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1、a Date: 16 October 2007 Origin: European Latest date for receipt of comments: 31 January 2008 Project no.: 2007/02183 Responsible committee: EH/5 Sludge characterization Interested committees: Title: Draft BS EN 14701-4 Characterisation of sludges - Filtration properties Part 4 : Determination of dr
2、ainability of flocculated sludges Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details b
3、elow). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 January 2008. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be
4、 sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is l
5、imited to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email ordersbsi-. British, International and foreign standards are also available from BSI Customer Services. Info
6、rmation on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Stan
7、dards Online Service on the BSI web site http:/www.bsi-. Direct tel: 020 8996 7565 Responsible Committee Secretary: Miss Charlotte Armstrong (BSI) E-mail: charlotte.armstrongbsi- Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 899
8、6 7001 Form 36 Version 7.0 DPC: 07/30170135 DC Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:15:14 GMT+00:00 2007, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on European discussions in which the UK has taken an active part. Your
9、comments on this draft are welcome and will assist in the preparation of the consequent British Standard. If no comments are received to the contrary, then the UK will approve this draft and implement it as a British Standard. Comment is particularly welcome on national, legislative or similar devia
10、tions that may be necessary. Even if this draft standard is not approved by the UK, if it receives the necessary support in Europe, the UK will be obliged to publish the official English Language text unchanged as a British Standard and to withdraw any conflicting standard. UK Vote Please indicate w
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14、m the BSI web site at: http:/www.bsi- Template for comments and secretariat observations Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex (e.g. 3.1) Paragraph/ Figure/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by th
15、e MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be support
16、ed as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:15:14 GM
17、T+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM DRAFT prEN 14701-4 October 2007 ICS 13.030.20 English Version Characterization of sludges - Filtration properties - Part 4: Determination of the drainability of flocculated sludges Caractrisation des boues - P
18、roprits de filtration - Partie 4: Dtermination de laptitude lgouttage des boues flocules This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 308. If this draft becomes a European Standard, CEN members are bound to comply with t
19、he CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language mad
20、e by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, Fran
21、ce, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Recipients of this draft are invited to submit, with their comments, notification of any rel
22、evant patent rights of which they are aware and to provide supporting documentation. Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard. EUROPEAN COMMITTEE FOR STAND
23、ARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. prEN 14701-4:2007: E Licensed Copy: London South Bank
24、University, London South Bank University, Fri Nov 16 07:15:14 GMT+00:00 2007, Uncontrolled Copy, (c) BSI prEN 14701-4:2007 (E) 2 Contents Page Foreword3 Introduction.4 1 Scope 5 2 Normative references5 3 Terms and definitions .5 4 Sludge conditioning 5 5 Principle of draining tests.6 6 Apparatus .6
25、7 Procedure .6 8 Expression of results 7 9 Test report7 Annex A (informative) Typical gravity drainage cell8 Annex B (informative) Quantity of sludge in a gravity belt filtration .9 Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:15:14 GMT+00:00 2007, Uncontr
26、olled Copy, (c) BSI prEN 14701-4:2007 (E) 3 Foreword This document (prEN 14701-4:2007) has been prepared by Technical Committee CEN/TC 308 “Characterization of sludges”, the secretariat of which is held by AFNOR. This document is currently submitted to the CEN Enquiry. Other parts of this European S
27、tandard are: Part 1: Capillary suction time (CST); Part 2: Determination of the specific resistance to filtration; Part 3: Determination of the compressibility. Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:15:14 GMT+00:00 2007, Uncontrolled Copy, (c) BSI p
28、rEN 14701-4:2007 (E) 4 Introduction The determination of drainability of flocculated sludges is an important parameter for evaluating their suitability to be thickened by means of a draining process. It also gives indications for the choice of flocculant or their dosage in view of the thickening of
29、the sludge through a filtering medium. These easy and quick tests are the best means to narrow the number of products to be tested in full scale experiments and to adapt the pre- treatment to the sludge variability. The results obtained are the mass of filtrate collected in a standard time or the ti
30、me required to recover a given volume of filtrate (commonly 1/10 of the water content of the sludge), the maximum volume of filtrate and the sludge dryness that could be obtained, the solids remaining in the filtrate and the best flocculant and its optimum dose in the case of comparative tests. Lice
