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为有效去除水中的溶解性硅酸盐,以某溶解性硅酸盐含量高达50~60mg/L的地下水为对象,开展复配混凝剂去除水中溶解性硅酸盐的试验研究.结果表明:当Ca(OH)_2投加量为450 mg/L时,对水中溶解性硅酸盐和浑浊度的去除率分别为51.16%和74.8%;进一步增加Ca(OH)_2投加量可进一步强化溶解性硅酸盐的去除,但会引起出水pH值的大幅升高;FeCl_3对水中溶解性硅酸盐的去除率低于12.55%,但其对出水浑浊度具有明显的控制优势;MgO对水中溶解性硅酸盐的最优投加量为400 mg/L,此时去除率为14.53%,处理后出水浑浊度较高;FeCl_3复配Ca(OH)_2时,对水中溶解性硅酸盐的去除率超过60%,并且出水浑浊度低于0.65 NTU;FeCl_3复配MgO时,对水中溶解性硅酸盐的去除率可达75%以上;Ca(OH)_2复配MgO时,对水中溶解性硅酸盐的去除率最高达73.76%,较单独使用Ca(OH)_2除硅时(81.41%)有所下降.3种复配方案中,以FeCl_3复配MgO的方案为佳,在此方案下,当Fe~(3+)质量浓度为16.8 mg/L、MgO质量浓度为500 mg/L时,硅的去除率达76.67%,滤后浑浊度为0.83 NTU,同时出水pH值最低,可节省后续调整pH时的酸用量.
In order to effectively remove the dissolved silicates in water, aiming at the groundwater with a content of 50 ~ 60mg / L of soluble silicate, the experiment of compound coagulant to remove dissolved silicates was carried out.The results showed that: When the dosage of Ca (OH) 2 was 450 mg / L, the removal rates of dissolved silicate and turbidity in water were 51.16% and 74.8%, respectively. The further increase of Ca (OH) 2 dosage could be further strengthened However, the removal rate of dissolved silicate in water is less than 12.55%, but it has obvious control over the turbidity of effluent. The effect of MgO on the removal of dissolved silicate in water The optimal dosage of soluble silicate is 400 mg / L, the removal rate is 14.53%, the turbidity of effluent is high after FeCl_3 is mixed with Ca (OH) _2, The removal rate of water is more than 60%, and the effluent turbidity is less than 0.65 NTU. When FeCl_3 is mixed with MgO, the removal rate of soluble silicate in water can reach more than 75%. When Ca (OH) _2 is mixed with MgO, The removal rate of silicate is up to 73.76%, which is lower than that of silicon (81.41%) when using Ca (OH) 2 alone. Among the three kinds of compounding schemes, Under this scheme, when the concentration of Fe 3+ is 16.8 mg / L and the concentration of MgO is 500 mg / L, the removal rate of silicon is 76.67% and the turbidity after filtration is 0.83 NTU. Meanwhile, The lowest pH value of the effluent can save the amount of acid used for subsequent pH adjustment.