Experimental research on the application of technologies of treatment/drinking and water purge to improve their management

Abstract

The studies carried out within this project, in phase 1/2018, focused on two directions: the first direction of research aimed at the growth and development of Lemna minor L. plants; the second direction concerned the analysis of the heavy metal wastewater treatment capacity of the Lemna minor plant. In order to determine optimal plant growth conditions, nine variants of growth were studied through the variation of micro and macro-nutrients, and in particular of the compounds with phosphorus and nitrogen. The degree of plant development in all experimental lots was between 150 and 325%. In phyto-remediation studies, 4 types of water were used. Three of them had a monometallic content (zinc, copper, nickel), being waste water from the galvanizing processes, and one had a multimetallic content (zinc, iron, manganese), this being a mine water. Monometallic waters were diluted to determine the maximum tolerance of plant to metal. For zinc, the concentrations of 7.5, 15, 30, 50 and 75 mg / l were used; for copper 5, 10, 20, 30 mg / l; and for nickel 5, 15, 30, 50 mg / l. It is found that in general the cleaning efficiency decreases with the increase of the metal concentration in the water. The best purge yields are obtained at the lowest initial concentrations. Regarding the speed of bioaccumulation, it is found that it is high in the first 3 days, then there is a decrease in the following 4.