1、May 2010 Translation by DIN-Sprachendienst.English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 13
2、.030.20!$bA“1633099www.din.deDDIN EN 14701-4Characterization of sludges Filtration properties Part 4: Determination of the drainability of flocculated sludgesEnglish translation of DIN EN 14701-4:2010-05Charakterisierung von Schlmmen Filtrationseigenschaften Teil 4: Bestimmung der Entwsserbarkeit ge
3、flockter SchlmmeEnglische bersetzung von DIN EN 14701-4:2010-05Caractrisation des boues Proprits de filtration Partie 4: Dtermination de laptitude lgouttage des boues floculesTraduction anglaise de DIN EN 14701-4:2010-05www.beuth.deIn case of doubt, the German-language original shall be considered a
4、uthoritative.Document comprises 17 pages04.10 DIN EN 14701-4:2010-05 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 308 “Characterization of sludges” (Secretariat: AFNOR, France). The preliminary work was done by Working Group
5、 WG 1 “Characterization methods”. The responsible German body involved in its preparation was the Normenausschuss Wasserwesen (Water Practice Standards Committee), Working Committee NA 119-01-02-02 UA Chemische und physikalische Verfahren. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14701-4
6、 January 2010 ICS 13.030.20 English Version Characterization of sludges - Filtration properties - Part 4: Determination of the drainability of flocculated sludges Caractrisation des boues - Proprits de filtration - Partie 4: Dtermination de laptitude lgouttage des boues flocules Charakterisierung vo
7、n Schlmmen - Filtrationseigenschaften - Teil 4: Bestimmung der Entwsserbarkeit geflockter Schlmme This European Standard was approved by CEN on 28 November 2009. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
8、 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 CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, G
9、erman). A version in any other language made 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, Croatia, Cyp
10、rus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION C
11、OMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14701-4:2010: EEN 14701-4:2010 (E) 2 Contents Page Foreword . 3I
12、ntroduction . 41 Scope 52 Normative references 53 Terms and definitions . 54 Sludge conditioning 55 Principle . 66 Apparatus . 67 Procedure . 68 Expression of results 79 Test report 710 Precision 8Annex A (informative) Typical gravity drainage cell . 9Annex B (informative) Quantity of sludge in a gr
13、avity belt filtration . 10Annex C (informative) Results of validation trials . 11Bibliography 15DIN EN 14701-4:2010-05 EN 14701-4:2010 (E) 3 Foreword This document (EN 14701-4:2010) has been prepared by Technical Committee CEN/TC 308 “Characterization of sludges”, the secretariat of which is held by
14、 AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2010, and conflicting national standards shall be withdrawn at the latest by July 2010. Attention is drawn to the possibility that some
15、 of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. EN 14701, Characterisation of sludges Filtration properties, consists of the following parts: Part 1: Capillary suction time (CST) Pa
16、rt 2: Determination of the specific resistance to filtration Part 3: Determination of the compressibility According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croa
17、tia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 14701-4:2010-05 EN 14
18、701-4:2010 (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 the sl
19、udge 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 time requ
20、ired to recover a given volume of filtrate (commonly 50 % of the water content of the sludge), the maximum volume of filtrate and the corresponding wet and dry mass of the sludge, the undissolved solids remaining in the filtrate and the best flocculant and its optimum dose in the case of comparative
21、 tests. DIN EN 14701-4:2010-05 EN 14701-4:2010 (E) 5 1 Scope This European Standard specifies a method for the determination of drainability of flocculated sludges. It is applicable to sludge and sludge suspensions from: a) storm water handling; b) urban wastewater collecting systems; c) urban waste
22、water treatment plants; d) treating industrial wastewater similar to urban wastewater (as defined in Directive 91/271/EEC); e) water supply treatment plants. This method is also applicable to sludge suspensions from other origin. 2 Normative references The following referenced documents are indispen
23、sable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 872, Water quality Determination of suspended solids Method by filtration through glass fibre
24、 filters EN 12832:1999, Characterization of sludges Utilization and disposal of sludges Vocabulary EN 12880, Characterization of sludges Determination of dry residue and water content CEN/TR 14742, Characterization of sludges Laboratory chemical conditioning procedure 3 Terms and definitions For the
25、 purposes of this document, the terms and definitions given in EN 12832:1999 and the following apply. 3.1 drainability ability of treated sludge to separate from sludge liquor by gravity filtration 3.2 flocculation coagulation by means of inorganic or organic flocculants (polyelectrolytes) 4 Sludge
26、conditioning For flocculation, the sludge shall be sampled already flocculated or mixed with flocculant in repeatable and quantified conditions according to CEN/TR 14742 for a laboratory preparation. DIN EN 14701-4:2010-05 EN 14701-4:2010 (E) 6 5 Principle A given volume of flocculated sludge is pou
27、red in a filter cell equipped with a known filtering medium, the mass of filtrate collected is recorded versus time and the corresponding wet and dry mass of the sludge retained on the filtering medium and the undissolved solids remaining in the filtrate are measured. 6 Apparatus Ordinary laboratory
28、 apparatus and the following (see informative Annex A): 6.1 Transparent tube (e.g. glass, polyethylene) of 150 mm diameter and of about 200 mm height, supported by a system composed of a filtering medium tightened in a device equipped with an appropriate sealing joint. 6.2 Filtering medium whose cha
