| Swine wastewater, especially swine wastewater has become a major source of waterpollution in our cities and towns. With the accelerated development of China’s large-scalefarming, the bad environmental pollution is also growing pressure accompanied.Approximately70%of the national swine wastewater is a high COD, low C/Nwastewater. Some domestic large-scale pig farms in the piggery wastewater treatmentprocess often encounter the problem of insufficient carbon. Nitrogen emissions far exceednational industry standards. Therefore, the process wastewater, focusing on how the depthdistribution of nitrogen and carbon. The step-feed biological nutrient removal system ismore widely studied abroad in recent years, In this paper, we use the actual swinewastewater for the study. The results show:（1）Adding10~500mg/L PAC in swine wastewater, TN and NH3-N removalrates are15to30%, with no significant difference between the removal. For swinewastewater effluent with high COD, low C/N, and is not suitable for pretreatment ofcoagulation and sedimentation. Coagulation sedimentation removes about60%of theCOD, but only about20%removal of NH3-N, the treated water C/N is reduced,increasing the difficulty of the subsequent biological treatment.（2）The step-feed biological nutrient removal system on piggery wastewater hasbetter removal. Influent COD=8000mg/L, the effluent COD=400mg/L, COD removalefficiency is above90%; Influent NH3-N=800mg/L, the effluent NH3-N=15mg/L,NO3-N=20mg/L, more than90%nitrogen removal efficiency. Explanation that thestep-feed biological nutrient removal system has the ability to handle farm wastewater.（3）To the step-feed biological nutrient removal system, different C/N ratio has adirect impact on the system of wastewater effluent. When the split ratio of1:1, C/N <5,the effluent NH3-N, NO3-N was significantly higher than before. To the swine water oflow C/N can be achieved by adjusting the split ratio for improving removal rate. |
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