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1、BRITISH STANDARD BS EN 12255-14:2003 Wastewater treatment plants Part 14: Disinfection The European Standard EN 12255-14:2003 has the status of a British Standard ICS 13.060.30 ? Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12255-14
2、:2003 This British Standard, was published under the authority of the Standards Policy and Strategy Committee on 14 January 2003 BSI 14 January 2003 ISBN 0 580 43221 1 National foreword This British Standard is the official English language version of EN 12255-14:2003. The UK participation in its pr
3、eparation 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 request to its secretary. Cross-references The British Standards which implement international or European publicati
4、ons referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessa
5、ry provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpr
6、etation, 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 comprises a front cover, an inside front cover, the EN title page, pages 2 to 16, an inside back cover and a bac
7、k cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROP
8、ENNE EUROPISCHE NORM EN 12255-14 December 2003 ICS 13.060.30 English version Wastewater treatment plants - Part 14: Disinfection Stations dpuration - Partie 14: DsinfectionKlranlagen - Teil 14: Desinfektion This European Standard was approved by CEN on 11 September 2003. CEN members are bound to com
9、ply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Se
10、cretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the of
11、ficial versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITT
12、EE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12255-14:2003: E Licensed Copy: sheffie
13、ldun sheffieldun, na, Sat Oct 28 05:45:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12255-14:2003 (E) 2 Contents page Foreword3 1Scope 4 2Normative references 4 3Terms and definitions4 4Design.6 5Requirements.13 Bibliography15 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:33 GMT+0
14、0:00 2006, Uncontrolled Copy, (c) BSI EN 12255-14:2003 (E) 3 Foreword This document (EN 12255-14:2003) 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, eithe
15、r by publication of an identical text or by endorsement, at the latest by June 2004, and conflicting national standards shall be withdrawn at the latest by June 2004. This is the fourteenth Part prepared by the Working Groups CEN/TC 165/WG 42 and WG 43 relating to the general requirements and proces
16、ses for treatment plants for a total number of inhabitants and population equivalents (PT) over 50. EN 12255 with the generic title “Wastewater treatment plants” consists of the following Parts: Part 1: General construction principles Part 3: Preliminary treatment Part 4: Primary settlement Part 5:
17、Lagooning processes Part 6: Activated sludge processes Part 7: Biological fixed-film reactors Part 8: Sludge treatment and storage Part 9: Odour control and ventilation Part 10: Safety principles Part 11: General data required Part 12: Control and automation Part 13: Chemical treatment Treatment of
18、wastewater by precipitation/flocculation Part 14: Disinfection Part 15: Measurement of the oxygen transfer in clean water in aeration tanks of activated sludge plants Part 16: Physical (mechanical) filtration NOTEFor requirements on pumping installations at wastewater treatment plants, provided init
19、ially as Part 2: Pumping installations for wastewater treatment plants, see EN 752-6 Drain and sewer systems outside buildings Part 6: Pumping installations. EN 12255-1, EN 12255-3 to EN 12255-8 and EN 12255-10 and EN 12255-11 were implemented together as a European package (Resolution BT 152/1998).
20、 According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherl
21、ands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12255-14:2003 (E) 4 1 Scope This European Standard specifies performance requirements for the disinfectio
22、n of effluents from wastewater treatment plants. The primary application is for wastewater treatment plants designed for the treatment of domestic and municipal wastewater for over 50 PT. Differences in wastewater treatment throughout Europe have led to a variety of systems being developed. This sta
23、ndard gives fundamental information about the systems, this standard has not attempted to specify all available systems. Detailed information additional to that contained in this standard can be obtained by referring to the bibliography. 2 Normative references This European Standard incorporates by
24、dated or undated reference, provisions from other publications. These normative references are 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 Stand
25、ard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 1085:1997, Wastewater treatment Vocabulary. EN 12255-1, Wastewater treatment plants Part 1: General construction principles. EN 12255
26、-5, Wastewater treatment plants Part 5: Lagooning processes. EN 12255-10, Wastewater treatment plants Part 10: Safety principles. EN 12255-12, Wastewater treatment plants Part 12: Control and automation. 3 Terms and definitions For the purposes of this European Standard, terms and definitions given
27、in EN 1085:1997 and the following apply. 3.1 residual concentration concentration of a disinfectant in the final effluent of the wastewater treatment plant 3.2 UV radiation (UV dose) the received UV-dose over the duration of the UV irradiation along the pathway of an infinitesimal small water volume
28、 expressed in J/m 3.3 UV intensity quotient of the energy flux of the UV radiation received on the surface of an infinitesimal small area divided by the size of the area. The unit of UV intensity is W/m 3.4 UV-reactor a closed vessel reactor or an open channel section with an assembly of UV-lamps ir
29、radiating the water passing through the UV-reactor Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12255-14:2003 (E) 5 3.5 bioassay method to determine the effective UV radiation of an UV system using a calibrated test organism. Calibrati
