Removal of Chlorine and Chlorinated Organic Compounds from Aqueous Media Using Substrate-Anchored Zero-Valent Bimetals

Nduta, Kiriro G.; Mwangi, Isaac W.; Wanjau, Ruth; Ngila, Jane Catherine

doi:10.1007/s11270-015-2685-y

Cited by 6 publications

(1 citation statement)

References 55 publications

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“…After the triple box process of “neutralization, coagulation, and precipitation”, the content of heavy metals and suspended solids in desulfurization wastewater is reduced but that of chlorine remains high. The 2017 guidelines on feasible technologies for the prevention and control of pollution in thermal power plants (HJ2301-2017) indicated that the key to achieving a near-zero discharge of wastewater is to realize a zero discharge of desulfurization wastewater. − The main methods currently used to remove Cl – from wastewater include electric coagulation, ion exchange, and adsorption. − Adsorption is regarded as one of the effective ways to uptake Cl – from wastewater due to its advantages of simple operation, recyclability, etc.…”

Section: Introductionmentioning

confidence: 99%

Removal of Chlorine Ions from Desulfurization Wastewater by Modified Fly Ash Hydrotalcite

Liu

et al. 2020

ACS Omega

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The effective removal of chlorine ion from the desulfurization slurry is of great significance to the stable operation of the desulfurization system. Modified fly ash hydrotalcites were prepared by alkali/acid-combined roasting and microwaving and used as an adsorbent for chlorine ion in desulfurized wastewater. The specific surface area and porosity of different adsorbents were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The impacts of pH, temperature, adsorbent dosage, and adsorption shaking time on adsorption performance were investigated. Results showed the alkali-combined roasting-modified fly ash hydrotalcite has the optimum removal effect on Cl–. The optimal adsorption performance was achieved when the pH was 8, the adsorption temperature was 60 °C, the mass concentration of adsorbent was 10 g/L, the adsorption shaking time was 180 min, and the removal percentage of Cl– was 68.1%. The adsorption isotherm was consistent with the Langmuir isotherm model, and the adsorption saturation was 694.4 mg/g, which belonged to monolayer adsorption.

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