Wood-free paper

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Wood-free paper is paper created exclusively from chemical pulp rather than mechanical pulp. [1] Chemical pulp is normally made from pulpwood, but is not considered wood as most of the lignin is removed and separated from the cellulose fibers during processing, whereas mechanical pulp retains most of its wood components and can therefore still be described as wood. [2] [3] [4] Wood-free paper is not as susceptible to yellowing as paper containing mechanical pulp. Wood-free paper offers several environmental and economic benefits, including reduced deforestation, decreased energy consumption, and improved waste management. [5] [6] The term Wood-free paper can be rather misleading or confusing for someone unfamiliar with the papermaking process because paper is normally made from wood pulp derived from trees and shrubs.

Contents

However, wood free paper does not mean that the paper in question is not made from wood pulp but it means that the lignin in the wood fiber has been removed by a chemical process. Paradoxically, lignin is the complex polymers containing aromatic groups that provide much of the tree strength. In its natural form, it gives rigidity and resilience to the tree, but its presence causes paper to weaken and turn yellow as it ages and eventually disintegrate. The reason for this is that as the paper ages, lignin releases acid which degrades the paper. [7] Wood is technically a lignocellulosic material and a xylem tissue that comes from shrubs and cambium, the inner bark of trees made up of extractives, lignin, hemicellulose and cellulose. [8] Pulp consists of wood and other lignocellulosic materials that have been broken down chemically and physically and filtered and mixed in water to reform into a web. [8] [9] Creating pulp by breaking down the materials chemically is called chemical pulping, while creating pulp by breaking them down mechanically is called mechanical pulping.

In chemical pulping, chemicals separate the wood fibers. The chemicals lower the lignin content because chemical action solubilizes and degrades components of wood fibers, especially hemicelluloses and lignin. Chemical pulping yields single unbroken fibers that produce strong quality papers because the lignin that interferes with hydrogen bonding of wood fibers has been removed. Chemical pulps are used to create wood free paper that is of high quality and lasts long, such as is used in arts and archiving. [8] Chemical pulping processes take place at high pressures and temperatures under aqueous alkaline, neutral or acidic conditions, with the goal of totally removing the lignin and preserving the carbohydrates. Normally, about 90% of the lignin is removed. [9]

Mechanical pulping, in contrast, converts raw wood into pulp without separating the lignin from the wood fiber. [9] No chemicals other than water or steam are used. The yield is about 90% to 98%. High yields result from the fact that lignin is retained. Mechanical pulps are characterized by low cost, high stiffness, high bulk, and high yield.  Mechanical pulp has low strength because the lignin interferes with hydrogen bonding between wood fibers. The lignin also makes the pulp turn yellow when exposed to light and air. Mechanical pulps are used in the production of non-permanent papers such as newsprint and catalog papers. Mechanical pulps made up 20% to 25% of the world production and this is increasing because of the high yield of the process and increasing competition for fiber resources. Advances in technology have also made mechanical pulp increasingly desirable. [8]

Composition

Wood-free paper is made from a variety of raw materials, including

Wood-free paper has a number of advantages over paper that contains mechanical pulp:

Wood-free paper is used in a variety of applications:

Types of wood-free papers

Wood-free paper is made from non-wood materials, such as cotton, hemp, linen, and bamboo. [18] [27] [28] It is often used in applications where a high-quality, durable paper is needed, such as for printing, writing, and packaging.

There are two main types of wood-free paper:

Tissue pulp paper is smooth and opaque, making it ideal for printing and writing. [30] [31] [32] It is also relatively inexpensive, making it a popular choice for many applications. Non-wood pulp paper is more expensive than tissue pulp paper, but it is also more durable and has a higher quality. [33] [34] [35] It is often used for high-end printing and writing applications, as well as for packaging.

Here are some of the specific types of wood-free papers:

Wood-free paper is a good choice for applications where a high-quality, durable paper is needed. [10] It is also a sustainable choice, as it is made from renewable and recyclable materials.

