Process and apparatus for storing and compressing waste
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Biological filter for purifying water, includes tank for retarding flow of water entering distribution filter
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Treating effluent to reduce nitrogen, phosphorous and oxygen-consuming substances content comprises a multi step biological process using peat, combination of peat and bark, limestone and leca beads
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Device for ventilation, oxygenating, air cleaning and heat exchange
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Cylindrical sieving and composting device and a method using the device
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Appts. for optimising degradation of biological waste in composting
