1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 8525-2:2011Greywater systems Part 2: Domestic greywatertreatment equipment Requirements and test methodsPublishing and copyright informationThe BSI copyright notice displayed
2、in this document indicates when the documentwas last issued. BSI 2011ISBN 978 0 580 63476 5ICS 23.020.92; 91.140.80The following BSI references relate to the work on this standard:Committee reference CB/506Draft for comment 10/30184124 DCPublication historyFirst (present) edition, August 2011Amendme
3、nts issued since publicationDate Text affectedBS 8525-2:2011 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Terms, definitions and abbreviations 24 Nominal designation 35 Acceptance flow rate and acceptance volume 36 Water tightness and overflow 47 Controls and failsafe provis
4、ions 48 Treated greywater quality (based on end use application) 59 Marking and information to be supplied by the manufacturer 7AnnexesAnnex A (normative) Preparation for testing 9Annex B (normative) Method of test for hydraulic functions 12Annex C (normative) Synthetic greywater for type testing 15
5、Annex D (normative) Method of test for water quality 17Annex E (informative) Analytical methods 21Annex F (informative) Domestic greywater treatment equipment productinformation sheet 22Bibliography 23List of figuresFigure A.1 Test arrangement for a gravity-fed greywater system withintermediate stor
6、age cistern 11Figure A.2 Test arrangement for a greywater system with direct pumping 12Figure F.1 Example of a product information sheet 22List of tablesTable 1 Microbiological quality of treated greywater for type tests 6Table 2 Chemical and physical quality of treated greywater for type tests 6Tab
7、le C.1 Composition of synthetic greywater 16Table D.1 Test methods for microbiological, chemical and physical testing 20Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 24, an inside back cover and a back cover.BRITISH STANDARD BS 8525-2:2011 BSI
8、 2011 iForewordPublishing informationThis part of BS 8525 is published by BSI and came into effect on 15 August 2011.It was prepared by Technical Committee CB/506, Water reuse. A list oforganizations represented on this committee can be obtained on request to itssecretary.Relationship with other pub
9、licationsBS 8525 is published in two parts: Part 1: Code of practice; Part 2: Domestic greywater treatment equipment Requirements and testmethods.Use of this documentIt has been assumed in the preparation of this British Standard that theexecution of its provisions will be entrusted to appropriately
10、 qualified andexperienced people, for whose use it has been produced.Hazard warningsWARNING. This British Standard calls for the use of sewage effluent and this canbe injurious to health if adequate precautions are not taken, such as the use ofsuitable personal protective equipment. It refers only t
11、o technical suitability anddoes not absolve the user from legal obligations relating to health and safety atany stage.Assessed capability. Users of this part of BS 8525 are advised to consider thedesirability of quality system assessment and registration against the appropriatestandard in the BS EN
12、ISO 9000 series by an accredited third-party certificationbody.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary, explanation and general informat
13、ive material is presented insmaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standar
14、d cannot confer immunity from legalobligations.In particular, attention is drawn to the following regulations: The Water Industry Act 1999 1; The Water (Scotland) Act 1980 2; The Water and Sewerage Services (2006 Order) (Commencement No. 3)Order (Northern Ireland) 2010 3; The Water Fittings Regulati
15、ons 4;BRITISH STANDARDBS 8525-2:2011ii BSI 2011NOTE In this standard, the following national regulations, which apply to plumbingsystems in water has been, or is to be, provided, are referred to as the “WaterFittings Regulations 4”:a) The Water Supply (Water Fittings) (Amendment) Regulations 1999, i
16、n England b) The Water Byelaws 2004 (Scotland), in Scotland;c) The Water Supply (Water Fittings) Regulations (Northern Ireland) 2009, inNorthern Ireland. The Private Water Supplies Regulations 2009 5; The Private Water Supplies (Scotland) Regulations 2006 6; The Private Water Supplies (Wales) (Amend
17、ment) Regulations 2010 7; The Private Water Supplies (Amendment) Regulations (Northern Ireland)2010 8; The Health and Safety at Work etc. Act 1974 9; The Workplace (Health, Safety and Welfare) Regulations 1992 10; The Building Regulations (England and Wales) 2010 11; The Building Standards (Scotland
18、) Amendment Regulations 2001Amendment Regulations 2002 12; The Building (Amendment) Regulations (Northern Ireland) 2010 13; The Confined Spaces Regulations 1997 14; The Work at Height Regulations 2005 15.BRITISH STANDARD BS 8525-2:2011 BSI 2011 iiiBRITISH STANDARDBS 8525-2:2011This page deliberately
19、 left blankiv BSI 20111 ScopeThis part of BS 8525 specifies requirements and gives methods of test forpackaged and/or site-assembled domestic greywater treatment equipment. Thisstandard applies to treatment equipment where all prefabricated componentsare factory- or site-assembled by one manufacture
20、r and tested as a single unit.This part of BS 8525 does not require specific water treatment processes to beused. However, it applies to equipment that treats bathroom greywater so thatit is of a quality suitable for prescribed domestic uses in residential, commercial,industrial or public premises.
