Effective waste management in mill facilities is of critical importance for both environmental sustainability and economic efficiency. Various types of waste generated by the nature of the sector can be transformed into opportunities that reduce operational costs and minimize environmental impact when approached correctly. As Tanış A.Ş., with over 60 years of industry experience, we offer comprehensive solutions to optimize waste management strategies for mill facilities and accelerate their transition to circular economy. This content includes practical information and strategies for sustainable waste management and circular economy applications for mill operations.
The largest waste category in mill facilities consists of process waste generated during wheat cleaning and grinding stages. Foreign materials such as stones, stalks, ears, and other impurities separated during the cleaning stage constitute approximately 5-10% of the total waste volume. Regular characterization of these wastes is essential for determining appropriate management strategies.
By-products such as bran, middlings, and germ resulting from the grinding process constitute 25-30% of the total wheat weight. These by-products can be utilized as animal feed, food supplements, or bioenergy raw materials due to their rich nutritional content. For an average mill facility with a daily processing capacity of 100 tons of wheat, approximately 25-30 tons of by-product formation occurs.
Fine dust and fragments under sieves are other process wastes formed during the milling process. This material constitutes 1-2% of the total wheat weight and is generally utilized in animal feed formulations.
Waste from product packaging and logistics processes in mill facilities constitutes an important category. Materials such as flour sacks, pallets, stretch film, and tape are wastes that need to be collected and managed regularly. A medium-scale mill can produce approximately 5-10 tons of packaging waste annually.
Waste oils, greases, chemicals, metal parts, and electronic waste resulting from maintenance activities can fall into the hazardous waste category. Proper disposal of these wastes by authorized organizations is a legal requirement. In a typical mill facility, approximately 500-1000 kg of maintenance-related hazardous waste formation is observed annually.
Wastewater and Emissions
Mill facilities have wastewater from processes such as wheat washing, tempering, and equipment cleaning. A mill with a daily capacity of 100 tons can produce approximately 5-10 m³ of process wastewater. The organic matter, suspended solids, and cleaning chemicals contained in these waters require treatment before discharge.
Dust emissions are a prominent environmental impact, especially during wheat receiving, cleaning, and grinding processes. Modern dust collection and filtration systems can reduce these emissions by 95-99%. The collected dust is generally included in by-products and utilized as animal feed.
Waste Management Hierarchy Principles
Sustainable waste management in mill facilities is based on waste hierarchy principles. This hierarchy consists of prevention, reduction, reuse, recycling, recovery, and disposal stages. The most prioritized approach, waste prevention and source reduction, can be achieved through process optimization, equipment efficiency, and employee training.
In modern mill designs, process efficiency can be increased to reduce waste rates below 0.5%. Quality control of raw materials and optimization of equipment settings play a critical role in minimizing waste generation.
Zero Waste Certification and Implementation Steps
Zero waste is an approach that is gaining increasing importance in the sustainability goals of mill facilities. The first step to apply for zero waste certification is to create a comprehensive waste inventory. This inventory should include all waste types, quantities, sources, and existing management methods.
The necessary steps for establishing a zero waste management system are:
- Waste characterization and inventory study
- Determination of waste reduction targets
- Creation of waste separation infrastructure
- Organization of employee training programs
- Establishment of monitoring and reporting systems
- Development of continuous improvement mechanisms
A successful zero waste program can reduce the amount of waste sent to regular landfills by over 90% in an average mill facility.
For effective waste management, it is essential to establish appropriate waste separation and collection systems in the facility. Separate collection stations should be created for hazardous waste, recyclable waste, organic waste, and domestic waste. Waste containers should be labeled with international color coding (blue-paper, yellow-plastic, green-glass, gray-metal, brown-organic) and clear instructions should be available for each waste type.
In-facility waste collection points should be positioned close to operational areas but designed to prevent product contamination risk. Temporary storage areas should be equipped with waterproof flooring, appropriate ventilation, and fire safety measures in accordance with legal requirements.
Bran and Middlings Evaluation Methods
Wheat grinding by-products such as bran and middlings can be evaluated as valuable raw materials due to their rich nutritional content. While the most common area of use is the animal feed sector, the current trend is towards using these by-products in higher value-added applications.
Bran is utilized in functional food products, low glycemic index flours, and bread production due to its high fiber content (40-45%). Middlings, rich in protein (15-18%) and starch, are used in animal feed formulations and the fermentation industry.
Pelleting or compacting by-products at the production facility increases storage and transportation efficiency. Pelleted bran products can be sold at 15-20% higher prices compared to bulk form.
Wheat Embryo (Germ) Evaluation
Although germ constitutes only 2-3% of the wheat grain, it is the part with the highest nutritional value. It is rich in vitamin E, B vitamins, protein, essential fatty acids, and minerals. Due to this feature, it is considered a valuable raw material in the food supplement, cosmetic, and functional food industries.
Germ oil extraction provides a product worth 2,500-3,500 Euros per ton. The defatted germ meal is rich in protein (30%) and fiber and can be used as a nutritious food additive.
Modern stabilization technologies (enzyme inactivation, heat treatment, extrusion) extend the shelf life of germ, allowing it to be utilized in wider markets.
