SIST EN 12255-13:2003
(Main)Wastewater treatment plants - Part 13: Chemical treatment - Treatment of wastewater by precipitation/flocculation
Wastewater treatment plants - Part 13: Chemical treatment - Treatment of wastewater by precipitation/flocculation
This European Standard gives the application, procedure and specifies the requirements for chemical treatment of wastewater for removal of phosphorous and suspended solids. Differences in wastewaste treatment throughout Europe have led to a variety of practices being developed. This Standard gives fundamental informations about the practices; this Standard has not attempted to specify all available practices.
Kläranlagen - Teil 13: Chemische Behandlung - Abwasserbehandlung durch Fällung/Flockung
Diese Europäische Norm zeigt das Einsatzgebiet und das Verfahren der chemischen Behandlung von Abwasser zur Phosphatelimination und zur Abscheidung suspendierter Stoffe auf und legt die Anforderungen an dieses Verfahren fest. Die Unterschiede in Planung und Bau von Kläranlagen in Europa haben zu einer Vielzahl von Verfahrensweisen geführt. Diese Norm enthält grundsätzliche Angaben zu den Verfahrensweisen; sie beschreibt jedoch nicht alle Einzelheiten jeder Verfahrensweise.
Stations d'épuration - Partie 13: Traitement chimique - Traitement des eaux usées par précipitation/floculation
La présente Norme européenne définit les exigences relatives au traitement chimique des eaux usées par précipitation/floculation dans le but d'en éliminer le phosphore et les matieres solides en suspension.
L'application des polymeres n'est pas décrite dans la présente Norme européenne.
Les différences qui existent dans le traitement des eaux usées d'un pays européen a l'autre ont conduit a la mise au point de pratiques variées. La présente norme donne des informations de base sur ces pratiques ; elle n'est pas destinée a spécifier toutes les pratiques disponibles.
Des informations détaillées complémentaires de la présente norme sont disponibles dans la bibliographie.
Čistilne naprave za odpadno vodo - 13. del: Kemijsko čiščenje odpadnih vod z obarjanjem/kosmičenjem
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.REDUMDQMHPNRVPLþHQMHPKläranlagen - Teil 13: Chemische Behandlung - Abwasserbehandlung durch Fällung/FlockungStations d'épuration - Partie 13: Traitement chimique - Traitement des eaux usées par précipitation/floculationWastewater treatment plants - Part 13: Chemical treatment - Treatment of wastewater by precipitation/flocculation13.060.30Odpadna vodaSewage waterICS:Ta slovenski standard je istoveten z:EN 12255-13:2002SIST EN 12255-13:2003en01-oktober-2003SIST EN 12255-13:2003SLOVENSKI
STANDARD
SIST EN 12255-13:2003
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12255-13December 2002ICS 13.060.30English versionWastewater treatment plants - Part 13: Chemical treatment -Treatment of wastewater by precipitation/flocculationStations d'épuration - Partie 13: Traitement chimique -Traitement des eaux usées par précipitation/flocculationKläranlagen - Teil 13: Chemische Behandlung -Abwasserbehandlung durch Fällung/FlockungThis European Standard was approved by CEN on 1 November 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12255-13:2002 ESIST EN 12255-13:2003
EN 12255-13:2002 (E)2ContentspageForeword.31Scope.42Normative references.43Terms and definitions.44Requirements.54.1General.54.2Chemical background and process options.54.2.1Chemical process.54.2.2Precipitation processes.64.2.3Selection of precipitation chemicals.74.3Storage of chemicals.74.3.1General.74.3.2Aluminum salts.84.3.3Iron salts.84.3.4Calcium salts.84.4Dosing equipment.84.4.1General.84.4.2Aluminium salts.94.4.3Iron salts.94.4.4Calcium salts.94.5Silos and tanks.104.6Mixing systems.104.7Flocculators.104.8Sedimentation tanks.104.8.1General.104.8.2Design considerations.104.8.3Chemical sludge wasting.104.9Flotation.104.10Physical filtration.114.11Sludge.114.11.1Sludge production.114.11.2Sludge characteristics.11Annex A (normative)
Precipitation chemicals.12A.1Aluminium salts.12A.2Iron salts.12A.2.1Ferrous salts.12A.2.2Ferrous sulphate, monohydrate.12A.2.3Ferrous sulphate, heptahydrate.12A.2.4Ferric salts.12A.3Calcium salts.13A.3.1General.13A.3.2Calcium oxide.13A.3.3Calcium hydroxide.13Bibliography.14SIST EN 12255-13:2003
EN 12255-13:2002 (E)3ForewordThis document (EN 12255-13:2002) has been prepared by Technical Committee CEN /TC 165 "Waste waterengineering", the secretariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by June 2003, and conflicting national standards shall be withdrawn at the latest byJune 2003.It is the thirteenth part prepared by the Working Groups CEN/TC 165/WG 42 and 43 relating to the generalrequirements and processes for wastewater treatment plants for a total number of inhabitants and populationequivalents (PT) over 50. The parts of the series are as follows:¾ Part 1: General construction principles¾ Part 3: Preliminary treatment¾ Part 4: Primary settlement¾ Part 5: Lagooning processes¾ Part 6: Activated sludge process¾ Part 7: Biological fixed-film reactors¾ Part 8: Sludge treatment and storage¾ Part 9: Odour control and ventilation¾ Part 10: Safety principles¾ Part 11: General data required¾ Part 12: Control and automation¾ Part 13: Chemical treatment - Treatment of wastewater by precipitation/flocculation¾ Part 14: Disinfection¾ Part 15: Measurement of the oxygen transfer in clean water in activated sludge aeration tanks¾ Part 16: Physical (mechanical) filtration 1)NOTEFor requirements on pumping installations at wastewater treatment plants, provided initially as part 2 "Pumpinginstallations for wastewater treatment plants", see EN 752-6 "Drain and sewer systems outside buildings — Part 6: Pumpinginstallations.The parts EN 12255-1, EN 12255-3 to EN 12255-8 and EN 12255-10 and EN 12255-11 were implementedtogether as a European package (Resolution BT 152/1998).WARNING — The use of this European Standard may involve hazardous materials, operations andequipment. This European Standard does not purport to address all of the safety problems associated withits use. It is the responsibility of the user of this European Standard to establish appropriate safety andhealth practices and determine the applicability of regularity limitations prior to use (see also EN 12255-10).Annex A is normative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,Sweden, Switzerland and the United Kingdom.
