97%

Section: Review Of Literaturementioning

confidence: 99%

Section: Use Of Acids For Regeneration and Recovery Of Heavy Metalsmentioning

confidence: 99%

See 1 more Smart Citation

Regeneration of adsorbents and recovery of heavy metals: a review

Lata

Singh

Samadder

2014

Int. J. Environ. Sci. Technol.

345

131

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“…For efficient water treatment an important property of natural zeolite is regeneration through cyclic processes and their re-use. Recent studies of desorption efficiency of metal ions and regeneration natural zeolite -clinoptilolite are presented in Table 10 and indicate that the process is reversible in most cases [77]. Sorption of ions on to iron modified natural zeolite depends on the success of chemical modification and creation of iron hydroxide on its surface.…”

Section: "Batch" Processmentioning

confidence: 99%

Natural Zeolites in Water Treatment – How Effective is Their Use

Margeta¹,

Logar²,

Šiljeg³

et al. 2013

Water Treatment

146

145

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Additional information is available at the end of the chapter http://dx.doi.org/10.5772/50738 IntroductionNatural zeolites are environmentally and economically acceptable hydrated aluminosilicate materials with exceptional ion-exchange and sorption properties. Their effectiveness in different technological processes depends on their physical-chemical properties that are tightly connected to their geological deposits. The unique treedimensional porous structure gives natural zeolites various application possibilities. Because of the excess of the negative charge on the surface of zeolite, which results from isomorphic replacement of silicon by aluminum in the primary structural units, natural zeolites belong to the group of cationic exchangers. Numerous studies so far have confirmed their excellent performance on the removal of metal cations from wastewaters. However, zeolites can be chemically modified by inorganic salts or organic surfactants, which are adsorbed on the surface and lead to the generation of positively charged oxihydroxides or surfactant micelles, and which enables the zeolite to bind also anions, like arsenates or chromates, in stable or less stable complexes. Natural zeolites have advantages over other cation exchange materials such as commonly used organic resins, because they are cheap, they exhibit excellent selectivity for different cations at low temperatures, which is accompanied with a release of non-toxic exchangeable cations (K + , Na + , Ca 2+ and Mg 2+ ) to the environment, they are compact in size and they allow simple and cheap maintenance in the full-scale applications. The efficiency of water treatment by using natural and modified zeolites depends on the type and quantity of the used zeolite, the size distribution of zeolite particles, the initial concentration of contaminants (cation/anion), pH value of solution, ionic strength of solution, temperature, pressure, contact time of system zeolite/solution and the presence of other organic compounds and anions. For water treatment with natural zeolites, standard procedures are used, usually a procedure in column or batch process. Ion exchange and adsorption properties of natural zeolites in comparison with other chemical and biological processes have the advantage of Water Treatment 82removing impurities also at relatively low concentrations and allows conservation of water chemistry, if the treatment is carried out in the column process [1]. Subject of further academic and industrial research should be to improve the chemical and physical stability of modified zeolites and to explore their catalytic properties, which would allow their use in catalytic degradation of organic pollutants. More careful consideration of their superb metal removal properties and awareness of possible regeneration or further use of contaminant/metal-loaded forms can considerably increase their environmental application possibilities, with a focus the reduction of high concentrations of cations and anions in drinking water and wastewater, for surface, und...

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“…Disposal of large volume of used zeolite can be an operational issue that needs to be addressed. The prospect of re-generating zeolite after use has been widely discussed in research literature [75,76].…”

Section: Zeolite Concentrationmentioning

confidence: 99%

Influence of Physical and Chemical Parameters on the Treatment of Heavy Metals in Polluted Stormwater Using Zeolite—A Review

Ziyath¹,

Mahbub²,

Goonetilleke³

et al. 2011

JWARP

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Zeolite-based technology can provide a cost effective solution for stormwater treatment for the removal of toxic heavy metals under increasing demand of safe water from alternative sources. This paper reviews the currently available knowledge relating to the effect of properties of zeolites such as pore size, surface area and Si:Al ratio and the physico-chemical conditions of the system such as pH, temperature, initial metal concentration and zeolite concentration on heavy metal removal performance. The primary aims are, to consolidate available knowledge and identify knowledge gaps. It was established that an in-depth understanding of operational issues such as, diffusion of metal ions into the zeolite pore structure, pore clogging, zeolite surface coverage by particulates in stormwater as well as the effect of pH on stormwater quality in the presence of zeolites is essential for developing a zeolite-based technology for the treatment of polluted stormwater. The optimum zeolite concentration to treat typical volumes of stormwater and initial heavy metal concentrations in stormwater should also be considered as operational issues in this regard. Additionally, leaching of aluminium and sodium ions from the zeolite structure to solution were identified as key issues requiring further research in the effort to develop cost effective solutions for the removal of heavy metals from stormwater.

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Regeneration of natural zeolite polluted by lead and zinc in wastewater treatment systems

Cited by 81 publications

References 50 publications

Regeneration of adsorbents and recovery of heavy metals: a review

Regeneration of adsorbents and recovery of heavy metals: a review

Natural Zeolites in Water Treatment – How Effective is Their Use

Influence of Physical and Chemical Parameters on the Treatment of Heavy Metals in Polluted Stormwater Using Zeolite—A Review

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