Aerobic granules for organic carbon and nitrogen removal can be successfully developed at different substrate N/COD ratios in sequencing batch reactors. Complete and efficient organics and nitrogen removal can be achieved in single granules-based SBR if the operating conditions could be properly controlled, and the system stability and nitrogen conversion capacity could be maintained in the granules-based SBR.
The phosphorus-accumulating microbial granules can also be developed at different substrate P/COD ratios in SBRs. Results showed that the PAGs had typical phosphorus accumulating characteristics and the P uptake by granules fell into a range of 1.9-9.3% by weight, which is comparable with those obtained in conventional EBPR processes. In summary, the results presented in this chapter open a door for environmental engineers to further develop a novel granules-based biological process for nutrient removal from wastewater.
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