反渗透膜清洗药剂的复配及其应用OA

With sodium gluconate and polyaspartic acid(PASP)as chelating agents,a compound cleaning agent was developed for reverse osmosis(RO)membrane.The effect of cleaning agent composition on the activity of membrane cleaning was investigated to select the optimal formulation.The changes in the surface performance of the RO membrane before and after cleaning were characterized by technologies including FTIR,SEM,and AFM.The influence of cleaning temperature and immersion time on the cleaning effect was discussed.According to the experiment results,the formulation of the compound cleaning agent is optimal with 0.9%(w)sodium gluconate,1.2%(w)PASP,5.0%(w)surfactant(the mass ration of alkyl polyglucoside and modified polyether L-61 is 3∶1),2.0%(w)anti-deposition agent(the mass ratio of polyacrylic acid and polymaleic anhydride is 3∶1),and the rest is deionized water.After cleaning,the arithmetic mean roughness of the RO membrane surface is 29.6 nm,which is close to the new membrane(28.5 nm).With the cleaning temperature of 30℃and 8 h immersion,the RO membrane flux after cleaning achieve the recovery rate of 96.0%.After 10 cleaning cycles,the RO membrane flux recovery rate can be 91.0%.With a mild formulation,this compound cleaning agent is phosphorus-free,environment-friendly,and biodegradable,offering strong support for the green operation and maintenance of industrial RO systems.