Transcription of 6. Water treatment
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6. Water treatment
6. Water treatment . 71. 6. Water treatment Introduction Water can be contaminated by the following agents: Pathogens disease-causing organisms that include bacteria, amoebas and viruses, as well as the eggs and larvae of parasitic worms. Harmful chemicals from human activities (industrial wastes, pesticides, fertilizers). Chemicals and minerals from the natural environment, such as arsenic, common salt and fluorides. Some non-harmful contaminants may influence the taste, smell, colour or temperature of Water , and make it unacceptable to the community. Water from surface sources is often contaminated by microbes, whereas groundwater is normally safer, but even groundwater can be contaminated by harmful chemicals from human activities or from the natural environment.
upflow sand filters, compared to filters in which the water flows downwards. Charcoal filter Granular charcoal (or granu- — ☺☺ ☺☺ ☺ ———☺☺☺ — ☺ lated activated carbon) can be used in filtration and is effective in improving the taste, odour and colour of the water. How-ever, it should be replaced regularly, because ...
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