Carbon and nitrogen removal from low-strength domestic wastewater with a two-stage submerged biological filter.
The aim of the present study was to evaluate the secondary and tertiary treatment of low -strength domestic wastewater with submerged biological filters (BFs). The experiments were carried out with a two-stage pilot plant consisting of two subsequent filter columns. In the first aerated reactor, the removal of carbon and nitrification was accomplished (secondary nitrification); while, in the second anoxic reactor a post-denitrification process with methanol as external carbon source was performed. During the 3 months of experimental period, in average terms, Total Suspended Solids (TSS) concentrations of 156 mg/L were reduced to 5 mg/L; Chemical Oxygen Demand (COD) concentrations of 179 mg/L were reduced to 43 mg/L. In the secondary nitrification, mean influent NH(4)(+) concentrations of 6.1 mg/L were reduced to average values of 1.8 mg/L. During the post-denitrification, mean influent NO(3)(-) concentrations of 12.0 mg/L were reduced to average values of 6.1 mg/L. The overall process produced a backwashing effluent with an average concentration of about 175 mg/L of TSS.
De Feo
Giovanni
G
Department of Civil Engineering, University of Salerno, Fisciano SA, Italy. g.defeo@unisa.it
D019149:Bioreactors; D002244:Carbon / Q000302:isolation & purification*; D005374:Filtration / Q000295:instrumentation* / Q000379:methods; D009566:Nitrates / Q000378:metabolism; D009584:Nitrogen / Q000302:isolation & purification*; D010100:Oxygen / Q000378:metabolism; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
D009566:Nitrates; D014874:Water Pollutants, Chemical; D002244:Carbon; D009584:Nitrogen; D010100:Oxygen