METHOD OF REPROCESSING BIOGENIC WASTE SEDIMENT, PRODUCTS OF THAT REPROCESSING AND A METHOD AND DEVICE FOR CARRYING OUT THE PROPOSED METHOD

摘要

The proposed method of reprocessing biogenic waste sediment involves heat treatment of a suspension of sediments (15) at a temperature of 150-220 DEG C and pressure of 0.5-3.0 mPa for 10-120 minutes; alkalization of the suspension thus treated to produce a pH of more than 10 (17); and subsequent treatment with an oxygen-containing gas (18) at a temperature of 150-220 DEG C and pressure of 1.5-5.0 mPa for between 20 and 180 minutes. Once the pressure has fallen to atmospheric pressure and the temperature has dropped below 100 DEG C, the reaction material is divided (2) into a liquid-phase organo-mineral complex and an insoluble sediment component. Treatment with oxygen-containing gas is carried out in a device for reprocessing biogenic waste sediments (gas lift apparatus) (18) which facilitates mass-exchange processes in three-phase systems (liquid-gas-solid). The insoluble sediment component contains heavy metal salts and organic substances chemically bonded to those salts and can be used as raw material in the production of construction materials. The liquid product is a solution of organo-mineral complex containing water-soluble salts of high-molecular carboxylic acids with the properties of humic substances. The organo-mineral complex can be used in various areas of technology and agriculture.