Study On The Hybrid Process Of Ultrafiltration For Purification Of Polluted Surface Water

Along with the water pollution of the environment problem increasingly serious, the global water pollution and human safe drinking water crisis is more and more serious. Water pollution affects the safety of drinking water,and water pollution directly endanger human life and health. Water environmental issues have become a common concern in the worldwide development of strategic objectives.The subject first by contrast ultrafiltration and sand filtration treatment process Songhua River water in the sink after water purification performance obtained by ultrafiltration treatment of slightly polluted surface water in addition to pollution characteristics. Compared to sand filtration technology, ultrafiltration efficient removal process on the turbidity of the water, Filtering the precipitated water through sand filtration and ultrafiltration process, the lower degree of organics removal of water.Sand filtration and ultrafiltration water precipitation DOC removal rates were (9.4±2.0)%and (6.4±2.4)%; UV254go average removal rate of (5.2±1.9)%and (3.9±1.6)%, and the average removal rate of CODMn (9.1±5.1)%and (7.2±3.1)%, For a low influent concentration of ammonia and nitrite nitrogen, sand filters effective removal of ammonia and nitrite nitrogen; ultrafiltration influent ammonia and nitrite nitrogen removal efficiency is low.On this basis, constructed through the introduction of biological treatment in the ultrafiltration process, a small pilot scale ultrafiltration membranes-bioreactor, Ultrafiltration-bioreactor natural start-up and stable operation of removal of pollution characteristics. Application of ultrafiltration membranes-the bioreactor start the natural treatment of slightly polluted surface water and stable operation of the process, and will not appear mature and organics removal efficiency sudden increase in a sign of heterotrophic bacteria, The whole operation period, System to DOC, UV254and CODMn respectively the average removal rate is only (14.5±5.1)%and (12.6±5.6)%and (31.2±7.4)%, naturally start23days after the system to obtain a stable higher than80%removal of NH3-N rate; naturally start31days after the system responsible for the oxidation of NO2-N nitrifying bacteria mature, Ultrafiltration Membrane-bioreactor effluent NO2--N stable at0.05mg/L or less, Alkalinity removal of NH3-N in water affect performance of ultrafiltration membranes-bioreactor to influent dosage of30mg/L NaHCO3, ultrafiltration membrane-bioreactor influent NH3-N rose to an average of removal from dosing (86.1±3.7)%,(98.0±1.6)%.Further ultrafiltration membrane-bioreactor organics removal problem of low performance, introduced by activated carbon adsorption to the ultrafiltration membrane-bioreactor in building integrated PAC-MBR explored of Powdered Activated Carbon-bioreactor system in (?) and menioiane louning of unraiiurauon membranes.(?) Powdered Activated Carbon, Ultrafiltration Membrane-bioreactor system average removal rate of DOC, UV254and CODMn respectively (29.1±4.8)%,(32.6±6.4)%and (40.8±4.3)%increase to (53.1±4.6)%,(80.3±3.6)%,(64.3±3.8)%, The concentration of water three respectively (1.6±0.19) mg/L,(0.013±0.003) cm-1,(1.36±0.18) mg/L. Of Powdered Activated Carbon can significantly improve the ultrafiltration membrane-bioreactor system for organics removal efficiency mechanism powder carbon efficient adsorption.