Research Studies on Removal of Ammonia Nitrogen from Domestic Sewage by Sodium Hypochlorite
The intermittent high concentration wastewater leads to the incomplete nitrification,increasing ammonia-nitrogen content and negative impact on water quality and biological system during the domestic sewage treatment process,which will cause environmental problems.Therefore,it is necessary that the corresponding measures were conducted to control the ammonia-nitrogen content and protect biological wastewater treatment system.The sodium hypochlorite has the advantages of facile operation,rapid response and disinfector of water bodies,which is an effective oxidant to remove ammonia-nitrogen in water bodies.Here,10 mg·L-1 ammonia-nitrogen solution was obtained by the domestic sewage treatment plant.The ammonia-nitrogen was removed by sodium hypochlorite as oxidant.In experiment,the dosage of sodium hypochlorite,reaction time,reaction temperature and reaction pH were investigated by the single variable method to remove ammonia-nitrogen.According to the experimental results,we found that the ammonia-nitrogen removal efficiency reach 100％under m(Cl2):m(N)=9.6:1,20 min,15℃～30℃ and pH=6.5～8.0.Meanwhile,this method will also ensure the appropriate chlorine residual,which promote the domestic sewage discharge with the standards.Consequently,the ammonia-nitrogen removed by sodium hypochlorite is promising for the domestic sewage treatment.
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