WATER-SOLUBLE HUMIC ACIDS, A METHOD OF OBTAINING THEM, A METHOD OF DETOXIFYING LAND AND EFFLUENT SEDIMENTS, AND A METHOD OF RECULTIVATING AGRICULTURAL LAND WITH THE AID OF THE PROPOSED WATER-SOLUBLE HUMIC ACIDS

摘要

The method for detoxication of sewage sediment containing heavy metal cations, comprises adding to the mentioned sewage sediment under constant stirring, the mentioned novel humic water-soluble humic acids in an amount found from the following formula:$\mathop{\mathrm{image}} \[ \text{M ≧}\frac{\text{q x m}}{\text{a x G}}\text{x 100\%,} \]$ where:Mis the weight of humic acids, kg,qis the content of mobile cations of heavy metals in sewage sediment, mg x eq/kg,mis the weight of the sewage sediment subjected to detoxication, kg,ais an exchange capacity of the humic acids used, in terms of cations of heavy metals, mg x eq/kg,Gis the concentration of humic acids, wt.%,;The result is the formation of water-insoluble compounds of humic acids with ions of heavy metals present in the sewage sediment, thus ensuring detoxication of the sewage sediment.