در تصفيه پساب هاي حاوي فلزات سنگين جيوه و كادميوم (مطالعه ) موردي پتروشيمي بندر امام خميني SBR بررسي عملكرد راكتورهاي ناپيوسته با عمليات متوالي

The Studying of Sequencing Batch Reactor Operation for Removal of Mercury and Cadmium from Wastewater(Case Study: Bandar Imam Petrochemical Complex)

In this study the operation of sequencing batch reactors for treatment of wastewater containing heavy metals compounds (mercury and cadmium). By use of two automatic SBRs, feeding with the synthetic wastewater (that the compounds of it was the same as the coloralkali unit of petrochemical Bandar Imam) was studied. The amount of COD was 100-150 mgll, mercury concentration was 0.1.1,5 and 10 and cadmium concentration was 0.1,2, 10 and 15 mg/I. Return sludge of Ghaytarieh wastewater treatment plant was used for seeding of SBR reactors. Reactors were operated for the period of four months. The obtained results show that: -The acclimation time for microorganism in this system is short (8-9 days) - COD Removal percentage in the SBRs was about 80-85% -MLSS concentration after acclimation time has increasing 20-25% and SVI has decreasing 20% from the start of system running. -Mercury removal percentage at the concentration of 0.1-10 mg/l has been 77.15 and Cadmium removal percentage at the concentration of 0.1-15 has been 88.79.