Wood-free papers come in two varieties: uncoated and coated. Uncoated is typically used for printing and writing but also used in some packaging applications, whereas coated is used for things such as packaging and labels. [40]

Advantages and benefits of wood-free paper

  1. Conservation of Forests: One of the key advantages of wood-free paper is its ability to reduce the demand for wood pulp derived from trees. This conservation of forests persevering valuable ecosystems and biodiversity. Wood-free paper production significantly contributes to the conservation of forests by reducing deforestation and protecting natural habitats. [41] [42]
  2. Harder to Warp: Another key advantage of wood-free paper is its lesser likelihood to warp or curl. [43]
  3. Decreased Deforestation: The use of alternative fibers in timber-loose paper reduces the stress on forests, minimizing the need for big-scale deforestation. This helps protect touchy and ecologically valuable regions. [44] [45] [46]
  4. Decreased Carbon Footprint: wooden-loose paper generally has a decreased environmental effect as compared to standard wood-based total paper. The manufacturing system emits fewer greenhouse gases, consumes less strength,[ clarification needed ] and requires less water. [47] [48] Additionally, it frequently includes fewer chemical treatments.
  5. Usage of Agricultural Residues: Wooden-free paper can be made from agricultural residues like wheat straw, rice straw, and bagasse. Making use of those by-products of agriculture reduces waste and presents an extra source of revenue for farmers. [49]
  6. Advertising of Sustainable Farming Practices: The cultivation of opportunity fiber crops for paper manufacturing encourages sustainable agricultural practices. although vegetation frequently requires fewer insecticides and fertilizers as compared to traditional crops, lowering environmental impacts.
  7. Waste discount and recycling: wooden-unfastened paper is often crafted from recycled materials. This supports recycling projects and reduces the demand for brand new raw materials. moreover, it emitted from landfills.
  8. Diversification of supply Chains: depending completely on timber pulp can result in overexploitation of unique tree species and wooded area ecosystems. Incorporating alternative fibers diversifies the assets of uncooked materials for the paper industry, decreasing strain on precise varieties of timber.
  9. Energy efficiency: wood-free paper manufacturing often requires much less electricity compared to conventional timber-based totally papertmanufacTuring. this is because the processing of opportunity fibers normally entails fewer steps and mucnergy-in-ergy-in depth remedies.
  10. More advantageous Soil health: utilizing agricultural residues for paper manufacturing can enhance soil fitness by returning organic count to the soil. this may lead to better fertility and a normal soil structure.
  11. Help for Rural communities: The manufacturing of timber-free paper using agricultural residues can create economic possibilities for rural communities. This will lead to improved livelihoods and sustainable improvement in areas where these resources are plentiful.
  12. Monetary Viability and market demand: The demand for environmentally sustainable products, including wood-free paper, is on the rise. This presents economic opportunities for businesses that choose to invest in and produce eco-friendly paper products.
  13. Alignment with Sustainability desires: the use of wood-loose paper aligns with global sustainability dreams, together with the ones outlined within the United Nations Sustainable Improvement Goals (SDGs). It contributes to desires related to accountable consumption and production (SDG 12) and existence on land (SDG 15).

Alternative Fibers: The Key Players

1. Agricultural Residues

Agricultural residues refer to the organic materials that are left over after crops are harvested. [50] [51] These residues include the stems, leaves, husks, and other parts of plants that are not used for food or other primary products. [52] [53] They are a significant component of agricultural ecosystems and have various potential uses, both beneficial and detrimental. [54] [55] [56] Here's a detailed overview of agricultural residues:

Types of Agricultural Residues

  1. Crop Residues:
    • Stems and Leaves: These are typically the above-ground portions of plants that remain after harvest. [57] [58] [59] [60] They are composed mainly of cellulose, hemicellulose, and lignin.
    • Husks and Straws: These are the protective coverings of seeds and grains, like rice husks and wheat straw. [61] [52]
    • Roots: After harvest, the roots of some plants may also be left in the ground. [62] [63] [64]
  2. Animal Manure:
    • Dung and Urine: Manure from livestock contains organic matter and nutrients that can be used as a soil conditioner or fertilizer. [65] [66] [67]

Characteristics of Agricultural Residues

  1. Chemical Composition:
    • They are primarily composed of organic compounds such as cellulose, hemicellulose, lignin, and various other polysaccharides. [68] [69] [70] These materials provide structural support to plants.
  2. Nutrient Content:
    • They contain a range of essential nutrients including nitrogen, phosphorus, potassium, and micronutrients.[ citation needed ] However, the nutrient content varies depending on the type of residue and the plant it comes from.
  3. Moisture Content:
    • This varies greatly depending on the type of residue, climate, and storage conditions. [71] Some residues are relatively dry (e.g., straw), while others may have a higher moisture content (e.g., green crop residues).
  4. Decomposition Rate:
    • The rate at which agricultural residues decompose depends on their chemical composition. [72] [73] [74] For example, lignin-rich materials like wood take longer to break down compared to cellulose-rich materials like straw.