Organic materials separated during the wheat cleaning stage (stalks, straw, broken grains) can be used in composting or biogas production. A mill with 100-ton capacity can produce approximately 2-3 tons of organic cleaning waste daily.
For small and medium-scale mill facilities, simple composting systems can be established to convert these wastes into valuable organic fertilizer. For larger-scale facilities or facility clusters, biogas production may be more economically viable.
Mineral wastes (stones, soil, etc.) can be evaluated as construction fill material or soil improver after separation.
Packaging Waste and Material Recycling
Packaging Waste Management System
Significant amounts of packaging waste are generated in mill facilities. Flour sacks (PP, paper), big bags, pallets, stretch film, and cardboard boxes are the main components of this category. Recycling or reusing these materials provides both environmental and economic benefits.
A systematic approach is required for separate collection of recyclable packaging materials and their direction to licensed recycling facilities. Durable packaging materials such as big bags and pallets can be reused after cleaning or returned to suppliers.
Sustainability-focused mill operations are transitioning to reusable packaging systems. Deposit sack systems, durable and reusable big bags, and bulk delivery systems for industrial customers can be considered as alternatives in this context.
Reusable transportation and storage systems can reduce packaging waste by 60-80% and provide significant cost advantages in the medium term. For example, while a standard polypropylene sack can be used 1-2 times, high-strength reusable sacks can reach 20-30 usage cycles.
Management of Maintenance and Operational Waste
Hazardous Waste Management and Legal Requirements
Waste oils, solvents, chemicals, contaminated materials, and electronic waste generated during maintenance activities in mill facilities are generally classified as hazardous waste. Full compliance with legal requirements is critically important in managing these wastes.
Separate collection, appropriate labeling, and creation of safe temporary storage areas for hazardous waste are required. These wastes must be sent only through licensed carriers and to licensed disposal facilities, which is a legal obligation. Additionally, the facility is obliged to make an annual hazardous waste declaration.
Equipment Life Extension and Waste Reduction
Extending the life of mill equipment both reduces waste amounts and lowers operational costs. Predictive maintenance technologies and regular maintenance programs can extend equipment life by 30-50%.
Spare parts regeneration and remanufacturing is an effective approach in reducing metal, plastic, and electronic waste. For example, worn roller balls can be recoated to obtain several more usage cycles. The preference for renewable and repairable equipment is one of the fundamental elements of waste reduction strategy.
Wastewater and Dust Emission Management
Process-originated Wastewater Management
Proper management of wastewater from wheat washing and tempering processes in mill facilities is important for protecting water resources. Characterization of these waters generally shows high suspended solids and organic matter content.
With simple treatment systems (settling, filtration), a significant portion of these waters can be reused in the process. With advanced treatment technologies (membrane filtration, ultrafiltration), water recovery rate can be increased to 80-90%. A water recovery system in a medium-scale mill facility can provide annual water savings of 5,000-10,000 m³.
Dust emission is an important environmental impact and occupational health-safety issue in mill facilities. Modern jet filter systems, bag filters, and cyclones effectively control dust emissions. These systems provide dust capture efficiency of up to 99%.
Collected dust can be evaluated by including it in process by-products. Regular maintenance of dust collection systems and replacement of filter elements at optimum intervals are critically important for system performance and energy efficiency.
Our Waste Management Consulting Services
As Tanış A.Ş., we provide specialized waste management consulting services for mill facilities. Our waste audit and assessment studies include comprehensive analysis of all waste streams in the facility. Following this analysis, we contribute to the development of waste management strategy by presenting a detailed report showing the current situation and improvement opportunities.
Our zero waste certification consultancy provides support at every stage in the process of obtaining zero waste certificates for businesses. Preparation of application files, creation of necessary infrastructure, and organization of employee training are within the scope of this service.
Our Waste-reducing Technology and Equipment Solutions
Our low-waste mill systems contribute to source waste reduction by operating with high efficiency and minimum loss. Our process optimization-focused designs maximize raw material efficiency while minimizing waste generation.
Our ZeroEmission™ dust control technology reduces both environmental impacts and prevents valuable product loss with advanced filtration systems operating at 99.9% efficiency. Our WaterSave™ water saving and recovery systems can reduce water consumption in mill facilities by up to 70%.
Frequently Asked Questions
To obtain zero waste certification, first a comprehensive waste inventory must be created and current situation analysis must be performed. Then, waste reduction targets should be determined and in-facility waste separation infrastructure should be established. After organizing employee training and operating the system for at least 6 months, application can be made to the Provincial Directorate of Environment and Urbanization. As Tanış A.Ş., we provide consultancy support at every stage of this process.
The profitability of by-products varies according to the facility’s scale, location, and target markets. Generally, the most profitable approaches are:
- Germ separation and stabilization for food supplement market
- Evaluation of bran in functional food, healthy snacks, and premium animal feed formulations
- Making by-products compact and long-lasting with integrated pelleting system
- Bioenergy (biogas, biomass) production for large-scale facilities
Conclusion and Call to Action
Sustainable waste management both improves the environmental performance of mill facilities and increases their operational efficiency. With the right strategies and technologies, waste can be converted into valuable resources, costs can be reduced, and legal compliance can be achieved. As Tanış A.Ş., we are proud to be alongside mill facilities in this transformation journey.