3.5. Post-treatment
In order to meet the national discharge standard (COD of 100 mg/L), activated sludge treatment as proper post-treatment was adopted after PSB degradation. After treated by Z08 for 72 h, activated sludge treatment was used and the COD decreased to 70 mg/L after 17.5 h. The total COD removal reached 99.4% in 90 h. The process was simple and effective and the total treatment time was comparable with conventional treatment methods.