BS EN 12913-2012 pdf download.Products used for treatment of water intended for human consumption Powdered diatomaceous earth.
This BS EN 12913 is applicable to powdered dlatomaceous earth used for treatment of water intended for human consumption. It describes the characteristics of powdered diatomaceous earth and specifies the requirements and the corresponding test methods for powdered diatomaceous earth and gives Information on its use in water treatment. It also determines the rules relating to safe handling and use of powdered diatomaceous earth (see Annex B).
2 Normative references
The following documents, in whole or in part, are normatively referenced In this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 12901:1999. Products used for treatment of water intended for human consumption — Inorganic supporting and filtering materials — Definitions
EN 12902, Products used for treatment of water intended for human consumption — Inorganic supporting and filtering materials — Methods of test
3 Terms, definitions and symbols
For the purposes of this document, the terms, definitions and symbols given in EN 12901:1999 apply.
4 Description
4.1 Identification
4.1.1 Chemical name
Not applicable.
4.1.2 Synonym or common names
Diatomite, Kieselguhr. Diatomaceous earth, Calcined diatomite. Flux calcined diatomite.
4.1.3 Chemical formula
Not applicable.
4.1.4 CAS Registry numbers 1)
5.1 Appearance
The product is a white (flux calcined), pink (calcined), or white to green (natural), powder.
5.2 Particle size distribution
5.2.1 Particle size
A mass fraction of at least 95 % shall have a particle size less than 1 000 pm.
NOTE Other values can be necessary for certain applications, The particle size distribution is commonly specified as a mass fraction of 95 % less than a given partide size.
The particle size distribution shall be within the manufacturer’s declared values.
5.2.2 UniformIty coefficient Not relevant.
5.2.3 Oversize and undersize particles
The proportion of oversize and undersize particles shall be within the manufacturer’s declared values.
5.3 Density — bulk density packed
3 3
The bulk density packed shall be in the range of 150 kg/rn to 550 kg/rn
6 Chemical properties
This European Standard specifies the minimum purity requirements for powdered diatomaceous earth used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. Depending on the raw material and the manufacturing process other impurities may be present and, If so, this shall be notified to the user and when necessary to relevant authorities.
Users of this product should check the national regulations in order to clarify whether it is of appropriate purity for treatment of water intended for human consumption, taking into account raw water quality, contents of other impurities and additives used in the products not stated in this product standard.
Limits have been given for impurities and chemical parameters where these are likely to be present in significant quantities from the current production process and raw materials. If the production process or raw
After filling, washing and commissioning of a filter system producing drinking water, powdered diatomaceous earth should not increase the concentrations of chemical parameters (see (1)).
NOTE Water extractable substances, determined in accordance with the method for powdered materials given in EN 12902. can be used to estimate the leaching of the chemicals speofled In EN 12902.
7 Specific properties
The permeability shall be within 15% of the manufacturer’s declared value and the cake density shall be within 5 % of the manufacturer’s declared value.
8 Test methods
8.1 Sampling
Prepare the laboratory sample(s) required by the relevant procedures described in EN 12902.
8.2 Analysis
8.2.1 Particle size distribution
The particle size distribution shall be determined in accordance with EN 12902.
8.2.2 Bulk density packed
The bulk density packed shall be determined in accordance with EN 12902.
8.2.3 Content of silica
The content of silica shall be determined in accordance with EN 12902.
8.2.4 Mass loss at 150 °C
The mass loss at 150 °C shall be determined using the method for water content described in EN 12902 using a temperature of (150 ± 5) C.
8.2.5 Permeability.BS EN 12913-2012 pdf download.