Relationship Between Activated Sludge Flocculation Characteristics and Cell-Surface Polysaccharide Concentration
The success of gravity separation of activated sludge from a treated effluent is absolutely dependent of the flocculent nature of…
An Innovative Design for Self-Cleaning Wet Wells for Constant Apeed Pumping Stations
Modeling studies at hydraulics laboratories at Montana State University and ENSR Consulting and Engineering have confirmed the validity of an…
Tracking Ever-Shrinking Emissions
The measurement of plant emissions is entering a new phase. The driving force ¾ at least in the U.S. ¾…
Pilot-Scale Evaluation of Physical-Chemical Treatment of Secondary Effluent
The City of Phoenix (City) has negotiated a water exchange with the Roosevelt Irrigation District (RID). In the exchange, the…
Metro Seattle Renton Treatment Plant Sludge Thickening Update
The Municipality of Metropolitan Seattle’s (Metro) Regional Treatment Plant in Renton, Washington (MTPR) was initially constructed in the early 1960s…
Design-to-Cost with BACPAC
In this paper we will compare the shortcomings of the traditional approach to management structures and cost estimating with BC’s…
Kachina Village Wetlands-A Success Story in Zero Discharge
In 1985, Kachina Village Improvement District (KVID) faced a very difficult situation in wastewater management. Its treatment plant was providing…
Full-Scale Performance of Nitrifying Trickling Filters
Interest in the nitrifying trickling filter (NTF) process has been increasing in recent years as many wastewater treatment agencies, both…
Removal of Selenium Using a Novel Algal-Bacterial Process
A process for removing selenium and nitrate from agricultural drainage water using algae and anaerobic bacteria was studied in a…
A Debate: Circular Clarifiers or Rectangular Clarifers – “Rectangular Clarifiers Should Be Considered” and Rebuttal to “Rectangular Clarifiers Should Be Considered” and “The Case for Circular Clarifiers” and Rebuttal to “The Case for Circular Clarifiers”
In recent years a number of designers seem to have eliminated rectangular clarifiers form their design repertoires. Many others never…
Floc Breakup in Activated Sludge Plants
This investigation, conducted at 24 full-scale activated sludge wastewater treatment plants, quantified the extent of floc breakup resulting from the…
Setting Standards in San Diego
Most engineering firms have developed specifications and standards that become the bible for project-related design issues–and no two firms are…