I.S. EN 12255-13:2002
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
WASTEWATER TREATMENT PLANTS - PART 13: CHEMICAL TREATMENT - TREATMENT OF WASTEWATER BY PRECIPITATION/FLOCCULATION
Hardcopy , PDF
20-07-2023
English
01-01-2002
For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
Only cited Standards give presumption of conformance to New Approach Directives/Regulations.
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 General
4.2 Chemical background and process options
4.2.1 Chemical process
4.2.2 Precipitation processes
4.2.3 Selection of precipitation chemicals
4.3 Storage of chemicals
4.3.1 General
4.3.2 Aluminum salts
4.3.3 Iron salts
4.3.4 Calcium salts
4.4 Dosing equipment
4.4.1 General
4.4.2 Aluminium salts
4.4.3 Iron salts
4.4.4 Calcium salts
4.5 Silos and tanks
4.6 Mixing systems
4.7 Flocculators
4.8 Sedimentation tanks
4.8.1 General
4.8.2 Design considerations
4.8.3 Chemical sludge wasting
4.9 Flotation
4.10 Physical filtration
4.11 Sludge
4.11.1 Sludge production
4.11.2 Sludge characteristics
Annex A (normative) Precipitation chemicals
A.1 Aluminium salts
A.2 Iron salts
A.2.1 Ferrous salts
A.2.2 Ferrous sulphate, monohydrate
A.2.3 Ferrous sulphate, heptahydrate
A.2.4 Ferric salts
A.3 Calcium salts
A.3.1 General
A.3.2 Calcium oxide
A.3.3 Calcium hydroxide
Bibliography
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