Effects of Cr³⁺ on COD Changes of SBR Activated Sludge System with Different Chromium Loads and Different Initial SVIs

Abstract:

Aiming at the toxic effect of Cr³⁺ on the activated sludge in sequencing batch reactor (SBR) process system, the article researched the toxic effect of Cr³⁺ on activated sludge and sewage processing in SBR process system through detecting the COD changes of SBR activated sludge with different chromium loads and different initial SVIs. The results show that when chromium load level is lower than 12.5mgCr³⁺/g mlvss, Cr³⁺ can promote activated sludge to adsorb organic substance COD. The effect is affected by the initial SVI which exerts impact on the toxic effect of chromium load on activated sludge within the tolerance range. When it is within the non-tolerance range, the final effluent COD of the system increase apparently. In the process, COD change curve is rather gentle; and the time of arriving at a rather low COD is relatively delayed. The system tolerance of chrome toxicity with a low initial SVI is comparatively strong.

• Periodical: Applied Mechanics and Materials (Volumes 448-453)
• Pages: 438-443
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.448-453.438
• Online since: October 2013
• Authors: Guo Ri Dong*, Jian She Liu
• Keywords: Chromium, Chromium Load, Initial SVI, Non-Tolerance Range, SBR, Tolerance Range

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