Autotrophic Denitrification and Phosphorus Removal Perform-ance of Pyrite/Siderite Composite Mineral Sources
In view of the high nitrate nitrogen and phosphorus concentrations and low Carbon-Nitrogen(C/N)ratio in the biochemical wastewater from a municipal sewage plant,this study proposed an autotrophic deni-trification process by coupling the autotrophic denitrification of pyrite with the autotrophic denitrification of siderite.Batch experiments were carried out to evaluate the nitrogen and phosphorus removal performance of the autotrophic denitrification system with pyrite/siderite composite mineral sources under different Hydrau-lic Retention Time(HRT)and C/N ratios.The results showed that the composite mineral sources had strong capacity of simultaneously removing nitrogen and phosphorus.Specifically,the average Nitrate nitro-gen(NO3-N)removal rate increased from 47.82％to 98.2％when the C/N ratio increased from 0.8-1.2 to 4.8-5.2,and the removal rates of NO3--N reached 87.8％and 96.3％,respectively,at the HRT of 6 h and 8 h.The total phosphorus in the effluent of the system was less than 0.3 mg/L,which met the Class Ⅳstandard of Environmental Quality Standards for Surface Water(GB 3838-2002).Moreover,the composite mineral sources demonstrated the function of stabilizing pH value,maintaining the effluent at pH 7-8.Mi-crobial community analysis showed that the dominant bacteria in the reactor were Thiobacillus,Longilinea,Sulfurimonas,Terrimonas and Thermomonas,with the relative abundance of 20.88％,4.11％,4.76％,3.44％and 2.24％,respectively.Pyrite/siderite as composite mineral sources can achieve deep treatment of nitrogen and phosphorus in biochemical wastewater.
pyritesideriteHydraulic Retention Time(HRT)Carbon-Nitrogen(C/N)rationitrogen and phosphorus removal
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