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采用混凝-沉淀-SMF和混凝-气浮-SMF对渤海湾海水进行净化处理,考察了2种工艺作为反渗透海水淡化预处理的净化效果及运行稳定性。结果表明,气浮或沉淀后的海水经SMF处理,出水浊度均小于0.3 NTU,颗粒物去除率在98%以上,总铁质量浓度小于0.1 mg/L,SDI_(15)稳定在1左右,COD_(Mn)小于1 mg/L,达到了反渗透膜的进水水质要求;但是混凝-沉淀-SMF的膜比通量衰减速度明显小于混凝-气浮-SMF,且反洗后膜比通量恢复率较高。从出水水质、运行稳定性和经济性上考虑,混凝-沉淀-SMF优于混凝-气浮-SMF。
The seawater from Bohai Bay was treated by coagulation-sedimentation-SMF and coagulation-air-float-MFF, and the purification process and operation stability of two kinds of processes as the reverse osmosis desalination pretreatment were investigated. The results showed that the air flotation or sedimentation of seawater after SMF treatment, the effluent turbidity were less than 0.3 NTU, particulate removal efficiency of more than 98%, total iron concentration of less than 0.1 mg / L, SDI_ (15) stable at about 1, COD_ (Mn) is less than 1 mg / L, which meets the influent water quality requirements of reverse osmosis membranes. However, the membrane flux decay rate of coagulation-precipitation-SMF is obviously less than that of coagulation-air flotation-SMF, Flux recovery rate is higher. From the effluent quality, operational stability and economic considerations, coagulation-precipitation-SMF is better than coagulation-air flotation-SMF.