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With China's rapid economic development, China's rural sewage treatment problem has become one of the government and the public is most concerned about environmental issues. This issue through the biological filter the phosphorus removal fillers screening and treatment of rural sewage to Biofilter the rural sewage actual engineering applications to provide reference. Static adsorption, 30 ℃ oscillation 60 h, 7 mg · L-1 200 mL simulated wastewater dosing 3g plus gas particles or 7g slag in the phosphorus content of the volume of effluent containing phosphorus can be reduced to 1 mg · L -1 or less. Under alkaline conditions, the adsorption performance of the filler is preferred. The initial concentration of phosphorus can increase the amount of filler adsorption of phosphorus. Aerated particles adsorption isotherm equation and Freundlich model fits well with the Langmuir adsorption model fit is poor; slag and shale adsorption isotherm equation with both good fit. Under the conditions of different hydraulic retention time, pH, initial concentration of phosphorus, pure steel slag as a filler removal of phosphorus; combination of fillers, steel slag processing gas particle combination filler phosphorus removal works best , not very different from the rest of the combined packing removal of phosphorus, taking into account the principle of cost-effective, in building a biological filter, you can use the slag aerated particles and shale combination of fillers, slag, aerated particles and shale the volume ratio of 1:1:1. In the entire biofilter start running stage, the removal rate of total phosphorus (TP) basically maintained at about 86%. In the stable operation of the chemical oxygen demand (CODCr), ammonia (NH3-N), total nitrogen (TN) removal of the effect is very good, intermediate water the CODCr, NH3-N, TN value of 15.34 mg · L -1,0.63 mg · L-1, 1.32 mg · L-1 about the removal rate were 93.53%, 94.43%, 91.44%; final effluent the CODCr, NH3-N, TN value of 11.24mg · L- 1,0.32 mg · L-1, 1.14 mg · L-1 about the removal rate were 95.26%, 97.13%, and 92.62%, respectively. Biofilter the analog rural sewage running well engineering actual operating conditions, the actual project DO = 0.5 mg L-1, the removal rate of CODCr, NH3-N, TN and TP were 88.46%, 75.91 %, 76.94% and 85.47%; HRT = 12h, CODCr, NH3-N, TN and TP removal rates were as high as 93.13%, 94.30%, 81.45% and 82.77%; C: N> 10:1 CODCr, NH3 -N, TN and TP removal rates were as high as 88.46%, 87.88%, 92.55% and 86.57%, respectively.
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