锰砂生物过滤在钢铁废水回用中的工艺参数研究

Parameters of manganese sand biological filtration process in recycling of wastewater from steel and iron production

试验研究了锰砂生物过滤工艺在钢铁废水回用处理中的工艺参数。试验采用粒径为0.6～1.2 mm的巩义锰砂,锰砂滤层厚度100 cm。生物膜培养成熟后,滤柱出水总铁和锰的质量浓度分别达到0.3和0.1 mg/L以下。通过不同滤速下处理效果的对比,建议滤速为5 m/h以下,工作周期为4 d,反冲洗强度为27 L/(s.m2),冲洗历时5 min。溶解氧的质量浓度维持在4～5 mg/L可满足生物氧化需氧要求。

The parameters of manganese sand biological filtration process in recycling of wastewater from steel and iron production was studied through the test. The grain diameter of the test used Gong Yi manganese sand was 0.6 - 1.2 mm and the thickness of the filter layer was 100 cm. After the biofilm was trained to be mature, the mass concentration of the total iron and manganese of the effluent water from the filtration column was below 0.3 mg/L and 0.1 mg/L respectively. Through the comparison of the treatment effects of the wastewater under different filtration velocity, the proper process condition was proposed that： the filtration velocity was lower than 5 m/h, the working period was 4 d, the backwash intensity was 27 L/（s·m^2） and the duration time was 5 min. 4 - 5 mg/L of DO concentration could satify the oxygen requirement of biological oxidation.