scholarly journals Removal of natural organic matter in waters using hydrodynamic cavitation and hydrogen peroxide (HC-H2O2)

2020 ◽  
Vol 24 ◽  
pp. e29
Author(s):  
Matheus Neves de Araujo ◽  
Thiago Vinicius Ribeiro Soeira ◽  
Cristiano Poleto ◽  
Elias Gabriel Fernandes de Rezende ◽  
Otávio Augusto Puglieri Cappa ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Advanced Oxidation Process ◽  
Reaction Medium ◽  
Molecular Structures ◽  
Hydrodynamic Cavitation ◽  
Acidic Ph ◽  
Early 21St Century ◽  
Supply Water

The presence of natural organic matter (NOM) in water does not present direct risk to the human body or to the environment. However, its presence along with other pollutants can lead to countless issues and damage human health and the environment. The hydrodynamic cavitation (HC) phenomenon started being used in the early 21st century as a process capable of treating supply-water and wastewater based on pollutant and pathogen degradation. Process effectiveness increases when it is combined to chemical agents, creating an advanced oxidation process (AOP). Although several studies have presented broaden applications for the HC process, its use for NOM removal from supply-water was not yet assessed; therefore, it remains a gap in scientific knowledge. The aim of the current study is to assess HC potential in NOM removal. In order to do so, the experiments were carried out in bench scale hydrodynamic cavitation system operated at batch model within 15-min duration period-of-time. In addition, decantation experiments (24-h period-of-time) were performed in order to check HC influence on molecules found in reaction medium after the exposure of NOM to the phenomenon. NOM was produced by a synthetic humic acid (HA) matrix at fixed concentration of 100 ppm. In total, 16 experiments were carried out; each experiment was featured by the following pair: pH (2.6, 3.0, 3.5 and 5.5) and hydrogen peroxide (0, 1, 5 and 30 mL). The best removal efficiencies (34%-36%) were observed in the most acidic pH ranges (2.6-3.0) at H2O2 concentration of 15mL. Results have presented high NOM removal efficiency (approximately 90%) after decantation at the most acidic pH ranges, as well. It can be explained by the fact that hydrodynamic cavitation in acid solution can break molecular structures suspended in the liquid medium, which favors decantation. Based on the present study, hydrodynamic cavitation with hydrogen peroxide addition can remove NOM from water; moreover, pH control is an essential factor for process development.

scholarly journals Lability of natural organic matter in freshwater: a simple method for detection using hydrogen peroxide as an indicator

2018 ◽  
Author(s):  
Isabela Carreira Constantino ◽  
Amanda Maria Tadini ◽  
Marcelo Freitas Lima ◽  
Lídia Maria de Almeida Plicas ◽  
Altair Benedito Moreira ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Organic Carbon ◽  
Natural Organic Matter ◽  
Water Samples ◽  
Ultrapure Water ◽  
Model Compounds ◽  
Simple Method ◽  
The Difference ◽  
One Year

Abstract. Natural organic matter (NOM) is an important component for understanding the behavior of pollutants in the environment. A fraction of NOM is considered labile, fresh and less oxidized. In this work, a simple method was developed to distinguish between labile (LOM) and recalcitrant (ROM) organic matter in freshwater samples. Pyruvate, lignin and fulvic acid were chosen as model compounds of labile and recalcitrant NOM. The samples were submitted to kinetic monitoring experiments using hydrogen peroxide. Pyruvate was the best standard for the quantification of LOM (for concetrations up to 2.9 mg L−1). ROM was quantified by measuring the difference between total organic carbon (TOC) and LOM concentrations. Curves obtained with 0.5 to 5.0 mg L−1 TOC (pyruvate) in freshwater or ultrapure water samples did not indicate the existence of a matrix effect. This simple method was applied to water samples that were collected monthly for one year; the resulting LOM concentrations ranged from 0.47 to 2.1 mg L−1 and the ROM concentrations ranged from 0.08 to 3.5 mg L−1. Based on this results we concluded that hydrogen peroxide kinetics can be used as a simple method to quantify LOM and ROM concentrations in freshwater samples.

Photochemical production of hydrogen peroxide from natural algicides: decomposition organic matter from straw

2015 ◽  
Vol 17 (8) ◽  
pp. 1455-1461 ◽  
Author(s):  
Hua Ma ◽  
Jie Zhang ◽  
Liyin Tong ◽  
Jixiang Yang
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Wheat Straw ◽  
Natural Organic Matter ◽  
Solar Irradiation ◽  
Photochemical Production ◽  
Production Of Hydrogen ◽  
Simulated Solar Irradiation

The ability of decomposition organic matter from three natural algicides (barley, rice, and wheat straw) and natural organic matter (NOM) isolates to generate hydrogen peroxide under simulated solar irradiation was evaluated in order to understand the mechanism of indirect algae inhibition through a photochemical pathway.

Biofilm control in water by advanced oxidation process (AOP) pre-treatment: effect of natural organic matter (NOM)

2011 ◽  
Vol 64 (9) ◽  
pp. 1876-1884 ◽  
Author(s):  
Anat Lakretz ◽  
Eliora Z. Ron ◽  
Tali Harif ◽  
Hadas Mamane
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Biofilm Formation ◽  
Natural Waters ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Post Treatment ◽  
Control Effect ◽  
Biofilm Control

The main goal of this study was to examine the influence of natural organic matter (NOM) on the efficiency of H2O2/UV advanced oxidation process (AOP) as a preventive treatment for biofilm control. Pseudomonas aeruginosa PAO1 biofilm-forming bacteria were suspended in water and exposed to various AOP conditions with different NOM concentrations, and compared to natural waters. H2O2/UV prevented biofilm formation: (a) up to 24 h post treatment – when residual H2O2 was neutralized; (b) completely (days) – when residual H2O2 was maintained. At high NOM concentrations (i.e. 25 mg/L NOM or 12.5 mg/L DOC) an additive biofilm control effect was observed for the combined H2O2/UV system compared to UV irradiation alone, after short biofilm incubation times (<24 h). This effect was H2O2 concentration dependent and can be explained by the high organic content of these water samples, whereby an increase in NOM could enhance •OH production and promote the formation of additional reactive oxygen species. In addition, maintaining an appropriate ratio of bacterial surviving conc.: residual H2O2conc. post-treatment could prevent bacterial regrowth and biofilm formation.

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