Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Session Overview
Session 08B: Secondary Treatment
Monday, 22/Oct/2018:
3:00pm - 5:15pm

Session Chair: Mike McKamey, Beaver Equipment;
Location: Boise Centre West 110A/110B
Boise Centre Ground level, across side hall from Exhibit Floor

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3:00pm - 3:45pm
ID: 132 / Session 08B: 1
Main Technical Program
Topics: EBNR, nitrogen and phosphorus management
Keywords: Nitritation, EBPR, post-anoxic denitrification

Toward Achieving Mainstream Nitritation with Post-Anoxic EBPR

Jason Mellin

University of Idaho, United States of America;

Due to the potential for significant energy savings, achievement of stable nitritation for treatment of municipal WRRF mainstreams has received increasing research attention in recent years. Despite this attention, practical implementation by full scale facilities remains difficult. Specific challenges include lower wastewater temperatures, lower influent nitrogen, and variable influent loading, as compared to conditions realized in the most conventional sidestream treatment (i.e., ANAMMOX). Moreover, achieving stable nitritation within a biological nutrient removal process is hindered by additional factors, including competition for nutrient resources between different microbial groups. Recent research at UI has indicated, however, that a nitritation process coupled to EBPR in a post-anoxic configuration is viable and holds the potential for significant energy savings while achieving low effluent ammonia, NOx, and phosphorus concentrations. Furthermore, this process has the potential to provide a microbial source for bioplastic production, thereby further advancing the Resource Recovery concept. This presentation will discuss research performed at the University of Idaho on this EBPR process, with a focus on operating parameters, aeration and ammonia control strategies, process resiliency, and relevant microbial species interactions and metabolisms. In addition, the potential benefits and feasible implementation of this process at full scale facilities will be discussed.

Brief Biography and/or Qualifications
Jason Mellin is currently pursuing a PhD. in Civil Engineering at the University of Idaho. He obtained a Bachelor of Science in Civil Engineering from UI and worked as an engineer in consulting previous to returning to school; he earned his MSc in Civil Engineering from UI in May 2017. In addition, he was a PNCWA scholarship award recipient in 2014 and 2017.

3:45pm - 4:30pm
ID: 155 / Session 08B: 2
Main Technical Program
Topics: EBNR, nitrogen and phosphorus management
Keywords: VFA, Phosphorus, Filtrate, EBNR, EBPR

Optimizing Volatile Fatty Acid Filtrate Extraction from Fermented Primary Sludge

Austin Carnes, Ron Gearhart, Zane Custer, Tony Harmon

City of Boise, United States of America;

The West Boise Water Renewal Facility was found to be constrained in its capacity to biologically remove phosphorus due to a limited supply of volatile fatty acids (VFAs), the preferred food source of phosphorus accumulating organisms. West Boise’s supplemental VFAs are produced by side stream primary sludge fermentation. A VFA rich filtrate is extracted from the fermented primary sludge (FPS) using rotary screen thickeners (RSTs). An optimization study of this extraction process was undertaken to determine if the supply of VFAs delivered to the treatment process could be increased. It was hypothesized that the thickened, fermented primary sludge (TFPS) that was being sent to digestion contained significant residual VFAs. To test this hypothesis, several samples of TFPS were obtained, diluted with deionized water, mixed, and the liquid fraction extracted using a pilot screen of the same material as the RSTs. Analyses of these samples showed VFA concentrations as high as those of the filtrate already being delivered to treatment. As a result, a two stage extraction pilot test was initiated. FPS was pumped through an RST, in which first stage extraction took place. It then discharged into a hopper along with dilution water. The contents of this hopper were pumped to a second RST in which second stage extraction took place. Testing of the filtrate from prior to and during the two stage extraction pilot showed an increase in VFA extraction of 677 pounds per day, a 48.5% increase. After the two stage extraction pilot, effluent dissolved reactive phosphorus from the best performing aeration basin fell by 70%. Plant effluent dissolved reactive phosphorus fell by 10%.

