Physical Treatment Technologies: Filtration
Filtration is one of the most common techniques for physical separation, and is used to remove solids from both gaseous and liquid streams. It is frequently used in the treatment of waste water.
Physical Treatment Technologies: Flocculation
The use of gravity is often the most economical method of separating solids from a liquid. In a sedimentation tank, heavier particles sink to the bottom and are collected in a trough. When particles, like clay, are too..
Physical Treatment Technologies: Microfiltration and Reverse Osmosis
Microfiltration and reverse osmosis are barrier filters that have the smallest pore sizes utilized. These techniques are heavily dependant on supplementary pressure to force the waste stream across the barrier. After t..
Physical Treatment Technologies: Physical Treatment Processes
Physical treatment technologies often provide the initial and most efficient form of treatment, but do not actually transform or destroy the waste. Physical treatment processes often rely on natural forces to do the wor..
Physical Treatment Technologies: Vapor Pressure: Evaporation Ponds, Air Stripping and Distillation
The physical property known as vapor pressure is the tendency of a material, at a given temperature, to turn into a gas. Substances with a higher vapor pressure will change into a gas more quickly than substances with a..
Physical Treatment Technologies: Waste and Emissions Standards
In the past, when the waste load was light, nature's ways of purifying itself were sufficient. However, the amount of waste generated by contemporary society has overburdened these restorative powers. As a result, regu..
Pollution Prevention: Bridging Troubled Water: Alternative Pulp and Paper Bleaching Technology
Facing a lawsuit charging it with discharging toxic effluent in the water off the coast of northern California, Louisiana Pacific knew it needed to change the way its pulp mills operated. Even though it successfully met..
Pollution Prevention: Bridging Troubled Water: Pollution Prevention: Past, Present and Future
In terms of measurable impact and effectiveness, the federal Clean Water Act has been the most successful piece of environmental legislation in U.S. history. For companies thinking of investing in pollution prevention, ..
Pollution Prevention: Bridging Troubled Water: Pulp and Paper Industry Regulations
The transformation of wood or other raw materials into pulp through chemical or mechanical processes is a water intensive process that creates large residues of waste materials. However, prior to the 1970's, the pulp and..
Pollution Prevention: Bridging Troubled Water: The Screen Printing Industry
Screen printing, the process that creates T-shirt art and signage, can produce waste streams that are harmful to water quality. In the past, many solvents used to clean and reclaim screens were simply washed down the dr..