Judging that the water quality is polluted by feces, the detection of E. coli will not be wrong!

Water pollution has seriously damaged the ecological balance and caused many harms to human beings. Therefore, relevant departments have taken corresponding measures to monitor the water quality to determine the degree of water pollution. So which kind of test can determine whether the water is polluted? In this chapter, the manufacturers of water quality online monitors will make a simple analysis with you! What is E. coli? Escherichia coli (Escherichia coli), also known as Escherichia coli, was discovered by Escherich in 1885. Escherichia coli is an opportunistic pathogenic bacterium, which can cause gastrointestinal tract infection or urinary tract and other local tissue and organ infections in humans and various animals under certain conditions. Therefore, in the field of water purification and sewage treatment, Escherichia coli has long been selected as an indicator species for the degree of water pollution, marking how much human feces exists in the water, and its measurement standard is the coliform index. The main reason for using Escherichia coli as a standard is that the number of coliform bacteria in human feces is much higher than that of pathogenic bacteria (such as Salmonella typhi, which can cause typhoid fever). In addition, Escherichia coli is harmless in most cases and will not be removed from the experiment. room“ escape” and harm human beings. The use of E. coli as an indicator of fecal contamination may also lead to misleading conclusions, since E. coli can also be present in large numbers in other settings, such as paper mills. Detect Escherichia coli to judge whether the water quality is polluted by feces. Escherichia coli is easily detected in contaminated water (especially feces pollution). The indicator bacteria for judging that the water body may be contaminated by feces include total coliforms, heat-resistant coliforms, and large coliform bacteria. bacilli. Hygienic Standards for Drinking Water (GB 5749&--dash;2006 ) set limit value requirements for these three indicators. As the indicator bacteria of fecal contamination, the detection of Escherichia coli is of great significance, and the detection of heat-resistant coliforms and total coliforms is of less hygienic significance. Therefore, the Hygienic Standard for Drinking Water (GB5749&--dash;2006) requires that 100mL water samples shall not detect E. coli. In addition, if the total coliforms are detected by the Escherichia coli online analyzer, the detection of heat-resistant coliforms or Escherichia coli must also be carried out. If heat-resistant coliforms or Escherichia coli are detected in the water samples, it indicates that the water quality may be seriously polluted and corresponding measures must be taken.