Wastewater treatment: a case study of electronics manufacturing industry

Wahaab, Rifaat Abdel; Alseroury, Fathia A.

doi:10.1007/s13762-017-1529-2

Cited by 12 publications

(1 citation statement)

References 32 publications

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“…Percentage breakdown of nitrogen species, NO 3 – (mg-NO 3 – /L), NO 2 – (mg-NO 2 – /L), and NH 4 + (mg-NH 4 + /L), is indicated for each source. Data was compiled from the U.S. Environmental Protection Agency (EPA) development documents, , EPA’s database for industrial wastewater treatment technologies, and pertinent journal papers. ,− ,,− EPA’s specifications for nitrogen-contaminants in drinking water: <44.3 mg-NO 3 – /L (dashed blue line) and <3.3 mg-NO 2 – /L…”

Section: Theory and Numerical Modelmentioning

confidence: 99%

Harnessing Photoelectrochemistry for Wastewater Nitrate Treatment Coupled with Resource Recovery

Barrera

Chandran

2021

ACS Sustainable Chem. Eng.

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Wastewater is a misplaced resource well suited to recover nutrients, value-added chemicals, energy, and clean water. A photoelectrochemical device is proposed to transform wastewater nitrates to ammonia and nitrous oxide, coupled with water oxidation. Numerical models were developed to quantify the dependence of process efficiencies and nitrogen-removal rates on light absorber band gaps, electrocatalytic kinetic parameters, competing oxygen reduction and hydrogen evolution reactions, and the reacting nitrate species concentrations that affect the mass-transfer limited current densities. With a single light-absorber and state-of-the-art catalysts, optimal solar-to-chemical efficiencies of 7% and 10% and nitrogen-removal rates of 260 and 395 gN m -2 day -1 are predicted for nitrate reduction to ammonia and nitrous oxide respectively. The influence of competing reactions on the performance depends on the nitrate concentration and band gap of the light absorber modeled. Oxygen reduction is more dominant than hydrogen evolution to compete with the nitrate reduction reaction, but is mass-transfer limited. Even with kinetic parameters that enhanced the driving forces for the competing reactions, the performance is only minimally affected by these reactions for optimally selected band gaps and nitrate concentrations larger than 100 mM. Theoretically predicted peak nitrogen removal rates and specific energy intensities are competitive with reported estimates for bioelectrochemical and Sharon-Anammox processes for ammonia recovery and nitrogen removal respectively. This result, together with the added benefit of harnessing sunlight to produce value-added products, indicates promise in the photoelectrochemical approach as a tertiary pathway to recover nutrients and energy from wastewater nitrates.

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Section: Theory and Numerical Modelmentioning

confidence: 99%

Harnessing Photoelectrochemistry for Wastewater Nitrate Treatment Coupled with Resource Recovery

Barrera

Chandran

2021

ACS Sustainable Chem. Eng.

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An Assessment of Zinc Fluxes by Analyzing Monthly, Weekday, and Weekend Levels in a River

Andarani

Yokota

Inoue

et al. 2022

CLEAN Soil Air Water

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Unlike other potentially toxic metals, zinc (Zn) is indispensable to life but also poses environmental risks to aquatic organisms. Aichi Prefecture has the Japan's fourth-highest discharges of Zn into water bodies. It is likely that the Zn fluxes in Aichi's water bodies originate from industrial wastewater. This study evaluates the spatial-temporal and diel variability of Zn on sunny days during weekdays and weekends in the Umeda River. The most downstream point is considered as the most polluted section according to the monthly survey [dissolved Zn (D-Zn): 0.0046-0.0719 mg L −1 , particulate Zn (P-Zn): 0.42-2.01 mg g −1 ] that varied between seasons (coefficient of variation: 95% for D-Zn; 53% for P-Zn). The total Zn (T-Zn) concentrations on weekdays (0.015-0.043 mg L −1 ) at the most downstream point exhibit much higher concentrations than those during the weekends (undetected-0.032 mg L −1 ). Given the dissolved phase of these Zn levels (77 ± 11%), the Zn are likely discharged by industrial facilities on weekdays. The T-Zn loading on weekdays (56 g km −2 d −1 ) is approximately three times higher than that on weekends. At least 67% of the T-Zn and 70% of the D-Zn fluxes from industrial point sources are potentially discharged on weekdays.

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The recovery of metals as high value powders and nanopowders from industrial wastewaters using potential-controlled electrolysis

Luchcińska

Lach

Wróbel

et al. 2022

Int. J. Environ. Sci. Technol.

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The objective of the presented study was the recovery of Zn, Cr, Cu and Co in the form of powders and nanopowders from various types of industrial wastewaters. Powders and nanopowders as products of high added value find a wide applications in nanotechnology and material science and engineering. The metallic powders were obtained using potentiostatic electroreduction (potential-controlled electrolysis). The chosen method offers better control of the purity and structure of the products. The structure and size of crystallites depend on the value of electrolysis potentials and time, cathode material, concentrations of metal ions. In this investigation, the powders of different sizes ranging from 90 to 230 nm for Cr, 100–4000 nm for Zn, 25–100 nm for Co and 40–660 nm for Cu were deposited. The compositions, purity and size of the cathode deposits were confirmed by scanning electron microscopy and energy-dispersive X-ray spectroscopy. Presented metal recovery method is a promising technique for industrial application, given its simplicity, economic viability and environmental sustainability. It can be used on a wide range of solutions and help in reducing the problem of the growing amounts of industrial wastewater.

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Wastewater treatment: a case study of electronics manufacturing industry

Cited by 12 publications

References 32 publications

Harnessing Photoelectrochemistry for Wastewater Nitrate Treatment Coupled with Resource Recovery

Harnessing Photoelectrochemistry for Wastewater Nitrate Treatment Coupled with Resource Recovery

An Assessment of Zinc Fluxes by Analyzing Monthly, Weekday, and Weekend Levels in a River

The recovery of metals as high value powders and nanopowders from industrial wastewaters using potential-controlled electrolysis

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