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Erschienen in: Clean Technologies and Environmental Policy 3/2023

02.11.2022 | Original Paper

Using waste to treat waste: clean production of erdite/zeolite composite flocculant from groundwater treatment sludge for real electroplating wastewater treatment

verfasst von: Yidi Gao, Dongxu Liang, Yuxin Zhang, Yu Chen, Suiyi Zhu, Hong Zhang, Tong Sun

Erschienen in: Clean Technologies and Environmental Policy | Ausgabe 3/2023

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Abstract

Groundwater sludge was a water treatment sludge containing Fe, Al and Si. Herein, the groundwater sludge was recycled to produce erdite/zeolite composite flocculant via a green route for real electroplating wastewater treatment, without producing any secondary waste. The sludge mainly comprised 15.2% Fe, 11.9% Al and 6.1% Si. After treatment in Na2S-containing solution at 80 °C under atmospheric pressure, repolymerization of Fe-bearing oxyhydroxide as erdite occurred, accompanied by the dissolution and recrystallization of Al/Si-bearing compounds as zeolite A, to produce an erdite/zeolite-bearing flocculant with the remainder of the used alkaline solution. The remaining Al in this used solution was removed by generating zeolite-Na6[AlSiO4]6·4H2O, and the supernatant was completely used in the next round with a supplementary of 0.3 mol/L Na2S without any discharge. The heavy metals in the electroplating wastewater in the complex state are difficult to remove by conventional water treatment methods. Compared with commonly used reagents (such as polyaluminum chloride, polyferric sulfate and activated carbon), this flocculant shows an excellent effect in removing Zn/Ni in real electroplating wastewater. Moreover, the removal data fitted well with pseudo-second adsorption kinetics. In the flocculant, erdite was spontaneously decomposed as fine colloids with abundant sulfhydryl groups to effectively complex Zn/Ni in competition with organics complexing in the wastewater. However, zeolite A was stable and provided minimal contribution in the Zn/Ni removal. The clean route provided a practical strategy to convert Fe/Al-rich sludge into erdite-containing high-efficiency electroplating wastewater treatment flocculant for large-scale production.

Graphical abstract

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Metadaten
Titel
Using waste to treat waste: clean production of erdite/zeolite composite flocculant from groundwater treatment sludge for real electroplating wastewater treatment
verfasst von
Yidi Gao
Dongxu Liang
Yuxin Zhang
Yu Chen
Suiyi Zhu
Hong Zhang
Tong Sun
Publikationsdatum
02.11.2022
Verlag
Springer Berlin Heidelberg
Erschienen in
Clean Technologies and Environmental Policy / Ausgabe 3/2023
Print ISSN: 1618-954X
Elektronische ISSN: 1618-9558
DOI
https://doi.org/10.1007/s10098-022-02420-z

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