Application research of PVDF membrane contactor in the treatment of ammonia-containing wastewater in power plants
The ammonia-containing wastewater from coal-fired power plants has the characteristics of large water volume,high ammonia-nitrogen concentration,and large water quality fluctuations,making conventional ammonia removal processes difficult to treat.In this paper,PVDF membrane contactor was used to treat high-concentration ammonia-containing wastewater from coal-fired power plants.The effects of membrane contactor type,water flow,gas vacuum,gas-liquid contact area and influent water quality on nitrogen removal efficiency were investigated.The results show that the gas-liquid separation process based on PVDF membrane contactors can reduce the concentration of ammonia nitrogen in high-concentration ammonia containing wastewater from 1 250 mg/L to below 300 mg/L.Both external and internal pressure membrane contactors have ideal application effects;The mass transfer efficiency of NH3 can be effectively improved by increasing the flow rate of water side and the vacuum degree of air side;Increasing the mass transfer membrane area can significantly improve the removal rate of ammonia nitrogen in circulating liquid.Multiple resource utilization pathways for separating NH3 in coal-fired power plants have been proposed,which provides reference for the engineering application of membrane contactors.
membrane contactorammonia-containing wastewatercoal fired power plantsdenitrification fluxpolyvinylidene fluoride
NETL
NSTL
万方数据
维普
