LANE TURNERS are the first choice for maximum emission control: they achieve the best results when used in closed halls with biofilters. Turning with a BACKHUS CON in combination with the CONVAERO membrane causes hardly any odour emissions as well, as these are retained by the membrane. With BACKHUS windrow turners, this depends on whether you use the windrows outdoors without a cover or, for example, in a hall with a biofilter.

It may confuse, but composting does not necessarily always aim to create "compost" in the sense of a marketable product. Basically, the word "composting" describes the natural conversion of organic material into humus by bacteria in a rotting process. If this "compost" has a high degree of purity, it can ultimately be used as fertiliser. However, materials are often composted that cannot be used as fertiliser from the outset. Municipal solid waste (MSW) in particular often contains high levels of organic matter, which can hardly be separated from the rest of the waste – nevertheless, composting or biological drying is recommended for the following reasons:

• Volume Reduction
  Waste with a non-composted organic content has a significantly higher volume, which makes landfilling more difficult. In addition to processing the material with shredders etc., regular turning is therefore also an efficient method of significantly reducing the volume.
• Higher Calorific Value
  Non-recyclable waste such as residual waste is largely treated thermally. The organic fractions contained therein consist to a large extent of water and the high moisture content therefore increases the energy requirement during incineration. Biological drying with a membrane or complete composting before thermal treatment are therefore often more cost-effective.
• Emission Reduction – Temperature 
  During composting, temperatures of up to 65 degrees are generated. If municipal waste is not treated before landfilling, uncontrolled composting takes place. The landfill then heats up considerably and hazardous pollutants can escape in combination with the other waste
• Emission Reduction – Gases
  Controlled composting with turners also produces C02, but landfilling untreated material is many times more harmful to the climate. Methane and nitrous oxide are quickly produced in cavities that are sealed off from the oxygen supply. This can be avoided by regular turning.