Removal of COD and color from textile industrial effluents using different carbonaceous materials modified with acids, salts, and hydrogen peroxide

2020 ◽  
Vol 184 ◽  
pp. 1-14
Author(s):  
Juana Díaz de León Chiquito ◽  
Rigoberto Tovar Gómez ◽  
Ma. del Rosario Moreno Virgen ◽  
Carlos Javier Durán Valle ◽  
María Ana Pérez Cruz
Keyword(s):  
Hydrogen Peroxide ◽  
Industrial Effluents ◽  
Carbonaceous Materials

Relation between the activity of electrodes from various carbonaceous meterials for reduction of oxygen to hydrogen peroxide and concentration of their paramagnetic centers

1980 ◽  
Vol 45 (12) ◽  
pp. 3249-3253 ◽  
Author(s):  
Jan Balej ◽  
Karel Balogh ◽  
Pavel Stopka ◽  
Otomar Špalek
Keyword(s):  
Hydrogen Peroxide ◽  
Alkali Metal ◽  
Porous Electrodes ◽  
Substantial Decrease ◽  
Current Yield ◽  
Paramagnetic Centers ◽  
Carbonaceous Materials

The current yield of hydrogen peroxide during cathodic readuction of oxygen in porous electrodes from various carbonaceous materials is the lower the higher is the number of paramagnetic centers in these materials. A substantial decrease in the concentration of paramagnetic centers by heating to 900 °C in vacuum is only temporary, whereas by heating with alkali metal sulphides it is practically permanent.

Microbicidal efficacy of an advanced oxidation process using ozone/hydrogen peroxide in water treatment

2004 ◽  
Vol 50 (1) ◽  
pp. 159-164 ◽  
Author(s):  
R. Sommer ◽  
W. Pribil ◽  
S. Pfleger ◽  
T. Haider ◽  
M. Werderitsch ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Hydrogen Peroxide ◽  
Bacillus Subtilis ◽  
Water Treatment ◽  
Contact Time ◽  
Advanced Oxidation Process ◽  
Advanced Oxidation ◽  
Industrial Effluents ◽  
Ozone Treatment ◽  
Combined Application

The combined application of ozone and hydrogen peroxide represents a kind of advanced oxidation for water treatment. The radicals that are generated during the process are used for the degradation of organic pollutants from groundwater and industrial effluents. The aim of our study was to evaluate the possible microbicidal, and particularly virucidal, efficacy of such a process, since no substantial data were available. The investigations were performed at a pilot plant installed for the elimination of perchloroethylene from polluted groundwater (reduction efficacy for perchloroethylene from 26 mg/L to 5 mg/L). To enable a reliable evaluation of the microbicidal effect, a set of alternate test organisms was used. As model viruses we chose bacteriophages MS2 (F+ specific, single-stranded RNA), ΦX174 (single-stranded DNA) and PRD-1 (coated, double-stranded DNA). Furthermore, spores of Bacillus subtilis were included as possible surrogates for protozoa and Escherichia coli as representative for traditional indicator bacteria used in water analysis. The microbicidal efficiency was compared to the inactivation by means of ozone under two standard conditions (20°C): (a) 0.4 mg/L residual after 4 min and (b) 0.1 mg/L residual after 10 min. Surprisingly, a good microbicidal effect of the ozone/hydrogen peroxide process was found. This was somewhat unexpected, because we had assumed that the disinfection potential of ozone would have been interfered with by the presence of hydrogen peroxide. Escherichia coli and the three test viruses revealed a reduction of about 6-log. In contrast, spores of Bacillus subtilis showed after the total process a reduction of 0.4-log. These results matched the effect of the ozone treatment (a) with a residual of 0.4 mg/L after 4 min contact time (20°C). The test condition (b) with a residual of 0.1 mg/L ozone after a contact time of 10 min at 20°C gave a higher reduction of the B. subtilis spores (1.5-log). The presented study revealed a satisfying microbicidal efficacy of the ozone/hydrogen peroxide process with respect to vegetative bacteria and viruses (bacteriophages). However, it has to be emphasised that intense mixing and sufficient contact time have to be optimised and tested for each individual installation.

scholarly journals Activated Persulfate and Hydrogen Peroxide Treatment of Highly Contaminated Water Matrices: A Comparative Study