Uses and Applications

  1. Soil Amendment:
    • Agricultural residues are commonly used to improve soil structure, moisture retention, and nutrient content. [75] [76] [77] They act as organic matter, enhancing soil fertility.
  2. Bioenergy Production:
    • Residues can be processed to produce biofuels like biogas, bioethanol, and bio-oil. [78] [79] [80] This contributes to renewable energy production.
  3. Livestock Bedding:
    • Straw and other crop residues can be used as bedding for livestock. [81] This provides a comfortable and clean environment, reducing the risk of diseases.
  4. Composting:
    • They are valuable components in composting operations, providing carbon-rich material that balances the nitrogen-rich materials (like green plant matter and manure). [82] [83] [84]
  5. Erosion Control:
    • Cover crops and crop residues left on the field surface can help prevent soil erosion by wind and water. [85] [86] [87]
  6. Mushroom Cultivation:
    • Certain agricultural residues, such as rice straw and sawdust, are used as substrates for growing mushrooms. [88] [89] [90]

Challenges and Considerations

  1. Nutrient Imbalance:
    • Depending on the type of residue, there may be an imbalance in the nutrient content, which may require supplementation. [91]
  2. Harvesting Practices:
    • Leaving residues on the field can have both positive (soil protection, organic matter addition) and negative (pest and disease carryover) consequences, depending on how it's managed. [92]
  3. Transport and Storage:
    • Handling and transporting large quantities of agricultural residues can be logistically challenging due to their bulkiness.
  4. Environmental Impact:
    • If not managed properly, burning or improper disposal of residues can lead to air pollution and contribute to greenhouse gas emissions. [93] [94] [95]

2. Cotton

Cotton is a natural fiber that has been used for thousands of years to make textiles. It is derived from the fibers surrounding the seeds of the cotton plant (Gossypium). [96] [97] Here's a detailed overview of cotton:

Botanical Characteristics

Cotton Cultivation

  1. Climate: Cotton is primarily grown in regions with a warm climate. It requires a frost-free growing season of about 160 to 200 days. [98] [99]
  2. Soil: Well-draining loam soils with good fertility are ideal for cotton cultivation. [100] [101]
  3. Cultivation Practices:
    • Planting: Cotton seeds are planted in rows, and the plants are spaced out to allow for proper growth and air circulation. [102]
    • Irrigation: Cotton requires regular watering, especially during dry spells.
    • Fertilization: Depending on the soil's nutrient content, supplementary fertilizers may be used.
  4. Pest Management: Cotton plants are susceptible to various pests and diseases. Integrated Pest Management (IPM) practices are often employed to minimize chemical inputs.

Life Cycle

  1. Germination and Growth: Cotton seeds germinate in warm soil. The plants grow into bushes with multiple branches, and flowers emerge at the nodes.
  2. Flowering: Cotton plants produce large, showy flowers that are usually white or cream-colored. Each flower produces a cotton boll, which contains the seeds.
  3. Boll Formation: After fertilization, the flower wilts, and the ovary enlarges to form a boll. Inside the boll, fibers develop around the seeds.
  4. Harvesting: Cotton bolls mature and split open, revealing the cotton fibers. Harvesting involves mechanically picking the cotton or, in some cases, by hand.

Cotton Fiber

  1. Chemical Composition: Cotton fibers are primarily composed of cellulose, a complex carbohydrate that provides strength and flexibility.
  2. Properties:
    • Cotton fibers are soft, breathable, and absorbent, making them suitable for a wide range of textile applications.
    • They have good dye affinity, allowing for a wide range of colors and finishes.
  3. Staple Length: The length of cotton fibers, known as the staple length, varies depending on the cotton variety. Longer staple lengths are typically associated with higher-quality cotton.

