1. DDI-HeatExchangers Inc. www.ddi-heatexchangers.com DDI Since 1980

2. Poster

4. Sketch AnaerobicDigestionSketch AnaerobicDigestion

5. Advantages

6. These 2 HX have been in continuous non-stop operation for 9 years without any maintenance

7. Napanee Napanee

8. Pembroke

9. Comparison FlierComparison Flier

10. Payback is possible in 1 year

11. Energy Saved (15 Years)Energy Saved (15 Years)

12. Energy ROI

13. Electricity Cost

14. CogenerationCogeneration

15. DDI HX

16. D D I O u t li n e

17. Tube Disadvantages –HeatAreaTube Disadvantages –HeatArea

18. Tube Disadvantages - LengthTube Disadvantages - Length

19. Tube Disadvantages - SludgeTube Disadvantages - Sludge

20. DDI Sketch w/ advantagesDDI Sketch w/ advantages

21. SPIRAL technology gets BLOCKED, Max. gap is only 1” and has pins for other liquid (no % solids there). - 1“-

22. TUBE Technology cannot have same flow for both liquids, and 3” gap each, at the same time.

23. Drawing Drawing

25. Vitalix 65-70 % Solids Molasses 12 Sep 2007 12 Sep 2007 Vitalix Inc. has been using the DDI heat exchanger almost a year now with very positive results. Raw molasses at 65% to 70% solids is running on one side and hot water on the other. We have had no problems with plugging or pressure build up. We are also very pleased with the effectiveness of this unit in heat transfer. Thank you for your help and support. Vitalix Inc. has been using the DDI heat exchanger almost a year now with very positive results. Raw molasses at 65% to 70% solids is running on one side and hot water on the other. We have had no problems with plugging or pressure build up. We are also very pleased with the effectiveness of this unit in heat transfer. Thank you for your help and support. Plant Mgr. Doug Olson Plant Mgr. Doug Olson 308-762-8358 308-762-8358 Vitalix Inc. Vitalix Inc. Alliance NE. Alliance NE.

26. Pembroke Direct Sludge-to-Sludge From: David Atkinson Sent: September 7, 2007 11:23 AM To: 'erwin@ddi.ca' Subject: Letter of Reference From: David Atkinson Sent: September 7, 2007 11:23 AM To: 'erwin@ddi.ca' Subject: Letter of Reference The Pembroke Pollution Control Centre is using the DDI Heat Exchanger with very positive results. Raw sludge with an average temperature between 11* C to 19* C flows through one side of the heat exchanger and re-circulated sludge from the digesters with temperatures ranging in the high thirty’s flows through the opposite side of the heat exchanger. This has resulted in substantial savings as the raw sludge is increased in temperature prior to entering the digesters at no expense to the City sewage system. After almost two years of operation no plugging has occurred and it works as per specification. I am very satisfied with the results of this piece of equipment. The Pembroke Pollution Control Centre is using the DDI Heat Exchanger with very positive results. Raw sludge with an average temperature between 11* C to 19* C flows through one side of the heat exchanger and re-circulated sludge from the digesters with temperatures ranging in the high thirty’s flows through the opposite side of the heat exchanger. This has resulted in substantial savings as the raw sludge is increased in temperature prior to entering the digesters at no expense to the City sewage system. After almost two years of operation no plugging has occurred and it works as per specification. I am very satisfied with the results of this piece of equipment. David Atkinson David Atkinson City of Pembroke City of Pembroke Utilities Superintendent Utilities Superintendent Office 613-735-6821 ext. 1490 Office 613-735-6821 ext. 1490 Fax 613-732-7028 Fax 613-732-7028

27. Doors opened after 8.5 years Doors opened after 8.5 years

28. The Gaskets after 8.5 Years

29. Inside – Clean and without damage after 8.5 years

30. Viscosity Influence on required area

31. Representatives

33. Links Personnel Personnel Personnel (http://www.ddi-heatexchangers.com/resume.htm) Other Products Other Products Other Products Other Products (http://www.ddi-heatexchangers.com/other_products.htm) DDI can supply Parker Boiler & Pumps too DDI can supply Parker Boiler & Pumps too DDI has PIG CLEANING option DDI has PIG CLEANING option

34. Sample Quote

35. Tulsa OK, Via Ashbrook and HDR Tulsa OK, Via Ashbrook and HDR

36. Rialto- EnerTech via HDR Rialto- EnerTech via HDR 11 Heat Exchangers- all phases. 11 Heat Exchangers- all phases.

37. Molasses with 65 % Solids Molasses with 65 % Solids Vitalix Vitalix

38. DDI HX and Boiler set DDI HX and Boiler set DDI in Pontiac with Boiler combined- (Cover removed) DDI in Pontiac with Boiler combined- (Cover removed)

39. Building’s Sewage Heat Recovery Building’s Sewage Heat Recovery RECOVERING HEAT from the Hot liquids leaving the Suites (i.e. Sewage with % Solids) at about 20-28 deg C. RECOVERING HEAT from the Hot liquids leaving the Suites (i.e. Sewage with % Solids) at about 20-28 deg C. Directly to… Directly to… Cold Water entering the Building before the Boiler, at about 2-10 deg C. Cold Water entering the Building before the Boiler, at about 2-10 deg C.

40. Man-Hole (video on the web) Man-Hole (video on the web)

41. Davit Arm – swings door in limited space Davit Arm – swings door in limited space

42. DDI Logo - FinalDDI Logo - Final