Presentations by Greg Wetterau, PE, BCEE
Matches: 16
Overview of Concentrate Management Options
The PowerPoint presentation reviews concentrate disposal methods for reverse osmosis facilities in the United States...
Breaking New Ground in California's Seawater Desalination: The Sand City Story
This presentation describes a city's goal of implementing a desalination project supplied by beach wells to facilitate city-wide redevelopment. Significant measures were taken to reduce both capital and operating costs through energy recovery, high efficiency pumps, and off-peak operation. By utilizing this design approach, and making use of a 50% ...
Eliminating Second Stage UF in the Country's Largest Zero Liquid Discharge Membrane Treatment Facility
This paper describes the pilot testing and retrofit of a CA UF drinking facility treating a degraded quality surface water which operates with ZLD. Challenges encountered during the project include: permtting, deteriorating source water quality and continued operations. Final design eliminates one stage, decreases flux by 15% and reduces energy a...
Impact of Source Water on Indirect Potable Reuse - Is More Pretreatment Always Better?
This paper evaluates the use of secondary versus tertiary water for sourcewater ro indirect potable reuse. The addition of Mannich polymer for tertiary treatment results in increased NDMA formation. Ths paper compares the operation of the unit processes for the indirect potable reuse on both source waters. The source water and product water quali...
Design-Build: An Engineer's Perspective
This presentation discusses project delivery methods and compares the design-build approach with the design-bid-build and construction manager at-risk methods. The comparison includes data on relative unit cost, construction speed, delivery speed, and schedule growth. Types of design-build arrangements are also discussed including prescriptive bids...
MF/UF Water Quality, Performance, and Applications
This presentation covers MF/UF water quality, performance, and applications. It provides an overview of the basic principles of membrane filtration, typical MF/UF treatment objectives and elaborates on the differences between pressurized and submerged systems....
How to Choose RO Membranes for IPR
Study compares advanced treatment pilot testing results aimed at reducing maintenance costs while also improving contaminate rejection in application of indirect and direct potable water reuse. Evaluation focuses on failing rate, salt passage and reduction of contaminants of emerging concern. Reverse Osmosis membranes from three manufacturers were ...
Process Optimization for the San Diego IPR Demonstration Plant
This paper will compare operating results from the membrane filtration and RO systems applied for indirect potable reuse (IPR), comparing each system configuration and membrane type based on fouling rates, product water quality, and energy usage. These results will also be compared against available operating information from full-scale facilities...
Addressing Start-Up Challenges With An In-Line Filtration Facility
This paper discusses the use of in-line filtration with ultrafiltration (UF) membranes for disinfection by-product (DBP) precursor reduction, the challenges experienced during start-up of the facility, and the measures taken to address these challenges. The paper also demonstrates that while the membrane processes are often the focus of membrane f...
15,000 hours of Membrane Operational Experience: City of San Diego Advanced Water Purification Facility
Data generated from the City of San Diego Advanced Water Purification (AWP) demonstration project was used to support the City?s proposal for conditional regulatory approval and estimate of capital, operational and maintenance (O&M) costs of a potential full-scale project. The potential full-scale project would purify tertiary effluent from North C...
Overcoming Obstacles to Create an Emergency Water Supply in California?s Water Crisis
Saga of the Cambria Community Service District starting in 1987 to develop a seawater desalination system stymied by the California Coastal Commission was abandon after a tumultuous period of opposition from vocal community groups and regulatory agencies due to enviornmental concerns. Modifications resulted in an Advance Water Treatment Project (A...
Implementing Universal UF Systems - Separating Truth From Fiction
This paper looks at four separate membrane filtration facilities where universal or semi-universal membrane skids have been incorporated, comparing design approaches, contracting approaches and plant operation with comparable facilities using proprietary membrane filtration systems. The paper also discusses the impact on construction at one facilit...
EPA Regulations on Reuse
The Guidelines for Water Reuse published by the United States Environmental Protection Agency (EPA) in 2012 facilitates development of water reuse by serving as an authoritative reference. The document covers both non-potable and potable reuse, but does not provide detailed information on current direct potable reuse practices. A challenge in imple...
Expanding Reuse for Carlsbad, California, Using Membrane Technologies
The City of Carlsbad installed a 3.4 mgd UF facility to expand the reuse from the adjacent Encina Water Reclamation Facility. Water quality from the upstream wastewater plant resulted in various operational challenges during initial plant start-up. The plant operators and design-build team were able to adjust maintenance cleaning approaches and rep...
Regulations for Wastewater Reuse
The Guidelines for Water Reuse published by the USEPA have served as an authoritative nationalwide reference in the support of state specific regulations. The document covers both non-potable and potable reuse, and was supplemented in 2017 with a Potable Reuse Compendium, focusing on key issues with the implementation of potable reuse. This present...
Potable Reuse Side-by-Side Pilot Testing - O3-BAF vs. UF-RO on Two Different Source Waters
JEA recently completed Phase I of a 3-Phase plan to test and implement a potable reuse project. Phase I was a pilot-scale evaluation of alternative treatment trains (O3-BAF vs. UF/RO) on two significantly different source waters (residential vs. industrial/residential). This paper and presentation will present the approach and operating protocol us...