1)in preparationSIST EN 12255-13:2003
EN 12255-13:2002 (E)41 ScopeThis European Standard specifies the requirements for chemical treatment of wastewater byprecipitation/flocculation for removal of phosphorus and suspended solids.The application of polymers is not described in this European Standard.Differences in wastewater treatment throughout Europe have led to a variety of practices being developed. Thisstandard gives fundamental information about the practices; this standard has not attempted to specify all availablepractices.Detailed information additional to that contained in this standard may be obtained by referring to the bibliography.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 752-6, Drain and sewer systems outside buildings — Part 6: Pumping installations.EN 1085:1997, Wastewater treatment — Vocabulary.EN 10088-2, Stainless steels — Part 2: Technical delivery conditions for sheet/plate and strip for general purposes.EN 12255-1, Wastewater treatment plants — Part 1: General construction principles.EN 12255-6, Wastewater treatment plants — Part 6: Activated sludge process.EN 12255-11, Wastewater treatment plants — Part 11: General data required.EN 12518:2000, Chemicals used for treatment of water intended for human consumption — High-calcium lime.3 Terms and definitionsFor the purposes of this European Standard, the terms and definitions given in EN 1085:1997 and EN 12518:2000and the following apply.3.1chemical treatment of wastewatertreatment of wastewater by chemical coagulation/precipitation with metal salts (including lime) or organic polymersin order to remove inorganic and organic phosphorus compounds and suspended solids and colloidsSIST EN 12255-13:2003
EN 12255-13:2002 (E)54 Requirements4.1 GeneralChemical treatment of wastewater can be divided into two processes: a reaction phase, that consists ofprecipitation of dissolved phosphates, destabilisation of colloids and the formation of flocs, and a separation phase,in which the flocs are separated from the water.The reactors and floc separators (sedimentation tanks, flotation units etc.) for the chemical treatment can beintegrated with the other parts of the wastewater treatment plant (pre-precipitation, simultaneous precipitation, see4.2.2.2 and 4.2.2.3) or be a separate part of the treatment plant (post precipitation, direct precipitation).The water level in the chemical reactors and tanks may be controlled by fixed or adjustable weirs. It is particularlyimportant where there are multiple parallel reactors.The design of the process shall take into account variations in flow and load as stipulated in EN 12255-1 andEN 12255-11.4.2 Chemical background and process options4.2.1 Chemical processIn order to obtain coagulation/precipitation a cationic chemical has to be added to the wastewater. Most commonlythis is a salt of aluminium or iron. Lime may also be used. If only coagulation (removal of particles) is aimed at, acationic polymer may be added alone or in addition to a metal salt.Phosphorus can be present in the wastewater in the following forms:a) organically bound phosphorus,b) inorganic phosphorus,¾ polyphosphate,¾ orthophosphate.Polyphosphates are eventually converted to orthophosphates and the organically bound phosphorus is convertedto orthophosphate during biological treatment.In primary treatment, phosphorus fixed to settleable particles is removed (5 % to 15 % of the total influentphosphorus depending on the character of the wastewater). In the biological treatment a certain amount ofphosphorus is consumed at the microbial synthesis of new cellular material (10 % to 30 % of the influentphosphorus). By introducing an anaerobic stage where volatile fatty acids are produced and phosphates arereleased an increased biological removal of total phosphorus can be reached without addition of chemicals(60 % to 90 % of the influent concentration).In the chemical precipitation, a precipitation agent (such as aluminium sulphate, ferrous sulphate, ferric chloride orcalcium hydroxide) is added to the wastewater. The orthophosphate phosphorus is precipitated as metal-orthophosphate. Al3+ and Fe3+ also form colloidal hydroxides. The solubility of the precipitates is pH-dependent.Organic polyelectrolytes are used as flocculation agents for colloidal and suspended matter.Chemical coagulation/precipitation can be carried out in six different ways, namely¾ direct precipitation,¾ pre-precipitation,SIST EN 12255-13:2003
EN 12255-13:2002 (E)6¾ simultaneous precipitation,¾ post-precipitation,¾ multipoint precipitation,¾ precipitation on filter
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