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mill waste

Waste management is an expensive process. Transportation, handling and disposing waste not only costs businesses a lot of money but also increases their environmental impact. However, today, businesses can make money out of their waste with the help of advanced waste recycling systems such industrial shredders. Such recycling equipment are designed to efficiently shred, sort and recycle waste into reusable and valuable products.

How is Mill Waste Recycled

  • Industrial shredders used for this purpose usually consist of a heavy hammer mill for pulverizing the waste and a subsequent sorting step which separates a heavy and a light fraction. The heavy fraction section contains metal which can be recycled and the light fraction contains a lot of plastics as well as fine inorganic materials like sand, dust, rust and glass, as well as other metals and organic compounds.
  • The shredder light fraction or the SLF can be separated into plastics, fines and fluff with the help of mechanical processes. Plastics can be recycled in multiple ways such as using it as a reduction agent for the blast furnace process. The fines are also known as inert fraction or sand mainly comprised of minerals and have a very low content of organic carbon, hence can be landfilled. The fluff contains a substantial portion of fibres and hence there is scope for improving its recycling rate.
  • Fibre handling and recycling is a challenge because of entangling. However, the new advancements in technology have made it possible to overcome this challenge to simplify the processing of fibre. The products that are obtained can be used as a substitute for well-established products which are based on fibres as well as for varied construction materials.

Why Waste is an Opportunity

Recycling mill waste is a profitable opportunity as it is a source of renewable energy and valuable by-products such as metals. This helps generate an internal fuel source, eliminate disposal expenditures, avoid landfill over-crowding and above all helps to curb the environmental footprint of the industries.

  • Converting Waste to Fuel – Steam can be produced by combusting mill residuals such as sludge and dewatered rejects. This steam can then be used directly in the paper mill or used to produce power by feeding into a turbine-generator. The heat required for generating steam can either be produced by burning waste in a controlled environment or by generating a fuel gas which can be processed further or burned. Different technology is used for converting waste into fuel. For processing the rejects and preparing them for conversion, front-end technologies are used. For converting waste into solid, liquid or gaseous fuels, downstream processes are employed.
  • Making Mill Waste Profitable – Every mill waste-to-value requirements differ a bit. Hence, the approach for structuring a solution is based on that mill’s specific requirements and goals. However, standard modules can be combined with the customized solutions while keeping the core strategy the same. This includes an analysis of the waste streams to determine the amount of valuable compounds and heating values of potential fuels, the equipment and the desired result. The different steps involved in this mill waste recycling process are as follows:
  1. Rejects Handling – With the help of a separator, unwanted  debris like bricks, stones and valuable compounds like plastic bottles or cans are removed from the reject stream.
  2. Sludge Handling – Post pre-thickening by gravity, fibrous sludge is dewatered on belt presses with high pressures. Sludge removal from biological water treatment is a bit challenging but flexible belt presses make this process easy.
  3. Drying – This process when carried out in a closed system, the heat in the drying air can be recovered and utilized. This helps reduce overall energy consumption.
  4. Pelleting – This is is a great procedure to prepare pellets which have low moisture content. This makes them easy to transport and store. Wood pellets are widely used in residential heating systems.
  5. Pyrolysis and Combustion – These processes are used to convert complex waste products back into resources which eventually make prominent contributions towards environment conservation.

If you too are looking for industrial shredders or any other types of recycling equipment to turn your mill waste into profits, get in touch with our recycling experts at Northern California Compactors Inc, today. They will help you choose the perfect equipment so that your business can achieve a greener and a more profitable bottom line.