Cotton Products and Applications

  1. Textiles: Cotton is used to produce a wide range of textile products including clothing, linens, towels, and upholstery.
  2. Nonwoven Fabrics: Cotton fibers are also used in nonwoven applications like medical dressings, wipes, and filters.
  3. Seed Products: Cotton seeds are crushed to extract oil, which is used in cooking and various industrial applications. The remaining seed meal is used in animal feed.

Challenges and Considerations

  1. Pesticide Use: Cotton is susceptible to pests, and conventional farming often involves the use of pesticides. Sustainable and organic cotton production methods aim to reduce chemical inputs.
  2. Water Usage: Cotton cultivation can be water-intensive, particularly in arid regions. Efficient irrigation practices and water-saving technologies are being implemented.
  3. Genetic Modification: Some varieties of cotton are genetically modified (GM) to resist pests or tolerate specific environmental conditions. This has both benefits and controversies.

3. Hemp

Hemp, scientifically known as Cannabis sativa, is a versatile plant that has been cultivated for thousands of years for various purposes, including fiber, food, medicine, and industrial applications. Here's a detailed overview of hemp:

Botanical Characteristics

Hemp Cultivation

  1. Climate: Hemp is a robust plant that can grow in a wide range of climates. It is adaptable and can thrive in temperate, subtropical, and tropical climates.
  2. Soil: Well-draining, loamy soils with good fertility are ideal for hemp cultivation. Hemp can also grow in various soil types, including sandy and clayey soils.
  3. Cultivation Practices:
    • Planting: Hemp seeds are typically sown directly in the field. The spacing between plants depends on the specific variety and intended use (fiber, seed, or cannabinoid production).
    • Irrigation: Hemp requires regular watering, especially during dry spells, but it can also tolerate drought conditions.
  4. Pest and Disease Management: While hemp is generally considered a hardy plant, it can still be susceptible to certain pests and diseases. Integrated pest management (IPM) practices are used to address these issues.

Life Cycle

  1. Germination and Growth: Hemp seeds germinate in warm soil. The plant grows into a tall, upright stem with multiple branches. It is a fast-growing plant.
  2. Flowering: Depending on the variety and purpose of cultivation, hemp plants can flower in as little as 60–90 days. The flowers of female plants are the primary site of cannabinoid production.
  3. Seed Formation: In some varieties, female plants produce seeds after pollination. These seeds can be harvested and used for various purposes, including food and oil production.
  4. Harvesting: The timing of hemp harvest depends on the intended use. For fiber production, the plants are typically harvested before flowering. For seed production, they are left to mature longer. For cannabinoids, the harvest occurs when the plants have reached the desired cannabinoid content.

Hemp Products and Applications

  1. Fiber: Hemp fibers are known for their strength and durability. They can be used to make a wide range of products including textiles, ropes, paper, and construction materials.
  2. Seeds: Hemp seeds are rich in protein, healthy fats, and various nutrients. They are used in food products like hemp oil, hemp milk, protein powders, and as a whole food ingredient.
  3. Hemp Oil: Hemp seeds can be cold-pressed to extract oil, which is used in cooking, skincare products, and industrial applications.
  4. Cannabinoids (CBD and THC): Some varieties of hemp are bred for their cannabinoid content. Cannabidiol (CBD) and tetrahydrocannabinol (THC) are two of the most well-known cannabinoids. Hemp-derived CBD is used in various wellness and medicinal products.
  5. Industrial Applications: Hemp can be used to make a wide range of industrial products including biofuels, biodegradable plastics, building materials, and more.

Challenges and Considerations

  1. Regulatory Environment: The legal status of hemp varies by country and region. Many places have strict regulations around cultivation due to its association with cannabis.
  2. Pollination: For some purposes (such as cannabinoid production), preventing male plants from pollinating female plants is essential to maintain high cannabinoid content.
  3. Crop Uniformity: Hemp crops can show a wide range of genetic diversity, which can lead to variability in desired traits. Selective breeding and genetic techniques are used to address this.

See also

Related Research Articles

<span class="mw-page-title-main">Cellulose</span> Polymer of glucose and structural component of cell wall of plants and green algae

Cellulose is an organic compound with the formula (C
6
H
10
O
5
)
n
, a polysaccharide consisting of a linear chain of several hundred to many thousands of β(1→4) linked D-glucose units. Cellulose is an important structural component of the primary cell wall of green plants, many forms of algae and the oomycetes. Some species of bacteria secrete it to form biofilms. Cellulose is the most abundant organic polymer on Earth. The cellulose content of cotton fibre is 90%, that of wood is 40–50%, and that of dried hemp is approximately 57%.

