Effects of Salt (NaCl) and Toxic (Cr6+) Shock Loadings on Oxygen Utilization and Carbon Removal in Sequencing Batch Reactor (SBR)



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


Wastewater treatment; shock loading; salt (NaCl); toxic (Cr6+); SBR.

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