Application Of Antibacterial Materials In Circulating Cooling Water System

The industrial circulating cooling water has the characteristics of suitable temperature and higher concentration of dissolved oxygen,which can easily cause microbe development,resulting in water quality deterioration and formation of biological slime,and leading to decrease of heat transfer efficiency,pipeline corrosion,increase of energy consumption in water pipelines and blockage of cooling equipment and water pipelines,which threaten the normal operation of industrial enterprises,meanwhile,the current commonly used chemical fungicides easily cause secondary pollution.Therefore,it is urgent to develop stable and environmentally friendly antibacterial materials,used in circulating cooling water.So the application of graphene composite antibacterial materials and bio-enzyme inhibitors in circulating cooling water are mainly researched.The results show that:(1)When the mass fraction of GO was 35%,the antibacterial property of nano ZnO-GO composites was strongest;and when the usage of nano ZnO-GO composites was 160mg/L,the antibacterial rate was up to 97.16% in circulating cooling water.(2)When the mass fraction of RGO was 15%,the best antibacterial property of nano Cu/ZnO-RGO composites was reached;and when the usage of nano Cu/ZnO-RGO composites was 120mg/L,the antibacterial rate was up to 96.76% in circulating cooling water.(3)Nano ZnO-GO composites could seriously damage the cell structure of Escherichia coli,resulting in largely outflow of cellular contents,the rate of protein leakage increased by 9.3 times and leading to the growth of Escherichia coli exponentially reached the exponential growth phase prolonged over 12h;Nano ZnO-GO composites could damage the cell membrane structure of Staphylococcus aureus,but the cell morphology changed little,the rate of protein leakage increased by 7.2 times,and the growth of Staphylococcus aureus reached the exponential growth phase prolonged by about 14 h.(4)Nano Cu/ZnO-RGO composites could seriously damage the cell structure of Escherichia coli,resulting in largely outflow of cellular contents,the rate of protein leakage increased by 8.1 times and leading to E.coli cannot enter the exponential growth phase within 24h;Nano Cu/ZnO-RGO composites could damage the cell membrane structure of Staphylococcus aureus,the rate of protein leakage increased by 6.7 times,and E.coli growth enter the exponential growth phase prolonged over 22 h.(5)When the mass fraction of nano ZnO-GO composites was 2.33%,the antibacterial rate of nano ZnO-GO/PU composite antibacterial coating was up to 90.29%,with 4H pencil hardness and 92.3% anti-corrosion performance.(6)When the mass fraction of nano Cu/ZnO-RGO composites was 2.00%,the antibacterial rate of nano Cu/ZnO-RGO/PU antibacterial coating was up to 94.35%,with 5H pencil hardness and 93.3% anti-corrosion performance.(7)The inhibition rate of immobilized lysozyme compound inhibitors was up to 93.3%,and the optimum conditions were 0.8g/L immobilized lysozyme,20mg/L of PASP,10mg/L ATMP.The compound inhibitors could simultaneously inhibit the anodic dissolution and cathodic hydrogen evolution process of carbon steel coupons,and caused self-corrosion potential of carbon steel coupons move positively,which were mixed corrosion inhibitors dominated by anodic reaction.