Author: Tuba EĞTURUL, Ali BERKTAY, Bilgehan NAS
Publishing Date: 2006
Volume 21 Issue 1_2
In this study, effects of salt (NaCl) and toxic (Cr6+) shock loading on the biological wastewater treatment efficiency were determined by using laboratory scale SBR. For this aim, 2 parallel Sequencing Batch Reactors were used, one was the control and the other was shock loaded reactor. 20 g/L NaCl, 5 mg/L Cr6+ and 10 mg/L Cr6+ shock loadings were applied to one of the reactors. COD, MLSS, SVI, salt (NaCl) ve Cr6+were analyzed daily. In salt shock loading, COD removal efficiency decreased but system returned to steady state conditions within 3 days. Similarly COD removal efficiency decreased and system recovered itself in 3 days in 5 mg/L Cr6+ shock loading, but it took much time to return steady state conditions in 10 mg/L Cr6+ shock loading. In 10 mg/L Cr6+ shock loading, COD removal efficiency decreased and system recovered itself in 5 days. In both shock loadings there were no pronounced differences on MLSS and SVI profiles
Key Words: Wastewater treatment; shock loading; salt (NaCl); toxic (Cr6+); SBR.