(545aj) Development and Mechanism Study of a Cost Effective Piggery Wastewater Treatment System

This study investigates an innovative cost-effective ABR-CRI system for piggery wastewater (PW) treatment. Combined the strength of ABR and CRI, this system uses ABR as the front-end treatment process and two tandem CRIs as the back-end treatment technology.

In an ABR, PW chemical oxygen demand (COD) removal was significant after 20 hours but NH₃-N, NO₂^--N and NO₃^--N concentrations were not changed. In a CRI system, COD and NH₃-N removals were significant. While the ABR-CRI system was operated continuously for four weeks, the transformation of nitrogen species was investigated by analyzing the NH₃-N, NO₂^--N and NO₃^--N concentrations, enzyme activity and the distribution of microbial communities in the top, middle and bottom sections of the CRI system. The effluent COD and NH₃-N concentrations reached the discharge standards.

The ABR-CRI system was featured by low capital expenditure (CAPEX) and operational expenditure (OPEX), stable operation and strong impact resistance. The ABR-CRI system was shown to be an affordable and practical option for LPW treatment in rural areas.