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 02A: Wastewater 101: Preliminary Treatment
Monday, 09/Sep/2019:
9:45am - 12:00pm

Session Chair: Jim Wodrich, HDR;
Location: D135

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9:45am - 10:30am

Wastewater 101: System Curve Development and Pump Selection

Eddie Kreipe, Freeda Crow

Murraysmith, United States of America; ,

Design guidelines and best practices for developing pump station system curves and pump selection will be presented. This will include an overview of components making up total dynamic head and discussion on factors that can influence the results. In addition, best practices for pump selection of constant speed and variable speeds wastewater pumps will be presented along with case studies of various project examples and lessons learned.

Attendees will gain an understanding for the fundamental of system curve development, reviewing pump curves, applying affinity laws to variable speed pumps, and tip for pump selection.

10:30am - 11:15am

Screen Time: Considerations for Headworks Screening

Tom Giese

BHC Consultants, United States of America;

As one of the first processes at any wastewater treatment plant, screening can be critical to the function and performance of many downstream processes. This presentation will focus on important considerations to ensure that the screening process is meeting the needs of the application, such as:

· Screenings volume and characteristics

· Physical constraints

· Hydraulics – Flows, velocity and upstream/downstream water levels

· Screening element – Capture, capacity, carryover, cleaning and blinding

· Staged screening, redundancy and overflows/bypasses

· Maintenance access – Isolation, drains, space/location

· Controls and integration

· Rocks and grit

· Environment – Area classification, odors and weather exposure

· Washer/compactors

· Screenings conveyance and storage/disposal

· Support systems – Water and power

Examples of actual installations and designs will be referenced throughout the presentation to demonstrate how these considerations are translated into real world applications.

11:15am - 12:00pm

Relative Performance of Grit Removal Systems

Patrick Herrick

Hydro International;

Biological processes continue to evolve toward better effluent quality in a smaller footprint. The fact that these processes are many times housed in a small footprint means that they have an inherent inability to store grit and debris. This, in conjunction with the trend towards reductions in plant personnel, drives the need for advanced headworks processes that are more effective at removing grit and debris. Screening, for example, has trended toward progressively smaller openings with 1/4” screens commonly used. Improved grit removal system performance is critical to successful plant operations. Similar to screening, the trend here is to target smaller particles to increase the system overall removal efficiency.

Choosing a grit removal technology has often been based on equipment price with little regard for device efficacy and consequent grit removal efficiency. Owners and engineers are forced to navigate a field of what can be conflicting performance claims made by various equipment manufacturers. This situation is perpetuated by the fact that there is no widely accepted, peer reviewed test standard for grit sampling and analysis.

The purpose of this paper is to encapsulate various grit removal system performance data generated by a repeatable sampling and analysis methodology for the purpose of comparing virtually all grit removal technologies in terms of their effectiveness. A side-by-side comparison now offers decision makers the data needed to make an educated decision when selecting a grit removal technology.

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