中置曝气生物活性炭工艺中的微絮凝

利用新型炭滤-砂滤工艺对南方湿热地区微污染源水进行中试规模的微絮凝实验研究。结果表明,接触絮凝时间为2~5 min时,投加1.0 mg/L的PAC微絮凝效果最好。运行稳定后,砂滤器出水浊度≤0.1 NTU,对COD Mn的去除效果有一定改善,微型水生生物的种类和数量也较炭滤器有大幅度下降,其中双层砂滤的效果优于单层粗砂,但其水头损失增长较快。通过微絮凝,砂滤器对炭滤器反冲洗后初滤水能有较好处理效果,可有效简化运行工艺。同时可保证滤后水中铝含量满足《生活饮用水卫生标准》的要求。

Micro-flocculation in mid-positioning aerated biological activated carbon process

On the basis of new carbon-sand filtration process,a pilot test of micro-flocculation was conducted for the micro-polluted raw water treatment in south moist heat areas.Results showed that the optimal dosage of PAC is 1.0 mg / L when the coagulation time is between 2 and 5 minutes.After its stable operation,the filter effluent turbidity was reduced to be below 0.1 NTU,the COD Mn removal efficiency was also improved,and both the microorganisms species and quantity in the sand filter effluent significantly decreased.The sand filter packed with dual media was observed to be superior to the one with single coarse media,but its head loss increased more quickly.Through micro-flocculation,the initial filtrated water of carbon filter could be well treated by the sand filter,making the process more simple.Meanwhile,the aluminium content of the finished water can meet the requirement of Hygienic Standard of Drinking Water.