Reducing the chlorine dioxide demand in final disinfection of drinking water treatment plants using activated carbon

Sorlini, Sabrina; Biasibetti, Michela; Collivignarelli, Maria Cristina; Crotti, Barbara Marianna

doi:10.1080/09593330.2014.994043

Cited by 22 publications

(11 citation statements)

References 34 publications

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“…Since the exposure to these compounds can determine oxidative damage to red blood human cells, the World Health Organization fixed a regulation limit of 5 mg L -1 for chlorine dosage in disinfection and 700 µg L -1 for both and ClO 3 in drinking water [13][14][15][16]. In order to minimize ClO 2 and ClO 3 formation in final disinfection, ClO 2 demand in final disinfection can be reduced [17]. Different treatment processes can be employed for ClO 2 removal, such as reduction with ferrous ions, adsorption with activated carbon, oxidation with ozone, and reduction with sulfur compounds [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Removal of chlorite from drinking water: laboratory and pilot-scale studies to predict activated carbon performance at full scale

Sorlini¹,

Biasibetti²,

Gialdini³

et al. 2017

Desalination and Water Treatment

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a b s t r ac tChlorite is a by-product that can be produced in the disinfection process of a drinking water treatment plant (DWTP) using chlorine dioxide. The aim of this work was to evaluate the influence of the adsorption process with activated carbon on chlorite removal and to demonstrate how laboratory-scale and pilot-scale tests can be useful to predict granular activated carbon (GAC) performance on chlorite removal at full scale in a DWTP. A first series of tests were carried out at laboratory scale using small carbon columns. A second series of tests were performed at semi-full scale using a pilot plant at the DWTP of Vescovana (Padova, Italy). The laboratory-scale tests show that carbon pre-loading significantly reduces the ClO 2 removal yield, by about 30%-40%. Both laboratory-scale tests and small column tests show that in virgin conditions the mineral carbon shows a higher ClO 2 removal efficiency than the vegetal one, while in pre-loaded conditions an opposite behavior is observed. The results of the pilot plant test show that GAC ensures a good ClO 2 removal yield, close to 55%. The results show that small column tests at laboratory scale are extremely useful to predict pilot column performance and, therefore, full-scale DWTP performance.

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Section: Introductionmentioning

confidence: 99%

Removal of chlorite from drinking water: laboratory and pilot-scale studies to predict activated carbon performance at full scale

Sorlini¹,

Biasibetti²,

Gialdini³

et al. 2017

Desalination and Water Treatment

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“…Among these methods, the adsorption process is widely adopted in this area because of its complete collection and removal of oil. Adsorbents such as peat (Cojocaru et al, 2011), kapok (Ali et al, 2012;Wang et al, 2013), straw (Ibrahim et al, 2010), sawdust (Chouchene et al, 2010), organophilic clays (da Silva et al, 2014), exfoliated graphite (Ji et al, 2009;, expanded perlite (Alihosseini et al, 2010), and activated carbon (Sorlini et al, 2015;Tan et al, 2009) have been tried in the adsorption of waste oil. Nevertheless, these systems require preliminary treatment using physicochemical and microbiological treatments to enhance the adsorption.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Three‐Dimensional Chitosan–Graphene Oxide Aerogel for Residue Oil Removal

Guo

Zhu

et al. 2016

Water Environment Research

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Graphene oxide has been used as an adsorbent in wastewater treatment. However, the hydrophily and dispersibility in aqueous solution limit its practical application in environmental protection. In this paper, a novel, environmentally friendly adsorbent, chitosan and chitosan-graphene oxide aerogels with a diverse shape, large specific surface area, and unique porous structure were prepared by a freeze-drying method. The structure of the adsorbents was investigated using scanning electron microscopy, Fourier transform-infrared spectroscopy, and X-ray diffraction (XRD); the specific surface area and swelling capability were also characterized. In addition, removal of diesel oil from seawater by chitosan aerogel (CSAG) and chitosan-graphene oxide aerogel (AGGO-1 and AGGO-2) was studied and batch adsorption experiments were carried out as a function of different adsorbent dosages (0-6 g), contact time (0-120 minutes), pH (3-9), and initial concentrations of oil residue (3-30 g/L) to determine the optimum condition for the adsorption of residue oil from seawater. The results showed that the chitosan-graphene oxide aerogels were more effective to remove diesel oil from seawater compared with pure chitosan aerogel. A removal efficiency ≥ 95% of the chitosan-graphene oxide aerogels could be achieved easily at the initial concentrations of 20 g/L, which indicated that the chitosan-graphene oxide aerogels can be used to treat the industrial oil leakage or effluent in the natural water.

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“…A mineral, coal-based, mesoporous granular activated carbon placed downstream of a sand filter in a drinking water treatment plant reduced chlorine dioxide demand by 60-80% (Sorlini, Biasibetti, Collivignarelli, and Crotti, 2015).…”

mentioning

confidence: 99%

Disinfection Processes

Munakata

Kuo²

2016

Water Environment Research

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Reducing the chlorine dioxide demand in final disinfection of drinking water treatment plants using activated carbon

Cited by 22 publications

References 34 publications

Removal of chlorite from drinking water: laboratory and pilot-scale studies to predict activated carbon performance at full scale

Removal of chlorite from drinking water: laboratory and pilot-scale studies to predict activated carbon performance at full scale

Preparation of Three‐Dimensional Chitosan–Graphene Oxide Aerogel for Residue Oil Removal

Disinfection Processes

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