Disinfection/Chlorination in Water Treatment Disinfection is a process whereby micro organisms are eliminated through the use of disinfectants, such as chlorine, or ozone, e.t.c. Disinfection can be carried out on a variety of products or things on which these disinfectants are suitable for use. For the purpose of this study we shall limit our scope to disinfection in water only. In water treatment chlorine is the most preferred disinfectant because it is not only the cheapest disinfectant, but, it has been proven by experiment and experience to give a very good effective results, it is also very effective against micro organisms such as bacteria and some viruses but, not very effective against protozoans especially Cryptosporidium. Chlorine also provides a residual protection for water during and after treatment, which prevent recontamination, which other disinfectants such as ozone and U.V cannot provide. For Chlorination to be very effective, it requires a contact time ...
Iron is one of the major secondary contaminant in both domestic and industrial water supply. Iron have caused water industries several billions of dollars . Iron is the second most abundant metal in the earth's crust behind Aluminum(8%), of which iron accounts for about 5%. Elemental iron is rarely found in nature, as the iron ions Fe2+ and Fe3+ readily combine with oxygen- and sulfur-containing compounds to form oxides, hydroxides, carbonates, and sulfides. As rain fall, rain water infiltrates the soil and underlying geologic formations and dissolves iron, causing it to seep into aquifers that serve as sources of groundwater for wells. In surface water, such as rivers and lakes, dissolved iron is hardly ever found, because it readily reacts with oxygen, forms insoluble compounds and sinks out into the bottom of the water body. Iron is seldom found at concentrations greater than 10 milligrams per liter (mg/L) or 10 parts per million. The iron that seep into the sources of g...