BIOLUMINESCENCE INHIBITION ASSAYS FOR TOXICITY SCREENING OF WOOD EXTRACTIVES AND BIOCIDES IN PAPER MILL PROCESS WATERS

2004 ◽  
Vol 23 (2) ◽  
pp. 339 ◽  
Author(s):  
Anna Rigol ◽  
Anna Latorre ◽  
Sílvia Lacorte ◽  
Damià Barceló
Keyword(s):  
Paper Mill ◽  
Toxicity Screening ◽  
Wood Extractives ◽  
Bioluminescence Inhibition ◽  
Mill Process

Uniform Heating Device for a Paper Mill Process

2009 ◽  
Author(s):  
Krishna Guntur ◽  
R. S. Amano ◽  
Brinda Athreya
Keyword(s):  
Paper Mill ◽  
Drying Process ◽  
Paper Mills ◽  
Conveyor System ◽  
Hot Air ◽  
Heated Air ◽  
Drying System ◽  
Forced Air ◽  
Drying Conditions ◽  
Mill Process

Paper mills use elaborated drying process using hot rollers to dry the paper. In the recent past, use of hot air for drying has gained some interest. The main disadvantage of this method is non-uniform air temperature, which will cause lateral shrinkage of the paper. This paper discusses a new drying system. The process incorporates a porous medium to ensure uniform temperature by flattening the velocity distribution. The new system requires less equipment pieces and utilized less space for the drying process. A cloth is used in place of paper to increase the repeatability of the experiment. This experiment utilized a conveyor system to transport the cloth within the heater section. Variables concerning velocity and temperature values of the heated air, and heater intensity were adjusted to produce the different drying conditions. Forced air propane heater was used as the heat source. Design modifications were made so that the heater is more suitable for this process. The results showed significant improvement of the velocity and feasibility of extending this technology to the actual scale.

scholarly journals Application of Ultrafiltration in a Paper Mill: Process Water Reuse and Membrane Fouling Analysis

BioResources ◽  
2015 ◽  
Vol 10 (2) ◽  
Author(s):  
Chen Chen ◽  
Shengtao Mao ◽  
Jingjing Wang ◽  
Jinfeng Bao ◽  
Hui Xu ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Water Reuse ◽  
Paper Mill ◽  
Process Water ◽  
Mill Process

Masculinization of Eastern Mosquitofish (Gambusia) and Exposure to Pulp and Paper Discharge: Diminished Responses Following Mill Process Modifications

2010 ◽  
Vol 45 (2) ◽  
pp. 145-152
Author(s):  
Jessica J. Noggle ◽  
Timothy S. Gross ◽  
Stewart E. Holm
Keyword(s):  
Black Liquor ◽  
Biological Response ◽  
Paper Mill ◽  
Pulp And Paper ◽  
Pulp And Paper Mill ◽  
Oxygen Delignification ◽  
Sex Structure ◽  
Elemental Chlorine ◽  
Index Ratio ◽  
Mill Process

Abstract The abnormal induction of anal fin elongation (masculinization) in female Gambusia was first reported in the 1980s for Florida streams receiving pulp and paper effluents. Although these early reports indicated masculinization responses that were similar to the complete development of a gonopodium (male secondary sex structure), additional evaluations throughout the 1990s demonstrated significant reductions in this response. These historic data suggested that mill process modifications may have been responsible for the reduced masculinization responses. The objective of the current study was to utilize Georgia Pacifics Palatka Mill to monitor a series of mill process modifications and their effects on masculinization responses in Mosquitofish (Gambusia). Gambusia were collected from upstream, discharge, and downstream sites in the Palatka Mill receiving stream (Rice Creek) and masculinization was evaluated. Collections were conducted annually during 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2008, and 2009, before and after a series of modifications which included: conversion to elemental chlorine free bleaching, conversion of secondary treatment to aerobic degradation, reduction of in-mill black liquor losses, addition of condensate stripping, reduction in water usage from 136 to 83 million litres per day (36 to 22 million gallons per day), installation of new brown stock washers, and oxygen delignification. Masculinization responses were evaluated using the anal fin index (ratio or anal fin rays 4 and 6). Reductions in this masculinization response were observed gradually across 1999 through 2009, with an absence of response in female Gambusia during 2004, 2006, and 2008 to 2009. These data indicate that pulp and paper mill upgrades and process modifications have resulted in the elimination of this biological response in Gambusia.

Recycled paper mill process water pre-treatment using ultrafiltration for water system closure

2021 ◽  
Vol 44 ◽  
pp. 102407
Author(s):  
Hans Estrella Cainglet ◽  
Tomas Saavedra ◽  
Stefan Bürgmayr ◽  
Jianhua Zhang ◽  
Zongli Xie ◽  
...  
Keyword(s):  
Water System ◽  
Paper Mill ◽  
Process Water ◽  
Recycled Paper ◽  
Pre Treatment ◽  
Mill Process
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