<span class="mw-page-title-main">Lignin</span> Structural phenolic polymer in plant cell walls

Lignin is a class of complex organic polymers that form key structural materials in the support tissues of most plants. Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily. Chemically, lignins are polymers made by cross-linking phenolic precursors.

<span class="mw-page-title-main">Pulp (paper)</span> Fibrous material used notably in papermaking

Pulp is a fibrous lignocellulosic material prepared by chemically, semi-chemically or mechanically producing cellulosic fibers from wood, fiber crops, waste paper, or rags. Mixed with water and other chemicals or plant-based additives, pulp is the major raw material used in papermaking and the industrial production of other paper products.

<span class="mw-page-title-main">Pyrolysis</span> Thermal decomposition of materials

Pyrolysis is the process of thermal decomposition of materials at elevated temperatures, often in an inert atmosphere without access to oxygen.

<span class="mw-page-title-main">Cover crop</span> Crop planted to manage erosion and soil quality

In agriculture, cover crops are plants that are planted to cover the soil rather than for the purpose of being harvested. Cover crops manage soil erosion, soil fertility, soil quality, water, weeds, pests, diseases, biodiversity and wildlife in an agroecosystem—an ecological system managed and shaped by humans. Cover crops can increase microbial activity in the soil, which has a positive effect on nitrogen availability, nitrogen uptake in target crops, and crop yields. Cover crops reduce water pollution risks and remove CO2 from the atmosphere. Cover crops may be an off-season crop planted after harvesting the cash crop. Cover crops are nurse crops in that they increase the survival of the main crop being harvested, and are often grown over the winter. In the United States, cover cropping may cost as much as $35 per acre.

<span class="mw-page-title-main">Kenaf</span> Species of flowering plant

Kenaf [etymology: Persian], Hibiscus cannabinus, is a plant in the family Malvaceae also called Deccan hemp and Java jute. Hibiscus cannabinus is in the genus Hibiscus and is native to Africa, though its exact origin is unknown. The name also applies to the fibre obtained from this plant. Kenaf is one of the allied fibres of jute and shows similar characteristics.

<span class="mw-page-title-main">Fiber crop</span> Plant grown for fiber

Fiber crops are field crops grown for their fibers, which are traditionally used to make paper, cloth, or rope.

<span class="mw-page-title-main">Bagasse</span> Residue of sugar cane after juice extraction

Bagasse is the dry pulpy fibrous material that remains after crushing sugarcane or sorghum stalks to extract their juice. It is used as a biofuel for the production of heat, energy, and electricity, and in the manufacture of pulp and building materials. Agave bagasse is similar, but is the material remnants after extracting blue agave sap.

<span class="mw-page-title-main">Hemp</span> Low-THC cannabis plant

Hemp, or industrial hemp, is a plant in the botanical class of Cannabis sativa cultivars grown specifically for industrial and consumable use. It can be used to make a wide range of products. Along with bamboo, hemp is among the fastest growing plants on Earth. It was also one of the first plants to be spun into usable fiber 50,000 years ago. It can be refined into a variety of commercial items, including paper, rope, textiles, clothing, biodegradable plastics, paint, insulation, biofuel, food, and animal feed.

<span class="mw-page-title-main">Biorefinery</span> Refinery that converts biomass to energy and other beneficial byproducts

A biorefinery is a refinery that converts biomass to energy and other beneficial byproducts. The International Energy Agency Bioenergy Task 42 defined biorefining as "the sustainable processing of biomass into a spectrum of bio-based products and bioenergy ". As refineries, biorefineries can provide multiple chemicals by fractioning an initial raw material (biomass) into multiple intermediates that can be further converted into value-added products. Each refining phase is also referred to as a "cascading phase". The use of biomass as feedstock can provide a benefit by reducing the impacts on the environment, as lower pollutants emissions and reduction in the emissions of hazard products. In addition, biorefineries are intended to achieve the following goals:

  1. Supply the current fuels and chemical building blocks
  2. Supply new building blocks for the production of novel materials with disruptive characteristics
  3. Creation of new jobs, including rural areas
  4. Valorization of waste
  5. Achieve the ultimate goal of reducing GHG emissions
<span class="mw-page-title-main">Crop residue</span> The stalks , leaves , husks, roots, etc. left after crop is harvested and processed

Crop residues are waste materials generated by agriculture. The two types are:

<span class="mw-page-title-main">Pulp mill</span> Facility which pulps wood or plant fibre

A pulp mill is a manufacturing facility that converts wood chips or other plant fiber sources into a thick fiber board which can be shipped to a paper mill for further processing. Pulp can be manufactured using mechanical, semi-chemical, or fully chemical methods. The finished product may be either bleached or non-bleached, depending on the customer requirements.

