BS EN 12255-13:2023 – TC

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Tracked Changes. Wastewater treatment plants – Chemical treatment. Treatment of wastewater by precipitation/flocculation

Published By	Publication Date	Number of Pages
BSI	2023	66

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Categories: 13.060.30 - Sewage water, BSI

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This document specifies the requirements for chemical treatment of wastewater by precipitation/flocculation for removal of phosphorus and suspended solids. The application of polymers is not described in this document. Differences in wastewater treatment throughout Europe have led to a variety of practices being developed. This document gives fundamental information about the practices; this standard has not attempted to specify all available practices. NOTE Chemical treatment can be performed in combination with primary and more commonly with secondary treatment, but it can also be performed as separate tertiary treatment, usually in combination with filtration (see EN 12255-16). Chemical treatment can provide a potential contribution to the circular economy through the recovery of materials, such as phosphorus, from wastewater or sludge.

PDF Catalog

PDF Pages	PDF Title
1	30477638
39	A-30422949
40	undefined
46	1 Scope 2 Normative references 3 Terms and definitions
48	4 Symbols and abbreviations 4.1 Symbols 4.2 Abbreviations
49	5 Requirements 5.1 General 5.2 Regulation 5.3 Phosphorus removal strategies 5.3.1 General
50	5.3.2 Primary treatment 5.3.3 Biological treatment and enhanced biological phosphorus removal 5.3.4 Tertiary treatment 5.4 Design considerations 5.4.1 Chemical
51	5.4.2 Interchangeability 5.5 Chemical background and process options 5.5.1 Chemical process
53	5.5.2 Precipitation processes 5.5.2.1 Pre-precipitation 5.5.2.2 Simultaneous precipitation 5.5.2.3 Post-precipitation 5.5.2.4 Multipoint precipitation
54	5.5.3 Selection of precipitation chemicals
55	5.6 Storage preparation and dosing of chemicals 5.7 Dosing equipment
56	5.8 Silos, tanks and pipes
57	5.9 Mixing 5.10 Control systems for dosing of chemical 5.10.1 General 5.10.2 Flow proportional dosing (FPD)
58	5.10.3 Load proportional dosing
59	5.10.4 Phosphorus load calculation 5.10.5 Other control concepts 5.11 Flocculation reactors
60	5.12 Sedimentation tanks 5.12.1 General 5.12.2 Chemical sludge wasting 5.13 Flotation 5.14 Physical filtration 5.15 Sludge 5.15.1 Sludge production
61	5.15.2 Sludge characteristics
62	Annex A (informative)Precipitation chemicals A.1 Aluminium, calcium and iron salts