Study on the granular size and treatment performance of microalgae-bacterial granular sludge
As an emerging photo-driven wastewater treatment process,microalgae-bacterial granular sludge(MBGS)has been widely studied for its efficient pollutant removal,low energy consumption,and zero greenhouse gas emission.Granular size could affect the algal-bacterial mass ratio and ecological niche of MBGS,which in turn affects its mass transfer and light utilization efficacy,and consequently its pollutant removal efficacy.In view of this,the pollutant removal efficiency of MBGS with different granular sizes(1.08,2.20,3.17 and 4.08 mm)were investigated,and it was found that the MBGS system at 1.08 mm showed the most effective removal of organics,ammonia-nitrogen and phosphate,as well as the highest effluent dissolved oxygen concentration.Further literature research and analyses show that the optimal MBGS granular size range should be 0.80～1.60 mm when the light intensity is 100～500 μmol·m-2·s-1;the MBGS granular size has a greater effect on the removal of organics and ammonia-nitrogen compared to phosphate;and the optimal range of granular size of MBGS can be maintained through the supply of shear force(e.g.,hydraulic or mechanical stirring).The results provide a theoretical basis for the application of the MBGS process for real wastewater treatment.
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