Development of UV/Persulfate based laboratory-scale continuous-flow leachate treatment system

Ishak, Ahmad Razali; Khor, Soo Wei; Mohamad, Sharifah; Tay, Kheng Soo

doi:10.1016/j.eti.2021.102065

Cited by 6 publications

(2 citation statements)

References 35 publications

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“…Moreover, similarly to our work, the decrease in the flow rate from 1.2 mL min −1 to 0.4 mL min −1 improved the dye degradation from 10% to 60% [60]. On the contrary, Ishak et al used the lab-scale continuous flow UV/PS system for the landfill leachate treatment and found no significant difference in COD removal between the flow rates of 50 mL min −1 and 100 mL min −1 [48]. The authors reported that about 70% removal of COD was achieved at the flow rate of 50 mL min, PS of 12 mM, pH of 6, and reaction time of 10 h. In another study, utilizing persulfate oxidation in a continuous flow 3D electrode dynamic reactor, Yu and Pei treated landfill leachate [61].…”

Section: Optimization Of the Continuous Flow Uv/ps/zvi Processsupporting

confidence: 84%

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UV and Zero-Valent Iron (ZVI) Activated Continuous Flow Persulfate Oxidation of Municipal Wastewater

et al. 2022

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Currently, sulfate-radical-based advanced oxidation processes are promising candidates to become viable post-treatment processes for wastewater purification. In this work, a continuous flow UV light/persulfate (PS)/zero-valent iron (ZVI) system has been applied for wastewater treatment for the first time. The influence of certain photo-Fenton-like process parameters, such as space time, PS concentration, and PS to ZVI molar ratio, on the removal of total organic carbon (TOC), was examined using the Box–Behnken design. First, synthetic municipal wastewater was used for the experiments, and the polynomial regression model was constructed utilizing the real data by using the response surface methodology (RSM). The adequacy of the RSM model was assessed by analysis of variance, which showed that the model was reliable and could be applied to improve the process parameters for TOC removal. Moreover, both synthetic and real municipal wastewater were spiked with carbamazepine (CBZ), which is commonly prescribed as an antiepileptic drug, to investigate its fate in the UV/PS/ZVI system. With a space time of 60 min, PS concentration of 60 mM, and PS to ZVI molar ratio of 15, it was possible to remove 71% of TOC and completely remove CBZ from the synthetic municipal wastewater, whereas a 60% TOC removal and complete removal of CBZ were achieved at a space time of 50 min, PS concentration of 50 mM, and PS/ZVI molar ratio of 15 for the real municipal wastewater. This difference in TOC removal could possibly be linked to the complex matrix of the real wastewater and the presence of radical scavenging agents.

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Section: Optimization Of the Continuous Flow Uv/ps/zvi Processsupporting

confidence: 84%

“…In addition, batch photochemical reactors provide ideal conditions for the heterogenous process, but these conditions are far from real as they require additional steps increasing the cost of the process [47]. Therefore, the use of continuous flow systems is an essential step toward upscaling the process [48].…”

Section: Introductionmentioning

confidence: 99%