Extraction of mineral elements from inedible wastes of biological components of a life-support system and their utilization for plant nutrition.

Two methods of extracting mineral elements from otherwise deadlock products of a life-support system are presented. We describe first optimum conditions for recovering elements by water extraction from dry wastes of plants, biomass ash, and solid human wastes after passing them through the catalytic furnace; and, second, we describe acid extracts of biogenous elements by 1N and 2N HNO3 from these products. Ways to use the extracts of elements in plant nutrition are considered in order to increase the extent to which the mineral loop of a life-support system can be closed.

[Determination of the limits of the physiological action of mineral elements in hydrogen bacteria].

The growth of the hydrogen bacterium Hydrogenomonas eutropha Z-1 was studied in the conditions of continuous cultivation at different content of mineral elements in the medium. The physiological action of phosphorus, sulfur, potassium and magnesium in the bacterium was found to be displayed within a wide range of concentrations (mg/ml): P, 18-1400; S, 5.5-350; K, 4-550; Mg, 4.