Lectures - Water Treatment

Secondary treatment biological θ fv s in θ fm s in

Info icon This preview shows pages 4–6. Sign up to view the full content.

Secondary treatment - biological – θ, F/V = S in / θ , F/M = S in / θ X, θ C Tertiary treatment Physical / chemical Chemical precipitation - phosphorus removal Adsorption - trace organic removal Filtration - groundwater discharge or irrigation use Membrane filtration - trace everything removal Biological - N, P removal Flow sheet see Fig.11-9, p.473 in D&M Sludge treatment ( “stabilization” ) Septic tanks ( optional ) see Figure 11-3, p.466 in D&M
Image of page 4

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Discharge Surface waters Ground water “Deep” aquifer “disposal” “Shallow” aquifer – “indirect” reuse Injection well Percolation Spray, Pond NPDES permits see Table 11-7, p.465 in D&M WATER REUSE Goal : reduce potable water use ( conserve water resources ) Most common use : irrigation Limited use on food crops fear of contamination, esp. viruses Golf courses Landscaping residential and streets, parks Different from “recycle” (direct return to potable water system) illegal Indirect Reuse discharge of waste water to source of potable water – legal Industrial cost effective (due, in part, to limited number of contaminants) STORMWATER TREATMENT OPTIONAL Retention of runoff “drainage” ponds Required whenever construction “covers” ground surface Designed primarily for solids “removal” (sedimentation) Design may facilitate or prevent percolation Number of “outfalls” makes centralized treatment impractical Sewer (collection) systems Separate sanitary, storm water Combined Non-point discharges run-off from lawns, agriculture Typical Contaminants Refuse litter Solids – erosion, accidental spills from vehicles, fibers (multiple sources) Oil, grease Metals (from vehicles, including tires) N, P fertilizer Priorities Little effect on human health Contaminants removed in potable water treatment Pathogens seldom survive “run-off” Probably less significant than airborne transport of contaminants Aesthetics - may affect “non-consumptive” use of receiving water
Image of page 5
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.
  • Fall '11
  • Dr.Jennings
  • Colloids, Removal Processes, D&M

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern