Parameters Optimization for Natural Zeolite as Composite Filler to Remove Nitrogenfrom Wastewater
Natural zeolite-based composite filler(NZCF)was prepared by combining natural zeolite,cement,and iron powder as primary materials.The preparation parameters were systematically optimized based on three-factor and three-level orthogonal experiment,resulting in the development of NZCF characterized by a notably high specific surface area,mechanical strength,pore volume,and porosity.Saturation adsorption experiments indicated the excellent performance of NZCF in adsorbing ammonium nitrogen,thus demonstrating its significant potential as support with high microbial load and adsorbent for ammonium nitrogen.Biological experiments demonstrated the excellent performance of NZCF in nitrogen removal,with the removal rates of ammonia nitrogen were stabilized at 98％after the enrichment of nitrifying bacteria.Scanning Electron Microscope(SEM)images revealed that the presence of small pores in NZCF increased the specific surface area and enhanced the microbial biomass attachment to the filler.The removal performance of nitrogen over NZCF was tested by simulating the treatment of ammonia nitrogen wastewater using three-stage sequencing batch aeration bio-filter.The results showed that NZCF exhibited notable removal efficiency and stability for ammonia nitrogen at different hydraulic residence times(HRT).The optimal removal efficiency of NZCF for ammonia nitrogen,ranging from 84.3％to 90.3％,was achieved at the HRT of 3.2 h during the ion exchange adsorption stage.This result indicated the impressive application potential of NZCF for nitrogen removal processes from wastewater.
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