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83: Visit to Burham Water Supply Works 1) When was Burham Water Supply Works built? _______________________________________________________________ 2) Why is it necessary to clean water from rivers? _______________________________________________________________ 3) Which river does Burham take its water from? _______________________________________________________________ 4) What is the cleaned water from Burham used for? _______________________________________________________________ 5) Name two towns which receive drinking water from Burham. _______________________________________________________________ 6) What is the name of the lake which holds the water from the river before it is taken to Burham Water Supply Works? _______________________________________________________________ 7) Name two things which settle to the bottom of the lake. _______________________________________________________________ 8) How long does the water stay in the lake? _______________________________________________________________ 9) Where is the water sent to next? _______________________________________________________________ Inlet retention chambers 10) Where does the water go after the pre-ozone tank? _______________________________________________________________ 11) What chemical is added to the water? _______________________________________________________________
12) What is the name of the fluffy white substance? _______________________________________________________________ 13) What happens to the floc in the second retention chamber? _______________________________________________________________ Clarification process 14) Where does the water go after the retention chambers? _______________________________________________________________ 15) Does the water enter at the top or the bottom of these tanks? _______________________________________________________________ 16) What forms into a thick white/cream layer? _______________________________________________________________ 17) What does the floc trap as the water travels upwards? _______________________________________________________________ 18) Where is the floc collected? _______________________________________________________________ 19) Why is this floc collected? _______________________________________________________________ 20) The water then enters channels which take it to the next stage. What is the next stage? _______________________________________________________________ Filtration 21) How many filters are there? _______________________________________________________________ 22) What is removed by the filters? _______________________________________________________________ 23) Where is the water sent to next? _______________________________________________________________
Pesticide removal 24) Why is ozone pumped into the water in the ozone contact tanks? _______________________________________________________________ 25) What is the name of the things which pump ozone into the tanks? _______________________________________________________________ 26) Where does the ozone come from? _______________________________________________________________ 27) Why is sodium biosulphate put into the water after the ozone has been pumped in? _______________________________________________________________ 28) Where does the water go next? _______________________________________________________________ 29) What is removed in the Adsorbers? _______________________________________________________________ Sterilisation 30) What chemicals are added to the water in the contact tanks? _______________________________________________________________ 31) What does the chlorine kill? _______________________________________________________________ 32) Why is sulphur dioxide gas added to the water in the contact tank? _______________________________________________________________ 33) Where is the water stored before it is sent to the two service reservoirs? _______________________________________________________________ 34) Name the two service reservoirs that the clean water is pumped to when it leaves Burham? _______________________________________________________________ 35) What are these service reservoirs made of? _______________________________________________________________ 36) Where do you think the water goes to once it leaves the service reservoirs? _______________________________________________________________
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