|
CONTRAST & COMPARISON |
| |
Manganese Greensand |
DMX-065 |
|
PHYSICAL PROPERTIES |
| Color |
Black |
Black |
| Bulk Density: |
85 lbs/cu. ft |
88.64 lbs/cu. ft |
| Specific Gravity: |
2.4-2.9 |
Specific Gravity: 2.5-2.67 |
| Effective
Size: |
0.30-0.35
mm |
Effective Size:
0.45-0.55 mm |
| Uniform Coefficient: |
1.6 |
Uniform Coefficient: 1.4-1.7 |
| Mesh Size: |
16-60 |
20-45 |
| Attrition Loss Per Year: |
2% |
Attrition Loss Per Year: 1-5%
p/year |
| |
|
CONDITIONS FOR OPERATION |
| Water pH range: |
6.2-8.5 |
5.8-8.6 |
| Maximum water temperature: |
80%F/26.7C |
45C |
| Bed depth: |
760 |
600 mm |
| Freeboard: |
50% of bed depth (min.) |
40% of bed depth (min.) |
|
Regeneration: |
1.5-2 oz
of KmnO4 by Weight per cu. ft. |
Regeneration not required |
| Service flow rate: |
3-5 gpm/sq. ft, 8-10 gpm/sq. ft |
LV 5-30 15 optimal |
| Backwash flow rate: |
10-12 gpm/sq. ft |
10-35 gpm per sq. ft |
| Backwash bed expansion: |
40% of Bed Depth (min.) |
15-30% of Bed Depth (min.) |
| Maximum practical limit of
iron (Fe++) or manganese (Mn++) in raw water: |
15 ppm |
20 ppm |
| Maximum practical limit of
hydrogen sulphide (H2S): |
5 ppm |
5 ppm |
| |
|
CAPACITY PER CU. FT |
| Iron alone :
|
600 grains (10,000 gal. of
water containing 1 ppm iron/cu. ft) |
900 grains (10,000 gal. of
water containing 1 ppm iron/cu. ft) |
| Iron and manganese:
|
400 grains (7,000 gal. of
water containing ½ ppm iron and ½ ppm manganese/cu. ft) |
600 grains (7,000 gal. of
water containing ½ ppm iron and ½ ppm manganese/cu. ft) |
| Hydrogen Sulfide |
175 grains (3,000 gal. of
water containing 1 ppm of hydrogen sulfide/cu. Ft) |
260 grains (3,000 gal. of
water containing 1 ppm of hydrogen sulfide/cu. Ft) |
