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琼海市某中学饮用水中的铁含量在2.20 mg/L左右,超出了国标限值的要求。为降低供水的铁浓度、浊度及微生物含量,采用超滤膜组合工艺进行处理,分别研究了机械鼓风曝气的最佳曝气量和次氯酸钠的最佳投量,以及跌水曝气和鼓风曝气对砂滤+超滤组合工艺除铁效果的影响。结果表明,当控制机械曝气的气水比为5、反应时间为10 min,或次氯酸钠的投加量为1.00mg/L时,超滤膜出水铁含量均能达到0.10 mg/L以下;两种曝气方式对除铁的影响不大;经机械曝气与锰砂过滤联合预处理后,超滤膜的跨膜压差(TMP)增长速度最慢。所以曝气与锰砂过滤联合预处理+超滤膜的组合工艺较优。
The content of iron in drinking water of a middle school in Qionghai City is about 2.20 mg / L, which exceeds the limit of national standard. In order to reduce the iron concentration, turbidity and microbe content of water supply, the ultrafiltration membrane combination process was used to treat the optimal aeration of mechanical aeration and the best dosage of sodium hypochlorite, Effect of Blast Aeration on Iron Removal by Combined Sand and Ultrafiltration Process. The results showed that when the mechanical aeration gas-water ratio is 5, the reaction time is 10 min, or the dosage of sodium hypochlorite is 1.00mg / L, the iron content of the ultrafiltration membrane effluent can reach below 0.10 mg / L; The effect of aeration on iron removal is insignificant. After pretreatment with mechanical aeration and manganese sand filtration, the transmembrane pressure drop (TMP) of ultrafiltration membrane increases slowly. Therefore, aeration and manganese sand filtration combined pretreatment + ultrafiltration membrane combination process is superior.