首页|Nanoscale Zero-Valent Iron(nZVI)for Heavy Metal Wastewater Treatment:A Perspective

Nanoscale Zero-Valent Iron(nZVI)for Heavy Metal Wastewater Treatment:A Perspective

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Industries such as non-ferrous metal smelting discharge billions of gallons of highly toxic heavy metal wastewater(HMW)worldwide annually,posing a severe challenge to conventional wastewater treat-ment plants and harming the environment.HMW is traditionally treated via chemical precipitation using lime,caustic,or sulfide,but the effluents do not meet the increasingly stringent discharge standards.This issue has spurred an increase in research and the development of innovative treatment technologies,among which those using nanoparticles receive particular interest.Among such initiatives,treatment using nanoscale zero-valent iron(nZVI)is one of the best developed.While nZVI is already well known for its site-remediation use,this perspective highlights its application in HMW treatment with metal recovery.We demonstrate several advantages of nZVI in this wastewater application,including its mul-tifunctionality in sequestrating a wide array of metal(loid)s(＞30 species);its capability to capture and enrich metal(loid)s at low concentrations(with a removal capacity reaching 500 mg g-1 nZVI);and its operational convenience due to its unique hydrodynamics.All these advantages are attributable to nZVI's diminutive nanoparticle size and/or its unique iron chemistry.We also present the first engineer-ing practice of this application,which has treated millions of cubic meters of HMW and recovered tons of valuable metals(e.g.,Cu and Au).It is concluded that nZVI is a potent reagent for treating HMW and that nZVI technology provides an eco-solution to this toxic waste.

Nanoscale zero-valent ironWastewaterHeavy metalResource recovery

Shaolin Li、Lei Li、Weixian Zhang

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State Key Laboratory for Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China

Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China

National Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaFoundation of State Key Laboratory of Pollution Control and Resource Reuse of China(PCRRY)

218761312022YFC3702101

2024

10.1016/j.eng.2023.08.012

工程(英文)

工程(英文)

CSTPCDEI
ISSN：2095-8099
年,卷(期)：2024.36(5)
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