RECYCLING BIOLOGICAL SLUDGE IN PAPER INDUSTRY IN PRODUCTION

News

20/07/2024

Currently, the paper industry is one of the key industries of our country. When applied to common items such as notebooks, books, newspapers... to environmentally friendly products ... With such a strong growth rate, controlling waste in the paper production process is a challenge for managers. And biological sludge of the paper industry is one of them because if not strictly managed, it will cause a waste of resources. Moreover, it causes environmental pollution in the short and long term. So what are the characteristics of biological sludge in the paper industry and how to effectively treat sludge? Let's follow the article below with BioFix.

1. Characteristics of biological sludge in the paper and pulp industry

In the process of processing raw materials, processing paper, and pulp ... wastewater will be generated with a large amount of solid waste along with impurities of many different properties. Therefore, biological sludge in the paper industry will have some of the following main components:

Water accounts for 60-65%, the rest are cellulose, hemicellulose, lignin, extractants, ash... In which:

The ash content in paper sludge depends on the input materials of pulp such as hardwood, softwood, bamboo, rattan, and bamboo... Measured by the content of inorganic substances other than carbon, hydrogen, oxygen, and nitrogen. This content fluctuates around 0.3-1.5% depending on the variety, harvest age, and growth environment of the plant.

In the coagulation process, the conditioning agent (polymer) is formed in the sludge when it is removed from the water, through the flotation tank. Polymers used as coagulants in water treatment include neutral cationic and anionic molecules... In addition, paper industry biological sludge is also made up of a mixture of short cellulose fibers and inorganic fillers such as calcium carbonate, kaolin, and residual chemicals in sludge... This is also the reason why sludge when discharged into the environment is inevitably polluted.

2. Types of biological sludge in the paper industry

In different stages, sludge is divided into many types: Primary sludge: formed from the process of producing original pulp from wood. Deinking sludge: recovered from the process of deinking recycled paper. Secondary sludge: recovered from the process of treating recycled wastewater. The total amount of sludge containing pulp fluctuates between 3-5% of paper production. With the cellulose content that can account for 40-60% of the solid mass.

3. Recirculation of biological sludge in the paper industry

a) Using biological sludge in composting
Because fertilizers made from biological sludge in the paper industry will go through many different stages. Creating many intermediate products with biological transformations. Through that, creating a final product that is pathogen-free, beneficial, safe, and beneficial for plant growth, based on the temperature variation that occurs during the aerobic composting phase, mainly in the thermophilic phase.
This is the stage where the temperature is highest, from 40-65o C to destroy pathogenic microorganisms as well as stabilize waste. Moreover, it promotes the decomposition of proteins, fats, and complex hydrocarbons such as cellulose and hemicellulose...
In addition, we can add BioFix Composting to promote the composting process, improving the quality of the finished product. With ingredients of selected microorganisms. It ensures safety for humans and is environmentally friendly.

b) Fuel for construction materials
In addition, paper sludge can also be used to make products in the construction materials manufacturing sector, specifically: bricks, cement, etc. With 5 - 15% of paper sludge added as raw materials. The product has become lighter, saving firing time as well as fuel in the kiln. Increases the ability to resist cracking during the drying and firing stages. With its inherent fiber content. In addition, paper sludge has also become an effective alternative fuel in the production of Portland cement, due to its high organic content.

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