engleski

Removal of arsenic, phosphates and ammonia from the well water using electrochemical methods - a pilot plant approach

Groundwater of the Pannonian basin which covers the parts of Hungary, Romania, Croatia, Serbia and Slovakia represents the complex system with elevated to high values of heavy metals and arsenic, color, turbidity, suspended solids, ammonia, and other nutrients as well as natural organic matter. When considering the human health risk, among the mentioned contaminants, arsenic is of the highest importance. The purpose of this work was development of the pilot plant purification system and its application onto groundwater taken from the production well water in the Vinkovci County (Eastern Croatia). The highest increase of the parameters over upper permissible limit UPL was found for the arsenic (13.8 times), phosphates (11.7 times), color (6.2 times), mercury (4.7 times), turbidity (3.3 times), ammonia (2.4 times), nickel (1.8 times) and iron (1.5 times). Due to the complex composition of the treated water, the purification system consisted of the combined electrochemical treatment, using iron and aluminum electrode plates with simultaneous ozonation followed by post treatment with UV, ozone and hydrogen peroxide. The combined treatment resulted in the total removal of arsenic, phosphates, color, turbidity, suspended solids and ammonia while the removal of other contaminants of interest was up to 96.7%.

Heavy metals ; arsenic ; ammonia ; electrocoagulation ; ozonation ; iron anode ; aluminum anode ; hydrogen peroxide

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