Pulp Mill Effluent Treatment by Fenton-Type Reactions Catalyzed by Iron Complexes

1999 ◽  
Vol 40 (11-12) ◽  
pp. 351-355 ◽  
Author(s):  
Jaime Rodríguez ◽  
David Contreras ◽  
Carolina Parra ◽  
Juanita Freer ◽  
Jaime Baeza ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Aqueous Solutions ◽  
Fenton Reaction ◽  
Pulp Mill ◽  
Effluent Treatment ◽  
Pulp Mill Effluent ◽  
Large Decrease ◽  
Dihydroxybenzoic Acid ◽  
Pulp Bleaching ◽  
Efficient Option

Fenton reaction, which involves hydrogen peroxide and ferrous ion, has been proposed as an efficient option for effluent treatment. In this work, the treatment of a pulp bleaching effluent using Fenton-type reactions assisted by either, 2,3-dihydroxybenzoic acid (2,3-DHBA), 3,4-dihydroxybenzoic acid (3,4-DHBA) and 1,2-dihydroxybenzene (CAT), were studied. The treatment was evaluated by the removal of adsorbable organochloride compounds (AOX) and toxicity. Furthermore, the degradation of 2-chlorophenol and 4-chlorophenol in aqueous solutions were carried out, separately. Increase in oxidative activities of Fenton-type reactions mediated by the dihydroxybenzenes (DHBs) were found. These activities enhancement were related with a higher production of activated species by Fe/DHBs/H2O2, as indicted by chemiluminesce. The large decrease in AOX values and toxicity of the treated bleaching effluent by DHBs at pH 4.0 and 7.0 showed that 2,3-DHBA enhanced the activity of the Fenton reaction. The use of 3,4-DHBA and CAT resulted in loss of efficiencies of Fenton reaction to effluent treatment but not to pure chlorophenol solutions. At pH 7.0 lower efficiencies than those at pH 4.0 were achieved.

Kinetics of pulp mill effluent treatment by ozone-based processes

2009 ◽  
Vol 168 (2-3) ◽  
pp. 875-881 ◽  
Author(s):  
Chun-Han Ko ◽  
Po-Hung Hsieh ◽  
Meng-Wen Chang ◽  
Jia-Ming Chern ◽  
Shih-Min Chiang ◽  
...  
Keyword(s):  
Pulp Mill ◽  
Effluent Treatment ◽  
Pulp Mill Effluent ◽  
Kinetics Of

Odours from pulp mill effluent treatment ponds: the origin of significant levels of geosmin and 2-methylisoborneol (MIB)

Chemosphere ◽  
2003 ◽  
Vol 51 (8) ◽  
pp. 765-773 ◽  
Author(s):  
Susan B Watson ◽  
Jeff Ridal ◽  
Beryl Zaitlin ◽  
Amy Lo
Keyword(s):  
Pulp Mill ◽  
Effluent Treatment ◽  
Pulp Mill Effluent

Use of an Improved Chemiluminescence Assay for Non-Intrusive Measurement of Hydroxyl Radicals in a Biomimetic Pulp Bleaching Model System

Holzforschung ◽  
1999 ◽  
Vol 53 (2) ◽  
pp. 181-187 ◽  
Author(s):  
C. C. Walker ◽  
R. J. Dinus ◽  
T. J. McDonough ◽  
K.-E. L. Eriksson
Keyword(s):  
Hydrogen Peroxide ◽  
Aqueous Solutions ◽  
Hydroxyl Radicals ◽  
Model System ◽  
Pulp Bleaching ◽  
Assay Sensitivity ◽  
Chemiluminescence Assay ◽  
Naturally Occurring ◽  
Excellent Tool

Summary A chemiluminescence assay was used to measure the production of hydroxyl radicals (·OH) in aqueous solutions of hydrogen peroxide and iron-containing catalysts. Preliminary experiments evaluating assay sensitivity revealed that one of the required reagents, phthalhydrazide (PtH), interfered with the studied reactions. In addition, undesirable degradation of the chemiluminescent form of PtH was observed. By removing PtH from reaction solutions and modifying the published procedures, a successful non-intrusive method for measurement of ·OH was obtained. The modified assay was used to compare the rate of ·OH generation in solutions of H2O2, either FeSO4 or Fe-EDTA and a substrate, lignosulfonate. This “biomimetic” pulp bleaching system is meant to simulate naturally occurring biological reactions utilized for degradation of lignins by wood-degrading fungi. Results from these experiments show that FeSO4 produced more ·OH than Fe-EDTA. The improved non-intrusive chemiluminescence assay has proven to be an excellent tool for investigating the role of the ·OH in biomimetic pulp bleaching and potentially other systems.

Molecular analysis of bacterial isolates and total community DNA from kraft pulp mill effluent treatment systems

1998 ◽  
Vol 44 (6) ◽  
pp. 537-546 ◽  
Author(s):  
Nathalie Fortin ◽  
Roberta R Fulthorpe ◽  
D Grant Allen ◽  
Charles W Greer
Keyword(s):  
Kraft Pulp ◽  
Pulp Mill ◽  
Effluent Treatment ◽  
Pulp Mill Effluent ◽  
Bacterial Isolates ◽  
Oligonucleotide Primers ◽  
Kraft Pulp Mill ◽  
Gene Probes ◽  
Total Community ◽  
Total Community Dna

Chloroaliphatics are major components of bleached kraft mill effluents. Gene probes and oligonucleotide primers were developed to monitor kraft pulp mill effluent treatment systems for the presence of key genes (dehalogenases) responsible for the dehalogenation of chloroaliphatic organics. The primers were used for polymerase chain reaction (PCR) analysis of genomic DNA extracted from dehalogenating bacterial isolates and from total community DNA extracted from water and sediments of mill effluent treatment systems. PCR amplification with oligonucleotide primers designed from dhlB, encoding the haloacid dehalogenase from Xanthobacter autotrophicus, revealed the presence of dehalogenase genes in both aerated lagoons and stabilization basins. Similarly, positive results were obtained with mmoX primers designed from the soluble methane monooxygenase gene of Methylococcus capsulatus Bath. The haloacetate dehalogenase encoding gene (dehH2) from Moraxella sp. was typically not detected in mill effluent treatment systems unless the biomass was selectively enriched. DNA sequence analysis of several PCR fragments revealed significant similarity to known dehalogenase and methane monooxygenase genes. The results indicated a broad distribution of known dehalogenation genes and bacteria with chloroorganic-degrading potential in the mill effluent treatment systems.Key words: dehalogenase, gene probes, chloroorganics, PCR, mill effluents.

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