2020 ◽  
Vol 11 (12) ◽  
pp. 549-554
Author(s):  
Niina Dulova ◽  
◽  
Eneliis Kattel ◽  
Marina Trapido
Keyword(s):  
Hydrogen Peroxide ◽  
Industrial Effluents ◽  
Organic Load ◽  
Foam Formation ◽  
Treatment Technology ◽  
Hydrogen Peroxide Treatment ◽  
Pollutants Removal ◽  
Wastewater Samples ◽  
Mature Landfill Leachate ◽  
Activated Persulfate

The efficacy of Fe2+-activated persulfate (PS) and hydrogen peroxide (HP) treatment in total organic load and selected organic pollutants removal from different highly polluted industrial effluents was evaluated and compared. The studied wastewater samples involved a paint production wastewater (S1), phenolic wastewater (S2) and mature landfill leachate (S3). The coagulation proved an effective technique to pre-treat S1, and thus to reduce substantially the amount of chemicals required in the subsequent oxidation step. The Fenton treatment (HP/Fe2+) proved more effective S1 post-treatment technology than the PS/Fe2+ process and resulted in substantial COD and DOC removal as well as in considerable the BOD7/COD ratio increase. In the case of S2 and S3, the application of Fenton process also demonstrated higher total organic load removal efficacy than the PS/Fe2+ system. Conversely, the HP/Fe2+ oxidation was characterized by a temperature increase and excessive foam formation. The findings of this study provide valuable information for further full-scale applications of Fe2+-activated HP and PS based processes for the treatment of highly contaminated wastewater with the most effective concentrations of reagents used.

Habitat Association of Klebsiella Species

1985 ◽  
Vol 6 (2) ◽  
pp. 52-58 ◽  
Author(s):  
Susan T. Bagley
Keyword(s):  
Drinking Water ◽  
Gastrointestinal Tract ◽  
Surface Waters ◽  
Industrial Effluents ◽  
Opportunistic Pathogen ◽  
Habitat Associations ◽  
Habitat Association ◽  
Klebsiella Species ◽  
Almost All ◽  
Polluted Waters

AbstractThe genus Klebsiella is seemingly ubiquitous in terms of its habitat associations. Klebsiella is a common opportunistic pathogen for humans and other animals, as well as being resident or transient flora (particularly in the gastrointestinal tract). Other habitats include sewage, drinking water, soils, surface waters, industrial effluents, and vegetation. Until recently, almost all these Klebsiella have been identified as one species, ie, K. pneumoniae. However, phenotypic and genotypic studies have shown that “K. pneumoniae” actually consists of at least four species, all with distinct characteristics and habitats. General habitat associations of Klebsiella species are as follows: K. pneumoniae—humans, animals, sewage, and polluted waters and soils; K. oxytoca—frequent association with most habitats; K. terrigena— unpolluted surface waters and soils, drinking water, and vegetation; K. planticola—sewage, polluted surface waters, soils, and vegetation; and K. ozaenae/K. rhinoscleromatis—infrequently detected (primarily with humans).

Peroxidase Localization in Hartmanella Trophozoites

1971 ◽  
Vol 29 ◽  
pp. 346-347 ◽  
Author(s):  
George E. Childs ◽  
Joseph H. Miller
Keyword(s):  
Hydrogen Peroxide ◽  
Ultrastructural Localization ◽  
Pathogenic Strain ◽  
Oxidative Enzymes ◽  
Differential Centrifugation ◽  
Electron Microscopic ◽  
Microscopic Studies ◽  
The Subject ◽  
Axenic Cultures

Biochemical and differential centrifugation studies have demonstrated that the oxidative enzymes of Acanthamoeba sp. are localized in mitochondria and peroxisomes (microbodies). Although hartmanellid amoebae have been the subject of several electron microscopic studies, peroxisomes have not been described from these organisms or other protozoa. Cytochemical tests employing diaminobenzidine-tetra HCl (DAB) and hydrogen peroxide were used for the ultrastructural localization of peroxidases of trophozoites of Hartmanella sp. (A-l, Culbertson), a pathogenic strain grown in axenic cultures of trypticase soy broth.

Sign in / Sign up

Export Citation Format

Share Document