| A process integrating ozone/ceramic membrane ultrafiltration and biological activated carbon were used to treat municipal and industrial micro-polluted raw water.The test water were taken from the raw water of Nanlong drinking water plant in Zhongshan and the effluent coming from the Baoshan wastewater treatment in Hebi.The effect of different operation conditions on the effluent quality and membrane filtration characteristics were tested.The membrane used in the experiment is flat-sheet membrane,and the material is Al2O3.The membrane has a pore size of 0.1 ?m,and the overall dimension is 280×1046×12 mm.The pilot study used a process integrating aeration/ceramic membrane ultrafiltration and biological activated carbon,to treat raw water of a drinking water plant.It turned out that the ceramic membrane had a great removal effect of granular pollutants.The turbidity and the particles larger than 2 ?m in effluent was below 0.1 NTU and less than 50 CNT/ml respectively,and iron ion removal by membrane was over 90%?Meanwhile,the removal effect of soluble pollutants by biological activated carbon was remarkable.The removal efficiency of pollutants by the integrated process was increased in different aeration conditions?air,oxygen and ozone aeration?.The removal efficiency of ammonia nitrogen was 25%55% in air aeration condition and both over 95% in oxygen and ozone aeration conditions,meanwhile the removal efficiency of CODMn was 48%72%,58%88% and 70%86% respectively.The removal of iron ion,manganese ion and disinfection by-product precursors basically met the law.It proved that the ozone basically have been decomposed before entering the activated carbon filter,and would have no effect on the microbial growth in the filter.The control of membrane fouling in oxygen and ozone aeration conditions was far better than air aeration.In air,oxygen and ozone aeration conditions,while all the membrane flux were 100 LMH,the TMP was increased by 5.29 kPa,1.29 kPa and 0.97 kPa respectively.The pilot study used different reagents to test their cleaning effect to ceramic membrane.The results showed that the water back-flushing can remove reversible membrane fouling,and chemical cleaning can eliminate irreversible membrane fouling.The cleaning effect of pickling for membrane fouling caused by inorganic matter is good,while the oxidant is very effective to eliminate the organic pollutants.In practice,oxidant need to be used first to clean the ceramic membrane,than uses acid pickling.The pilot study used a process integrating ozone/ceramic membrane ultrafiltration and biological activated carbon,for advanced treatment of the effluent coming from the wastewater treatment plant.The results showed that,of all the process conditions we tested,an operation flux of 80 LMH,water backwashing 40 s for filtrating every 10 minutes,and ozone dosage of 10 mg/L produced the slowest growth of transmembrane pressure,which is only 6 kPa for a period of 24 h.The process effluent had a CODCr concentration and ammonia concentration below 20 mg/L and 0.2 mg/L respectively,corresponding to a removal rate of 50%80% and above 80% respectively,which essentially meeting the quality requirements for reclaimed water.The water chromaticity of the process effluent had been removed basic completely.The BDOC concentration of the process effluent was as low as 0.65 mg/L,which translates into a removal rate up to 91.8%,therefore having effectively improved the reclaimed water in its biological stability.The operational costs of the process integrating ozone/ceramic membrane ultrafiltration and biological activated carbon when treating municipal and industrial micro-polluted raw water are 0.618 yuan/m3 and 0.511 yuan/m3 respectively.It showed a good economic adaptability. |
PDF Full Text Request