Air Emissions Testing at an Oilfield Service Company Bulk Storage Facility

The aim of this article is to analyze internal control in service company. The analyze used the components of internal control according to COSO: control environment, risk assessment, control activities, information and communication, monitoring. Analysis of internal control used the data obtained through observation, questionnaires, interview, and documentary. Based on this analysis results can be concluded, that the dual positions refer with company SOP (Standard Operating Procedure). Separation of task does not work because that the dual positions. Therefore, the component of control activities applied at company is not in accordance with the component of control activities according to COSO. Nonconformity components still results in very effective internal control because the purpose of the internal control still remains to be achieved even though there are components that are not in accordance with the internal control components according to COSO.

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There Reduction of alkali loss in an ash leaching system

TAPPI Journal ◽

10.32964/tj16.7.383 ◽

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%.

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