Using High-rate Clarification Processes to Optimize Water Treatment
Federal and state drinking water regulations, such as the Long Term 1 Enhanced Surface Water Treatment Rule (LTlESWTR) and the…
Shifting the Paradigm: Anaerobic Digestion and Combined Heat and Power for Small Treatment Plants
Many wastewater treatment facilities face the challenges of high energy costs and limited options for biosolids use and disposal. While…
How Much Capacity Does It Really Have? Researchers Determine Which Secondary Clarifier Model Is More Useful.
Staff at activated sludge treatment plants with sedimentation need to know exactly how much capacity their secondary clarifiers have. Knowing…
Good Things from Small Packages.
Water reuse does not have to be an all-or-nothing proposition. Even small-scale projects can have notable effects on potable water…
*Better Treatment Focusing on SRT Not Solids Inventory”
The activated sludge process is widely used because of its performance, versatility, and controllability. Unfortunately, its controllability also may be…
Hilo Bay Mixing Zone Study and Dilution Modeling
Working for the County of Hawaii, Brown and Caldwell conducted the Hilo Bay outfall mixing zone field study on May…
WEF/WERF Cooperative Study of BNR Plants Approaching the Limit of Technology: II. Statistical Evaluation of Process Reliability
The Water Environment Federation (WEF) and the Water Environment Research Foundation (WERF) cooperated in a comprehensive study of nutrient removal…
WEF/WERF Cooperative Study of BNR Plants Approaching the Limit of Technology:
The Water Environment Federation (WEF) and the Water Environment Research Foundation (WERF) cooperated in a comprehensive study of nutrient removal…
What is the Limit of Technology (LOT)? A Rational and Quantitative Approach
What is the Limit of Technology (LOT)? This question has been raised and answered by regulators, designers, operators, researchers and…
Thirty-six Years after the Clean Water Act * Time for a New Regulatory Framework
The Secondary Treatment Regulation that establishes technology-based limits for BOD5, cBOD5, and total suspended solids is no longer relevant to…
The Impact of Internal Recycles on the Nitrifier Maximum Growth Rate
The nitrifier growth rate constant, µA,max, is a critical parameter for design and performance of nitrifying activated sludge systems. Although…
The Application of PAX Compounds for Microthrix Parvicella Foam Control in BNR Systems
Case histories are presented for two BNR plants that have experienced long term Microthrix parvicella induced foaming and poor settling….