BS 1438:1971
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
Specification for media for biological percolating filters
Hardcopy , PDF
05-03-2004
English
07-09-1971
Important note : Users cannot be edited or removed once added to your Multi user PDF.
Cooperating organizations
Foreword
Media for percolating filters for treatment of water,
sewage and trade effluents
Function of filter medium
Durability
Soundness test
Large material for base of filter
Mechanical properties
Shape of medium
Specification
1. Scope
2. Durability
3. Sizes of medium
4. Shape, nature of surface and classification of
medium
5. Flakiness
6. Cleanness
7. Sampling and testing
8. Supplier's certificate
9. Independent tests
Appendices
A. Method of sampling
B. Method for the determination of soundness
C. Method for the determination of size (sieve
analysis)
D. Shape, nature of surface and classification of
medium
E. Notes on the use of this standard
Tables
1. Grading limits for media (metric)
2. Grading limits for media (imperial)
3. Size of samples
4. Shape of pieces of medium
5. Surface characteristics of filter medium
Figures
1. Typical particle shapes
2. Thickness gauge
Single-sized materials, 63 mm to 14 mm, including coke, clinker, gravel, crushed stone, slag for treatment of water, sewage, trade effluents. Durability; sizes; descriptions of shape, nature of surface and group classification; flakiness, cleanness, sampling and testing; supplier\'s certificate; independent tests. Notes on use appended.
| Committee |
B/502
|
| DocumentType |
Standard
|
| Pages |
32
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy |
| BS 6297:1983 | Code of practice for design and installation of small sewage treatment works and cesspools |
| BS EN 12255-7:2002 | Wastewater treatment plants Biological fixed-film reactors |
| EN 12255-7:2002 | Wastewater treatment plants - Part 7: Biological fixed-film reactors |
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.