Removal of precursors of chlorinated organic compounds in selected water treatment processes

摘要

This paper discusses the impact of coagulation, ozonation and adsorption on the activated carbon, the content of precursors of chlorinated organic compounds. Coagulation guaranteed the effective elimination of non-biodegradable organic substances and essentially did not impact the biodegradable dissolvent organic carbon (DOC) concentrations. The coagulation process brought about a decrease in concentration for all analysed fractions of organic substances. The removal efficiency of organic substances was higher for mixed water than surface water (SW). Conversely ozonation lowered the biological stability of water by increasing the biodegradable DOC concentration, while only marginally causing the mineralisation of refractive substances. The non-biodegradable organic substances' mineralisation level for the water samples was between 0.00-1.35 gC/m~3 (for SW) and 0.02-0.46 gC/m~3 (for infiltration water). In general, a higher mineralisation level was registered for SW. Adsorption, despite its substantial removal effectiveness, did not cause the total elimination of high-molecular weight organic substances. In general, total and dissolved organic carbon was more effectively eliminated from SW, probably due to higher pre-adsorption concentration levels in SW. All analysed processes decrease the potential to create chlorinated organic substances through a disinfection process.