Advanced oxidation process: a sustainable technology for treating refractory organic compounds present in industrial wastewater

“…Increasing wastewater discharges from various sources pose enormous environmental challenges worldwide. 1 Due to rapid industrial growth, the environment has become highly contaminated with various organic and inorganic pollutants. 2,3 Dyes are common hazardous organic contaminants in wastewater.…”

Section: Introductionmentioning

confidence: 99%

The mechanism of water pollutant photodegradation by mixed and core–shell WO₃/TiO₂ nanocomposites

Habtamu

Ujihara

2023

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…However, high investment and operating costs, susceptibility to sludge swelling, and long pre-preparation cycles are the issues that exist in biological treatment processes [9]. Therefore, alternative and more advanced techniques are required [6,10]. Advanced oxidation processes (AOPs), an emerging wastewater treatment technology, displays great potential for the degradation of a variety of organic contaminants [2].…”

Section: Introductionmentioning

confidence: 99%

Turbidity and COD Removal from Municipal Wastewater Using a TiO2 Photocatalyst—A Comparative Study of UV and Visible Light

et al. 2023

View full text Add to dashboard Cite

Water resources are depleting, and the availability and supply of clean, potable water are a global concern. Advanced oxidation processes (AOPs) possess immense prospects in water and wastewater treatment settings. This study investigated and optimized the photocatalytic treatment of wastewater using titanium dioxide (TiO2) as the photocatalyst. The one-factor-at-a-time (OFAT) technique was employed to evaluate the effects of reaction time (20–100 min), mixing speed (20–100 rpm), and catalyst load (0.3–1.5 g/L) on pH, colour, turbidity, and chemical oxygen demand (COD) removal from actual municipal wastewater. Reaction time and catalyst load were then identified as the two key factors selected to be modeled and were optimized for turbidity and COD removal using the Central Composite Design (CCD) of response surface methodology (RSM). These statistical models were developed and used to optimize the operating conditions. The results obtained showed a desirability efficiency of 74.7% at a 95% confidence level. The RSM model predicted results at the optimum conditions and showed reasonable agreement with the experimental results obtained. The optimal responses achieved were 32.64% COD removal and 95.17% turbidity removal. A comparative study between UV light and visible light was also conducted at optimum conditions, whereby the UV light was demonstrated to be highly effective for turbidity and COD removal. The optimal responses achieved were 25.58% COD removal and 66.88% turbidity removal for visible light.

show abstract

“…Thus, alternative technologies characterized by enhanced sustainability must be exploited. Advanced oxidation processes (AOPs) may be implemented to mineralize refractory pollutants, such as those present in secondary P&P effluents, improving in addition wastewater biodegrad-ability (i.e., BOD/COD ratio) [22]. Several AOPs have been successfully applied in recent years to P&P WW, including ozone [23], Fenton and photo-Fenton [24], electrochemical oxidation [25,26].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Alternatives for Tertiary Treatment of Pulp and Paper Wastewater

et al. 2022

View full text Add to dashboard Cite

In this work, different alternatives to conventional tertiary treatment of pulp and paper (P&P) wastewater (WW), i.e., physicochemical coagulation-flocculation, were investigated to enhance the environmental and economic sustainability of industrial wastewater treatment. In particular, following a preliminary characterization of secondary effluents, cloth filtration and adsorption were studied, the former by pilot-scale tests, while the latter at laboratory scale. An economic analysis was finally accomplished to verify the full-scale applicability of the most promising technologies. Cloth filtration showed excellent total suspended solids (TSS) removal efficiency (mean 81% removal) but a very limited influence on chemical oxygen demand (COD) (mean 10% removal) due to the prevalence of soluble COD on particulate COD. Adsorption, instead, led to a good COD removal efficiency (50% abatement at powdered activated carbon—PAC—dosage of 400 mg/L). The economic analysis proved that adsorption would be convenient only if a local low-cost (100 €/ton) adsorbent supply chain was established. Ultrafiltration was considered as well as a potential alternative: its huge capital cost (19 M€) could be recovered in a relatively short timeframe (pay-back time of 4.7 years) if the ultrafiltrated effluent could be sold to local industries.

show abstract

Advanced oxidation process: a sustainable technology for treating refractory organic compounds present in industrial wastewater

Cited by 68 publications

References 176 publications

The mechanism of water pollutant photodegradation by mixed and core–shell WO₃/TiO₂ nanocomposites

The mechanism of water pollutant photodegradation by mixed and core–shell WO₃/TiO₂ nanocomposites

Turbidity and COD Removal from Municipal Wastewater Using a TiO2 Photocatalyst—A Comparative Study of UV and Visible Light

Sustainable Alternatives for Tertiary Treatment of Pulp and Paper Wastewater

Contact Info

Product

Resources

About

Advanced oxidation process: a sustainable technology for treating refractory organic compounds present in industrial wastewater

Cited by 68 publications

References 176 publications

The mechanism of water pollutant photodegradation by mixed and core–shell WO3/TiO2 nanocomposites

The mechanism of water pollutant photodegradation by mixed and core–shell WO3/TiO2 nanocomposites

Turbidity and COD Removal from Municipal Wastewater Using a TiO2 Photocatalyst—A Comparative Study of UV and Visible Light

Sustainable Alternatives for Tertiary Treatment of Pulp and Paper Wastewater

Contact Info

Product

Resources

About

The mechanism of water pollutant photodegradation by mixed and core–shell WO₃/TiO₂ nanocomposites

The mechanism of water pollutant photodegradation by mixed and core–shell WO₃/TiO₂ nanocomposites