Comparison of ozonation removal for PPCPs in secondary treated sewage by microbubble generator and ejector

Abstract

This study analyzed residues of PPCPs in secondary treated sewage water, and their amount eliminated by ozonation processes. A microbubble nozzle and ejector were used to dissolve ozone. To consider a low concentration of PPCPs, a SPE method was performed on samples prior to the analysis. The concentration of dissolved ozone was 4.00 mg/L in the microbubble and 2.49 mg/L in the ejector. To examine elimination trends, the experiment was also performed at a low concentration of ozone, 1/10 of its original concentration. The maximum elimination rate on average was 93.0% in the ejector, higher than that in the microbubble (90.1%), but 16 PPCPs were found to show a relatively high elimination rate in the microbubble, higher than the ejector. Elimination trends with respect to time were distinguished based on inflection point, and 11 PPCPs were concentrated on the latter half of the microbubble after the inflection point at the low concentration of ozone, which was compared to other cases. In the source water, concentrations of 2 PPCPs were higher than the reference toxic concentration based on the QSAR model, but after treatment, only bezafibrate was over the value when the ejector with low ozone injection concentration was applied.

Elimination of DOC in RO concentrate from a wastewater reclamation plant: Cost comparison of different AOPs

“…Advanced oxidation processes (AOPs) are known to generate hydroxyl radical (･OH), which is a strong oxidant capable of oxidizing a wide spectrum of organic compounds in water [9][10][11]. AOPs have been studied for treating the residual organic compounds in RO concentrate [12][13][14][15][16][17][18][19][20].…”

Effect of Power Pump and Nozzle Diameter Microbubble Generator to Increase Oxygen Concentration in Aquaculture

“…MBG can produce micro-sized bubbles (Deendarlianto et al, 2015;Rizaldi et al, 2019) and accelerate to increase DO concentration (Jeon et al, 2018;Rahmawati et al, 2021), and save energy (Parmar & Majumder, 2013). There are various methods for generating a microbubble technology: Using venturi (Dey et al, 2020;Huang et al, 2021;Wilson et al, 2021;Yadav et al, 2019), using Nozzle (Alam et al, 2018;Ferrando et al, 2021;Khan et al, 2020;Kim & Lee, 2021;Lee et al, 2019;Lin et al, 2018;Wu et al, 2021), using Orifice (Basso et al, 2018;Daskiran et al, 2019;Deendarlianto et al, 2015;Juwana et al, 2019;Kataoka et al, 2020;Liew et al, 2020;Miao et al, 2021;Morito & Makuta, 2018;Rizaldi et al, 2019;Sadatomi et al, 2012), and used DAF Kiuru, 2001). However, various microbubbles have a reasonably small dimension size, and some use compressors or blowers for air distribution.…”