There Reduction of alkali loss in an ash leaching system

TAPPI Journal ◽  
2017 ◽  
Vol 16 (7) ◽  
pp. 383-391
Author(s):  
CARLA CÉLIA ROSA MEDEIROS ◽  
FLÁVIA AZEVEDO SILVA ◽  
SAULO GODOY PIGNATON ◽  
ESTANISLAU VICTOR ZUTAUTAS ◽  
KLEVERSON FIGUEIREDO
Keyword(s):  
Solid Waste ◽  
Air Emissions ◽  
Recovery Cycle ◽  
Chloride Level ◽  
Control Loops ◽  
Kraft Mill ◽  
Recovery Boiler ◽  
Ash Leaching

There are many points in a kraft mill where the alkaline compounds are purged from the process. Several effluents, solid waste, and air emissions contain alkali, which leads to the necessity of chemical makeups to maintain the liquor balance. The main loss of alkali at the Veracel mill is present in the wastewater from the recovery boiler; more precisely, it is from the ash leaching system, which represents 80% of the total losses. To minimize the alkaline losses while keeping the chloride level in the recovery cycle under control, a project was developed at Veracel. Key actions were taken by adjusting the control loops of the ash leaching system, mainly on the slurry density and purge control. These adjustments led to a decrease in alkali losses and to an increase of treated ash, and kept the chloride level of the recovery boiler dust at 2.6%.

Waste Discharge Reduction Program Overview – Monsanto Agricultural Company

1991 ◽  
Vol 24 (12) ◽  
pp. 29-32
Author(s):  
C. W. Keffer
Keyword(s):  
Emission Reduction ◽  
Hazardous Materials ◽  
Inorganic Materials ◽  
Air Emissions ◽  
Environmental Media ◽  
Waste Discharge ◽  
Air Emission ◽  
Reduction Program

Monsanto is committed to being a leader in reducing waste discharges to the environment. The Company announced in June 1988 a commitment to reduce air emissions of hazardous materials by 90% by the end of 1992. In addition, Monsanto Agricultural Company established a further goal to reduce the discharge of organic and hazardous inorganic materials to all environmental media. Projects have been identified for the Agricultural Company to achieve the 90% air emission reduction goal and to reduce projected 1995 waste discharges from 150 million pounds to 50 million pounds.

Data Quality Objectives Supporting Radiological Air Emissions Monitoring for the PNNL Richland Campus

2017 ◽  
Author(s):  
Sandra F. Snyder ◽  
Donna Grace L. Moleta ◽  
Kirsten M. Meier ◽  
John M. Barnett
Keyword(s):  
Data Quality ◽  
Air Emissions

The National Air Emissions Monitoring Study: Overview of Barn Sources

2008 ◽  
Author(s):  
Albert J Heber ◽  
Bill W Bogan ◽  
Ji-Qin Ni ◽  
Teng T Lim ◽  
Juan C Ramirez-Dorronsoro ◽  
...  
Keyword(s):  
Air Emissions ◽  
Monitoring Study
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