Lignosulfonates (LS) are water-soluble anionic polyelectrolyte polymers: they are byproducts from the production of wood pulp using sulfite pulping. Most delignification in sulfite pulping involves acidic cleavage of ether bonds, which connect many of the constituents of lignin. Sulfonated lignin (SL) refers to other forms of lignin by-product, such as those derived from the much more popular Kraft process, that have been processed to add sulfonic acid groups. The two have similar uses and are commonly confused with each other, with SL being much cheaper. LS and SL both appear as free-flowing powders; the former is light brown while the latter is dark brown.

<span class="mw-page-title-main">Lignocellulosic biomass</span> Plant dry matter

Lignocellulose refers to plant dry matter (biomass), so called lignocellulosic biomass. It is the most abundantly available raw material on the Earth for the production of biofuels. It is composed of two kinds of carbohydrate polymers, cellulose and hemicellulose, and an aromatic-rich polymer called lignin. Any biomass rich in cellulose, hemicelluloses, and lignin are commonly referred to as lignocellulosic biomass. Each component has a distinct chemical behavior. Being a composite of three very different components makes the processing of lignocellulose challenging. The evolved resistance to degradation or even separation is referred to as recalcitrance. Overcoming this recalcitrance to produce useful, high value products requires a combination of heat, chemicals, enzymes, and microorganisms. These carbohydrate-containing polymers contain different sugar monomers and they are covalently bound to lignin.

Tree-free paper, also known as no tree paper, offers an alternative to traditional wood-pulp paper due to its unique raw material composition. This type of paper is considered more eco-friendly especially when evaluating its entire life cycle.

<span class="mw-page-title-main">Cellulose fiber</span> Fibers made with ethers or esters of cellulose

Cellulose fibers are fibers made with ethers or esters of cellulose, which can be obtained from the bark, wood or leaves of plants, or from other plant-based material. In addition to cellulose, the fibers may also contain hemicellulose and lignin, with different percentages of these components altering the mechanical properties of the fibers.

<span class="mw-page-title-main">Used coffee grounds</span> Waste product from brewing coffee

Used coffee grounds is the result of brewing coffee, and are the final product after preparation of coffee. Despite having several highly-desirable chemical components, used coffee grounds are generally regarded as waste, and they are usually thrown away or composted. As of 2019, it was estimated that over 15 million tonnes of spent coffee grounds are generated annually. Due to this quantity of waste and the chemical properties of used coffee grounds, they have several potential uses.

<span class="mw-page-title-main">Genetically modified tree</span> Tree whose DNA has been modified using genetic engineering techniques

A genetically modified tree is a tree whose DNA has been modified using genetic engineering techniques. In most cases the aim is to introduce a novel trait to the plant which does not occur naturally within the species. Examples include resistance to certain pests, diseases, environmental conditions, and herbicide tolerance, or the alteration of lignin levels in order to reduce pulping costs.

Hemp paper is a paper variety consisting exclusively or to a large extent from pulp obtained from fibers of industrial hemp. The products are mainly specialty papers such as cigarette paper, banknotes and technical filter papers. Compared to wood pulp, hemp pulp offers a four to five times longer fibre, a significantly lower lignin fraction as well as a higher tear resistance and tensile strength. Because the paper industry's processes have been optimized for wood as the feedstock, production costs currently are much higher than for paper from wood.

<span class="mw-page-title-main">Brewer's spent grain</span> Food waste in the brewing industry

Brewer's spent grain (BSG) or draff is a food waste that is a byproduct of the brewing industry that makes up 85 percent of brewing waste. BSG is obtained as a mostly solid residue after wort production in the brewing process. The product is initially wet, with a short shelf-life, but can be dried and processed in various ways to preserve it.

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