Download Basic Water and Wastewater Treatment by T H Y Tebbutt (Auth.) PDF

By T H Y Tebbutt (Auth.)

This quantity goals to mix the functions of straightforward programming in uncomplicated with an realizing of these facets of water/wastewater therapy engineering that are expressed through mathematical relationships or which require a decision-making series. Waste and wastewater remedy is a vital quarter of engineering and the themes chosen illustrate the multidisciplinary facets of the topic. The courses were written in uncomplicated on an Amtrad PC1640

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To assess the importance of water pollution in a particular case it is essential to have some way of determining the use to which the receiving water will be put. A degree of pollution which would be quite unacceptable in a river used for salmon fishing and drinking water abstraction could be insignificant in the lower reaches of a river used mainly for drainage and naviga­ tion. The use of fixed emission standards to control pollution does not allow for different usages, and although popular with bureaucrats, such pollution control measures are not scientifi­ cally valid.

Alternatively, a n u m b e r of empirical relationships are available which predict reaeration coefficient values on the basis of mean velocity and mean depth of flow. Using mathematical expressions for B O D uptake and oxygen transfer it is possible to formulate a mathematical model for the dissolved oxygen concentration downstream of a discharge or confluence. T h e model simplifies the situation in that only the processes of B O D u p t a k e and reaeration are taken into account, but since these are normally by far the most important factors the simplification does not usually produce significant errors.

2 E n t e r vol of acid to m e t h y l o r a n e e end point (ml)? 9 T o t a l a l k a l i n i t y - 5 9 6 m e / 1 as c a l c i u m c a r b o n a t e C a u s t i c a l k a l i n i t y - 3 6 8 m e / 1 as c a l c i u m c a r b o n a t e Hydroxide Carbonate Another alkalinityalkalinity- set of results IttO m e / 1 U36 m e / 1 (Y/N)? Ν Program notes (1) Lines 10-50 set up title (2) Lines 6 0 - 8 0 input titration data (3) Line 90 checks for incorrect data, total alkalinity cannot be less than the caustic alkalinity, returns to 70 if error exists (4) Lines 100-140 calculate and print alkalinity results (5) Line 150 condition for bicarbonate alkalinity only, if t r u e , program j u m p s to 230 (6) Line 160 condition for bicarbonate and carbonate alkaHn­ ity, if true, program j u m p s to 210 (7) Line 170 calculates and prints hydroxide alkalinity (8) Line 180 condition for hydroxide alkalinity only, if t r u e , program j u m p s to 240 (9) Line 190 calculates and prints carbonate alkalinity (10) Line 200 causes program to skip lines which refer to forms of alkalinity which have been eliminated by this stage Worked examples 33 (11) Line 210 calculates and prints c a r b o n a t e alkalinity (12) Line 220 condition for no bicarbonate alkalinity, if t r u e , program j u m p s to 240 (13) Line 230 calculates and prints bicarbonate alkalinity (14) Lines 240-260 offer a n o t h e r calculation if desired Example 3 A BOD DATA: BOD data analysis Write a program to accept B O D data obtained over several days and use the T h o m a s M e t h o d to calculate the ultimate B O D and the rate constant for the sample.

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