29、racteristics shall be the same as that used in the full scale drainage device and in comparative tests. 6.3 Filtrate draining device fixed under the filtering medium. 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 continuous
30、ly record the cumulative mass of filtrate collected over time. The software shall be able to record data every 0,5 s. 6.6 Apparatus for the determination of dry solids content of the sludge retained on the filtering medium. 6.7 Apparatus for the determination of suspended solids in the filtrate. NOT
31、E To allow a correct interpretation of data, the comparison of flocculation conditions should be made with the same test equipment. 7 Procedure a) Prepare the balance and the software to record the mass of filtrate as soon as the first drops of filtrate are collected. b) Measure the water content of
32、 the flocculated sludge. c) Gently pour (without shaking) (1 0,2) l of flocculated sludge (record the exact mass) in the centre of the cell for the sludge to recover the whole surface of the filtering medium. d) Record the cumulative mass of filtrate collected over time every 0,5 s at least during t
33、he first 30 s. e) Stop the test when the mass of filtrate to initial mass of sludge ratio is constant to within 0,1 g or after 10 min. f) Measure the concentration of suspended solids in the filtrate (see EN 872) and the wet and dry mass of the sludge retained on the filter medium (see EN 12880). g)
34、 Repeat steps a) to f) for at least twice if repeatability measurements are needed. DIN EN 14701-4:2010-05 EN 14701-4:2010 (E) 7 8 Expression of results Plot adimensional mass versus time: ()tfMM=0where M is the mass of filtrate, in grams (g); M0is the initial mass of sludge, in grams (g); t is the
35、time of experiment, in seconds (s). Record the following data obtained for each test: a) Adimensional mass of filtrate recovered at t = 30 s, t = 90 s and at the end of the test; b) Time necessary to collect a volume of filtrate corresponding to 50 % of the water content of the sludge; c) Dryness of
36、 the cake retained on the filtering medium; d) Dry mass of suspended solids per unit volume of filtrate. NOTE The optimal operating conditions of the drainage process are those for which the drainage is the fastest to remove the maximal drainable quantity of water, the mass of wet and dry solids ret
37、ained on 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 at least the following information: a) Reference to this document; b) Identification of the sludge (origin, type, identification, concentration, meth
38、od of sampling and storage); c) Identification of the flocculation conditions and preparation; d) Characteristics of sludge and filtering medium (initial mass and water content of sludge, reference and supplier of the filtering medium); e) Adimensional mass recovered versus time with at least the vo
39、lume of filtrate collected at t = 30 s, at t = 90 s and at the end of the test; f) Time, in seconds (s), corresponding to the collection of 50 % of the initial water content of the sludge; g) Dry mass of the suspended solids per unit volume of filtrate (in milligrams per litre (mg/l); h) Dryness (ma
40、ss fraction in percent (%) of sludge cake retained on the filtering medium; i) Any detail not specified in this document or which are optional and any other factor which may have affected the results. DIN EN 14701-4:2010-05 EN 14701-4:2010 (E) 8 10 Precision Full results of validation trials, which
41、three types of sludge (i.e. digested sewage sludge, raw sewage sludge, and waterworks sludge) were used for, are reported in informative Annex C . All sludge types considered, average values of relative repeatability standard deviation were 4,6 % for adimensional mass of filtrate at 30 s, 3,5 % for
42、adimensional mass of filtrate at 90 s, 2,0 % for adimensional mass of filtrate at test end, 20 % for the time to collect 5/10 of sludge water content, 1,8 % for dryness of cake, and 14 % for suspended matter in the filtrate. Minimum value was 1,4 % for dryness of cake of both digested sewage sludge
43、and waterworks sludge, while maximum one was 22 % for the time to collect 5/10 of water content of digested sewage sludge. All sludge types considered, average values of relative reproducibility standard deviation were 4,3 % for adimensional mass of filtrate at 30 s, 3,2 % for adimensional mass of f
44、iltrate at 90 s, 2,6 % for adimensional mass of filtrate at test end, 20 % for the time to collect 5/10 of sludge water content, 2,3 % for dryness of cake, and 31 % for suspended matter in the filtrate. Minimum value was 1,0 % for adimensional mass of filtrate at test end of digested sewage sludge,
45、while maximum one was 37 % for suspended matter in the filtrate of raw sewage sludge. At least the precision data given as averages should be reached in the analysis of sludges. DIN EN 14701-4:2010-05 EN 14701-4:2010 (E) 9 Annex A (informative) Typical gravity drainage cell Key 1 Cylindrical tube in
46、 transparent material 2 Filtering medium 3 Tightening device with sealing joint 4 Filtrate draining device 5 Filtrate collector (beaker) 6 Weighing balance 7 Computer Figure A.1 Gravity drainage cell DIN EN 14701-4:2010-05 EN 14701-4:2010 (E) 10 Annex B (informative) Quantity of sludge in a gravity
47、belt filtration The ratio of the mass of sludge to be deposited per unit surface area of the filter cloth AM0can be calculated from the characteristics of the industrial equipment, using Equation (A.1): +=bpb0SLQQAM(A.1) where M0is the mass of sludge poured in the cell, in kilograms (kg); A is the c
48、ell area, in square metres (m2); Qbis the sludge flow rate feeding the industrial equipment, in kilograms per second (kg/s); Qpis the polymer flow rate feeding the industrial equipment, in kilograms per second (kg/s); L is the belt width, in metres (m); Sbis the belt velocity, in metres per second (
49、m/s). If the characteristics of the industrial equipment are unknown, the quantity of sludge poured shall be able to build a cake whose height ranges from 1 cm to 3 cm. DIN EN 14701-4:2010-05 EN 14701-4:2010 (E) 11 Annex C (informative) Results of validation trials Because the circulation of samples of real sludge high in organic content is not possible due to problems associated to changes in their physical characteristics during handling and transportation, the “Modified Ro