Brief Biography and/or Qualifications
30 W HAVASU FALLS ST - MERIDIAN, ID 83646 - Phone: (503)367-3033 - Email:

CITY OF BOISE Boise, Idaho
Wastewater Operator II May, 2016 – Present
•Monitored, adjusted, maintained, and analyzed complex wastewater treatment processes.
•Performed sample collection, laboratory testing, and process profiling.
•Reviewed laboratory and statistical data to make process recommendations.
•Assisted with special projects such as stress, pilot, and optimization testing of equipment and processes.
•Provided training and observation of new wastewater operators.

CITY OF BOISE Boise, Idaho
Wastewater Operator I March, 2015 - May, 2016
•Maintained and operated wastewater plant equipment and processes.
•Sampled and analyzed influents and effluents as prescribed by analytical procedures.
•Recorded and analyzed test results and other pertinent data to identify variations.
•Maintained accurate records of process and lab results.

Microbial Source Tracking Intern June, 2014 - September, 2014
•Performed field analysis of water samples for chemical and biological contaminants.
•Performed advanced microbiological assays to classify bacterial contaminants in surface water.
•Wrote SOP for human bacteriodetes and enterococci real-time PCR.
•Translated complex scientific information into plain language for blog posts.

Wastewater Treatment Plant Operations Intern April, 2014 - May, 2014
•Collected and ran permit and process control tests on wastewater and solids samples.
•Maintained wastewater treatment plant structures and equipment.
•Assisted in plant equipment operation and process control.

Learning Support Specialist January, 2014 - June, 2014
•Tutored students in water treatment, wastewater treatment, chemistry, biology, microbiology, and math.
•Assisted faculty in improving course materials for better student outcomes.
•Created and modified homework problems sets and assisted faculty in creating exams.
•Substitute taught environmental chemistry lab.

PORTLAND STATE UNIVERSITY Completion Date Bachelor of Science, summa cum laude, Environmental Science June, 2013


4:30pm - 5:15pm
ID: 195 / Session 08B: 3
Main Technical Program
Topics: EBNR, nitrogen and phosphorus management
Keywords: VFA, fermentation, lab testing

Heating Primary Sludge for Increased Volatile Fatty Acid Fermentation

Jana Otero, Adrienne Menniti, Peter Schauer

Clean Water Services, United States of America;

The Durham Advanced Wastewater Treatment Facility has been practicing biological phosphorus removal (BPR) for over two decades. The facility relies on a primary sludge Unified Fermentation and Thickening (UFAT) process to augment the influent Volatile Fatty Acids (VFA) and support BPR. The process currently needs to be expanded because the solid residence time (SRT) available is too low to provide adequate VFA production when wastewater temperatures are low. A capital improvement project to expand the UFAT process is scheduled for completion in 2022. As an interim solution, primary sludge heating is being installed to increase VFA production.

Preliminary bench-scale testing will develop the start-up and operational plan for the full scale heating. Two temperature controlled jacketed reactors will be used to operate continuous flow, bench-scale fermentation at temperatures ranging from 15-30 deg C and SRT ranging from 1-5 days. Testing for each condition will be conducted for longer than three SRT to reach steady state operation. Influent primary sludge TS, reactor pH, soluble VFA concentration, and effluent TS will be monitored.

Year-round operational data already shows that increasing the primary sludge temperature from 15 to 20 degrees C almost doubles the VFA produced. Heating the primary sludge should stabilize VFA production throughout the year and promote more stable BPR. This is exceptionally important in the early months of the summer permit season when BPR is highly VFA deficient.

This presentation will review the full-scale operational data that supports the potential benefit for heating the unit process, the bench-scale testing results, and the implications the heating project has on the overall facility expansion. The following key questions will be addressed:

• What SRT and temperature combination produces the most stable performance for VFA production?

• With sludge heating, what design SRT should be used for fermentation capital expansion design criteria?

Brief Biography and/or Qualifications
Jana Otero is an Operations Specialist in the Technology Development & Research group for Clean Water Services. She received her bachelor’s degree in Environmental Engineering from Oregon State University. Jana graduated with summa cum laude honors.

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