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Wastewater on Cape Cod
1. The Challenge of Wastewater on Cape Cod George Heufelder Barnstable County Department of Health and Environment & Massachusetts Alternative Septic System Test Center [email_address]
4. DAYTIME –Oxygen Production It’s gonna be a long night. O 2 O 2 O 2 O 2 O 2 O 2 O 2 O 2 NIGHT -Oxygen Depletion Decomposition O 2 Respiration O 2 O 2
11. Septic Tank NH 4 + NO 3 - Nitrosomonas – Ammonium to Nitrite Nitrobacter – Nitrite to Nitrate O 2 SOIL ABSORPTION SYSTEM The standard septic system efficiently transforms the nitrogen in wastewater to nitrate which conservatively moves in the groundwater toward the ocean.
14. The challenge, in our geological setting is to Remove Nitrogen from Wastewater
15. Nitrogen from the atmosphere is fixed into tissue by plants We or animals eat the plants We process the food and eliminate excess Nitrogen (as urea) Septic tank bacteria convert urea to ammonium Leachfield bacteria convert ammonium to nitrate Oxygen deprived bacteria convert nitrate to nitrogen gas. Nitrogen returns to atmosphere Advanced treatment units manipulate the nitrogen cycle to return fixed nitrogen to the atmosphere
25. The emerging picture is that large wastewater treatment plants are the most efficient way to remove nitrogen…… But what if ?
26. Other Means of Dealing with Wastewater? (Don’t create so much!)
27. Instead of taking a small amount of waste and adding it to a large amount of water only to have to remove it again later (at quite a cost)
28. Instead of taking a small amount of waste and adding it to a large amount of water only to have to remove it again later (at quite a cost)
29. Instead of taking a small amount of waste and adding it to a large amount of water only to have to remove it again later (at quite a cost)
30. Instead of taking a small amount of waste and adding it to a large amount of water only to have to remove it again later (at quite a cost)
31. Instead of taking a small amount of waste and adding it to a large amount of water only to have to remove it again later (at quite a cost)
32. Instead of taking a small amount of waste and adding it to a large amount of water only to have to remove it again later (at quite a cost) Work Energy Expense
33. Instead of taking a small amount of waste and adding it to a large amount of water only to have to remove it again later (at quite a cost) Work Energy Expense
34. Instead of taking a small amount of waste and adding it to a large amount of water only to have to remove it again later (at quite a cost) Work Energy Expense
35. Why not prevent the small amount of waste from getting into a large amount in the first place.
36. Why not prevent the small amount of waste from getting into a large amount in the first place.
37. Why not prevent the small amount of waste from getting into a large amount in the first place.
38. Why not prevent the small amount of waste from getting into a large amount in the first place.
39. Why not prevent the small amount of waste from getting into a large amount in the first place.
40. Why not prevent the small amount of waste from getting into a large amount in the first place.
41. Why not prevent the small amount of waste from getting into a large amount in the first place.
43. Composting toilets allow for the separation of toilet waste (containing most of the nutrients and pathogens) from “graywater”
44. Composting toilets still need a means for safe graywater disposal Composting Toilets Smaller carousel type compost toilet
45.
46. Foam flush toilet eliminates the objections of the “dark hole”, but creates approximately 500 gallons of liquid waste/year/household.
47. Thinking about that 500 gallons? Let’s do some math…… 1000 homes using composting toilet = 0.5 million gallons per YEAR 1000 homes on sewer using 250 gallons per day produces 0.5 million gallons every two days that require treatment!
50. UREA IS THE MOST ABUNDANT NITROGEN-CONTAINING COMPOUND IN THE WASTE FROM OUR BODIES Although urine makes up only 1% of the total volume of wastewater, it accounts for 50–80% of the nutrient content.
51. Urine diversion may offer the opportunity to recover phosphorus and nitrogen as a fertilizer