CHLORINATION BY-PRODUCTS IN INDOOR SWIMMING POOLS: YEAR-WISE MONITORING STUDY


Genişoğlu M., Minaz M., Tanaçan E., Sofuoğlu S. C., Kaplan Bekaroğlu Ş. Ş., Kanan A., ...More

10th International Conference on Swimming Pool & Spa, Bologna, Italy, 14 - 17 February 2023, pp.18

  • Publication Type: Conference Paper / Summary Text
  • City: Bologna
  • Country: Italy
  • Page Numbers: pp.18
  • Recep Tayyip Erdoğan University Affiliated: Yes

Abstract

Chlorination is the most common method for disinfection of pool water in Turkey. Despite the chlorination of swimming pools ensuring microbial safety to prevent water-borne diseases, a reaction between organic compounds, dissolved ions, and chlorine forms the toxic disinfection by-products (DBPs). Indoor swimming pools are abundant environments due to continuous disinfection and input of precursors from swimmers. Trihalomethanes (THM) and haloacetic acids (HAA) are the most abundant DBPs in swimming pools. In this study relation between pool water quality parameters and DBPs concentrations were investigated with a year-wise monitoring campaign in two indoor swimming pools (SP-A and SP-B). Before the monitoring campaign, both pools were cleaned and refilled with individual operating procedures. While SP-A was refilled with a chlorinated drinking water distribution system, SP-B was refilled directly with groundwater. THM, HAA, and Haloacetonitriles (HAN) were the targeted DBPs. Free chlorine, UV254 absorbance, Dissolved Organic Nitrogen (DON), Total Organic Carbon (TOC), and Adsorbable Organic Halides (AOX) concentrations were weekly analyzed during year wise monitoring campaign. While the average pool water THM and HAA levels were determined to be 20.6 μg/L and 55 μg/L in SP-A, respectively, those were 69.6 μg/L and 385 μg/L in SP-B. HAN were relatively lower than the THM and HAA in both SP-A and SP-B might be due to the rapid degradation and low formation at pH>7. While the maximum HAN concentration was determined to be 2 μg/L, the average level was 2.90 μg/L in SP-B. Simple linear regression (SLR) analysis shows the co-occurrence of THM, HAA, and HAN were significant (r2 =0.63-0.77, p<0.01). THM, HAA, and HAN concentrations were determined to be strongly related to DOC, DON, and AOX levels. Also, SUVA254 was related to THM and HAA concentrations, while not related to HAN. SLR models might be used to estimate DBP levels in sample pools without the need for a complicated sample preparation process, chromatography analysis, and expensive analytical instruments.