Granulation of susceptible sludge under carbon deficient conditions: A case of denitrifying sulfur conversion-associated EBPR process.

摘要: Sludge granulation has been recognized as a promising biotechnology in wastewater treatment. Whereas the of susceptible sludge particular with very low organic loading rate (OLR) (≤0.6 kg COD/m(3)/day or ≤ 120 mg COD/g VSS/day) is difficult task that not achieved activated systems yet. This study was aimed at exploring an effective strategy for recently developed Denitrifying Sulfur conversion-associated Enhanced Biological Phosphorus Removal (DS-EBPR) process using sequencing batch pump-lift reactor. Four strategies were studied by manipulating factors (OLR), superficial upflow velocity and settling time individually or collectively. Increasing both OLR effectively promoted granule formation but same led to unstable even deteriorated reactor performance. The development granules proceeded via several stages: formation, dispersion, reformation stabilization. Gradually increasing from 5.1 6.8 m/h keeping 112.4 mg VSS/day proved be most accelerating while simultaneously achieving stable Under these conditions, became diameter 375-400 μm displayed excellent settleability. two major microbial groups, sulfate-reducing bacteria sulfide-oxidizing bacteria, community DS-EBPR granular enriched 17.7% 15.8% respectively. newly system able achieve almost threefold improvement phosphorus removal efficiency 25% reduction operating cycle compared flocculent system.