Characterisation of High Ammonia-nitrogen Wastewater Treat-ment by Encapsulated Immobilised Microorganisms
To address the problem of difficult treatment of high NH4+-N wastewater,this paper used polyvinyl alcohol(PVA)and sodium alginate(SA)as the carrier for the activated sludge and commercially available nitrifying bacterial agent embedded in a reactor to investigate the denitrifi-cation performance of activated sludge,nitrifying bacterial agent,and the hybrid-embedded immobilized carrier on simulated high NH4+-N wastewater,respectively.The results showed that the highest NH4+-N removal rate of 93.92%was achieved under the conditions of 10%pellet dosage,24h reaction time,30℃,DO 3 mg/L,pH 8,and a dose of 3 g of embedded nitrifying bacte-ria.The hybrid embedding had a synergistic effect on TN removal,and the best effect was achieved with 2 g of nitrifying bacteria dosage and 1 g of activated sludge embedding,with a total nitrogen removal of 90.68%,and a COD removal of 72.3%after extending the reaction time to 48 h.The mixed system had a synergistic effect on high NH4+-N removal,with a total NH4+-N removal of 90.68%.The mixed system has good removal ability and stability for high NH4+-N wastewater,and has good application prospects.
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