XIEYa-wei,FANCheng-yue,ZHANGBen,et al.Comparative Analysis of Two Kinds of Sodium Hypochlorite Generators in Large Drinking Water Treatment Plants[J].China Water & Wastewater,2022,38(15):1-6.
Comparative Analysis of Two Kinds of Sodium Hypochlorite Generators in Large Drinking Water Treatment Plants
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第15期
Page:
1-6
Column:
Date of publication:
2022-08-01
- Keywords:
- sodium hypochlorite generator; active chlorine; chlorate; salt consumption; power consumption; operation cost
- Abstract:
- The sodium hypochlorite disinfection process has been extensively applied in drinking water treatment plants. Three large-scale sodium hypochlorite generators with active chlorine production of 20 kg/h were compared in terms of active chlorine concentration, chlorate, salt consumption, and power consumption. The results showed that the average concentrations of active chlorine produced by three generators ( F1#, F2# and C1# ) were 0.81%, 0.79%, and 0.85%, respectively, which met the design concentration of about 0.8%. The ratios of chlorate to active chlorine in the effluent of the three generators ( F1#, F2# and C1# ) were 4.8%, 4.9% and 1.2%, respectively, meeting the requirements of less than 5.4% specified in Chemicals Used for Treatment of Water Intended for Human Consumption—Sodium Hypochlorite (BS EN 901-2013). The chlorate by-product concentration of C1# was only around 24% of that of F1# and F2#. The power consumption of C1# generator was lower than that of F1# and F2# under summer mode, normal mode, and winter mode. Among them, in winter mode, C1# adopted electrolytic cell heat transfer instead of compressor heating, further reducing the power consumption of the generator. The average operating cost of three generators ( F1#, F2# and C1# ) were 6.8 yuan/kg, 6.7 yuan/kg and 5.6 yuan/kg, and C1# was lower than F1# and F2# resulted from its lowest power consumption. In addition, compared to the 1-year warranty period of the imported sodium hypochlorite generators, the warranty period provided by the domestic generator was 5 years, which was highly competitive.
Last Update:
2022-08-01