Name : [in Japanese]
Location : [in Japanese]
Date : January 18, 2017 - January 19, 2017
Pages 83-84
In order to recycle wood ashes back to the places of biomass production as fertilizer, modifications of their solubility are necessary. To evaluate of the effects of lignosulfonates on the solubility of ash components, the aqueous extracts of the wood ashes stabilized by water (40 % of solid weight) and various additives (5% of solid weight): calcium hydroxide, calcium lignosulfonate, and magnesium lignosulfonate were compared. The curing period of 28 days changed pH level of the extracts from 13 to 11 and reduced electrical conductivity from 2.8 to 0.79 S/m. The declines in pH and electrical conductivity were slightly enhanced by lignosulfonates. The additions of lignosulfonates decreased the solubility of toxic trace metal elements, such as chromium, while those suppressed the weight gain of the stabilized ashes, which indicates that lignosulfonates tend to inhibit the deposition of insoluble carbonates on moist ash surfaces.
