Review of Folklore in Design and Operation of Secondary Clarifiers
Dick published a classic paper in the mid-1970s illuminating popular final settling tank beliefs as folklore with little factual or…
Ten Years of Experience with Classifying Selectors for Activated Sludge Foam Control in the USA
Classifying selectors are used to control the population of foam causing organisms in activated sludge plants to present the development…
Review of Two Decades of Experience with TF/SC Process
The trickling filter solids contact (TF/SC) process is now over 20 years old, having been first demonstrated successfully in 1979…
Evaluating Secondary Clarifier Performance and Capacity
The secondary clarifier plays a critical role in the success of the activated sludge wastewater treatment process by producing the…
Foam on the Range: Learn how a Texas facility lassoed Nocardia foaming during an air activated sludge upgrade (original paper: Overcoming Difficulties Converting from Pure-Oxygen to Air Activated Sludge at El Paso, TX – Haskell R. Street Wastewater Treat
Learn how a Texas facility lassoed Nocardia foaming during an air activated sludge upgrade.
First of Its Kind Industrial Wastewater Permitting of a Hospital Complex
For the first time in Sacramento County, the Regional County Sanitation District required a hospital complex to be permitted as…
Modeling of Volatile Organic Contaminants in Trickling Filter Systems
Despite the widespread use of trickling filters, there has been minimal investigation of the fate of volatile organic contaminants (VOCs)…
Case Histories of Sulfide Corrosion
Section 522 of the Water Quality Act of 1987 requires the U.S. Environmental Protection Agency (EPA) to conduct a study…
Biological Treatment of Odorous Airstreams
Biological treatment of odorous airstreams at wastewater treatment plants is being implemented more frequently in recent years largely because of…
Monofills and Surface Disposal of Sludges
Sludge disposal methods take many forms. This paper describes sludge-only land disposal methods, their primary features, and typical current requirements…
Abandon with Care: Proper Well Closure at Hazardous Waste Sites Is Necessary to Prevent Cross Contamination
Properly abandoning unused wells is important to eliminate the physical hazard of an open well and to preserve the water…
Measuring the Effectiveness of NPDES Stormwater Programs: Sacramento’s Approach
In 1990, the Sacramento County Water Agency and the cities of Sacramento, Folsom, and Galt (see Figure 1) applied for…