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The overall aim of this research was to evaluate membrane bioreactor (MBR) process designs to meet low effluent nitrogen and/or phosphorus concentrations from municipal wastewater treatment plants (WWTPs) and to identify design and operating issues that are unique to the application of MBR technology for achieving a high level of nutrient removal, such as effluent concentrations for total nitrogen (TN) below 3 to 6 mg/L and for total phosphorus (TP) below 0.1 to 1.0 mg/L. The application of membrane bioreactors has increased rapidly over the past two decades, expanding knowledge and experience with the technology. Textbooks and other publications are available that provide fundamental information on membrane separation, terminology specific to MBRs, as well as information on the process and detailed design of MBR systems. The fundamentals and design considerations of biological nutrient removal systems have also been documented. This document does not provide the above mentioned details on the MBR technology or nutrient removal, and the reader is referred to the texts below for such information. However, key definitions of process terminology are defined where it is important to provide clarity for the reader.
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Solids Role in Tertiary Chemical Phosphorus Removal by Alum
The need to control and remove phosphorus (P) in discharges from wastewater treatment facilities (WWTF) to prevent eutrophication of receiving waters is well known. Regulatory initiatives are...
Low Phosphorus Analytical Measurement Study
Phosphorus measurements at very low concentrations have been tested and proven to be unreliable. The establishment of stricter phosphorus discharge requirements has challenged the wastewater...
Factors Influencing the Reliability of Enhanced Biological Phosphorus Removal
Enhanced biological phosphorus removal (EBPR) has been used for decades to remove phosphorus from municipal wastewater because it allows facilities to meet water quality goals while minimizing...
Application of a Dynamic Model to Assess Microbial Health Risks Associated with Beneficial Uses of Biosolids
Microbial risk assessment is a structured approach to estimating risks associated with environmental exposure to pathogens by using available environmental data.
In this report the...
Accounting for Toxicity Test Variability in Evaluating WET Test Results
Characterizes sources of WET test variability and evaluates existing and new methods that integrate variability into decision making. Will identify technically defensible methods to improve the...
Decision Analysis and Implementation Guidance in Strategic Asset Management
Track 3 of WERF’s Strategic Asset Management Project was developed to “provide guidance on implementing SAM…and develop analytic tools for SAM implementation” - the Decision Support Tools and...
Identification of Barriers to Energy Efficiency and Solutions to Promote These Practices
Successful deployment of energy efficiency initiatives may be increased by recognizing barriers and advancing strategies that overcome them. A national survey recently collected input on barriers...
Nitrification
Over the past 15 years, the use of modern molecular biological approaches has radically advanced our understanding of nitrification processes. With chapters contributed by leading experts in the...
Collection System Ventilation
This report presents the methodology and findings of the Collection System Ventilation Research project completed in Phase II of the WERF initiative Minimizations of Odors and Corrosion in...
Technology Roadmap for Sustainable Wastewater Treatment Plants in a Carbon-Constrained World
Resources end up in wastewater through inefficient consumption. As a result, wastewater contains reusable water, carbon (energy) and nutrients (nitrogen, phosphorus and sulfur) that could be...
Adapting Leading Practices and Associated Tools
The purpose of the demonstration of WERF Strategic Asset management (SAM) decision support tools is to provide users with insight into the efforts and impacts of applying the various asset...