DETERMINATION OF OPTIMAL PARAMETERS IN STABILIZATION PROCESS OF UNDERGROUND WATERS STABILIZATION IN WATER SUPPLY SYSTEMS FOR SMALL SETTLEMENTS

Abstract

The paper presents data of monitoring studies of underground waters aggressiveness degree in the systems of economic drinking water supply in settlements of north-western regions of Ukraine. It is determined that in 80% of researched settlements water consumpion with different aggressiveness level takes place. It is shown that main natural factors of influencing the processes of stability change in natural underground waters are pH values decrease, anthropogenic factors impact, low alkalinity reserve, presence of aggressive carbon dioxide. It is established that water aggressiveness level increases with the growth of iits stay duration in waterpipe network and also with the presence of dead-end parts. The optimal dosages are determined of lime milk clarified solution both for supporting water stability and for forming protective film (16 mg/dm3). Dependencies are determimed of the change of calcium ions concentration and pH on the amount of recirculations in studied lime solution under calcium concentratio 1000 mg/dm3. According to experiment data there had been 6-times solution exchange under single-stage 20 g lime loading. Minimum concentrations are determined of Са2+ ions in theopwrating solution necessary for carrying out water stabilizationprocessing (800 mg/dm3). Results of correcting rates of operatingsolution of clarified lime milk depending on Са2+ ions concentration change in a settler-recirculator are presented. It is proved that with the decrease of calcium concentration in lime solution the expenditure of the dosage pump increases. Relationships of the dosage pump rates on the deironing station expenditures during the filtration cycle under different calcium ions concentrations are determined.