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BS EN 12255-6:2023 – TC

BS EN 12255-6:2023 – TC

$258.95

Tracked Changes. Wastewater treatment plants – Activated sludge process

Published By Publication Date Number of Pages
BSI 2023 146
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This document specifies performance requirements for treatment of wastewater using the activated sludge process for plants over 50 PT. The informative Annexes A to W provide design information.

PDF Catalog

PDF Pages PDF Title
1 30477672
81 A-30422430
82 undefined
89 1 Scope
2 Normative references
3 Terms and definitions
90 4 Symbols and abbreviations
4.1 Symbols
92 4.2 Indices (not included in the symbols or abbreviations below)
93 4.3 Abbreviations
94 5 Requirements
5.1 General
95 5.2 Planning
5.2.1 Basic information
96 5.2.2 System selection
100 5.2.3 Biological reactors
5.2.4 Clarifiers
101 5.2.5 Environmental impact
5.3 Detailed Design
5.3.1 Flow-splitting
5.3.2 Biological reactors
102 5.3.3 Mixing
104 5.3.4 Aeration
5.3.4.1 General
105 5.3.4.2 Fine bubble diffuser systems
107 5.3.4.3 Surface aerators (vertical shaft and brush aerators)
108 5.3.4.4 Injectors or ejectors
5.3.5 Secondary clarifiers
110 5.3.6 Return and surplus sludge systems
5.3.7 Internal recirculation
5.3.8 Control and automation
112 6 Test methods
113 Annex A (informative)Design of biological reactors
114 Annex B (informative)Raw wastewater characteristics
115 Annex C (informative)Removal efficiency of primary clarifiers
116 Annex D (informative)External carbon sources
117 Annex E (informative)Sludge age (MSRT) and aerobic sludge age (MASRT)
E.1 System for Carbon Removal only
E.2 Systems for nitrification at minimum 12 °C
E.3 Systems for nitrification and denitrification at minimum 12 °C
E.4 Systems for N removal and simultaneous aerobic sludge stabilization
119 Annex F (informative)Surplus sludge production
121 Annex G (informative)Denitrification capacity
122 Annex H (informative)Oxygen Consumption
124 Annex I (informative)Iterative calculation of the volumetric ratio of denitrification reactors (VDen/VR)
125 Annex J (informative)Reactor volume (VR)
126 Annex K (informative)Internal recirculation ratio (IRR)
127 Annex L (informative)Alkalinity
129 Annex M (informative)Aerobic selectors
130 Annex N (informative)Design based on F/M-ratio
131 Annex O (informative)Sludge volume index (SVI)
132 Annex P (informative)Solids concentration of the return sludge (CTSS,RS)
133 Annex Q (informative)Return sludge flow (QRS) and total suspended solids concentration in the biological reactor (CTSS,R)
Q.1 General
Q.2 Surface flow rate (qA) and surface sludge flow rate (qSV)
135 Annex R (informative)Surface area (ACla) of final clarifiers
136 Annex S (informative)Depth (hCla) of final clarifiers
137 Annex T (informative)Scraper Design
139 Annex U (informative)Return sludge balance
140 Annex V (informative)Influent structures
141 Annex W (informative)Design of a fine bubble aeration system

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BS EN 12255-6:2023 - TC
$258.95