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1、BRITISH STANDARD BS EN 1825-2:2002 Grease separators Part 2: Selection of nominal size, installation, operation and maintenance The European Standard EN 1825-2:2002 has the status of a British Standard ICS 13.060.99 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 1825-2:
2、2002 This British Standard, having been prepared under the direction of the Building and Civil Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 29 March 2002 BSI 29 March 2002 ISBN 0 580 38215 X National foreword Th
3、is British Standard is the official English language version of EN 1825-2:2002. The UK participation in its preparation was entrusted to Technical Committee B/505, Wastewater engineering, which has the responsibility to: A list of organizations represented on this committee can be obtained on reques
4、t to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the
5、 BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid
6、enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comp
7、rises a front cover, an inside front cover, the EN title page, pages 2 to 27 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 标准分享网 w w w .b z f x w .c o m 免费下载 EUROPEAN STANDARD
8、 NORME EUROPENNE EUROPISCHE NORM EN 1825-2 February 2002 ICS 13.060.30 English version Grease separators - Part 2: Selection of nominal size, installation, operation and maintenance Installations de sparation de graisses - Partie 2: Choix des tailles nominales, installation, service et entretien Abs
9、cheideranlagen fr Fette - Teil 2: Wahl der Nenngre, Einbau, Betrieb und Wartung This European Standard was approved by CEN on 29 September 2001. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a
10、national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in
11、any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germa
12、ny, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2002 CENAl
13、l rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1825-2:2002 E EN 1825-2:2002 (E) 2 Contents page Foreword3 1Scope 3 2Normative references 3 3Terms and definitions3 4Application4 5Nominal size.5 6Selection of the nominal size5 6.1General5
14、 6.2Determination of the specific values .5 6.2.1Maximum flow rate of wastewater5 6.2.2Temperature factor ft.6 6.2.3Density factor fd.6 6.2.4Detergent and rinsing agent factor fr7 6.3Special cases7 6.4Determination of sludge trap volume 7 7Installation8 7.1Limitations8 7.2Place of installation .8 7.
15、3Drainage to and from the separator.8 7.4Ventilation.8 8Operation, inspection and maintenance .9 Annex A (normative) Calculation of maximum wastewater flow Qs.10 A.1Calculation based on equipment/fittings discharging into the separator .10 A.1.1General10 A.1.2Maximum wastewater flow rate Qs10 A.2Met
16、hod based upon the type of establishment discharging into the separator.11 A.2.1General11 A.2.2Maximum wastewater flow rate Qs11 Annex B (informative) Densities of greases and oils14 Annex C (informative) Examples of determining nominal size of grease separator.16 C.1Examples of calculation based on
17、 equipment/fittings discharging into the separator16 C.2Examples of calculation based on the type of establishment discharging into the separator .21 Annex D (informative) Measures to prevent grease accumulating and grease build-up in the pipelines upstream of the grease separator26 Bibliography27 标
18、准分享网 w w w .b z f x w .c o m 免费下载 EN 1825-2:2002 (E) 3 Foreword This document EN 1825-2:2002 has been prepared by Technical Committee CEN/TC 165 “Wastewater engineering“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publi
19、cation of an identical text or by endorsement, at the latest by August 2002, and conflicting national standards shall be withdrawn at the latest by June 2004. When pollution control requires the treatment of pollutants other than light liquids, additional measures might be necessary. It is the secon
20、d part of a two part standard for grease separators. Part 1 gives principles of design, performance and testing, marking and quality control of grease separators. Annex A is normative. The annexes B, C and D are informative. According to the CEN/CENELEC Internal Regulations, the national standards o
21、rganizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Italy, Ireland, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 1 Scope Th
22、is European Standard provides guidance on the selection of nominal sizes, installation, operation and mainten- ance of grease separators manufactured in accordance with prEN 1825-1. This standard does not apply to wastewater containing light liquids, e.g. grease or oils of mineral origin, and does n
23、ot include treating stable emulsions of grease or oil in water. The standard does not cover the use of biological additives (bacteria, enzymes). 2 Normative references This European Standard incorporates by dated or undated references, provisions from other publications. These normative references a
24、re cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest
25、 edition of the publication referred to applies (including amendments). prEN 1825-1:2000, Grease separators Part 1: Principles of design, performance and testing, marking and quality control. EN 12056-2, Gravity drainage systems inside buildings Part 2: Sanitary pipework, layout and calculation. 3 T
26、erms and definitions For the purposes of this European Standard the terms and definitions given in prEN 1825-1 and EN 12056-2 and the following apply. EN 1825-2:2002 (E) 4 3.1 selection of the nominal size determination of the appropriate nominal size of the grease separation chamber for a specific
27、case, based on amount and type of influent 4 Application Grease separators shall be used wherever it is necessary to separate greases and oils of vegetable and animal origin from wastewater, such as in trade or industrial plants/establishments, e.g. ? commercial kitchens and large catering establish
28、ments, e.g. in inns, hotels, motorways service stations, canteens; ? grilling, roasting and frying facilities; ? food distribution points (with returnable crockery); ? butchers shops, with or without slaughtering facilities; ? meat and sausage factories, with or without slaughtering facilities; ? ab
29、attoirs; ? poultry slaughterers; ? tripe preparation plants; ? animal rendering plants; ? bone and glue boiling plants; ? soap and stearine factories; ? oil mills; ? vegetable oil refineries; ? margarine factories; ? pickling plants; ? fast-food preparation plants; ? chip and crisp producers; ? pean
