February 2010, Vol. 22, No. 2

Step 1: Dewatering

A Florida utility determines which technology would best fit its biosolids master plan 

Feature 1 Anipitakis George P. Anipsitakis, Michael R. Leffler, J. Richard Voorhees, Robert J. Leacock, Edward B. Scott, Rick Nipper, and Quyen M. Newell

In anticipation of significant growth in its service area, the Tohopekaliga Water Authority (TWA; Kissimmee, Fla.) needed a master plan for its biosolids. This plan should outline an effective biosolids management strategy based on recent technical advances, scientific research, evolving federal and state legislation, and community expectations. Read full article (login required)


Treat It or Move It

Virginia facility upgrade must meet exceptionally low limits while collecting wastewater from a currently underserved area

Feature 2 Schnekelberg Kraig Schenkelberg and Bryan Horton

Onancock, Va.’s new National Pollutant Discharge Elimination System permit included “limit of technology” effluent standards dictated by Virginia’s Chesapeake Bay Program. By Dec. 31, 2010, the treatment plant’s effluent could not contain more than 4 mg/L of total nitrogen and 0.3 mg/L of total phosphorus. The town also had to cut effluent biochemical oxygen demand (BOD) and total suspended solids (TSS) levels to less than 3.33 mg/L or else relocate its outfall before the deadline. As if that wasn’t enough, Onancock had to rehabilitate and expand its 30-year-old treatment plant to meet both the current capacity concerns and future needs of an area without sanitary sewer service.

It was time for a new treatment approach. Read full article (login required)


Changes Ahead

Water management professionals should account for climate change when working with TMDLs

Feature 3 Zhang Harry X. Zhang

Little research has been done on how climate change could affect ambient water quality and total maximum daily loads (TMDLs). This article provides a review of existing studies and suggestions on adapting a few key TMDL issues to ensure that this water quality management tool remains effective in a changing climate. Read full article (login required)


Operations Forum Features

Virtual Knowledge

Cost-effective training of wastewater treatment plant operators with models

Feature 4 model training Spencer Snowling, Oliver Schraa, Rajeev Goel, Hank Andres, and Bruce Tole

Simulation-based tools for operator training are gaining popularity as a way to capture plant-specific knowledge and then allow new staff to experience a wide range of plant behaviors cost-effectively. While these tools primarily address technical knowledge transfer only (as opposed to social and structural knowledge), they can be customized to provide a comfortable learning environment that enables users to interact with models in an intuitive way. Read full article (login required)


Debating Dewatering

What to factor in when choosing equipment

Feature 5 dewatering Jim Bishop

Wastewater treatment plant operators know that managing the treatment process is a balancing act. Every component is related to all the others, so selecting the appropriate dewatering technology is critical to system performance.

This article gives a brief overview of how several dewatering technologies work as well as their pros and cons. Read full article (login required)


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