Application of 4 strains aggregation bacteria (Bacillus cereus KG05, Bacillus megaterium VL.01, Bacillus.sp VL05, Bacillus aryabhattai ST02) in treatment process of piggery wastewater after biogas system at the 8 liter scale (in the laboratory), the results showed that aggregation efficiency was 84-86 percent, and TSS and BOD5 reduced 40.5 times and 144.4 times compared with controls, respectively
while total phosphorus concentrations (IF) 2 mg/l, concentration of ammonium (N-NH4+)3 mg/l, orthophosphate levels (P-PO4)0.5 mg/l, and research criteria reached to standard A or B of QCVN40:2011/BTNMT after 2 treatment cycles (31 hours). Pair of Bacillus cereus KG05 and Bacillus megaterium VL01 was selected to apply in piggery wastewater after biogas treatment in the containers: 80 and 800-liter at the pig farm. The results showed that the highest aggregation efficiency was in the second cycle with 90.4 percent (container 80-liter) and 82.6 percent (container 800-liter), and pH, TSS, and TP reached to standard A or B of QCVN40:2011/BTNMT
while concentration of BOD5, TN, N-NH4 P-PO4 decreased over 50 percent compared to the control.