What Is API 421 and Why Does It Matter?
API 421, formally titled “Management of Water Discharges: Design and Operation of Oil-Water Separators,” is the industry’s primary reference for sizing and designing gravity-based oil-water
Engineering guidance, compliance insights, and real-world solutions for managing oily wastewater in industrial and utility environments.
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Practical knowledge, technical guidance, and real-world case insights from Mercer engineers and separation specialists.
API 421, formally titled “Management of Water Discharges: Design and Operation of Oil-Water Separators,” is the industry’s primary reference for sizing and designing gravity-based oil-water
Not all oils behave the same in water, and understanding the differences is crucial for choosing the right separation technology. Oils in wastewater are generally
An oil-water separator is a wastewater treatment device designed to remove oils, greases, hydrocarbons, and settleable solids from contaminated water. While all separators rely on