AUTOMATION OF CHLORINE DOSAGE ADJUSTMENT CALCULATION IN DEEP TUBULAR WATER WELLS USING A JAVASCRIPT AND HTML SCRIPT

Background: Chlorine, in the form of sodium hypochlorite (NaClO), is widely used in water treatment to make it safe for human consumption. There are three main forms of chlorine: chlorine gas (Cl2), sodium hypochlorite (NaClO), and calcium hypochlorite. All are effective in water disinfection. Chlorine dosage is controlled to eliminate pathogenic microorganisms without exceeding safe limits for human consumption, aiming to avoid the use of excessive chlorine that can generate undesirable by-products. Measurement was carried out using DPD reagent to determine the concentration of free chlorine in the water. Aim: This work aims to facilitate the adjustment of chlorine dosage in water treatment, to reduce additional corrections. Methods: The Hach method 8021 was used to adjust chlorine dosage based on measurements of the interval between dosing pump pulsations and observed chlorine concentration. The concentration was adjusted from 1.68 mg/L to 1.20 mg/L. Additionally, the appropriate time for correct chlorine reading was determined, and the time needed for the corrected chlorine quantity to be observable in the system, adhering to the minimum limits set by legislation, was verified. Results: The adjustment of the initial chlorine concentration (1.66 mg/L) was carried out using the Hach method 8021, resulting in a stable concentration of approximately 1.19 mg/L. The desired dosage was 1.20 mg/L. The time required for correct chlorine measurement and observation of the corrected value was approximately 40 minutes. The use of the script allowed achieving a result 99.2% close to the planned value with just one adjustment. Discussion: The proper use of chlorine in water treatment is essential to ensure the safety and quality of supply. This research emphasized the need for careful monitoring of chlorine dosage, requiring time and accurate analysis of representative samples. The application of the developed script brought significant benefits, ensuring satisfactory disinfection and preventing overdosing issues. The results showed high efficacy and time savings, enhancing treatment efficiency and economic advantages. Moreover, the script reduced paper usage in calculations, promoting environmental sustainability. Conclusions: The script for adjusting the chlorine dosage used in water treatment made the operation more practical and efficient, with a user-friendly interface and accurate results achieved faster.