Water quality problems

Water quality problems

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Water quality problems

A rule of thumb suggests that 1 mg/L of alum destroys 0.5 mg/L of alkalinity as CaCO₃.

1.Use your knowledge of coagulation chemistry to prove that this is approximately true

2.Using this rule of thumb, would the natural alkalinity of the water shown below be sufficient to add 80 mg/L alum, or would we need to add NaOH to prevent the pH from dropping?

A square rapid-mixing basin, with a depth of water equal to 1.25 times the width is to be designed for a flow of 2.0 million gallons per day. The RMS velocity gradient (G) is to be 790 s-1, the detention time is 40 sec, the operating temperature is 50^oF, and the turbine shaft speed (i.e. the impeller rotation speed) is 100 rpm. Calculate:

RUBRIC
Excellent Quality 95-100%	Introduction 45-41 points The background and significance of the problem and a clear statement of the research purpose is provided. The search history is mentioned.		Literature Support 91-84  points The background and significance of the problem and a clear statement of the research purpose is provided. The search history is mentioned.			Methodology 58-53 points Content is well-organized with headings for each slide and bulleted lists to group related material as needed. Use of font, color, graphics, effects, etc. to enhance readability and presentation content is excellent. Length requirements of 10 slides/pages or less is met.
Average Score 50-85%	40-38 points More depth/detail for the background and significance is needed, or the research detail is not clear. No search history information is provided.		83-76  points Review of relevant theoretical literature is evident, but there is little integration of studies into concepts related to problem. Review is partially focused and organized. Supporting and opposing research are included. Summary of information presented is included. Conclusion may not contain a biblical integration.			52-49  points Content is somewhat organized, but no structure is apparent. The use of font, color, graphics, effects, etc. is occasionally detracting to the presentation content. Length requirements may not be met.
Poor Quality 0-45%	37-1 points The background and/or significance are missing. No search history information is provided.		75-1 points Review of relevant theoretical literature is evident, but there is no integration of studies into concepts related to problem. Review is partially focused and organized. Supporting and opposing research are not included in the summary of information presented. Conclusion does not contain a biblical integration.			48-1 points There is no clear or logical organizational structure. No logical sequence is apparent. The use of font, color, graphics, effects etc. is often detracting to the presentation content. Length requirements may not be met
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Water quality problems

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