Drinking water treatment includes Mechanical filtration and Microbial sterilization.
It is necessary to disinfect drinking water, thus pathogenic microorganisms will be killed and assure drinking water safety. So far, using chlorine, chloramine, ozone and UV are the main methods of disinfection. The main by-product of disinfectant is chloroform, dichloroacetic acid, bromate, formaldehyde , chlorate and so on. Only if the by-product of disinfectant does not exceed the standard rule, it is not harmful to humans.
Microorganism index: Microorganism index includes four requirements: natural microflora, coli, yeast and mold. According to the testing situation of pure water in recent years, microorganism is easily unqualified. This is because microbial contamination will appear in producing, transporting, selling and other procedures. During producing, workers’ careless about personal hygiene, unqualified disinfection of recycled bottles, and even some deformed bottle caps are used, these situations all will cause the microorganism exceed standard rules. Coli reach certain quota will cause diarrhea; pathogenic microorganisms includes salmonella, shigella, Staphylococcus aureus and beta streptococcus will cause diarrhea, fever, even life- threatening problem; mould and yeast which are widely existent in nature will lower the taste of foods, cause chronic intoxication, even cancer.
