改性粉煤灰和高铁酸钾联合处理矿井水的研究

Study on mining water treatment process by modified fly ash and K_2FeO_4

利用高铁酸钾处理经过改性粉煤灰混凝后的矿井水,形成改性粉煤灰和高铁酸钾联合处理矿井水工艺。研究表明,粉煤灰在使用硫酸改性前后,在投加量为50 g/L,对去除矿井水中浊度的变化是53.18～25.42 NTU,对COD_(Mn)的去除效率也由29%升高到50%;在改性粉煤灰中混入高铁酸钾5 mg/L时,矿井水中浊度和悬浮物分别降到18.3 NTU和10 mg/L,COD_(Mn)去除率为53.23%;此后,上清液中投加高铁酸钾10 mg/L时,水中的浊度由18.3 NTU降到5.1 NTU,悬浮物由10 mg/L降到3 mg/L,COD_(Mn)的总去除率也增加到68.88%。在使用该工艺进行小试时,改性粉煤灰用量为50 g/L,并在其中掺杂高铁酸钾5 mg/L,上清液再用10 mg/L的高铁酸钾处理后,出水水质都优于地表水环境质量Ⅳ级标准。

In this paper, a mining water treatment process was proposed by using modified fly ash as coagulant and postteated by potassium ferrate （K2FeO4） oxidation. The results showed that the residual turbidity of treated water was decreased from 53. 18 to 25.42 NTU at the dosage of 50 g/L after fly ash was modified by H2SO4 , while the CODMn removal efficiency increased from 29% to 50%. When modified fly ash mixed with potassium ferrate were used to treat mining water at the dosage of 50 g/L and 5 mg/L respectively, the residual turbidity and suspended matters were decreased to 18.3 NTU and 10 mg/L respectively, and the CODMn removal efficiency increased to 53.23%. Thereafter, when 10 mg/L of potassium ferrate was added in the supernatant, the turbidity and suspended matter were decreased to 18.3 -5.1 NTU and 10 -3 mg/L respectively, and the total removal efficiency of CODMn increased to 68.88%. The pilot study shows that the effluent water quality is better than environmental quality standards for surface water （ IV ）.