Abstract:
Introduction Taking the simulated wastewater of desulfurization and denitrification tailings in thermal power plant as the substrate, the effect of sulfide on shortcut nitrification and denitrifying granular sludge on wastewater treatment and the variation of granular sludge are observed.
Method By changing the oxygen supply conditions of the reactor, the shortcut nitrification process was achieved by using high concentration of salinity and sulfate in the desulfurization and denitrification tail liquid under low oxygen conditions, and the self-supporting denitrification was achieved by using sulfide as an electron donor under anaerobic conditions.
Result During the adaptation stage, the granular sludge is broken, and the degree of granulation slightly decrease. As the experiment progressing, the removal efficiency increase, and granulation of the sludge recover. Under the condition of HRT of 10 h, the total nitrogen removal rate of 90% was stably achieved.
Conclusion It shows that the granular sludge can adapt to the desulfurization and denitrification tail liquid in a short time, and can better cope with the complicated water inlet.
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