Innovative Pumping Station Design
In 1961, the Municipality of Metropolitan Seattle (Metro) started construction of its Stage 1 program–building the backbone of a sewage…
Nitrification for the ’90’s
Ammonia removal ranks as a major new issue for many wastewater treatment managers particularly those whose plants discharge into warm-water…
Scale-up Programs in Aerated Lagoon Process Design
Bench-scale testing of completely mixed aerated lagoon systems has been shown to simulate full-scale systems poorly in both municipal and…
Pilot Plant Comparison of Extended Aeration and PACT* for Toxicity Reduction in Refinery Wastewater
During the 1970s, water pollution regulations focused primarily on controlling conventional pollutants – oxygen-demanding materials, heat, and suspended solids. These…
Conserving Water Through Residential Water Audit and Leak Detection Programs
The Metropolitan Water District of Southern California had three residential water conservation programs developed and pilot tested in its service…
Cyanide Control in Petroleum Refineries
Refinery managers and operators have known that cyanide is present in petroleum refinery effluent for a number years.1,2 Cyanide levels…
Meeting Stringent Metals Removal Requirements With Iron Adsorption/Coprecipitation
The Water Quality Act of 1987 set the stage for establishing a far more stringent set of metals-removal discharge requirements…
Recovery and Recycling of Spent Acids in the Metals Processing Industry
Many companies generate large amounts of concentrated acid wastes. Facilities which process metals are very concerned about this problem. A…
Chevron Process Reduces FCC/Coker Corrosion and Saves Energy
The Chevron Polysulfide process has been installed in fluid catalytic cracking (FCC) and coker fractionation systems at six Chevron refineries…
Cost-Benefit Analysis of Conservation Programs
A carefully planned and implemented conservation program can reduce water consumption by 10-30 percent. This reduction will help meet demand,…
Remedial Alternatives for Removing DBCP and Other Pesticides From Groundwater
Contamination of water supplies by pesticides (or herbicides) is a significant public health problem because of the widespread application of…
Trickling Filter/Solids Contact Process Married to Lagoons–A Unique Process Combination at Everett, Washington
The City of Everett, Washington, located in Snohomish County, presently treats wastewater for a community of approximately 77,000 people. Maximum…