Wet Air Oxidation of Aqueous Wastes

Tungler, Antal; Szabados, Erika; Hosseini, Arezoo

doi:10.5772/60935

Cited by 13 publications

(3 citation statements)

References 93 publications

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“…We did not apply the wet oxidation (WO) technique that can be used to estimate the carbon content of the solid organic materials, including plant materials, even though this is a more correct technique [50,51]. WO is a pretreatment technique, which uses water and air or oxygen to fractionate biomass at temperature above 120 • C. To the authors' knowledge, no studies have used the WO technique to estimate carbon stocks of forest at a large scale, as this is a sophisticated laboratory-based technique requiring tremendous amount of resources, and thus applicable only to a small sample.…”

Section: Discussionmentioning

confidence: 99%

Effects of Forest Management Approach on Carbon Stock and Plant Diversity: A Case Study from Karnali Province, Nepal

Lamsal,

Aryal,

Adhikari

et al. 2023

Land

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The mitigation of global warming and conservation of biodiversity are two significant environmental challenges today. Estimating and comparing forest carbon stock and plant diversity under different management approaches provide insight into the choice of management approaches for carbon and plant diversity management. We investigated the variation in carbon stock and diversity of plant species in two forest managements under different approaches: the Kakrebihar protection forest (PF) and Sano Surkhet community forest (CF) in Karnali Province, Surkhet, Nepal. In total, 63 sample plots (30 plots in PF and 33 plots in CF) were laid out systematically across the forests. Dendrometric measurements were carried out for trees, poles, and saplings, and representative leaf litter and herb samples were collected. Soil samples were taken at 10 cm, 20 cm, and 30 cm depths using a soil auger. The existing tree volume equations of tree species of interest were used to estimate tree volume, and species-specific wood density and conversion factors were used to obtain total biomass and carbon content. Soil samples were analyzed using the Walkley-Black method to determine soil organic carbon. PF had higher carbon stock, plant species richness, and abundance at the landscape level than CF; however, the scenario differed at the plot level. At the plot level, PF had significantly higher total carbon stock and biomass carbon stock than CF. However, PF and CF were statistically indistinguishable in term of soil carbon stock. At the plot level, PF and CF were statistically indistinguishable regarding richness, Simpson diversity, and Shannon diversity, but PF had significantly higher plant abundance than CF. In conclusion, the value of PF for carbon stock and plant diversity surpassed those of CF. This study suggests that PF might be a better strategy to enhance carbon stock in forests and maintain habitat for various plant species.

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Section: Discussionmentioning

confidence: 99%

Effects of Forest Management Approach on Carbon Stock and Plant Diversity: A Case Study from Karnali Province, Nepal

Lamsal,

Aryal,

Adhikari

et al. 2023

Land

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show abstract

“…In contrast, microorganisms in biological methods are sensitive to toxic substances, and pre-treatment before biological treatment is required. Most of the mentioned methods do not degrade the contaminants but only transfer them to another phase, so CECs are still present in the environment (Tungler et al, 2015;De Gisi et al, 2016;Obotey Ezugbe & Rathilal, 2020).…”

Section: Visible Light-driven Advanced Oxidation Processesmentioning

confidence: 99%

Visible Light–Driven Advanced Oxidation Processes to Remove Emerging Contaminants from Water and Wastewater: a Review

Zawadzki

2022

Water Air Soil Pollut

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The scientific data review shows that advanced oxidation processes based on the hydroxyl or sulfate radicals are of great interest among the currently conventional water and wastewater treatment methods. Different advanced treatment processes such as photocatalysis, Fenton’s reagent, ozonation, and persulfate-based processes were investigated to degrade contaminants of emerging concern (CECs) such as pesticides, personal care products, pharmaceuticals, disinfectants, dyes, and estrogenic substances. This article presents a general overview of visible light–driven advanced oxidation processes for the removal of chlorfenvinphos (organophosphorus insecticide), methylene blue (azo dye), and diclofenac (non-steroidal anti-inflammatory drug). The following visible light–driven treatment methods were reviewed: photocatalysis, sulfate radical oxidation, and photoelectrocatalysis. Visible light, among other sources of energy, is a renewable energy source and an excellent substitute for ultraviolet radiation used in advanced oxidation processes. It creates a high application potential for solar-assisted advanced oxidation processes in water and wastewater technology. Despite numerous publications of advanced oxidation processes (AOPs), more extensive research is needed to investigate the mechanisms of contaminant degradation in the presence of visible light. Therefore, this paper provides an important source of information on the degradation mechanism of emerging contaminants. An important aspect in the work is the analysis of process parameters affecting the degradation process. The initial concentration of CECs, pH, reaction time, and catalyst dosage are discussed and analyzed. Based on a comprehensive survey of previous studies, opportunities for applications of AOPs are presented, highlighting the need for further efforts to address dominant barriers to knowledge acquisition.

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“…amine content and 36 g/L of TSS. These characteristics allow classify this process stream as a hazardous waste and make it difficult to handle and treat [8,11,[36][37][38][39].…”

Section: Characterisation Of Spent Caustic Wastewater From Refinerymentioning

confidence: 99%

Increasing Biodegradability of a Real Amine-Contaminated Spent Caustic Problematic Stream Through Wao and Cwao Oxidation Using a High Specific Surface Catalyst from Petcoke

González¹,

Pariente

Molina

et al. 2022

SSRN Journal

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Wet Air Oxidation of Aqueous Wastes

Cited by 13 publications

References 93 publications

Effects of Forest Management Approach on Carbon Stock and Plant Diversity: A Case Study from Karnali Province, Nepal

Effects of Forest Management Approach on Carbon Stock and Plant Diversity: A Case Study from Karnali Province, Nepal

Visible Light–Driven Advanced Oxidation Processes to Remove Emerging Contaminants from Water and Wastewater: a Review

Increasing Biodegradability of a Real Amine-Contaminated Spent Caustic Problematic Stream Through Wao and Cwao Oxidation Using a High Specific Surface Catalyst from Petcoke

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