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…
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…
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…
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…
Minimizing the Impact of Nitrification in the BOD5 Test
Are your effluent BOD5 results significantly higher than your suspended solids results? Are you having trouble meeting your BOD5 permit…
Petroleum Effluent Toxicity Reduction–From Pilot to Full-Scale Plant
A petroleum refining complex was required to upgrade its wastewater treatment system to meet newly adopted toxicity requirements and to…
Designing Treatment Systems to Accommodate Process Variability
Effluent variability is one of the factors considered by industrial and municipal dischargers in setting wastewater treatment facility design goals….
Trenchless Techniques Improve Pipelines
The realization that an existing, deteriorated pipe is a valuable asset that can be restored has led to the rapid…
Interesting Discoveries with a Low-Tech Sludge Lagooning and Air Drying Operation
In 1989, the Metropolitan Wastewater Management Commission (MWMC) of Eugene/Springfield, Oregon, put their new sledge management facilities into operation. Designed…
Wastewater Treatment Process Theory and Practice: The Emerging Convergence
The state of development of process modeling is assessed from the practitioner’s point of view. The history of model development…
Closure of Hazardous Waste Sites Utilizing On-Site Encapsulation
On-site encapsulation is a technique that has been used for centuries as a method for managing and disposing of both…
Discussion of: Nitrification Performance of a Pilot Scale Trickling Filter
There have been several extensive studies during the past few years to establish general design criteria of nitrifying trickling filters…