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Quality Control

ControledeQualidadeCENIBRA’s pulp goes through a strict quality control process prior to shipment to customers. Through its specialized laboratories, the Quality Control Department monitors the inputs and generated products, fiber line, finished products, and research & development. And all this aims at ensuring one of the world’s best bleached eucalyptus hardwood (short fiber) pulp.

Activities of the Quality Control Department’s Laboratories

Purchased Products and Generated Products

Monitoring and qualifying of inputs purchased for replacement in the manufacturing process, such as bay salt, sulfur, limestone, sulfuric acid, methanol, aluminum sulfate and caustic soda, ensuring that the specification parameters meet the predetermined standards.

Among the main products generated during the manufacturing process it is worth mentioning: Cooking liquor (white liquor), liquor extracted from the Digesters (black liquor) and liquor from the Recovery Unit (green liquor), as well as lime, chemical products (chlorine dioxide, hypochlorite, caustic soda and hydrogen peroxide), used for bleaching the brown stock.

Glassware and solutions for analyses

Monitoring and qualifying of glassware used for analyses in the Central Laboratory (Quality Control Department), and the 7 area laboratories (Digester – 2, Causticizing – 1, Chemical Plant – 1, Drying – 2, and Forestry – 1). Preparation and standardization of solutions used for analyses in the above-mentioned laboratories.

Fiber Line and Finished Products

In order to provide input data for processing the cooking within the specified parameters this Laboratory performs analyses such as: Moisture, Density, Classification by chip size and impurities content (e.g.: splitters, bark, knots and fines), so as to assure the quality of brown stock leaving the cleaners.

Fiber Line

The Cooking and Bleaching operations require continuous production data processing in order to monitor the operating conditions and to ensure pulp quality. This laboratory performs analyses such as: kappa index, viscosity, whiteness and clusters (brown and white stock) and remnants of chemical products during the stages of bleaching in the two production lines.

Finished Product

Monitoring, qualification and classification of finished products (tissue paper, printing & writing paper) in order to meet our customers’ needs, within the parameters of technical specifications, in compliance with the requirements of the national and international markets and the ISO 9000 series standards.

The commercial specification parameters are: whiteness, viscosity, dirt (impurities), and moisture. To safeguard the quality of these analyses, the Laboratory annually participates in inter-laboratory programs organized by universities (UFV), entities (IPT), other pulp producers and customers.

Environmental Monitoring

To safeguard the quality of surface water and groundwater in the Doce River basin, the river that feeds the water treatment station (ETA), this Laboratory runs a monitoring program involving 12 wells, namely: 04 points at the plant, 04 points in the seedling nursery and 04 points in the industrial landfill.

Air Quality

Monitoring air quality by means of special analyses such as: suspension particulate matter, inhalable particles, total sedimentation dust, sulfur dioxide (SO2) and other gases (TRS) emitted by the stacks of the Recovery Boilers, Biomass, Oil and Lime Furnaces.

For the “odors” emitted into the atmosphere, the Company counts on an Odor Perception Network (OPN) designed to monitor and provide input data, which will work as a basis for continuing improvements. It counts also on gas analyzers, data generated by the automated weather station and a group of people living in the neighboring communities, who are trained to perceive and record odor events within a radius of up to 20 kilometers from the plant.

Soil Quality

In order to ensure the appropriate disposal and destination of solid wastes, thus avoiding environmental impacts to soil, this Laboratory is informed about all and any solid waste disposal – before being taken to the Industrial Landfill (Class II) and/or the Hazardous Waste Landfill (Class I) – for assessment and definition of the most appropriate destination.

Liquid Effluent Quality

The chemical wood pulp production process generates two main types of effluents: low organic matter effluents and high organic matter effluents. Apart from the analysis of specific effluents, analyses of the general effluent are made to determine: pH (6~9), Temperature (£ 40 ºC), DBO5 (£ 60 mg O2/l), DQO (£ 353 mg O2/l), Color, Total Suspension Solids (SST < 60 mg/l), AOX (< 0,6 kg/ADT), Phenol (< 0,2 mg/l), Oil and Grease (< 20 mg/l) etc.

These specific and general effluents are assessed against the required legal parameters according to the conditions established in the Operating License and agreements, in order to ensure compliance with the requirements of environmental agencies (FEAM, COPAM) and the ISO 14001 standard.

Research and Development

The Quality Control Department prepares an annual target plan with the objective of providing technical support toward continuing improvement of the Forestry-Industry Integration Program for enhanced finished product quality and meeting the customers’ expectations as best as possible. These technical activities are undertaken in such a way so as to contribute toward the reduction of operating costs and specific consumption of wood, industrial water, chemical products and process additives.

The methodologies being used for performing the analyses are periodically reviewed during in-company workshops, in which occasion the Laboratory technicians suggest improvements.