Filter sand for water supply
The filtered sand must be able to be filtered and washed in the filtration pond in a stable and efficient manner, and must comply with the regulations of 1.1 main component, 1.2 quality (physical properties) and 1.3 quality (leaching property).
1. Main component and quality
1.1 Main component
The main component of the filtered sand is silicic acid, which is naturally produced silica sand.
1.2 Quality (physical properties)
Quality (physical properties) shall be tested according to JWWA A 103-1: 2006-2 6.4.1-6.4.5 and shall comply with the provisions of Table 1.
1.3 Quality (exudability)
Quality (exudability) shall be tested according to JWWA A 103-1: 2006-2 6.5 and shall comply with the provisions of Table 1.
● Table 1-Quality
|item||Quality regulations||Applicable test clause|
|Physical properties||Cleaning turbidity (degree)||30 or less||JWWA A 103-1:6.4.1|
|density (g/cm3)||2.57 ～ 2.67||JWWA A 103-1:6.4.2|
|Ignition weight loss (%)||1.3 or less||JWWA A 103-1:6.4.3|
|Abrasion rate (%)||3.0 or less||JWWA A 103-1:6.4.4|
|Hydrochloric acid solubility (%)||3.5 or less||JWWA A 103-1:6.4.5|
|Exudative||taste||Not abnormal||JWWA A 103-1:6.5|
|Saturation (degree)||0.5 or less|
|Turbidity (degree)||0.2 or less|
|Iron and its compounds (mg/L)||0.03 or less|
|Manganese and its compounds (mg/L)||0.005 or less|
2. Appearance and dimensions
Appearance must be tested in accordance with JWWA A 103-1: 2006-2 6.6.1 and comply with the provisions of Table 2 and the requirements set by the purchaser.
The dimensions shall be tested according to JWWA A 103-1: 2006-2 6.6.2 for each of the rapid and slow sand filters and shall comply with the provisions of Table 2 and the requirements set by the purchaser.
● Table 2-Appearance and dimensions
|item||Appearance and dimensions||Applicable test clause|
|Filtration sand for rapid use||Slow sand filter|
|appearance||appearance||Low content of impurities, flat or fragile sand and iron sand, etc.||Low content of impurities, flat or fragile sand and iron sand, etc.||JWWA A 103-1:6.6.1|
|Size||Effective diameter (mm)||0.45 ～ 0.70||0.30 ～ 0.45||JWWA A 103-1:6.5.2|
|Equal coefficient||1.7 or less||2.0 or less|
|Maximum diameter (mm)||2.0 or less||2.0 or less|
|Minimum diameter (mm)||0.3 or more||0.18 or more|
Quote: Japan Water Works Association Standard JWWA Water Supply Filter Material A-103: 2006-2
Revised on March 30, 2006
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