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U.S. EPA MP&M Proposed Rule




Our office, the Ohio EPA, Office of Pollution Prevention (OPP) has just created a website to provide information to Ohio facilities on U.S. EPA's proposed Metal Products and Machinery (MP&M) Effluent Guidelines.  Pollution Prevention (P2) is an important component of the proposed rule

OPP's MP&M website is at: http://www.epa.state.oh.us/opp/mpm.html 

On OPP's website, you will find the following infromation:

MP&M Background Information 
Coverage/Categories and Subcategories 
Flow Exemptions 
Special Requirements 
MP&M Effluent Limits 
P2 Compliance Alternative and other MP&M P2 Information 
               

Read on for more MP&M details -

On January 3, 2001 U.S. EPA proposed a new effluent (wastewater) rule for Metal Products and Machinery (MP&M) facilities. This regulation, when finalized, will establish pretreatment standards for effluent limitations for
wastewater discharged into Publicly Owned Treatment Works (POTWs).  

U.S. EPA originally proposed MP&M rule making (Phase I) May 30, 1995. Due to comments received, U.S.
U.S. EPA decided to combine Phase 1 and Phase II into one regulation which would cover all the industrial
sectors in the MP&M industry. The data used in developing the 1995 Phase I proposal was combined with
the Phase II data for January 3, 2001 proposal.  

The MP&M rule will cover facilities that manufacture, rebuild and maintain metal parts, products, or
machines.  U.S. EPA estimates there are approximately 63,000 MP&M facilities. About 93% are "indirect
discharges" sending process wastewater to POTWs.  

Pollution Prevention used In MP&M 

Pollution prevention (P2) is an important component of the Metal Products & Machinery (MP&M) rule. The
technology options used in developing the effluent limitations include both pollution prevention (source
reduction and recycling) and wastewater treatment.  P2 is the use of source reduction and recycling
techniques. P2 has been demonstrated by MP&M facilities to both reduce the discharge of pollutants and to
reduce operating costs.  For many MP&M facilities, compliance strategies based on pollution prevention will
be more cost-effective than wastewater treatment approaches.  

Specific P2 technologies mentioned in establishing the pretreatment standards for MP&M existing sources
and new sources (PSES, PSNS) include flow reduction using flow restrictors, conductivity meters, and or
timed rinses for all flowing rinses, plus countercurrent cascade rinsing  for all flowing rinses; centrifugation
and recycling of painting water curtains; and centrifugation and pasteurization to extend the life of water
soluble machining coolants reducing discharge volume.  
             
P2 Compliance Alternative for Metal Finishing Job Shops Subcategory  

U.S EPA is also considering a pollution prevention (P2) compliance alternative for this subcategory.  The P2
Alternative would allow facilities with approval by their control authority (e.g. POTWs), to use P2 practices in
lieu of meeting the MP&M requirements.  These facilities would still be required to maintain compliance with
existing 40 CFR 433 and 413 requirements or local water-quality based limits (whichever is more stringent).  

Comment Period Ends May 3, 2001








Jeff Lewis
Ohio EPA/Office of Pollution Prevention
Lazarus Government Center
P.O. Box 1049
Columbus, Ohio 43216-1049
jeff.lewis@epa.state.oh.us
phone:  614.644.2812
fax:  614.644.2807