The aim of the work is to give eco-technological substantiation of using waste rock from slagheaps in the composition of filtering material for the technology of irrigation water treatment for drip irrigation. At the stage of assessing the relevance of the study, prevented damage to land resources from using burnt rocks of slagheaps according to existing methodology for determination of prevented ecological damage was established, and hazard class of burnt rock as an industry waste was determined by calculating method according to SP 2.1.7.1386-03. The content of heavy metals in waste rock and natural water before and after the treatment was determined by atomic-absorption spectrometer according to PND F 14.1:2:4.139-98, GOST 27395-87, PND F 16.1:2:2.2.3.36-2002. Suspended solids in irrigation water were detected by gravimetric method according to RD 52.24.468-2005. Considering such indicators of main components of burnt slagheap rock as maximal allowable concentration of a substance in soil, hazard class of a substance in soil, the average dose of a substance that causes death of half of the members of a test group of animals, and carcinogenicity for humans accounting the proportion of a substance in a whole volume allow corresponding waste hazard to IV hazard class. The content in water of such metals as zinc, lead and cadmium had no change; their concentrations were 0.003, 0.005, and 0.002 mg per cubic decimeter respectively. Change of iron quantity in the analyzed water was 2.0–2.5 %, manganese – 3.0–3.5 %, copper – 2.2–2.7 %, nickel – 4.0–4.5 %. In the experiment, at an average concentration of suspended solids decreased from 67–62 mg per cubic decimeter in original irrigation water to 4.7–4.8 mg per cubic decimeter, the effect on suspended solids from treatment by filtering element was 84–87 %.
Keywords: burnt waste of slagheaps, irrigation water treatment, hazard class of waste, filtering element, suspended solids.
