沸石曝气生物滤池预处理微污染水源水中氨氮的研究

利用沸石曝气生物滤池预处理微污染水源水中的氨氮,研究了沸石的静态吸附性能以及不同运行参数对处理效果的影响.结果表明:(1)沸石具有快速吸附,缓慢平衡的特点.采用氨氮质量浓度为5.00 mg/L的使用溶液进行静态吸附实验,当吸附时间为30 min时,氨氮质量浓度为0.66 mg/L,去除率为86.8%,之后氨氮浓度和去除率基本保持不变.(2)水力负荷对氨氮的去除率影响不大,随着水力负荷的升高,氨氮去除率总体呈小幅度下降趋势.当水力负荷由0.4 m~3/(m~2·h)提高到1.3m~3/(m~2·h)时,氨氮平均去除率降低了13.2%.(3)在实验范围内,随着气水比的增大,氨氮平均去除率略有上升.当气水比为0.5(体积比,下同)、1.0、1.5时,氨氮平均去除率分别为81.8%、85.3%、86.7%.(4)氨氮去除主要发生在填料层200～600 mm处,600mm处的氨氮去除率已经达到89.7%,占总去除率的96.9%,而600 mm处后的氨氮浓度趋于平缓,去除率变化很小.

Pretreatment of ammonia nitrogen in micro-polluted source water by zeolite biological aeration filter

Zeolite biological aeration filter was employed for the pretreatment of ammonia nitrogen micro-pollu-ted source water. The adsorption characteristic and effect of operation parameters on adsorption efficiency were inves-tigated. The static absorption process presented the character of quick adsorption and slow balance,after 30 min of ab-sorption, 86.8 % of ammonia nitrogen was removed from micro-polluted source water (ammonia nitrogen concentration of 5.00 mg/L),then the change tended to stability. When hydraulic loading ranged from 0. 4 m~3/(m~2·h) to 1.3 m~3/(m~2 ·h),the removal rate of ammonia nitrogen had a little change. Ammonia nitrogen removal rate was increased with increasing of gas-water ratio,when the gas-water ratio were 0.5,1.0 and 1.5, the removal rate of ammonia nitro-gen were 81.8% ,85.3% ,86.7% respectively. The optimum layer was from 200 mm to 600 ram,89.7% of ammonia nitrogen was removed at the heights of 600 ram.