聚硅氯化铝镁混凝剂处理染料废水的研究

Study on preparation and properties of polysilicate aluminum magnesium chloride

以聚硅酸(Psi)、聚合氯化铝(PAC)和硫酸镁(MgSO_4)为原料,复合制得一种新的无机高分子混凝剂——聚硅氯化铝镁(PMCSM)。研究了PMCSM对模拟染料废水甲基橙溶液的混凝性能,影响因素分为废水浓度、pH值、混凝剂用量、温度、水力条件等。由单因素实验结果可得,最佳条件分别为:废水浓度为35 mg/L,pH值为9,混凝剂用量为80 mg/L,混合阶段搅拌速度为150 r/min,混合时间为2. 5 min,反应阶段搅拌速度为100 r/min,反应时间为25 min。基于单因素研究的结果,进行四因素三水平的正交实验,结果表明PMCSM混凝剂最佳混凝性能的组合条件为:废水浓度为35 mg/L,pH值为9,混凝剂用量为80 mg/L,反应阶段搅拌速度为120 r/min;各因素的影响顺序为:pH值>废水浓度>反应阶段搅拌速度>混凝剂用量。

Polysilicate aluminum magnesium chloride （PMCSM） which is a new inorganic polymer coagulant was prepared from poly silicate （Psi）, polyaluminium chloride （PAC） and Magnesium Sulfate （MgSO4） by combination. The properties of PMCSM coagulation to simulant methyl orange dye wastewater was investigated. There were internal and external influencing factors, including wastewater concentration, pH value, dosage of the coagulant, temperature, hydraulic conditions. The results of single factor research showed the best condition of every factor： the concentration of wastewater was 35 mg/L, the pH value was 9, dosage of the coagulant was 80 mg/L, the mixing speed was 150 r/min, the mixing time was 2.5 min, the reacting speed was 100 r/min, the reacting time was 25 min. On the foundation of single factor research, the L 9 （3 4 ） orthogonal experiment was carried on. The results showed the best condition of the optimal PMCSM coagulation performance as follows： the concentration of wastewater was 35 mg/L, the pH value was 9, the dosage of the coagulant was 80 mg/L and the reacting speed was 120 r/min. The influencing order was respectively the pH value, the concentration of wastewater, the reacting speed and dosage of the coagulant.