Such boards are also referred to as plasterboards, drywall, wallboards and gyprock. Gypsum waste in some countries also consists of gypsum blocks and plaster, among others. Three main types of gypsum waste based on their origin can be distinguished:  Gypsum waste from the manufacturing of gypsum products.
This waste, which arises at the industrial gypsum production sites, consists of rejects and non-spec materials generated during the manufacturing of gypsum products. The recycling of this waste stream is usually part of the waste avoidance activity of the gypsum plants.
Denver lumber recycling dating
Gypsum waste from new construction activities is typically a clean waste, and primarily consists of off-cuts of plasterboard drywall, wallboard or gyprock when the boards have been cut to fit the datings denver lumber recycling of the wall or ceiling. Gypsum waste from demolition and reconstruction This waste arises when already installed plasterboards drywalls, wallboards or gyprock boardsthat usually have been installed many years ago, are taken out in connection with that the building is demolished or renovated.
Different from the two other types of gypsum waste described dating denver lumber recycling, this type of gypsum waste from renovation, refurbishment and demolition works is more likely to present a certain degree of contamination, which can be in the form of nails, screws, wood, insulation, wall coverings etc.
For this waste to be recyclable it is required that the equipment processing the waste is capable of separating such contamination from the gypsum to arrive at a pure recycled gypsum. New construction and demolition gypsum waste is both arising after the gypsum products have left the manufacturing sites, and together these two waste types are referred to as post consumer gypsum waste.
The recycled gypsum obtained from this is known as post-consumer recycled gypsum.
Gypsum dating denver lumber recycling such as gypsum blocks and plaster do not require the removal of paper, as they are not made with paper from the beginning. It is typical for the gypsum recyclers to accept up to 3 per cent of contamination from other materials. The professional recyclers are capable of handling gypsum waste with nails and screws, wall coverings etc.
Why should gypsum waste be recycled? Sulfate-reducing bacteria convert sulfates to toxic hydrogen sulphide gas; they are killed by exposure to air, but the moist, airless, carbon-containing environment in a landfill is a good habitat for them.
So gypsum put into landfill will decompose, releasing up to a quarter its weight in hydrogen sulfide.
Recycling one ton of the ordinary gypsum will save 1, pounds of black alkali, 1 ton of lactic acid and kwh of energy. Closed loop recycling of gypsum products involves the collection and processing of the gypsum waste, and the delivery of the obtained recycled gypsum to the manufacturer of gypsum products.
It is therefore essential that the recycled gypsum achieves a pre-determined quality suitable for the manufacturing of new gypsum products. Presently there is no European or American standard pre-determining the recycled gypsum's quality and the criteria vary from plant to plant.
By choosing closed loop recycling the dating denver lumber recycling for manufacturers to acquire virgin gypsum is reduced, contributing therefore to promote a sustainable manufacturing process. The most advanced plants, and most of these are found in the Nordic countries in Europe, have substituted up to 30 per cent of virgin gypsum raw materials with recycled gypsum.
Today also new recyclers have emerged and gypsum recycling systems have been introduced in more countries, like the UK, France and in the Benelux, but the highest recycling rates for gypsum waste are lumber recycling found in Denmark, Norway and Sweden. This recovered gypsum is then distributed to agricultural and industrial customers in the region keeping the wallboard from ending up in the landfill.
New West Gypsum Recycling began recycling of wallboard waste in Canada in The recycled material is a blend of pre- and post-consumer, wet and dry gypsum waste that is a source of raw material for use in the manufacture of new drywall products.
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Gypsum Agri-cycle is one of the first companies to recycle drywall in the USA. Gypsum Agri-cycle is another North American recycler of new construction drywall located in Pennsylvania.
Pennsylvania does not allow Gypsum Agri-cycle to recycle demolition drywall. Zanker Recycling began recycling gypsum in the form of sheetrock in In the recycling process, materials such as wood, metals, and trash are removed on-site where a dozer is used to crush the materials. His vision for the company is to transform the Northwest drywall waste stream into a valuable product for agriculture and industry.
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USA Gypsum located in Denver, PA provides both closed loop recycling and up-cycling reclaimed gypsum to higher value gypsum products such as agricultural gypsum.