Complex extraction and stripping of H acid wastewater

Li, S.J.; Zhang, Lin; Chen, H.I.; Chai, Huifang; Gao, Congjie

doi:10.1016/j.desal.2006.02.061

Cited by 17 publications

(13 citation statements)

References 20 publications

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“…When pH < 7 there is a strong anion association action between the trialkylamine extractant and the organic compounds [35]. The extraction mechanism of trialkylamine in kerosene is mainly based on the ion exchange [35]. The extraction reactions can be described as follows:…”

Section: Theorymentioning

confidence: 99%

“…The sulfonic group -SO 3 Na of K-2BP in aqueous solutions of organic compounds is in the state of -SO 3 − . When pH < 7 there is a strong anion association action between the trialkylamine extractant and the organic compounds [35]. The extraction mechanism of trialkylamine in kerosene is mainly based on the ion exchange [35].…”

Section: Theorymentioning

confidence: 99%

“…The liquid-liquid complex extraction, also referred to as solvent extraction or partitioning, is a kind of ionassociated extraction system, in which cations and anions are associated with each other in the organic phase, from aqueous phase [35,36]. The sulfonic group -SO 3 Na of K-2BP in aqueous solutions of organic compounds is in the state of -SO 3 − .…”

Section: Theorymentioning

confidence: 99%

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Removal of sodium salts and chemical oxygen demand from real reactive dye wastewater by the integrated process of chemical precipitation and extraction

Wang

Dong

2015

Desalination and Water Treatment

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hua Dong (2015): Removal of sodium salts and chemical oxygen demand from real reactive dye wastewater by the integrated process of chemical precipitation and extraction, Desalination and Water Treatment, A B S T R A C TReal reactive brilliant red K-2BP (C. I. Reactive Red 24) dye wastewater is characterized by its very high chemical oxygen demand (COD), high concentration of sodium salt, and low biodegradability. A combined process of precipitation, complex extraction, and stripping was proposed as a method for treating such wastewater. Fluosilicic acid was selected as a precipitator for the recovery of sodium ions, trialkylamine (N235) as the extractant, and sodium hydroxide (NaOH) as a back-extractant. Our results indicated that desalination had the greatest influence on extraction rates while the phase ratio and the N235 concentration also influenced the reaction. Acid, which was an important factor affecting COD extraction, was produced during desalination process. We also noted a number of points of interest: that the extraction reaction could reach equilibrium in 20 min; that the COD removal rates tended to increase under certain conditions, with an increase in acidity of wastewater resulting in increased desalination rates, and an increased N235 concentration and phase ratio (O/A). Under optimum conditions the COD removal rates can reach 92%, the extractant could be regenerated by stripping with NaOH, and the stripping rate could reach an efficiency of 100%.

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Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

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Removal of sodium salts and chemical oxygen demand from real reactive dye wastewater by the integrated process of chemical precipitation and extraction

Wang

Dong

2015

Desalination and Water Treatment

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“…Although naphthalene sulphonates themselves impart a low acute biotoxicity and have neither mutagenic nor carcinogenic effects, their persistence and mobility in the environment as a result of their physicochemical properties such as their high solubility in water and low octanol-water partition coefficient (Lange et al 1998;Li et al 2006) may cause ecological problems. Due to the deactivating nature of their sulphonated functional groupings (R-SO 3 H), naphthalene sulphonates have an extremely low reactivity against electrophilic addition reactions including microbial degradation (Rieger et al 2002).…”

Section: Industrial Significance Sources and Fate In Natural Watersmentioning

confidence: 99%

Xenobiotics in the Urban Water Cycle

Fatta‐Kassinos¹,

Bester²,

Keummerer³

2010

Environmental Pollution

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“…In this study, anion exchange resin was employed to adsorb H‐acid from the wastewater and other pollutants, including T‐acid (1‐naphthylamine‐3,6,8‐trisulphonic acid) and chromotropic acid (1, 8‐dihydroxy‐3, 6‐naphthalene disulphonic acid) [28].…”

Section: Introductionmentioning

confidence: 99%

Decolorisation of H‐acid manufacturing process wastewater by anion exchange resin

Yuan

Luo

2007

Coloration Technology

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Anion exchange resin was employed to examine the feasibility to treat the H‐acid manufacturing wastewater by column experiment. Besides the acidity recovery, the decoloring efficiency and chemical oxygen demand (COD) removal efficiency of the anion exchange resin was investigated in the experiments. The results revealed that the anion exchange resin was able to remove colourful pollutants and degrade a part of COD effectively, and at the same time reserve acidity in the wastewater solution. The resin regenerated by a 10% NaCl aqueous solution had the same ability to discolour and remove the COD from the wastewater as the new resin had. The resin regenerated by 3% w/w NaCl aqueous solution, which was the same concentration as seawater, also had, to some extent, the same effect on decolorisation and the removal of COD; however, its colour and COD removal performance was not as efficient as the resin regenerated by 10% w/w NaCl and the new resin. H‐acid (0.25%) was also successfully recovered from the regenerating solutions.

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Complex extraction and stripping of H acid wastewater

Cited by 17 publications

References 20 publications

Removal of sodium salts and chemical oxygen demand from real reactive dye wastewater by the integrated process of chemical precipitation and extraction

Removal of sodium salts and chemical oxygen demand from real reactive dye wastewater by the integrated process of chemical precipitation and extraction

Xenobiotics in the Urban Water Cycle

Decolorisation of H‐acid manufacturing process wastewater by anion exchange resin

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