KEShui-zhou,ZHANGChun-yu,OUYANGLin,et al.Ozone Attenuation Model and Operation Control of Building Pipeline Direct Drinking Water System[J].China Water & Wastewater,2024,40(15):9-15.
Ozone Attenuation Model and Operation Control of Building Pipeline Direct Drinking Water System
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第15期
Page:
9-15
Column:
Date of publication:
2024-08-01
- Keywords:
- pipeline direct drinking water; ozone attenuation; Pseudomonas aeruginosa; circulating disinfection; orthogonal optimization
- Abstract:
- In order to optimize the ozone disinfection process and ensure the safety of pipeline direct drinking water，the static and dynamic tests of ozone concentration attenuation were carried out. The results showed that the attenuation model of ozone concentration in clean water tank with time conformed to the binomial fitting curve, and the half-life was about 30-45 min. When the initial concentration of ozone in the clean water tank was 0.06 mg/L, 0.12 mg/L and 0.18 mg/L respectively, the residual concentration of ozone was above 0.01 mg/L after standing for 120 min. When the ozone dosage in the clean water tank was 0.06 mg/L, 0.12 mg/L and 0.18 mg/L respectively, the ozone concentration at the water point first increased with the increase of time under the condition of no circulation and no effluent, and began to decrease after a period of time, and was less than 0.01 mg/L after 150 min. Under the condition of effluent and non-circulation, with the increase of outflow or ozone dosage, the time required for the ozone concentration at the water point to decrease to below 0.01 mg/L increased correspondingly. After opening the cycle, the greater the outflow or the ozone dosage, the shorter the time required for the terminal ozone concentration to reach 0.01 mg/L. The optimization test of circulating disinfection system showed that the degree of influence on the total number of colonies and the detection of Pseudomonas aeruginosa was as follows: ozone dosage > number of daily cycles > time of each cycle. When the ozone dosage reached 0.13-0.18 mg/L, cycling 8 times a day and 15 min each cycle, the number of Pseudomonas aeruginosa detected at the water point could be basically ensured to be zero.
Last Update:
2024-08-01