The State of the Practice of Class-A Anaerobic Digestion: Update for 2005
Since the 40 CFR, Part 503 regulations were promulgated in 1993, utilities and engineers have considered thermophilic anaerobic digestion configurations…
The Role of Glutathione Mediated Oxidative Stress Response Mechanisms in Nitrifying Bacteria.
Nitrification in activated sludge is especially susceptible to oxidative chemical toxins. Several oxidative stress response mechanisms exist in bacteria, and…
The Port of San Diego Applies Information Technology to Storm Water Compliance, A Case Study.
In 2001, the San Diego Unified Port District (Port) became one of 20 “Co-permittees” on the new Regional Storm Water…
The Operational Envelope Concept, and Eckenfelder Advance Sludge Model Used for Cod Removal Design
The operating envelope concept is applied as an activated sludge design tool. Based on chemical oxygen demand (COD) removal kinetics,…
The Impact of Floc Metals on Conventional and Enhanced Mesophilic Anerobic Digestion Technologies
In this investigation the impact of floc associated cations on enhanced anaerobic digestion, and the enhancement of anaerobic digestion using…
The Emotional Stages of Becoming Competitive: Individuals and Workgroups
The era of competitiveness that is upon our profession is a normal process of organizational renewal. Determining how to be…
The conversation the Consulting Engineer and the Utility Manager Ought to Have: What Does Getting More for Less Mean?
In an era of greater expectations from the public for greater efficiency in utility operations, managers are examining all aspects…
Sustainable I/I Reduction: Planning Level Cost Estimation Using a Performance-Based Cost Function
The cost of sustainable infiltration and inflow (I/I) reduction is dependent on the sources of I/I and the methods used…
Sustainability: Opportunities at Your Facility to Think Globally and Act Locally
All over the world, people are re-evaluating the old ways of “doing business,” in favor of longer-range planning. This is…
Sustainability, One
As a utility in one of the fastest-growing regions of Puget Sound, the LOTT (cities of Lacey, Olympia, and Tumwater;…
Study of Raw Wastewater BOD5 and cBOD5 Relationship Yields Surprising Results
A study of the relationship of the raw wastewater BOD5:cBOD5 ratio was conducted at three wastewater treatment plants across the…
So, You Decided to Build an MBR? Tips to help optimize process performance.
Tips to help optimize process performance. Membrane bioreactors (MBRs) are a viable treatment alternative when a wastewater utility has footprint…