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针对地下水硬度去除问题,在传统石灰软化法基础上,通过静态实验对比研究了沉淀回流过程对石灰软化法处理效果的影响。结果表明:在进水硬度385 mg/L,Ca O投加量200 mg/L条件下,经“沉淀回流-石灰软化”处理后,出水滤后总硬度为140 mg/L,比传统石灰软化法低40 mg/L;出水滤前浊度在20 NTU以下,比传统石灰软化法低100 NTU;石灰有效利用率为88%,比传统石灰软化法高25%。这表明通过沉淀回流有效提高了石灰有效利用率,降低了出水浊度。在Ca O投加量200 mg/L,Fe Cl_3投加量3.6 mg/L条件下,通过“沉淀回流-石灰软化/Fe Cl3混凝”处理12 min,静沉30 min后,出水滤后总硬度可维持在140 mg/L左右,浊度低于1 NTU,达到《生活饮用水卫生标准》(GB 5749-2006),加热煮沸后无沉淀和漂浮物产生。
According to the problem of groundwater hardness removal, the effects of precipitation reflow process on lime softening method were studied by static experiments based on the traditional lime softening method. The results showed that the total hardness after water filtration was 140 mg / L with the infiltration hardness of 385 mg / L and the dosage of 200 mg / L of CaO after treated by “precipitation reflow - lime softening” Lime softening method low 40 mg / L; effluent turbidity below 20 NTU, 100 NTU lower than the traditional lime softening method; effective utilization of lime 88%, 25% higher than the traditional lime softening method. This shows that the effective utilization of lime is effectively improved by the precipitation backflow, and the effluent turbidity is reduced. Under the conditions of 200 mg / L CaO dosage and 3.6 mg / L FeCl 3 dosage, the samples were treated by “precipitation reflux - lime softening / Fe Cl3 coagulation” for 12 min, After the total hardness can be maintained at 140 mg / L or so, less than 1 NTU turbidity, to “drinking water health standards” (GB 5749-2006), no boiling after boiling and floating objects generated.