Перегляд за Автор "Hrebeniuk, Tatiana"

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Examining the efficiency of electrochemical purification of storm wastewater at machine-building enterprises
(2018) Мaksimenko, Оlena; Pancheva, Natalia; Madzhd, Svitlana; Pysanko, Yana; Briankin, Оlena; Tykhomyrova, Tatiana; Hrebeniuk, Tatiana
The composition of contaminated stormwater from the territory of an engineering enterprise is investigated. It was found that the territory is unevenly polluted, and among the pollution of surface runoff water from the territory adjacent to the production workshops, copper ions prevail up to 1.1 mg/dm3, zinc up to 2.0 mg/dm3, nickel up to 1.6 mg/dm3, chromium 0.93 mg/dm3 and lead up to 5.0 mg/dm3. It has been proved that the following factors significantly affect the removal of metal ions during electrocoagulation treatment: flow rate of wastewater entering the treatment for purification; the time of settling of wastewater after and the current density during electrolysis. On the basis of experimental studies, graphical dependences of the purification efficiency on the current density and water settling time were constructed. The optimal parameters of the wastewater treatment process have been determined, which ensure a sufficiently high efficiency of water purification from heavy metal ions. ions (up to the values of the discharge standards) at an acceptable power consumption. It was found that the best conditions for nickel and lead precipitation are a current density of 50 A/m3 and a settling time after electrocoagulation for 9 hours. Optimal conditions for copper and zinc precipitation are 12 hours, and reducing the chromium concentration to safe concentrations is possible at a current density of 10 A/m3 and a settling time of 4 hours. It was found that the efficiency of of metal ions purification significantly increases with the increase in current and settling time, in addition, the efficiency of settling is 1.4-3 times higher than the increase in current density