30、on of test organisms is done in a laboratory device with an UV radiation of a homogeneous and measured intensity (see 15, 20) 3.6 ozone demand amount of ozone required to attain a certain residual ozone concentration in the effluent of a treatment stage. The ozone demand includes the ozone consumpti
31、on due to the decay of the ozone and due to reactions of ozone with any of the pollutants in the water 3.7 chlorinator equipment for dosing chlorine gas into water 3.8 contact basin tank for providing the required detention time for certain reactions to take place 3.9 membrane semipermeable material
32、 used as filter media in membrane filtration processes. Membranes normally are flat sheets, tubes or hollow fibres composed of a thin semipermeable layer on a structural material 3.10 module unit containing an assembly of membranes and systems for distributing the raw water inflow, and systems for c
33、ollecting permeate and the concentrate 3.11 permeate fluids passing through the membrane in membrane filtration processes 3.12 concentrate fluids enriched with substances not passing the membranes in membrane filtration processes 3.13 flux membrane surface area specific rate of fluids passing throug
34、h the membrane in membrane filtration processes normally indicated in l/(m?h). The flux is mainly determined by the wastewater quality, the type of membrane used, the mode of filtration and the transmembrane pressure 3.14 transmembrane pressure pressure difference between concentrate and permeate si
35、de of the membrane 3.15 cross flow filtration filtration with a significant flow parallel to the membrane surface, which is intended to prevent substances from accumulating on the surface of the membrane 3.16 dead end filtration filtration without a significant flow parallel to the membrane surface
36、3.17 perpendicular mixing mixing vertical to floating direction Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12255-14:2003 (E) 6 4 Design 4.1 General Disinfection processes are used to improve the microbiological quality of effluents,
37、if required, e.g. because of sensitive uses of the receiving waters downstream. A disinfection of effluents from wastewater treatment plants can be required to contribute to public health to prevent a contamination by human pathogens of: waters used for bathing and other recreational activities invo
38、lving immersion; shellfisheries; treated wastewater to be reused for unrestricted irrigation or as process water or grey water; sources used for potable water supply. A disinfection of effluents from wastewater treatment can be attained by two possible mechanisms: inactivation of micro-organisms ren
39、dering micro-organisms incapable of reproduction; removing the micro-organisms from an effluent (e.g. by filtration) but not necessarily inactivating them. Processes most commonly used for disinfecting wastewater by removing inactivating micro-organisms are: Ultraviolet (UV)-radiation; Chlorination;
40、 Ozonation. Processes most commonly used for disinfecting wastewater by removing respectively reducing micro-organisms are: membrane filtration; effluent maturation ponds; soil filtration. 4.2 Planning 4.2.1 General Disinfection, if required, should be the last stage in the wastewater treatment proc
41、ess. Poor performance by upstream processes will affect the performance of the disinfection process. If an effluent has to be stored prior to discharge e.g. in case of discharge to tidal water or irrigation it should be preferably disinfected after storage directly prior to discharge in order to lim
42、it regrowth hazards. When planning disinfection systems consideration shall be given to: a) level of disinfection required; b) stability and efficiency of disinfection process; c) technological level of disinfection process; d) operational requirements; e) safety hazards; Licensed Copy: sheffieldun
43、sheffieldun, na, Sat Oct 28 05:45:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12255-14:2003 (E) 7 f) environmental impacts, e.g.: effects on the quality of the effluents (reduction of BOD5,COD, SS, Ptot); deleterious effects of residual disinfectants; production of toxic or bioaccumulating by-p
44、roducts; g) power requirements. 4.2.2 Level of disinfection Disinfection processes shall reduce or inactivate human pathogens to a level that the risk of the disinfected wastewater being a source of infections is minimised. Disinfection processes are not intended to remove all micro- organisms, or e
45、ven remove all human pathogens. The level of disinfection is specified by national and local authorities. The specification of the level of disinfection shall include procedures for sampling, analysis and evaluation. Statistical criteria for complying with the level of disinfection required shall be
46、 named explicitly e.g. for dry weather and storm water conditions. 4.3 Process Design 4.3.1 General A disinfection system has to be designed and sized to ensure that the required treatment (minimum disinfectant dose) is applied to all wastewater; the required level of disinfection is maintained at t
47、he maximum effluent flow rate and disinfectant demand (worst case condition). With respect to the high required reduction rate no short circuiting, by-passing, or incomplete treatment is permitted. The required treatment has to be applied to all wastewater because the microbiological quality of disi
48、nfected wastewater reacts very sensitively to any wastewater not being disinfected properly. NOTEThis is due to the fact that the required reduction of indicator organisms is usually in the magnitude of 99,9 % to 99,99 %. A leakage or short circuiting of 0,01 % to 0,1 % of the wastewater or a reduce
49、d reduction rate of only 99 % in 1 % to 10 % of the wastewater due to incomplete treatment can cause germ counts that already exceed the effluent standards. 4.3.2 UV radiation UV disinfection is the application of UV radiation artificially generated in UV lamps in UV reactors to the wastewater to be disinfected. An appropriate dose of UV radiation will cause an irreversible inactivation of micro-organisms with no other