EN 14701-4:2010

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Charakterisierung von Schlämmen - Filtrationseigenschaften - Teil 4: Bestimmung der Entwässerbarkeit geflockter SchlämmeCaractérisation des boues - Propriétés de filtration - Partie 4: Détermination de l'aptitude a l'égouttage des boues floculéesCharacterization of sludges - Filtration properties - Part 4: Determination of the drainability of flocculated sludges13.030.20Liquid wastes. SludgeICS:Ta slovenski standard je istoveten z:EN 14701-4:2010SIST EN 14701-4:2010en,fr,de01-julij-2010SIST EN 14701-4:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14701-4
January 2010 ICS 13.030.20 English Version
Characterization of sludges - Filtration properties - Part 4: Determination of the drainability of flocculated sludges
Caractérisation des boues - Propriétés de filtration - Partie 4: Détermination de l'aptitude à l'égouttage des boues floculées
Charakterisierung von Schlämmen - Filtrationseigenschaften - Teil 4: Bestimmung der Entwässerbarkeit geflockter Schlämme 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 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, 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 CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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 United Kingdom.
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Typical gravity drainage cell . 9Annex B (informative)
Quantity of sludge in a gravity belt filtration . 10Annex C (informative)
Results of validation trials . 11Bibliography . 15 SIST EN 14701-4:2010

Filtration properties, consists of the following parts:  Part 1: Capillary suction time (CST)  Part 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, Croatia, 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. SIST EN 14701-4:2010

a) storm water handling; b) urban wastewater collecting systems; c) urban wastewater 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 indispensable 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 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 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 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. SIST EN 14701-4:2010

d) Record the cumulative mass of filtrate collected over time every 0,5 s at least during the 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) Repeat steps a) to f) for at least twice if repeatability measurements are needed. SIST EN 14701-4:2010

()tfMM=0 where M is the mass of filtrate, in grams (g); M0 is the initial mass of sludge, in grams (g); t is the 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 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 retained 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, method 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 volume 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 (mass 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. SIST EN 14701-4:2010

for 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 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 filtrate 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, 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. SIST EN 14701-4:2010

Typical gravity drainage cell
Key 1 Cylindrical tube in transparent material 2 Filtering medium 3 Tightening device with sealing joint 4 Filtrate draining device 5 Filtrate collector (beaker) 6 W
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