30、ut roasting plants. Wastewater containing a considerable proportion of grease in a non-separable form (i.e. emulsified) from applications such as dairy, cheese making and fish processing, or from distribution points having only dish washing facilities, or from “wet waste compactors“, will only be ef
31、fectively treated in grease separators under certain conditions. The wastewater may require further treatment. Applications where the discharged wastewater contains solids that are quick to purify (e.g. the fish industry) do not require a sludge trap, but the grease separator shall be fitted with a
32、strainer or screening device fitted on the inlet side to retain coarse solids. Any retained solids should be removed and the separator thoroughly flushed with clean water before operational intervals to prevent putrefaction. 标准分享网 w w w .b z f x w .c o m 免费下载 EN 1825-2:2002 (E) 5 5 Nominal size For
33、the preferred nominal sizes (NS) see clause 4 of prEN 1825-1:2000. Multiple separators of the same nominal size may be connected in parallel with the flow split equally between each separator. 6 Selection of the nominal size 6.1 General The selection of the nominal sizes shall be based on the nature
34、 and quantity of wastewater to be treated taking into account: ? maximum flow rate of wastewater; ? maximum temperature of the wastewater; ? density of grease/oils to be separated; ? influence of cleansing and rinsing agents. If a grease storage capacity greater than 40 NS in litres is required, e.g
35、. when more than the usual amount of grease is expected, the following options may be used: 1) using a larger nominal size separator than calculated or 2) creating grease storage capacity outside the separator or 3) emptying the separator more frequently than usually. Where no specific sizing method
36、 is offered by a regulatory authority, then the nominal size of the separator shall be determined from the following formula: rdts NSff fQ?(1) where NS is the calculated nominal size of the separator; Qsis the maximum flow rate of wastewater, entering the separator in litres per second; ftis the imp
37、edient factor for the temperature of influent; fdis the density factor for the relevant grease/oil; fris the impedient factor for the influence of cleansing and rinsing agents. After calculation select the next higher preferred nominal size in accordance with clause 4 of prEN 1825-1:2000. 6.2 Determ
38、ination of the specific values 6.2.1 Maximum flow rate of wastewater The maximum flow rate of wastewater Qs shall be determined by: EN 1825-2:2002 (E) 6 a) measurement, or b) calculation based upon catering equipment discharging into the grease separator, or c) calculation based upon the type of est
39、ablishment discharging into the grease separator, or d) special calculation for individual cases, if acceptable by the regulatory authority. Where data is available to determine Qs by b) or c), and the designer is unsure of the most appropriate option of use, it is recommended that the higher of the
40、 flow rates determined from both calculations is used. 6.2.2 Temperature factor ft High wastewater temperature reduces the efficiency of grease separators. Temperature factors ft are given in Table 1. Table 1 Temperature factor ft Temperature of wastewater at inlet C Temperature factor ft ?1,0 alway
41、s or occasionally 601,3 6.2.3 Density factor fd A density factor fd = 1,0 shall be used for wastewater discharged from kitchens, abattoirs and meat and fish processing plants. When the nature of grease/oil is well known, the density coefficient may be taken from Figure 1, where fd is plotted for a r
42、ange of different grease and oil densities. For grease/oil densities 0,94 g/cm3, a density factor of 1,5 shall be used. Densities of different fats and oils are given in annex B. 标准分享网 w w w .b z f x w .c o m 免费下载 EN 1825-2:2002 (E) 7 Figure 1 Relation between fd and density 6.2.4 Detergent and rins
43、ing agent factor fr Detergents, including dishwasher powders and rinsing agents, should carefully be selected and used sparingly. They shall not impair the separating effect as far as possible and not form stable emulsions where they are used upstream of a separator. A detergent and rinsing agent co
44、efficient shall be chosen from Table 2. Table 2 Detergent and rinsing agent coefficient fr Use of detergent and rinsing agents Detergent and rinsing agent coefficient fr Never used1,0 Occasionally or always used1,3 Special cases, e.g. hospitals? National and local regulations may limit the use of ce
45、rtain detergents, rinsing agents and solvents. 6.3 Special cases For industrial plants such as abattoirs and wholesale butchers, the grease separator nominal size NS should be selected on the basis of site specific investigation. 6.4 Determination of sludge trap volume The sludge trap volume shall b
46、e at least 100 NS in litres but for abattoirs and similar plants a volume of at least 200 NS in litres is recommended. EN 1825-2:2002 (E) 8 7 Installation 7.1 Limitations Only wastewater containing organic grease and oils shall be discharged to a grease separator. In particular, the following shall
47、not be discharged to a grease separator: ? wastewater containing faeces (“black“ water); ? rainwater; ? wastewater containing light liquids, e.g. grease or oil of mineral origin. 7.2 Place of installation Grease separators should be installed close to the sources of wastewater but should not be site
48、d in unventilated rooms, roads, car parks or storage areas. To prevent odour and fly nuisance, separators should not be sited close to habitable buildings, especially to opening windows and air intakes. They shall be easily accessible to cleaning vehicles. Specific operational and structural conditi
49、ons may require the separator to be remotely located from the source of wastewater. Separators should be installed in such a way to prevent frost damage, and allow all parts requiring regular maintenance to be easily accessible at all times. Where necessary, manhole covers on separators shall be supported so that the load imposed on the separator does not exceed its design strength. 7.3 Drainage to and from the separator Where no specific local regulations exist, grease separators shall be connected to the drains and sewers as f