'Water craftsman' to see who has steadier hands

Recently, in the city by the Federation of Trade unions, the city human resources and social security Bureau, the Communist Youth League sponsored, the city water Bureau, Nanjing Water supply and water-saving guidance center and other contractors of tap water production work skills competition site, 25 "water craftsman" site big competition.

All kinds of containers and reagents were placed on the operating table at the competition site. Five players were focused on each step of the operation of the experiment: sampling, calibration, titration, calculation, adding...... "The correct addition of the disinfectant project is to test who can control the residual chlorine in the effluent more accurately and smoothly to the target value of the assessment." According to Zu Zhenquan, chief judge and deputy director of Beihekou Water Plant, the competitors are provided with the target value of sand filter effluent, disinfectant of unknown concentration (sodium hypochlorite solution) and residual chlorine. The one who operates more standardized, more accurate and more stable will get higher score. During the competition, players should first determine the concentration of disinfectant, and accurately calculate the final dose of disinfection according to the amount of water in and the amount of disinfection consumed per unit volume of water, so as to ensure that the residual chlorine value of the effluent is close to the target value of the competition.

Adding concentration of 2.5mg/L, water sample volume of 200ml, sodium hypochlorite content of 2.19ml, chlorine content of 0.7mg/L for 30 minutes of contact...... After repeated tests, Zhou Xiaoqing, a player from Lishui District Tap Water Co., Ltd. calculated that the chlorine requirement of 200ml water was 0.83mg/L. Start the analog adding devices successively for adding, inspecting, adjusting, and detecting...... Zhou Xiaoqing carefully recorded the residual chlorine value of effluent for 6 times. The whole process took exactly 150 minutes.

"This competition focuses on the evaluation of the theoretical knowledge and skill operation of drinking water treatment, covering the theoretical basis of the occupational skill standard of tap water production workers and the content of skill operation such as adding alum amount test, daily inspection of in-depth treatment, correct adding of disinfectant, etc. 25 players all need to carry out practical operation of 3 items, and the final ranking is determined by stacking the theoretical results." City for water - saving guidance center deputy director Wu Xinghui introduced.

The process of coagulation, precipitation, filtration and disinfection from raw water to tap water has been automated, but the automated data needs to be monitored closely by human hands. "If there is an anomaly, they need to correct it immediately." Zu Zhenquan said, "The overall quality of the tap water production team, determines the stable production and supply of high-quality tap water. At present, the city's main public water supply enterprise water plant has basically completed the in-depth treatment process transformation, water quality assurance ability further improved, training more excellent 'water artisans' will lay a solid foundation for providing more high-quality tap water."

Article source: Nanjing Daily