Carbon Heat Energy Assessment and. (CHEApet) Tutorials: Background on CHEApet

Transcription

1 Carbon Heat Energy Assessment and Plant Evaluation Tool (CHEApet) Tutorials: Background on CHEApet

2 Tutorials WERF Optimization Challenge What is CHEApet? How is CHEApet used? What s Included? What s Not included? What s planned for Future Versions?

3 WERF Optimization Challenge Objective: Develop methods and technologies that will allow the wastewater sector to achieve treatment goals while reducing the resources expended by 20% (energy and resources) as well as a 20% reduction in solids. 20/20/20 goal Best Practices for Sustainable Wastewater Treatment: European Experience, Case Study, and Evaluation Tool Concept Development (WERF, 2009). Energy Efficiency in Wastewater Treatment in North America (WERF) 3

4 WERF Optimization Challenge Outcome suggested a tool is necessary to model performance and energy consumption of WWTPs 4

5 What is CHEApet? Carbon Heat Energy Assessment and Plant Evaluation Tool No Cha Cha Cha It s a static whole plant simulator Online MS Excel based tool You can download your inputs and outputs but not the tool Provides calorific, energy and thermal balances as well as carbon footprint A tool for everyone

6 How is CHEApet used? Intended for users to create a rough estimate of an existing facilities energy efficiency and carbon footprint Allow for users to relatively compare upgrade scenarios to reduce a facilities energy consumption and/or carbon footprint Upgrades could include Switching from aerobic digestion to anaerobic digestion Utilizing Anaerobic digestion biogas in a combined heat and power (CHP) system Upgrading facility motors to premium efficiency motors Evaluating more efficient aeration technologies Utilizing thermal recovery for supplemental building heat

7 What s Included in CHEApet? Liquids processing influent pumping screening and grit removal primary treatment plant blending secondary treatment Secondary treatment/aeration equipment secondary clarification or membrane equipment RAS/WAS S pumping p tertiary filtration ultraviolet (UV) disinfection effluent ent pumping Solids processing primary sludge pumping primary sludge thickening i WAS thickening sludge stabilization (Aerobic, Anaerobic) sludge dewatering sidestream treatment

8 Process Flow Diagram 8

9 What s Included? Secondary Treatment t 8 Processes with either MBR or Secondary Clarifier Nitrification cato MLE 4 Stage Bardenpho A/O A2/O UCT 5 Stage Bardenpho Johannesburg Carbon Footprint Protocols Supplemental Carbon Addition Methanol (99%) Acetic Acid 50% Sugar Water Glycerol Local Government Operations Protocol (LGOP) Australian Approach Informal Approach

10 What s Included? Other fun stuff to play with Data output to BEAM tool for residuals disposal/reuse options ca/ou wo html?catego y_id=137 Currently BEAM is for Canadian users, but a well versed user could easily alter it for use in the U.S. Output data to WERF LCAMER tool Upgradeable motor efficiencies Multiple supplemental carbon addition alternatives Methanol, Acetic Acid, Sugar Water, Glycerol Multiple Scenario comparison Aeration efficiency upgrades

11 What s Included? Calculation Models Used (See User Manual for More Details) Unit Process Model Source Reference Primary Clarification Secondary treatment activated sludge Secondary clarification sludge thickening Solids Removal - Mass Balance ASMN Hiatt and Grady (2008) Solids flux analysis Baskin and Suidan (1985), Daigger (1995) Tertiary treatment filtration Solids Removal - Mass Balance Solids thickening Solids Removal - Mass Balance Aerobic digestion Aerobic Digestion Daigger and Grady (1995) Anaerobic digestion Anaerobic Digestion Gossett and Belser (1982) Dewatering Solids Removal - Mass Balance Sidestream treatment ASMN Hiatt and Grady (2008)

12 What s not included? CHEApet is not all inclusive Biological processes that CHEApet currently cannot simulate: No TP Removal (Chemical/Biological) No 2-stage Carboneous-Nitrification Systems No Step Feed No Oxidation Ditch You can still use CHEApet just choose a process that most closely resembles your process. Some other noteworthy items Energy/Carbon Footprint calculations designed around Energy/Carbon Footprint calculations designed around North America (US and Canada) as well as Puerto Rico

13 How should CHEApet be used? CHEApet should be used to relatively compare options. Lots of assumptions are made within the model to make it generic and therefore, usable by as many people as possible. It still can be used for WWTPs with slight variations in the process by choosing the configuration that most closely resembles the WWTP being modeled. Therefore, the results may not be 100% accurate for your facility. However, whatever error is included, will be within any comparative scenarios, so you can still compare the results relatively. CHEApet is NOT a design tool CHEApet is NOT a reporting tool To create a more accurate, site specific, model conduct a selfassessment or hire a consultant

14 What s planned for Future Versions? The following upgrades have been suggested for CHEApet 2.0 Biological and Chemical phosphorus removal Phosphorus recovery by struvite Heat Drying Global power production emissions factors Additional recovery technologies Supplemental alkalinity addition Lime Stabilization New Processes: Two Stage Activated Sludge Step Feed BNR Step Feed Non-BNR Oxidation Ditch

15 What s planned for Future Versions? The following upgrades have been suggested for CHEApet 2.0 (Continued) Chlorine Disinfection and Dechlorination Embed the BEAM tool into CHEApet and allow for use on US and Puerto Rican facilities Anonymous submission of CHEApet existing facility data to WERF to allow for the development of benchmarks and comparisons for CHEApet users

16 Resources Best Practices for Sustainable Wastewater Treatment: European Experience, Case Study, and Evaluation Tool Concept Development (WERF, 2009). Energy Efficiency in Wastewater Treatment in North America (WERF, 2010) One Plant s Journey to Sustainable, Energy-Neutral Performance, WERF s 2010 Webinar Series (August 25, 2010). Speakers: Fillmore, Crawford, Katehis, and Johnson