LI Chang-geng,LIU Cheng,WU Hai-xia,et al.Control Effect of Induced Crystal Softening Technology on Drinking Water Scaling Tendency[J].China Water & Wastewater,2021,37(13 13):54-59.
Control Effect of Induced Crystal Softening Technology on Drinking Water Scaling Tendency
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
13 13
Page:
54-59
Column:
Date of publication:
2021-07-01
- Keywords:
- chemical stability of water quality; induced crystal softening technology; scaling tendency; hardness
- Abstract:
- Water quality stability is an important factor affecting drinking water pipeline transportation and daily use. Due to the high total hardness and total alkalinity, raw water of some water treatment plants has obvious scaling tendency, which needs to be treated. Therefore, control effect of induced crystal softening technology on raw water scaling tendency in LC water treatment plant was investigated, and the mechanism was analyzed. The raw water scaling tendency in the water treatment plant was serious and had a tendency of aggravation. The scaling component was mainly CaCO3 with a small amount of silicon, magnesium and other components. The induced crystal softening technology could effectively reduce the scaling tendency. When the softening agent dosage was 10 mg/L, the scaling tendency of raw water was basically eliminated, and there was no obvious scaling phenomenon during pipeline transportation. Ion composition in the water showed that the decrease of scaling tendency was mainly due to the obvious reduction of calcium ion and bicarbonate ion content and the occurrence of calcium carbonate crystal precipitation was significantly reduced. The continuous operation results showed that the treatment performance of the device was stable and the product water quality could be improved to a certain extent. Direct operational cost (including power and reagent costs) was about 0.05 yuan/m3. In conclusion, induced crystallization softening technology can be used as one of the alternative technologies to control drinking water scaling tendency.
Last Update:
2021-07-01