Project 2.2: Enhanced Energy Recovery through Optimization of Anaerobic
Digestion and Microturbines
Project Manager - CH2M Hill
Project Overview
Goals and Objectives
The objectives of Enhanced Energy Recovery through Optimization of
Anaerobic Digestion and
Microturbines project are to:
- Increase and optimize digester gas production through thermal
hydrolysis and ultrasound processes
- Develop and optimize cost effective gas cleanup systems
- Evaluate and quantify environmental benefits that result from using microturbines at sewage treatment plants
- Evaluate performance and cost during operation so sewage treatment plants have greater certainty on cost
and reliability of using microturbines
Projected Outcomes
The first outcome will be to develop and optimize gas cleanup systems. At least three gas cleaning systems
will be defined and optimized. It is anticipated that one of these systems will involve
hydrogen sulfide removal, gas drying, and
siloxane removal. A second system will likely
involve gas drying and siloxane removal. A third system, with parameters not yet
defined, will also be formulated. The installed and operating cost for each of
these systems will be determined for the full project lifecycle.
A detailed evaluation and quantification of environmental benefits for each of the systems described above
will also be developed. These will be presented in the context of the Capstone microturbine. A comparison to
the existing conditions will be included in this assessment. The expected outcome will be to increase gas production
by 10 to 20% at an existing wastewater treatment plant, which ranges in size from 1 to 50 gpm. Also on this project,
the Contractor will seek to improve the efficiency and cost-effectiveness of gas cleaning systems used on microturbines,
but in this part of the project it may make more sense to test the work at an existing facility rather than install
new generation. The expected cumulative generating capacities resulting from this project is expected to range from
60kW to 1 MW.
The results of this work will be documented in a report that evaluates the cost and effectiveness of the various gas
cleanup systems for each of the microturbines considered. The economics of the systems will be evaluated based on the value
of electricity produced and waste heat recovered and used at the sewage treatment plant. Various alternatives will be
compared by examining the net present value of different systems and the
rate of return based on funds utilized.
For the digester gas production improvement processes (thermal hydrolysis and ultrasound), the focus will be on evaluation
of the systems, their impact on gas production, and their cost effectiveness. An evaluation of the digester gas production
and quality as well as biosolids reduction rate and
dewatering characteristics will be presented. The installation and operating
costs for the systems will be established for full-scale facilities. The cost-effectiveness evaluation will include the overall
installation and operating cost compared to the benefits of improved gas production and reduces biosolids mass for disposal/reuse.
A detailed evaluation and quantification of environmental benefits for each of the systems will also be developed.
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Publications, Reports and Other Deliverables for Project 2.2: Enhanced Energy Recovery through Optimization of Anaerobic
Digestion and Microturbines Project
List of Publications, Reports and Other Deliverables
Project 2.2 Monthly Status Reports
NOTE: All finalized deliverables are available in Adobe Acrobat PDF format. To
obtain a free copy of Adobe® Acrobat® Reader®, please click here.
Task 2.2.1: Process Selection
Task 2.2.2: Site Selection and Test Plan
Task 2.2.3a: Design Microturbine and Gas Cleaning Systems
- Microturbine and Gas Cleaning System Design and Construction Drawings; Mechanical, Electrical, Instrumentation/Controls, and Site/Civil Drawings
Please note that due to large file size, this deliverable is posted in multiple parts. Files may take some time to load.
Task 2.2.3b: Design Thermal Hydrolysis and Ultrasound Systems
- Thermal Hydrolysis and Gas Cleaning System Design and Construction Drawings; Mechanical, Electrical, Instrumentation/Controls, and Site/Civil Drawings
Please note that due to large file size, this deliverable is posted in three parts. Files may take some time to load.
Task 2.2.4a: Install Microturbine and Gas Cleaning Systems
Task 2.2.4b: Install Thermal Hydrolysis and Ultrasound Systems
Task 2.2.5: Collect and Analyze Data for Microturbine and Gas
Cleaning System and Optimized Anaerobic Digestion System
- First Quarterly Data Report: June 1 - August 31, 2004 (PDF, 205 KB)
- Second Quarterly Data Report: September 1 - November 30, 2004 (PDF, 543 KB)
- Third Quarterly Data Report: December 1 - February 28, 2005 (PDF, 770 KB)
- Fourth Quarterly Data Report: March 1 - May 31, 2005 (PDF, 610 KB)
- Fifth Quarterly Data Report: June 1 - September 30, 2005 (PDF, 230 KB)
- Sixth Quarterly Data Report: October 2005 - January 2006 (PDF, 400 KB)
Task 2.2.6: Prepare Final Report for Project 2.2
Task 2.2.7: Coordinate with Renewables Project Advisory
Committee
Task 2.2.8: Evaluate Project
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