Microorganisms in circulating water of power plant bring great harm to cooling water system. It not only affects the effect of heat transfer, but also would lead to corrosion of heat exchanger, in seriously would result in shutdown. Now the plant uses the bactericide to treat with the microbial fouling generally, and a variety of fungicides have been developed. However, the long-term usage of fungicide will make the bacteria appear resistance, which greatly limits the application of such measures. This paper overviewed different resistance mechanisms of Pseudomonas, sulfate-reducing bacteria, iron bacteria and slime forming bacteria in the microbial fouling to bactericide and put forward some solutions.
Benzalkonium Chloride is one of the Quaternary ammonium class of Cationic surfactants, belonging to nonoxidizing biocide. It is widely used as a disinfectant in the Hospital, Livestock and Personal Hygiene sectors
Isothiazolinones is a kind of fungicidal with properties of broad spectrum, high efficiency, low toxicity and non-oxidative, it is the ideal biocidal in industrial circulating cool water system and in wastewater treatment in oilfield, papermaking, pesticide, cutting oil, leather, detergent and cosmetics etc..
SDIC is water soluble, it has properties of high effective, instant effective, wide range and safety. SDIC has strong fungicide effect, even at dosage of 20ppm, the fungicide ratio can reach to 99%.
TH-409 is composed of cationic surfactant, penetrating agent and dispersant. TH-409 has the advantages of high efficiency, wide range, sterilization, fungicidal, sludge stripping and cleaning