循环冷却水水质对生物粘泥活性的影响研究

Effects of Water Quality on Activity of Biofouling in Recirculating Cooling Water System

受补充水水质的影响,循环冷却水水质会在一定范围内波动,为此考察了营养物质(BOD5、TP、NH4+-N)、颗粒物质(CaCO3)、无机离子(Ca2+、Mg2+、Na+、Fe3+)对循环水中生物粘泥活性的影响。研究结果表明,循环冷却水水质对生物粘泥的活性有较大影响,当BOD5≤25 mg/L、NH 4+-N<5 mg/L、TP≤1 mg/L时,可将粘泥活性控制在较低水平。在低营养水平条件下,分别维持CaCO3<40 mg/L、Ca2+<100 mg/L、Mg2+≤100 mg/L、Na+<50 mg/L、Fe3+<0.5 mg/L时,可有效抑制粘泥活性,控制粘泥中细菌的生长繁殖。

Due to the influence of make-up water quality, the water quality of recirculating cooling water system would fluctuate within a certain range. So the effects of necessary nutrients （ BOD5 , TP and NH4＋ - N） , suspended particles （CaCO3） and inorganic ion （ Ca2 ＋ , Mg2 ＋ , Na ＋ and Fe3＋ ） content on activity of biofouling in recirculating cooling water system were investigated. The results show that the water quality of recirculating cooling water system has significant effect on the activity of biofouling. When BOD5 and TP are equal to or less than 25 mg/L and 1 mg/L respectively, NH4 - N is less than 5 rag/L, the activity of biofouling can be controlled at a low level. Under low nutrient conditions, keeping CaCO3 , Ca2＋ , Na ＋ , Fe3＋ and Mg2＋ at less than 40 mg/L, 100 mg/L, 50 mg/L, 0.5 mg/L and equal to or less than 100 mg/L respectively can effectively inhibit the activity of biofouling and control the growth and reproduction of bacteria in biofouling.