21、It is not applicable to treatment equipment whichprocesses waste from WCs and kitchens.The test methods described in Annex B and Annex D have been devised for thetype testing of domestic greywater treatment equipment with a nominaltreatment capacity of up to 10 m3per day. They are intended to be car
22、ried outon greywater treatment equipment under controlled conditions using publicmains water and synthetic greywater. These test methods are not intended forcommissioning or validation of the on-site performance of the domesticgreywater treatment equipment.NOTE 1 Recommendations for the installation
23、, commissioning and validation ofon-site performance of packaged and/or site-assembled domestic greywatertreatment equipment as part of a greywater system are given in BS 8525-1.NOTE 2 Annex A specifies requirements for the greywater treatment equipmenttest set-up and preparation; Annex B to Annex D
24、 specify greywater treatmentequipment test methods; Annex E and Annex F are informative annexes, the formergiving recommendations regarding analytical methods and the latter providing anexample of a product information sheet.2 Normative referencesStandards publicationsThe following referenced docume
25、nts are indispensable for the application ofthis document. For dated references, only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including anyamendments) applies.BS 1427, Guide to on-site test methods for the analysis of watersBS 6068-2.34, Water
26、 quality Part 2: Physical, chemical and biochemical methods Section 2.34: Method for the determination of the chemical oxygen demandBS 8525-1:2010, Greywater systems Part 1: Code of practiceBS EN 1899-1 (BS 6068-2.63), Water quality Determination of biochemicaloxygen demand after n days (BODn) Part
27、1: Dilution and seeding method withallylthiourea additionBS EN ISO 7027 (BS 6068-2.13), Water quality Determination of turbidityBS EN ISO 7393-2 (BS 6068-2.26), Water quality Determination of free chlorineand total chlorine Part 2: Colorimetric method usingN,N-diethyl-1,4-phenylenediamine for routin
28、e control purposesBS EN ISO 7899-1 (BS 6068-4.3), Water quality Detection and enumeration ofintestinal enterococci Part 1: Miniaturized method (Most Probable Number) forsurface and waste waterBS EN ISO 7899-2 (BS 6068-4.4), Water quality Detection and enumeration ofintestinal enterococci Part 2: Mem
29、brane filtration methodBS EN ISO 9308-1 (BS 6068-4.14), Water quality Detection and enumeration ofEscherichia coli and coliform bacteria Part 1: Membrane filtration methodBRITISH STANDARD BS 8525-2:2011 BSI 2011 1BS EN ISO 9308-3 (BS 6068-4.10), Water quality Detection and enumeration ofEscherichia
30、coli and coliform bacteria Part 3: Miniaturized method (MostProbable Number) for the detection and enumeration of E. coli in surface andwaste waterBS EN ISO 10304-1, Water quality Determination of dissolved anions by liquidchromatography of ions Part 1: Determination of bromide, chloride, fluoride,n
31、itrate, nitrite, phosphate and sulfateBS EN ISO 13395, Water quality Determination of nitrite nitrogen and nitratenitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometricdetectionOther publicationsN1 ENVIRONMENT AGENCY. The chemical disinfecting agents in waters andeffluents Met
32、hods for the examination of waters and associated materials.Blue book 218. Bristol: Environment Agency, 2008.1)3 Terms, definitions and abbreviations3.1 Terms and definitionsFor the purposes of this part of BS 8525, the terms and definitions given inBS 8525-1 and the following apply.3.1.1 acceptance
33、 flow rateflow rate of greywater that the domestic greywater treatment equipment canaccept without overflow or spillage3.1.2 acceptance volumevolume of greywater that the domestic greywater treatment equipment canaccept without overflow3.1.3 back-up water supplysupply of potable water, e.g. from the
34、 public mains water supply, that cansupplement the non-potable water supply in times of drought and/or heavydemand3.1.4 bathroom greywatergreywater from domestic baths, basins, showers and clothes washing machines3.1.5 domestic greywater treatment equipmentpurpose-designed equipment containing one o
35、r more treatment processes withassociated storage, pumping and control systems that accepts and treatsbathroom greywater for defined applicationsNOTE Examples of defined applications are WC flushing and garden irrigation.3.1.6 greywaterdomestic wastewater excluding faecal matter and urineBS EN 1085N
