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A,��•r�T�. 0 I L/WAT E R S E PA RATO RS
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<br /> Best Environmental Practices for Auto Repair and Fleet Maintenance • November 1999
<br /> Simplified diagram o/ OWS operotion Why be concerned
<br /> � WASTEWATER-oil, water and solids about oil/water separators?
<br /> Oil/water separators(OWS)can be costly to maintain,and if not prop-
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<br /> �v' �:;i.�xx�,�,' �`�;�� _ "�` = °�;':'`�:� erly managed, can pollute surface and ground water, and lead to costly
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<br /> �� ''�'��.J `� ' `''�"` violations. Have ou taken ste s to minimize the effects of your OWS
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<br /> '�+��f;p�'�����i�h��';�t�..�, ="r��'�`���'�h'`����"'+`'�"�'���';:� on your budget and the environment?This fact sheet discusses the �
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<br /> �,;,k;��,�,�; �?�t ,�,;;��F _ ;-;e, : basic operation of OWSs in handling vehide and floor wash water,and �
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<br /> �_ ,,,�' :f�•, �;,�_..,,kT'�;�`' ���-��,�_'�,�r''_-_ techniques to improve OWS pertormance and reduce costs a d t ab p
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<br /> _= � - =;,�`h'•:'a_=..,F��3:,;,^�_',.•�-`-,,:r;,-,-_ ties.To make sure your OWS works properly, remember. y�
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<br /> ��.'t,5=`�;�;;; , _ :_y,E�s` '� _ �:�����"��`;,':._ .";F'"= Eliminate contaminants: Don't rely on the OWS to handle wash Z�
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<br /> -- =:e.�; ,,1�'L'�T'��= ===W��' " '" - .,�� water from fuel, coolant, solvent, oil, or paint spills. Instead, dean
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<br /> *�,z���'""'£�"�'�`�' =r�;�; _�':�`=`- =�=��:-.;,c::;� _- Floor Cleanup fact sheet). p
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<br /> ";�ux���;.�,;r,�k�"�=r-�`, ��"�"�5:{ �3r�"r�:-"'{�M`r;; '�� �,1,�,'��°_ Wash without detergents: Emulsifying cleaning compounds dis- �
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<br /> •�°1�'�-'= -r;��� -�°'�'��-' ��'`�_���=��"���� perse oil in wash water and make OWSs ineffective-oil passes �
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<br /> � � . � _.� , right through to the sewer. High pressure water or non-emulsifying
<br /> deaners are sufficient for most deaning applications. D
<br /> Heavier or Lighter Than Water7 OWSs treat vehicle Minimize Loading: Minimize the amount of solids and oils that �
<br /> and floor wash water by allowing substances lighter =
<br /> enter your OWS. The less solids and oils that reach the OWS, the �
<br /> than water to float and substances heavier than water less frequently sludge and floating oil must be removed from the "�
<br /> to sink. Many OWSs also have baffles, coalescers, OWS and the better it will work. Also, minimize the amount of wash �
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<br /> and oi( skimmers to speed-up or enhance separation water reaching the OWS. Excessive water flow can flood an OWS, �
<br /> of these substances. forcing wastewater through it too fast to allow separation; the �
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<br /> result: oil and other contaminants pass right through to the sewer. _
<br /> OWSs should not be used to treat storm water runoff. �
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<br /> TROUBLE SITUATIONS POTENTIAL IMPACT REMEDY �
<br /> Chemiqts aMl sp�t(s •Sewer discharge violation •Eliminate floor drains from shop o
<br /> �h pW$ •Sludge requires disposal •Clean up spills when and where they occur T
<br /> as hazardous waste •Use dry cleanup techniques in shop �
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<br /> Sludse bullds up in OMIS . •OWS is less effective because •Eliminate storm water flow into the OWS using berms or curbs N
<br /> solids have less time to settle •Install additional grates and screens on drains
<br /> •Use sloping pavement and sediment traps around drains
<br /> Fxcessive Noatin�d[ •Oil discharged to sewer •Pump out accumulated oil on a regular schedule
<br /> sttumuliites in OWS during high flow periods •Use oil-only absorbent pads to remove and recycle oil
<br /> •Use high-pressure,low-volume sprays for vehicle washing
<br /> Deter�ents reath OYYS •Oil is emulsified and •Do not use oil-emulsifying cleaning solutions(detergents)
<br /> ftows out of OWS to sewer •Wash vehicles and engines less often
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