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Controlling cyanotoxin occurrence
Published in Ingrid Chorus, Martin Welker, Toxic Cyanobacteria in Water, 2021
Gayle Newcombe, Lionel Ho, José Capelo Neto
In general, UV irradiation, as applied for disinfection of drinking-water, cannot be regarded as a practical method for an effective toxin removal. However, the combination of UV irradiation and catalysts such as hydrogen peroxide and titanium dioxide can be very effective for the destruction of dissolved toxins. These processes, and others that rely on the formation of hydroxyl radicals for the oxidation of chemical contaminants, are referred to as advanced oxidation processes (AOPs). A range of AOPs has been the focus of more recent research. In most cases, oxidation is very effective, but each process depends on the type and concentration of the catalyst, the chemical characteristics of the water and the type of toxin. The application of these processes is therefore very site and process specific. Table 10.6 presents some of the advanced oxidation techniques that have been studied for the destruction of cyanotoxins.
Advanced oxidation processes, membrane separation processes, and environmental engineering techniques: A vision for the future and a critical overview
Published in A. K. Haghi, Lionello Pogliani, Devrim Balköse, Omari V. Mukbaniani, Andrew G. Mercader, Applied Chemistry and Chemical Engineering, 2017
A wide variety of recalcitrant organic compounds is found in indus trial and municipal wastewater. Some of these compounds (both synthetic organic chemicals and naturally occurring substances) pose severe prob lems and unmitigated challenges in biological treatment systems due to their resistance to biodegradation or/and toxic effects on microbial processes. As a result, the use of alternative treatment technologies, aiming to mineralize or transform refractory molecules into others that could be further degraded, is a matter of deep comprehension. Among them, advanced oxidation processes (AOPs) have already been used for the treatment of wastewater containing recalcitrant compounds such as pesticides, surfactants, coloring matters, pharmaceuticals, and endocrine-disrupting chemicals. Moreover, they have been successfully and effectively used as pretreatment methods in order to reduce the concentrations of toxic organic compounds that prevent biological wastewater treatment. The success and the purpose of this well informed treatise go beyond visionary boundaries of scientific and techno logical frontiers. The author pointedly focuses on the future of separation processes and the successful realization of environmental sustainability.30–33
Microalgae-Based Bioremediation of Refractory Pollutants in Wastewater
Published in Maulin P. Shah, Removal of Refractory Pollutants from Wastewater Treatment Plants, 2021
Ayesha Algade Amadu, Shuang Qiu, Abdul-Wahab Abbew, Mohammed Zeeshan Qasim, Lingfeng Wang, Zhipeng Chen, Yeting Shen, Zhengshuai Wu, Shijian Ge
Several conventional technologies, such as the advanced oxidation process (AOP), are currently being used to remove these toxic refractory pollutants from wastewater. The AOP removes refractory pollutants from wastewater due to the low oxidation selectivity and high reactivity of the radicals (Srivastav et al. 2018). However, most of the methods involved in AOPs are effective at acidic and neutral pH levels, like the Fenton process, but in many instances, industrial pollutants are formed at basic pH conditions and can thus be effectively treated through biological methods, like microalgae bioremediation. Microalgae bioremediation involves metabolic and passive processes such as biouptake, bioaccumulation, biosorption, ion exchange, surface complexation, and precipitation.
Photo-Fenton process applied for the treatment of industrial wastewaters containing diclofenac: optimization with low iron ions concentrations and without pH control
Published in Journal of Environmental Science and Health, Part A, 2023
Rafael Gonçalves Miele, Joyce Ferreira de Carvalho, Juliana de Almeida, Isaac Henrique Molina de Oliveira, Barbara de França Parise, José Ermírio Ferreira de Moraes
In general, in addition to the serious environmental effects caused by drugs, these substances are often not adequately removed by conventional water and wastewater treatment plants.[2,8,10,21,22] So, it is very important the development of alternative technologies for the treatment of wastewaters containing pharmaceuticals. Among the most studied methods, advanced oxidation processes (AOP) stand out, because these technologies can generate free radicals, which are highly reactive chemical species, such as hydroxyl radicals (). These species are able to oxidize many toxic organic pollutants with significant reaction rates (106 - 109 mol L−1 s−1) and high standard reduction potential (2.80 V).[23–25]
Development of Ag/Ag2O/ZnO photocatalyst and their photocatalytic activity towards dibutyl phthalate decomposition in water
Published in Journal of the Air & Waste Management Association, 2022
Erisa Sugiura, Mai Furukawa, Ikki Tateishi, Hideyuki Katsumata, Satoshi Kaneco
The research works on new treatment methods to remediate the recalcitrant compound have been actively investigated. Nowadays, advanced oxidation processes (AOP) are very appealing, due to the generation of highly oxidizing hydroxyl radicals. Among these processes, the photocatalytic treatment is especially suitable, since it cannot require the handling of expensive chemicals such as H2O2. Therefore, the photocatalytic degradation can be easily operated. In order to maximize photocatalytic performance, various semiconductor photocatalysts (ZnO (Khavar et al. 2019), CdS (Lei et al. 2020), CeO2 (Montini et al. 2016) and TiO2 (Fulekar et al. 2018; Katal et al. 2019; Shayegan, Lee, and Haghighat 2018)) have been widely explored in recent decades. Here, the present study has focused on the photocatalytic degradation of DBP with Zn-based photocatalyst and the mechanism of increased activity.
Attenuation of organics contamination in polymers processing effluent using iron-based sludge: process optimization and oxidation mechanism
Published in Environmental Technology, 2022
Wastewater creates a major ecological problem through the worldwide and need a successful cleaning prior to the final discharge into the environment [7–9]. Water reuse is considered a promising option for water deficiency; however, searching for reliable and cost-efficient technologies is a research topic. Different physical [10–12], biological [13] and chemical [14,15] conventional techniques are previously applied to get wastewater rid from toxic substances. Recently, advanced oxidations processes [16,17] have been applied for wastewater treatment. Up to date, using existing treatment technologies for water reclamation need to be comparatively improved to make it reusable [18]. For meeting water quality criteria with an efficient cost, advanced treatment should be applied for better water management. Among the treatment technologies, advanced oxidation processes (AOPs) are considered promising technologies since they are mineralizing the pollutants to harmless end products without transferring them into another phase. Thus, they are cost-efficient technologies, available and simple in managing [19].