低温下生物陶粒反应器去除水源水中氨氮的研究

Studies on the removal of NH_4^+-N in raw water with bio-ceramic reactor under the condition of low temperature.

利用生物陶粒预处理工艺,研究低水温条件下生物陶粒反应器对氨氮的去除效果.进水氨氮浓度为0.5~1.4mg/L,水力停留时间为20~30min.结果表明,低温条件下,生物陶粒反应器对进水中氨氮的去除效果随着水温的下降而降低,但总体上对氨氮仍然有较好的去除效果.当水温从10℃下降到0.4℃时,生物陶粒反应器对氨氮的去除率从90%下降到65%.当水温在3℃以上时,出水中NO2--N低于进水NO2--N的含量.当水温下降到3℃以下后,出水中NO2--N超过了进水中NO2--N的含量.在陶粒反应器内部出现了NO2--N积累现象,水温越低,出水NO2--N的含量越高.

Utilizing the research technology of bio-ceramic pretreatments the NH4+-N removal effect of bioceranuic reactor under the condition of low water temperature was studied with NH4+-N concentration in the raw water of 0.5~1.4mg/L, and the HRT of raw water of 20~30min. The NH4+-N removal effect of the reactor decreased with lowering of water temperature; but speaking all-sidedly, the effect was stile good relatively. The removal effect of NH4+-N decreased from 90% to 65% when the water temperature fell from 10℃ to 0.4℃. When the water temperature was above 3℃, concent of NO2--N in the effluent was lower than that in the raw water; after the water temperature was below 3℃, concentration of NO2--N in the effluent was higher than that in the raw water. There appeared the accumulation phenomenon inside the reactor that the lower the water temperature, the higher the content of NO2--N in the effluent.