GREASE SEPARATORS INSTALLATION DIAGRAM 1 OILS AND GREASES SEDIMENTS

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Alannah Higgins
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STILLING AREA: zone into which the separated and treated effuent fows. 3.

1 1. OILS AND GREASES: inet zone in which the turbuence of the inet fow is dampened and in which the substances with a specific weight ower than water (ois, foams, etc...) accumuate. 1 OILS AND GREASES 2. STILLING AREA: zone into which the separated and treated effuent fows. 3. SEDIMENTS: area in which temporary accumuation of the soids (food waste, etc...) takes pace. 2 3 SEDIMENTS INSTALLATION DIAGRAM OUTLET Grease separator Imhoff bioogica tank 8 SEWAGE TREATMENT DIVISION ROTOTEC

SPECIFICATIONS TECNICAL CARACTERISTICS: The grease separator is a physica pre-treatment process that removes ois, foams, greases and a substances of specific

The grease separator is nothing more than a stiing tank in which the substances of specific weight ess than water are separated by foatation (surface).

USE: primary treatment of grey water from kitchens, washbasins, bidets, showers, baths, washing machines and dishwashers.

UNI EN 1825-1 Grease separators Part 1: Principes of design, performance and testing, marking and quaity contro".

2 SPECIFICATIONS TECNICAL CARACTERISTICS: The grease separator is a physica pre-treatment process that removes ois, foams, greases and a substances of specific weight ess than that of the effuent. The grease separator is nothing more than a stiing tank in which the substances of specific weight ess than water are separated by foatation (surface). Sedimentation aso takes pace, with a part of the suspended soids depositing at the bottom of the tank. USE: primary treatment of grey water from kitchens, washbasins, bidets, showers, baths, washing machines and dishwashers. PRODUCT CERTIFICATION Rototec grease separators (with the exception of the moduar range) are CE marked and are designed, tested and certified compiant with UNI EN Grease separators Part 1: Principes of design, performance and testing, marking and quaity contro". The grease separators have been verified and tested at Rototec and by a third party certifying body, and have been found to compy with the necessary requirements. Watertightness Structura stabiity Determination of the nomina size Functiona requirements Reaction to fire Cass E CERTIFIED UNI EN SEPARATION BAFFLES Grease separators with separation baffes OILS AND GREASES SEDIMENTS SEWAGE TREATMENT DIVISION ROTOTEC 9

3 MODEL SMOOT SEPARATION BAFFLES CORRUGATED MODULAR ELIPSE MODULAR I O Length 10 SEWAGE TREATMENT DIVISION ROTOTEC

4 Item Mode Length Width I O I/O Covers Extensions Usefu Grease Sediment NS PE. Price DD CC255 PP DD CC255 PP NDD CC255-CC130 on request DD CC255 PP NDD CC255-CC130 on request NDD CC255-CC130 on request DD CC255-CC140 PP DD CC355-CC255 PP35-PP NDD CC455-CC255 PP45-PP NDD CC355-CC355 PP35-PP NDD CC455-CC255 PP45-PP NDD CC355-CC355 PP35-PP NDD CC455-CC255 PP45-PP NDD CC455-CC355 PP45-PP NDD CC455-CC355 PP45-PP NDD CC455-CC355 PP45-PP NDD CC455-CC355 PP45-PP NDD CC455-CC455 PP45-PP NDD CC455-CC455 PP45-PP NDD CC455-CC455 PP45-PP NDD CC455-CC455 PP45-PP ITDD TAP700 2 x PP ITDD TAP700 2 x PP ITDD TAP700 2 x PP ITDD TAP700 2 x PP PE. = popuation equivaent: = diameter; = height; I = inet pipe height; O = outet pipe height; I/O = inet/outet pipe diameter; NS = imit fow rate (/s). SEWAGE TREATMENT DIVISION ROTOTEC 11

5 TECNICAL SECTION - TECNICAL CARACTERISTICS The grease separator is a physica pre-treatment process that removes ois, foams, greases and a substances of specific weight ess than that of the effuent. Greases and ois produced during norma domestic activities derive from the consumption of butter, margarine, ard and vegetabe ois. They aso originate from waste meat and vegetabes and from some cosmetic products. Greases are insoube in water and have a ow density. In the presence of surface-active agents (detergents), they create stabe foams of foating materias that can cause an accumuation of putrescibe substances in the sewerage pipes and render oxygenation of the sewage difficut, which aso has a detrimenta effect on the bioogica treatment processes ocated downstream. The grease separator is nothing more than a stiing tank in which the substances of specific weight ess than water are separated by foatation (surface). The reduced veocity of the fuid aso aows sedimentation of a part of the suspended soids which deposit at the bottom of the tank. As temperature has a considerabe infuence on the operation of the grease separator, the separation process becomes 100% effective when the temperature does not rise much above the meting point of the greases, estimated as being around 20 C. Rototec gravity grease separators consist of a poyethyene tank with two semi-submerged inet and outet pipes at different eves. The working voume is divided into three compartments: an inet zone in which the turbuence of the inet fow is dampened, a second zone in which the separation takes pace together with temporary accumuation of the soids and a third outet zone for the treated effuent. The onger the retention time of the sewage in the grease separator the more efficient is the remova of the foating materias. This retention time must nevertheess be more than 3 minutes at peak fow. The grease separators are certified in accordance with standard UNI-EN and guarantee a sewage retention time of at east 4 minutes at peak fow (Qmax), taking into account the avaiabe voume ony, i.e. that not occupied by greases or heavy sediments. This guarantees retention times at mean daiy fow rates of more than 15 minutes. USE AND MAINTENANCE The substances removed by foatation accumuate at the surface of the grease separator in the form of a surface crust, whie the heavier soids sette at the bottom of the tank to form a deposit of putrescibe sudge. It is advisabe to provide for the periodic remova of the accumuated materias by speciaist technicians, as they reduce the effective voume required for the passage of the effuent, thus reducing the retention time and, as a resut, compromising the efficiency of the pant. An excessive accumuation of sudge in the grease separator can cause septic conditions to deveop, resuting in resuting bad smes, in particuar during the suer. MANAGEMENT WAT TO DO WEN OW Inspect the grease separator Every 1 / 2 months Remove the surface crust, the setted sudge and cean the inet and outet pipes Every 6 / 12 months Unscrew the covers on the inspection hoes and check the eve of sediment and the surface crust. Contact a icensed waste disposa company N.B. the frequency of ceaning depends on the amount of oi, grease and soids in the wastewater. PROIBITIONS do not use toxic and/or poisonous substances (beach, sovents, insecticides, disinfectant substances, aggressive detergents), aways use biodegradabe products; NEVER aow rainwater to enter the system. WARNINGS make sure that drains have a siphon; check that the pipes have sufficient gradient (approximatey 1% - 2%); connect the biogas vent pipe (see underground instaation); in the case where grey water and sewage fow through the same pipe, DO NOT insta the grease separator, but an Imhoff septic tank one cass higher than that for the Popuation Equivaent (P.E.) number; after emptying, fi the tank again with cean water; in the event of a maintenance operation of any kind, aways compy with the safety reguations regarding operations within encosed wastewater treatment areas and with the genera technica procedures appicabe. 12 SEWAGE TREATMENT DIVISION ROTOTEC

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