Wind Sifting Cuts Volume Losses

Plastic-free with Airflex 1500 made by Doppstadt

Plastic is everywhere, and sadly, it often ends up in many green waste bins as well. This causes composting site operators a lot of problems.

They have to carefully separate the unwanted bags and other plastic components from the organic waste in order to comply with legal regulations of the German Fertilizer Ordinance (DüMV). However, composting site operators also want to achieve their own goal and offer high quality products to their customers, who are involved in the compost, gardening and agriculture industries.

For this reason, the Germany Federal Compost Association, in short BGK (Bundesgütegemeinschaft Kompost), responsible for awarding the RAL (German National Committee for Delivery Conditions) quality seals to compost products, stiffened up the requirements concerning unwanted materials: now, only 15 cm² of plastic elements per litre of compost will be tolerated, instead of 25 cm², as before. And very soon, the organic farming regulations will only permit usage of composts with less than 10 cm² of plastic.

All this is creating huge challenges for composters, which they can barely overcome just by using even finer screening: they would simply lose too many sellable fractions and find themselves in a precarious economic situation. Doppstadt, which specialises in environmental technology, has created the Airflex 1500, which provides the technical solution for processing compost. It is a wind sifter that minimises the losses of compost product by improving its quality. To achieve this, the compost undergoes initial rough screening at 15 mm. The fines < 15 mm are than efficiently separated from unwanted materials in the Airflex 1500 in two stages. In the first step, a powerful centrifugal fan separates heavy materials such as glass, stones and metals. In the second step, a suction fan pulls away unwanted plastic films etc. The result is a compost that complies with the requirements of the RAL quality seal. Perfect, and almost plastic-free – Doppstadt‘s contribution for sustainable recycling management.


Related articles:

Issue 2021-03 Black gold

„There will probably never be a biowaste that is completely free of impurities!“

Just like other composting plant operators, Hubert Seiringer from Wieselburg (Lower Austria) struggles with the impurities in the organic waste that is delivered. As a committed composting plant...

Issue 2021-06

The IFE AEROSELECTOR inspires the professional audience

The International Compost Practitioners‘ Day Compost on 23 September 2021 was attended by around 700 visitors from Austria and abroad who showed great interest in the first live demonstration of...

Issue 2018-01 Removal of foreign particles

Production of high quality organic material with the UniSort Black from STEINERT

According to the RAL quality assurance method for compost (RAL-G2-251), only 25 cm² of foreign particles are permitted per litre of fresh substance in fresh and finished compost. This value will be...

Issue 2019-03

A look ahead

Dear reader, Plastic does not have the best image. Plastic waste in oceans and rivers is a topic that resounds throughout the land while the resulting consequences for the residing species as well as...

Issue 2021-05 Practical

Separation of impurities with the AEROSELECTOR

On 1 June, IFE unveiled the latest addition to its environmental technology portfolio: the new AEROSELECTOR – a unique combination of wind sifting, ballistic separation and screening. From moist as...