Potentially Required Equipment for Industrial NPDES Permitting

This webpage summarizes potential equipment requirement of the NPDES permit process. This webpage in not all inclusive but will be added to in the future.

Screens for Potential Seafood and Other Industrial Processing Effluent
In many cases, "mesh screens" are typically called out in NPDES permits for physical treatment of seafood and other industrial processing wastewater effluent. However, physical screen dimensions are typically not provided in most NPDES permits. Accordingly, we link to Screen Technology Group, Inc.'s mill grade screen cloth table to provide these specifications. The screen cloth table provides physical dimensions versus specific mesh screen designations.

The EPA provides some specifications and drawings for fish processing screens in Development Document for Effluent Limitations Guidelines and New Source Performance Standards for the Fish Meal, Salmon, Bottom Fish, Clam, Oyster, Sardine, Scallop, Herring, and Abalone Segment of the Canned and Preserved Fish and Seafood Processing Industry Point Source Category: Group 1, Phase II (September 1975). See Key Industry Development Documents for obtaining this document. A rotary screen and a tangential screen (hydrosieve) are drawn in the EPA document. The full EPA discussion for effluent screens for seafood processing effluent can be viewed in the development document subsection (pp. 330-342) at End-of-Pipe Control Techniques and Processes.

Additional information on rotary and hydrosieve screens can be obtained from manufacturer websites for seafood and other industrial process effluents. For example, but not limited to, IPEC Consultants Ltd. has photographs, descriptions and specifications for rotary screens and static sidehill screens (hydrosieves).