Short communication: Removal of reactor gas during pretreatment of kraft pulp with NO2 before oxygen bleaching

1986 ◽  
Vol 1 (3) ◽  
pp. 30-31
Author(s):  
Olof Samuelson ◽  
Urban Öjteg
Keyword(s):  
Kraft Pulp ◽  
Short Communication ◽  
Oxygen Bleaching

Activated Sludge Treatment of Kraft Mill Effluents from Conventional and Oxygen Bleaching

1991 ◽  
Vol 24 (3-4) ◽  
pp. 427-430 ◽  
Author(s):  
J. Nevalainen ◽  
P.-R. Rantala ◽  
J. Junna ◽  
R. Lammi
Keyword(s):  
Activated Sludge ◽  
Kraft Pulp ◽  
Activated Sludge Process ◽  
Chlorinated Phenols ◽  
Pulp Mills ◽  
Main Interest ◽  
Sludge Treatment ◽  
Kraft Pulp Mills ◽  
Activated Sludge Processes ◽  
Oxygen Bleaching

Conventional and oxygen bleaching effluents from hardwood kraft pulp mills were treated in laboratory-scale activated sludge processes. The main interest was the fate of organochlorine compounds in the activated sludge process. In the treatment of conventional bleaching wastewaters the BOD7-reduction was 80-91 % and in oxygen bleaching wastewaters 86-93 %. The respective CODCr removals were about 40 % and about 50 %. The AOX reductions were on average 22 % and 40 % in the treatment of conventional and oxygen bleaching effluents, respectively. The reductions of chlorinated phenols, guajacols and catecols were usually more than 50 % in both reactors. Very little accumulation of AOX into the sludge was observed. The stripping of AOX from aeration unit was insignificant.

A novel approach for the oxidative catalysis employing polyoxometalate–laccase system: application to the oxygen bleaching of kraft pulp

2004 ◽  
Vol 5 (9) ◽  
pp. 485-489 ◽  
Author(s):  
Ana P.M Tavares ◽  
Jose A.F Gamelas ◽  
Armindo R Gaspar ◽  
Dmitry V Evtuguin ◽  
Ana M.R.B Xavier
Keyword(s):  
System Application ◽  
Kraft Pulp ◽  
Novel Approach ◽  
Oxygen Bleaching ◽  
Oxidative Catalysis

Oxygen bleaching of kraft pulp with polyoxometalates and laccase applying a novel multi-stage process

2005 ◽  
Vol 33 (3-6) ◽  
pp. 57-64 ◽  
Author(s):  
Jose A.F. Gamelas ◽  
Ana P.M. Tavares ◽  
Dmitry V. Evtuguin ◽  
Ana M.B. Xavier
Keyword(s):  
Kraft Pulp ◽  
Multi Stage ◽  
Stage Process ◽  
Oxygen Bleaching

Oxygen Bleaching of Kraft Pulp 1. Role of Condensed Units

Holzforschung ◽  
1994 ◽  
Vol 48 (4) ◽  
pp. 355-359 ◽  
Author(s):  
Lai Yuan-Zong ◽  
Funaoka Masamitsu ◽  
Chen Hsin-Tai
Keyword(s):  
Kraft Pulp ◽  
Oxygen Bleaching

Oxygen bleaching of kraft pulp catalysed by Mn(III)-substituted polyoxometalates

2003 ◽  
Vol 239 (1-2) ◽  
pp. 157-168 ◽  
Author(s):  
A. Gaspar ◽  
D.V. Evtuguin ◽  
C. Pascoal Neto
Keyword(s):  
Kraft Pulp ◽  
Oxygen Bleaching

A Pretreatment with Nitrous Acid for Oxygen Bleaching of Kraft Pulp and Its Bleaching Mechanism.

1993 ◽  
Vol 47 (5) ◽  
pp. 635-644 ◽  
Author(s):  
Hiroshi Ohi ◽  
Masanao Tajiri ◽  
Yuzo Iwanaga ◽  
Masato Suzuki ◽  
Tetsuo Aoyagi ◽  
...  
Keyword(s):  
Nitrous Acid ◽  
Kraft Pulp ◽  
Oxygen Bleaching

Dissolution of Lignin in Kraft Pulp by Oxygen Bleaching

1993 ◽  
Vol 13 (2) ◽  
pp. 237-259 ◽  
Author(s):  
Per Larsson ◽  
Olof Samuelson
Keyword(s):  
Kraft Pulp ◽  
Oxygen Bleaching

Ultrastructure of primary spermatocyte in fish (Tilapia: Oreochromis niloticus): The synaptonemal complex

1986 ◽  
Vol 44 ◽  
pp. 288-289
Author(s):  
T. Guha ◽  
A. Q. Siddiqui ◽  
P. F. Prentis
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Synaptonemal Complex ◽  
Oreochromis Niloticus ◽  
Short Communication ◽  
Primary Spermatocyte ◽  
Mitotic Division ◽  
Meiotic Cell ◽  
Electron Microscope Level ◽  
Homologous Chromosomes

The Primary Spermatocytes represent a stage in spermatogenesis when the first meiotic cell division occurs. They are derived from Spermatogonium or Stem cell through mitotic division. At the zygotene phase of meiotic prophase the Synaptonemal complex appears in these cells in the space between the paired homologous chromosomes. Spermatogenesis and sperm structure in fish have been studied at the electron microscope level in a few species? However, no work has yet been reported on ultrastructure of tilapia, O. niloticus, spermatozoa and spermatogenetic process. In this short communication we are reporting the Ultrastructure of Primary Spermatocytes in tilapia, O. niloticus, and the fine structure of synaptonemal complexes seen in the spermatocyte nuclei.

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