Polyurethane Foams Biofilm Carrier for Treatment of Wastewater Containing Strong Ammonium
Alkaline treatment was done to treat polyurethane foams using NaOH.The treated carriers were used as microbial membrane carrier in biological aerated filter to deal with high strength ammonia wastewater.The foams were processed via 8wt% NaOH solution for 0.5 h,1 h and 1.5 h respectively.Results showed that the porosity and water holding magnification of polyurethane carrier were increased.The polyurethane achieved the best results after alkaline hydrolysis for 0.5 h,including porosity of 93.4% and water-holding ratio up to 31.4.The polyurethane foam carrier after alkali hydrolysis reaming processing showed good hydrophilic properties,with a high microbial load of 264.35 mg/g.The processed polyurethane foams as microbial immobilization carrier for wastewater treatment present the good pollutant removal efficiency of sewage indicators of COD and NH4+-N.