摘要
针对南水北调中线原水水质特点,采用溶气气浮+臭氧氧化+炭砂过滤组合工艺对其进行中试研究。通过对工艺参数的优化,混凝剂采用三氯化铁和聚合氯化铝,其中三氯化铁最佳投加量为15 mg/L,聚合氯化铝最佳投加量为30 mg/L。气浮单元最佳溶气压力为0.45 MPa,最优回流比为10%,臭氧最佳投加量为1.5 mg/L,炭砂滤柱的最佳滤速为8 m/h。在浊度为1.21~1.42 NTU、CODMn为2.3~2.8 mg/L、藻类计数为1192×10^(4)~1256×10^(4)个/L的原水水质条件下,出水浊度<0.15 NTU,浊度去除率为90%~93%,CODMn去除率为40%~50%,藻类去除率为93%~95%。可见,该工艺对浊度、藻类和有机物的去除率较高,南水北调中线原水适合采用该工艺进行处理。
According to the quality characteristics of raw water from the middle route of South-to-North Water Diversion Project,a pilot study of the combined process consisting of dissolved air floatation,ozonation and carbon sand filtration for purifying the raw water was carried out.Ferric chloride and polyaluminium chloride were selected as coagulants through the optimization of process parameters,and the optimum dosages of ferric chloride and polyaluminium chloride were 15 mg/L and 30 mg/L,respectively.The optimum dissolved gas pressure of the air flotation unit was 0.45 MPa,and the optimum reflux ratio was 10%.The optimum dosage of ozone was 1.5 mg/L,and the filtration velocity suitable for carbon sand filtration was 8 m/h.When the raw water quality was as follows:turbidity of 1.21-1.42 NTU,CODMn of 2.3-2.8 mg/L and algae count of 11.92 million cells/L to 12.56 million cells/L,the turbidity of effluent was less than 0.15 NTU and the removal efficiencies of turbidity,CODMn and algae count were 90%-93%,40%-50%and 93%-95%,respectively.Therefore,the process had high removal efficiencies of turbidity,algae and organic matter,suggesting that it was suitable to treat raw water from the middle route of South-to-North Water Diversion Project.
作者
赵新娟
董芸
张耀明
赵亮
蒋建伟
尹硕
刘伯一
ZHAO Xin-juan;DONG Yun;ZHANG Yao-ming;ZHAO Liang;JIANG Jian-wei;YIN Shuo;LIU Bo-yi(Tianjin Hua Miao Research&Design Institute of Water&Wastewater Co.Ltd.,Tianjin 300190,China;Tianjin Sino French Jieyuan Water Co.Ltd.,Tianjin 300121,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2022年第17期55-59,共5页
China Water & Wastewater
关键词
短流程水处理工艺
南水北调中线原水
溶气气浮
臭氧氧化
炭砂过滤
short-flow water treatment process
raw water from middle route of South-to-North Water Diversion Project
dissolved air flotation(DAF)
ozonation
carbon sand filtration
