Evans, Eric

Eric Evans is a Senior Process Engineer at HDR. His work ranges from nutrient removal to solids processing using the latest tools and innovative...

Joined:

About Evans, Eric

Eric Evans is a Senior Process Engineer at HDR. His work ranges from nutrient removal to solids processing using the latest tools and innovative technologies. Eric works as hard as he can to "break" things in testing and design so that we have confidence that it will work when installed! Eric's PhD is from Iowa State University is in Environmental Engineering.

Evans, Eric

Titles from this speaker

Optimization Strategies: BOD to P (Des Moines Case Study)

Abstract

The Des Moines WRA’s nitrification activated sludge process has been previously optimized for energy efficiency by reducing airflow with staggered dissolved oxygen (DO) concentrations in passes one through four of their six-basin process. A second optimization step to provide enhanced biological phosphorus removal (EBPR) has been tested by decreasing and cycling air flow in the first pass to achieve anoxic/anaerobic conditions with DO concentrations measuring less than 0.1 mg/L and average oxidation reduction potential (ORP) concentration of about -130 mV. EBPR activity was successfully established in the modified basins with average phosphorus mass content of the waste sludge 3.2 ± 0.2% (95% confidence) compared to 1.6 ± 0.1% in the control basin. A wet weather scenario was also tested by operating in contact stabilization mode in order to protect the first pass from high DO entrained influent waste streams. Results showed effluent phosphorus concentrations less than 1 mg-P/L could be achieved and operation in contact stabilization mode provided some protection to the first pass.

SpeakerEvans, Eric

Presentation time

10:35:00

10:50:00

Session time

08:30:00

12:00:00

SessionStrategies to Optimize WRRFs for Nutrient Removal

Session number510

TopicNutrients, Research and Innovation

Author(s)

E.A. EvansE.A. Evans

Author(s)E.A. Evans1; E.A. Evans1;

Author affiliation(s)HDR, IA1

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2020

DOI10.2175/193864718825157510

Volume / Issue

Content sourceWEFTEC

Word count10

Base text size -

Evans, Eric

About Evans, Eric

My Recent Activity