METHOD OF CLEANING DRAINAGE WATER OF SOLID DOMESTIC WASTE LANDFILLS

摘要

FIELD: ecology; chemistry.;SUBSTANCE: invention can be used for treatment of concentrated waste water with hard to oxidise organic impurities and toxic compounds. Method of cleaning drainage waters of solid domestic waste landfills includes steps of: electrochemical treatment 4 with release on anode of active chlorine, two-step filtration and reverse osmosis separation. Electrochemical treatment 4 is supplemented with a second step 5 with generation at anode of hydroxyl radicals. Before filtration step of second stage 19, method comprises reagent treatment with coagulant 8, NaOH solution 10 and flocculant 12 with subsequent settling 14. At filtration step, of second step used is hollow-fibre ultrafiltration 19 with reverse-accurate pulsing rinsing. Reverse-osmosis separation is carried out in two steps on permeate. Permeate of reverse osmosis of first step 28 is subjected to blowing by air 29 to remove at least 95 % carbon dioxide. Method then includes adding to permeate sulphate ions 30 and subjecting to additional separation at second step of reverse osmosis 32. Produced permeate of reverse osmosis of second step 32 is further purified on ion-exchange resins in Cl-form 35 and Na-form 36.;EFFECT: invention increases degree of purification of drainage water of solid domestic waste landfills from hard to oxidise organic impurities and toxic compounds, reduces operational costs and power consumption.;6 cl, 8 tbl, 1 dwg