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All Journal Indonesian Journal of Chemistry Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia
Veny Luvita, Veny
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Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Engineering Environmental Science Industrial & Manufacturing Engineering

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Ozone Plasma Nanobubble (OPN) Reactor Combined with Coagulation-Flocculation Process: A Promising Technology for Leachate Treatment Zahra, Habiibatuz; Azzahra, Ken; Putri, Azizka Inneke; Luvita, Veny; Bismo, Setijo
Indonesian Journal of Chemistry Vol 24, No 5 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.94559

Abstract

According to World Bank data, approximately 2.01 billion tons of urban waste is produced annually, with approximately 33% of waste being improperly managed, leading to concentrated and toxic leachate. This poses a global challenge due to its varied characteristics influenced by climate, landfill age, and waste composition, resulting in groundwater and surface water pollution with severe impacts on human health, ecosystems, and biodiversity, necessitating stringent treatment measures. To address this, a study integrated coagulation-flocculation and advanced oxidation processes (AOPs) using a dielectric barrier discharge (DBD) ozone plasma nanobubble (OPN) reactor to degrade leachate. Gas flow rate, plasma voltage, and gas sources are variated. This research uses O2 or air as a gas source that produces plasma. The leachate is fed into the DBD reactor, so the bubble will burst and produce further ROS. Optimal results were observed after 60 min, with oxygen gas feed reducing total suspended solids (TSS), chemical oxygen demand (COD), and biological oxygen demand (BOD) by 100, 93.93, and 74.12%, respectively, alongside a decrease in pH. This study indicates the promising potential of this technology for leachate treatment and demonstrates the potential for nitrate production using both types of gas feed.
The Effect of pH on Methylene Blue Removal Efficiency at Different Ozonation Times Adhiksana, Arief; Irwan, Muh; Luvita, Veny; Harjanto, Harjanto; Patmawati, Yuli; Megawati, Eka; Vegatama, Meita Rezki; Ulfa, Elis Diana; Maulidyawati, Putri; Julianty, Rachma Sherlyn
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 11, No 1 (2026): EDISI MARET 2026
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v11i1.7788

Abstract

The textile industry has experienced growth over time, and methylene blue (MB) is one of the most frequently utilized dyes. Methylene Blue impacts human health in various ways, including causing skin irritation and systemic effects like changes in blood composition. Thus, ozonation is an alternative method for treating MB wastewater. This study aimed to investigate the effects of reaction time and pH conditions on MB degradation through ozonation. Compared with traditional treatment methods, which often result in the production of by-products, ozonation is regarded as a more environmentally sustainable approach for wastewater treatment. In this study, MB was prepared at an initial concentration of 50 mg/L, with a sample volume of 500 mL, at 25°C. The variations included reaction times of 10 and 20 min and pH levels of 3, 5, 7, 9, and 11. Ozonation was performed using an ozone generator with a flow rate of 200 mg/h. The ozonation results were analyzed using a UV-VIS spectrophotometer at a wavelength of 665 nm for MB. The results demonstrated that optimal performance was achieved at a pH of 7 with a reaction time of 20 minutes, resulting in a final concentration of 0.49 mg/L. This corresponded to a significant 99% removal of MB.
Co-Authors Arief Adhiksana Azzahra, Ken HARJANTO HARJANTO Julianty, Rachma Sherlyn Maulidyawati, Putri Megawati, Eka Muh Irwan, Muh Patmawati, Yuli Putri, Azizka Inneke Setijo Bismo Ulfa, Elis Diana Vegatama, Meita Rezki Zahra, Habiibatuz