Abstract
To develop a quick, efficient, economical and easy method of obtaining a carbon source for piggery wastewater, thermo-alkaline treatment of pig manure hydrolysate as an external carbon source (PMC), which contains a high concentration of VFAs, was used. Batch experiments were carried out to determine the effect of the COD/TN ratio on piggery wastewater denitrification using PMC, and a comparison was made between PMC and sodium acetate for the denitrification at the optimum COD/TN ratio. Then, the effect of PMC on piggery wastewater denitrification was proven in a sequencing batch reactor. The results show that when PMC is applied, the appropriate C/N ratio for denitrification is 6.5, which is equivalent to an addition of 3.8%. Under these conditions, PMC performed better than sodium acetate. With PMC, the contents of NO2-N and NO3-N in the SBR under three different HRTs were less than 0.02 mg/L and 5 mg/L, respectively, and the TN removal rate was 90%. The highest denitrification rate of SBR was 25.37 mg NO3-N/(g VSS h).
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