DETERMINATION OF THE TOXICITY OF AQUEOUS EXTRACT FROM WASTE PROCESSING OF PHOSPHATE RAW MATERIALS USING BIOTESTING ON HYDROBIONTS

The biotesting method was used to assess the individual and combined effects of waste from the production of phosphate raw materials at the designed chemical complex of the EuroChem-Karatau company (Republic of Kazakhstan). The goal of the study was to determine the hazard class of waste from the production of phosphate raw materials using biotesting method. Experimental study was carried out on test organisms: Daphnia magna Straus freshwater planktonic crustaceans. It has been established that Daphnia magna is sensitive to waste from the processing of phosphate raw materials, and the samples under study belong to practically non-hazardous and low-hazard waste with the possibility of processing for the purpose of their further use. On hydrobionts, water extracts without dilution from a mixture of waste module CCP + cake module 1A (1:1), cake module 1A and synthetic gypsum did not have an inhibitory effect. An ecological and toxicological study confirmed that the studied samples belong to the fifth class of environmental hazard (virtually non-hazardous). For the aqueous extract from the waste of the CCP module without its dilution, inhibition of the viability of aquatic organisms was revealed. The death of Daphnia may be associated with waste components that cause blockage of the respiratory tract with dispersed particles. It was revealed that with increasing dilution, the mortality rate of Daphnia decreases; the 10-times dilution ratio had no effect on hydrobionts.