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针对水源频繁切换造成原水水质硫酸根质量浓度突变对给水管网铁释放的影响开展试验研究。选取北京市城区3个不同地区的管段,设计并制作管段模拟反应器,比较分析不同硫酸根质量浓度水质条件下、不同地区管段的铁释放情况。结果表明:硫酸根质量浓度的大幅增加可导致黄水问题。给水管网铁释放量与硫酸根质量浓度具有显著相关性,当硫酸根质量浓度从25mg/L增加到180mg/L,相应的Larson指数从0.35增加到1.40时,8h滞留时间后管段出水浊度、色度的最大增加值分别约为6NTU和50度,总铁释放速率最大增加约2.00mg/(m2.h)。由此,确定了水源切换条件下,硫酸根和Larson指数对管垢铁释放的控制指标:硫酸根质量浓度<75mg/L,Larson指数<0.70。在此条件下,管网水主要水质指标(总铁质量浓度、浊度和色度)基本达标。
Aiming at the influence of abrupt change of water quality on the release of iron in the water supply pipelines, aiming at the frequent switching of water source, the experimental study was carried out. The pipe sections in three different districts of Beijing were selected to design and make pipe-section simulation reactors. The iron releases in different sections of pipelines under different water quality conditions were compared. The results show that the substantial increase of sulfate concentration can lead to yellow water problem. There was a significant correlation between the amount of iron release and the mass concentration of sulfate. When the mass concentration of sulfate increased from 25mg / L to 180mg / L and the corresponding Larson index increased from 0.35 to 1.40, the effluent turbidity , The maximum added value of chroma is about 6NTU and 50 degrees respectively, and the maximum increase of total iron release rate is about 2.00mg / (m2.h). Therefore, the control indexes of sulfate and Larson index on the release of scale and scale iron were determined under water source switching conditions: sulfate concentration <75mg / L, Larson index <0.70. Under this condition, the main water quality indicators of pipe network water (total iron concentration, turbidity and color) basically reached the standard.