CEPT-曝气生物滤池低温下处理模拟灰水的应用研究

Study on CEPT-biological aerated filter treating greywater at low temperatures

实验研究了在冬季低温条件（2～10℃）下，化学温凝预处理-曝气生物滤池（CEPT／BAF）工艺处理模拟灰水的效果。考查了混凝预处理效果、BAF的出水水质与滤料高度的关系、水力负荷对出水COD的影响、直链烷烃苯磺酸钠（LAS）对出水NH3-N等的影响。研究表明：经过预处理（PAC为40mg／L）后的模拟灰水，BAF的有机负荷去除率达到40％～55％；COD、LAS的去除主要发生在滤料前端1．2m处，去除率达到70％，去除率与滤料高度近似呈指数关系下降；在COD负荷、水力负荷不变的情况下，当进水LAS从23mg／L降到9mg／L时，BAF的NH3-N的去除率则从41％上升到72％，说明较高浓度的LAS对亚硝化及硝化细菌有一定影响。模拟灰水经过化学混凝／曝气生物滤池处理之后，出水水质NH3-N、COD和LAS分别在10、40和4mg／L以下。

The treatment of artificial greywater at low temperatures from 10 to 2℃ with the processes of coagulant pretreatment and biological aerated filter were studied. The relation between effluent concentration and the height of filter, the effect of hydraulic loadings on COD, and influence of LAS on NH3-N were discussed. The results showed that COD and LAS were removed more than 70% in the first section of 1.2 meters, which can be regressed by exponential equation. NH3-N removal efficiency was influenced by LAS. The removal efficiency of NH3-N was increased from 41% to 72% when the concentration of LAS dropped from 23 mg/L to 9 mg/L, which indicated that LAS had a negative effect on the nitrobacteria＇ s growth. The concentrations of NH3-N, COD and LAS in effluent from CEPT-BAF dropped to 10,40 and 4 mg/L or below, respectively.