36、OTE This British Standard covers equipment treating bathroom greywater. Forease of reference, where the standard refers to “greywater”, this is assumed to be“bathroom greywater”. See 3.1.4.1)This is available from the Environment Agency website,http:/www.environment-agency.gov.uk.BRITISH STANDARDBS
37、8525-2:20112 BSI 20113.1.7 greywater systemsystem for collecting, treating and distributing greywater which includes thetreatment equipment, collection and distribution pipework and controls3.1.8 maximum pumping headmaximum working pressure of the treated greywater pumpNOTE This is expressed in metr
38、es.3.1.9 maximum storage periodmaximum period that treated greywater can be stored without a deteriorationin water qualityNOTE The water quality and maximum storage period is declared by the greywatertreatment equipment manufacturer.3.1.10 nominal hydraulic daily flowdaily flow of untreated greywate
39、r for which the greywater treatmentequipment is considered suitable by the manufacturerNOTE This can be measured in L/day or m3/day.3.1.11 public mains waterwholesome water supplied by a water undertaker or licensed water supplierNOTE Attention is drawn to the Water Industry Act 1999 1 in England ca
40、tegory of treated greywater output as defined in BS 8525-1 (for example,bathroom greywater for WC flushing and non-spray garden watering); nominal hydraulic daily flow; acceptance flow rate (see Clause 5); acceptance volume (see Clause 5); maximum storage period.5 Acceptance flow rate and acceptance
41、 volumePreparation for testing shall be carried out in accordance with Annex A. A testmethod for hydraulic functions shall subsequently be carried out in accordancewith Annex B.BRITISH STANDARD BS 8525-2:2011 BSI 2011 3When tested in accordance with B.3.1, the greywater treatment equipment shallacce
42、pt public mains water at the acceptance flow rate and acceptance volumedeclared by the manufacturer, without overflow. Unless higher minimum valuesare specified by the manufacturer, the acceptance flow rate shall be not lessthan 0.4 L/s and the acceptance volume shall be not less than 80 L.NOTE 1 Th
43、ese values are deemed to be suitable for single family housingcontaining one bathroom. Higher values might be necessary for larger greywatersystems and manufacturers might declare higher values for these systems.NOTE 2 Acceptance volume is assessed with the treated greywater cistern empty,but otherw
44、ise normal resident levels of water within the greywater treatmentequipment. The acceptance volume may be determined using the minimumacceptance flow rate (see 3.1.1).6 Water tightness and overflowWhen tested in accordance with B.3.2, the greywater treatment equipment shallbe free from leaks.When te
45、sted in accordance with B.3.3, any overflow(s) shall accommodate 110%of the acceptance flow rate.NOTE Attention is drawn to the Water Fittings Regulations 4.7 Controls and failsafe provisions7.1 Controls7.1.1 GeneralFor electrically powered treatment equipment, a control panel and at least onealarm
46、shall be provided to indicate different operational conditions inaccordance with 7.1.2.For non-electrically powered treatment equipment, a manual control regimeshall be specified in the information provided by the manufacturer inaccordance with Clause 9.NOTE Attention is drawn to the Water Fittings
47、Regulations 4 which requireadequate backflow prevention to be provided so that water supplied from thepublic mains for domestic uses does not become contaminated. In premises where apublic mains water supply exists, or is to be provided, notification needs to be givento the local water supplier prio
48、r to work commencing, with a plan, schematicdiagram and details of what is proposed.Backflow prevention devices shall conform to BS 8525-1:2010, 4.7.2.7.1.2 Control panel and alarm(s)Where a control panel is provided, when tested in accordance with Annex B, itshall give visual indicators to demonstr
49、ate the following conditions: that the system is powered; that the system is connected to the back-up supply (e.g. public mains water).Where an alarm is provided, when tested in accordance with Annex B, it shallgive either visual or audible indicators for the following conditions: electrical failure; failure of the back-up water supply, where fitted.BRITISH STANDARDBS 8525-2:20114 BSI 20117.2 Discharge of stored water7.2.1 GeneralWhere the
