Demand Analysis and Application of Drinking Water"Scale Control"in Nanjing Area Technical Discussion
Drinking boiled tap water is an important drinking habit among residents in China,but the issue of"scale"generated after boiling poses challenges for both water supply companies and users.This study combined the characteristics of water source,existing treatment processes and the demand for"scale"control in the Nanjing region.By considering the generation reactions and influencing factors of"scale",it explored effective methods for controlling"scale"in low-hardness drinking water.The results indicated that the overall water quality of the Nanjing region was good,and water treatment plants had established advanced treatment processes to ensure the safety of water supply.Currently,the typical water quality issue was related to"scale".The improved induced crystallization softening process had a good control effect on"scale"after boiling.The dosage of softening agent should be controlled at around 10 to 20 mg,and carbon dioxide should be added to adjust the pH.After treatment,there was no"scale"in the boiled water,and the total hardness of the water after boiling remains unchanged.Additionally,"scale"was not generated even after multiple boilings.The total operating cost of the process could be controlled to around 0.06 yuan/m3.
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