31、nsed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:15:14 GMT+00:00 2007, Uncontrolled Copy, (c) BSI prEN 14701-4:2007 (E) 5 1 Scope This document specifies a method for the determination of drainability of flocculated sludges. It is applicable to sludge and sludge s
32、uspensions from: storm water handling; urban wastewater collecting systems; urban wastewater treatment plants; treating industrial wastewater similar to urban wastewater (as defined in Directive 91/271/EEC); water supply treatment plants. This method is also applicable to sludge suspensions from oth
33、er origin. Anycase, it is applicable to all kinds of sludges provided particles are larger than 500 m in size. That is why the test should preferably be performed on sludges first flocculated. 2 Normative references The following referenced documents are indispensable for the application of this doc
34、ument. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12832, Characterization of sludges Utilization and disposal of sludges Vocabulary EN 12880, Characterization of sludges Determinat
35、ion of dry residue and water content CEN/TR 14742, Characterization of sludges Laboratory chemical conditioning procedure 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12832 and the following apply. 3.1 drainability ability of treated sludge to sepa
36、rate from sludge liquor by gravity filtration 3.2 flocculation coagulation by means of inorganic flocculantsor organic ones (polyelectrolytes) 4 Sludge conditioning For flocculation, the sludge will be mixed with flocculant in repeatable and quantified conditions according to CEN/TR 14742. Licensed
37、Copy: London South Bank University, London South Bank University, Fri Nov 16 07:15:14 GMT+00:00 2007, Uncontrolled Copy, (c) BSI prEN 14701-4:2007 (E) 6 5 Principle of draining tests A given volume of sludge is poured in a filter cell, the mass of filtrate collected is recorded versus time and the d
38、ryness of the sludge retained on the filtering medium and the solids remaining in the filtrate are measured. 6 Apparatus Ordinary laboratory apparatus and the following (see Annex A, informative): 6.1 cylindrical acrylic glass tube of a height ranging from 5 cm to 30 cm and a diameter ranging from 5
39、 cm to 20 cm. It is supported by a system composed of a filtering medium tightened in a corpse equipped with a sealing joint in Viton 1) 6.2 the characteristics of the filtering medium shall be the same of that used in the full scale drainage device 6.3 filtrate collector fixed under the filtering m
40、edium 6.4 beaker for the filtrate collection 6.5 weighing balance with an accuracy of at least 0,1 g connected to a computer to continuously record the cumulative mass of filtrate collected over time. The software will be able to record data every 0,5 s 6.6 apparatus for the determination of dry sol
41、ids content of the sludge retained on the filtering medium 6.7 apparatus for the determination of suspended solids in the filtrate NOTE To allow a correct interpretation of data, the comparison of flocculation conditions should be made with the same test equipment. 7 Procedure 1) Prepare the balance
42、 and the software to record the mass of filtrate as soon as the first drops of filtrate are collected. 2) Measure the water content of the flocculated sludge and gently pour it on the whole surface of the filtering medium (for gravity belt filtration see Annex B, informative) 3) Record the cumulativ
43、e mass of filtrate collected over time every 0,5 s at least during the first 30 s. 4) Stop the test when the mass of filtrate to initial mass of sludge ratio is constant to within 0,01 or after 10 min. 5) Measure the concentration of suspended solids in the filtrate and the dry residue of material r
44、etained on the filter medium (EN 12880). 6) Repeat steps 1) to 5) for at least two times. 1) . This information is given for the convenience of users of this European standard and does not constitute an endorsement by CEN of the product named. Equivalent products may be used if they can be shown to
45、lead to the same results. Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:15:14 GMT+00:00 2007, Uncontrolled Copy, (c) BSI prEN 14701-4:2007 (E) 7 8 Expression of results Plot the curve ( )tf M M = 0 where: M is the mass of filtrate, in g; M0 is the initial m
46、ass of sludge, in g; t is the time of experiment, in s; Record the following data obtained for each test 1) Volume of filtrate recovered at t = 30 s, t = 90 s and at the end of the test; 2) Time necessary to collect a volume of filtrate corresponding to 10 1 of the water content of the sludge; 3) We
47、t and dry residue of sludge retained on the filtering medium; 4) Mass of suspended solids in the filtrate. NOTE The optimal operating conditions are those for which the drainage is the fastest during the first 10 s (the highest initial slope of the curve), the mass of wet and dry solids retained on
48、the filter medium is the highest, and the mass of suspended solids in the filtrate is the lowest. 9 Test report The test report shall contain the following information: a) Reference to this document; b) Identification of the sludge (origin, type, identification, concentration, method of sampling and
49、 storage); c) Identification of the flocculation conditions (characteristics of flocculant and dosage); d) Identification of the apparatus (cell diameter, initial mass and water content of sludge, reference and supplier of the filtering medium); e) The mass recovered versus elapsed time with especially the volume of filtrate collected at t = 30 s, at t = 90 s and at the end of the test and the time corresponding to the collection of 10 1 of th