|
Duall dry scrubbers
are recommended for applications involving removal of aerosol mists
in situations where minimum water usage is paramount.
Unlike our
other packed bed scrubbers, our dry scrubbers do not rely on water
wash of the media during normal operation. Entrained droplets are
extracted from the air stream and the collected liquid may be returned
to the process tanks.
Periodic washdown
of the media is required to maintain removal efficiency and prevent
fouling. It may be possible to return this liquid to the process
tanks, thus making zero discharge a reality.
|
| TYPICAL
CONTAMINANTS REMOVED |
| •
Chromic acid mists |
•
Cyanide |
| •
Sulfuric acid mists |
•
Phosphoric mists |
| •
Electrolytic nickel mists |
•
Alkaline mists |
|
| INDEPENDENT
SOURCE TEST REPORT |
| Type
of Unit: |
Hexmaster®Composite
Mesh Pad System
– The system treats air vented from five (5) hard chrome
plating tanks. |
| Process
Info: |
Hard
chrome plating
|
| Report
Date: |
July
23, 1997 |
|
Test
Run |
1
|
2
|
3 |
Average |
| Load
(amp-hrs/hr) |
28,520 |
32,740
|
32,600
|
32,287 |
| Stack
Temperature (°F) |
82 |
83
|
81
|
82 |
Exhaust
Gas Velocity (ft/sec)
|
55.22 |
55.11
|
55.11
|
55.15 |
| Static
Pressure, in H2O |
-0.27 |
-0.27 |
-0.27 |
-0.27 |
| Exhaust
Flow Rate (ACFM) |
20,892 |
20,848 |
20,849 |
20,863 |
| Exhaust
Flow Rate (DSCFM) |
20,064 |
19,977 |
20,070 |
20,037 |
| Total
Chromium |
|
|
|
|
|
-
Concentration (mg/m3)
|
0.0010
|
0.0007
|
0.0008
|
0.0008 |
|
-
Emission
Rate (mg/hr)
|
34.95
|
22.08
|
28.44
|
28.49 |
|
-
Emission
(mg/amp-hr)
|
0.0012 |
0.0007 |
0.0009
|
0.0009 |
| Hexavalent
Chromium |
|
|
|
|
|
-
Concentration
(mg/m3)
|
0.0003 |
0.0003 |
0.0004
|
0.0003 |
|
-
EPA
425 Requirements
|
<0.0150 |
<0.0150
|
<0.0150
|
<0.0150 |
|
-
Emission
Rate (mg/hr)
|
11.60
|
9.78
|
13.27
|
11.55 |
|
-
Emission
(mg/amp-hr)
|
0.0004
|
0.0003
|
0.0004
|
0.0004 |
|
-
EPA
425 Requirements
|
<0.0060 |
<0.0060 |
<0.0060
|
<0.0060 |
|
| Results: |
All are less than applicable emission limits of .006 mg CR+6/amp-hr
and .015 mg Cr/dcsm. |
| Procedure: |
Triplicate,
EPA Method 306 |
|
| |
|
