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The following table outlines the Process, Advantage and Limitation of various Air Pollution Control Systems. Most are conventional methods commonly used.

Examples of new Pacific Rim GREEN BACT technology are highlighted in green.

ABATEMENT PROCESS CHARACTERISTICS
PROCESS ADVANTAGE LIMITATION
COUNTER CURRENT PACKED BED SCRUBBERS IDEAL FOR REMOVAL OF WATER SOLUBLE COMPOUNDS LIKE SULFIDES AND ACID FUMES

MOST EFFECTIVE PACKED SCRUBBER DESIGN
PACKING CLOGS DUE TO PARTICULATE AND PRECIPITATION
FINE MIST SCRUBBERS
IDEAL FOR REMOVAL OF WATER SOLUBLE COMPOUNDS LIKE SULFIDES AND ACID FUMES
NO PACKING TO CLOG - IDEAL IN AIR WITH HIGH PARTICULATE
USEFUL IN PARTICULATE REMOVAL
REQUIRES COMPRESSED AIR TO CREATE SMALL WATER DROPLETS
BIOSCRUBBER / BIOFILTER WITH FINE MIST PRE-TREATMENT AND AEROBIC DIGESTER
TYPICALLY USED FOR TREATMENT OF FOUL AIR WITH WATER SOLUBLE VOC'S AND HIGH PARTICULATE LOADING
RECYCLES ITS OWN BIOMASS REDUCES OPERATING COST
NO NEED TO TREAT LEACHATE
ALL THREE PROCESSES WORK TOGETHER SYMBIOTICALLY IN A WAY THAT REDUCES OPERATING COST, INCREASES EFFICIENCY AND REDUCES OVERALL EQUIPMENT COST
REDUCES OPERATING COST
NO NEED TO TREAT LEACHAT
HIGHER EQUIPMENT COST THAN CONVENTIONAL BIOFILTER
(This is offset tenfold by lower future operating costs.)
CO-CURRENT PACKED BED SCRUBBERS USED FOR REMOVAL OF WATER SOLUBLE COMPOUNDS LIKE SULFIDES AND ACID FUMES

INTERMEDIATE STAGE BETWEEN TWO COUNTER CURRENT SCRUBBER STAGES IN A MULTIPLE STAGE TREATMENT CONFIGURATION
LIMITED REMOVAL EFFICIENCY

INCREASED CLOGGING POTENTIAL
CROSS-FLOW PACKED BED SCRUBBERS USED FOR REMOVAL OF WATER SOLUBLE COMPOUNDS LIKE SULFIDES AND ACID FUMES USED WHERE HEIGHT IS A LIMITING CONSIDERATION WHEN IMPROPERLY MAINTAINED, IT HAS A GREATER POTENTIAL TO ALLOW AIR TO PASS THROUGH WITH OUT BEING TREATED
COARSE MIST SCRUBBERS USEFUL FOR FIRE ABATEMENT AND GAS STREAM COOLING MARGINALLY USEFUL FOR REMOVAL OF WATER SOLUBLE COMPOUNDS
CARBON (OR OTHER SUBSTRATE) ADSORBER REMOVES A WIDE RANGE OF COMPOUNDS

EFFICIENCY CAN BE IMPROVED BY IMPREGNATION WITH OTHER COMPOUNDS LIKE:

  • SODIUM HYDROXIDE
  • POTASSIUM PERMANGANATE
  • SULFURIC ACID
  • PHOSPHORIC ACID
  • POTASSIUM CARBONATE
  • IRON OXIDE
  • POTASSIUM IODIDE
  • TRIETHYLENE DIAMINE (TEDA)
  • SULFUR
  • SILVER
  • ZINK OXIDE
  • MERCURY CHLORIDE
  • ZINK ACETATE
  • NOBLE METALS
CARBON MUST BE PERIODICALLY REGENERATED OR REPLACE

MOISTURE IN THE AIRSTREAM CLOGS THE CARBON

WHEN SATURATED WITH ORGANICS IT MUST BE COOLED BY CONTINUOUS AIR FLOW OR IT WILL SPONTANEOUSLY COMBUST
VENTURI TYPICALLY USED TO ENTRAIN WATER SOLUBLE GAS LIKE CHLORINE INTO LIQUID STREAM HIGH OPERATIONAL COSTS
FLAIR WIDE RANGE OF APPLICATIONS TYPICALLY EXPENSIVE TO OPERATE IF ADDITIONAL FUEL IS REQUIRED TO MAINTAIN COMBUSTION
REGENERATIVE THERMAL OXIDIZER WIDE RANGE OF APPLICATIONS TYPICALLY EXPENSIVE TO OPERATE IF ADDITIONAL FUEL IS REQUIRED TO MAINTAIN COMBUSTION

SUBJECT TO OXIDATION BY CORROSIVE COMPOUNDS IN GAS STREAM
REGENERATIVE THERMAL OXIDIZER BED TYPE BIOSCRUBBER / BIOREACTOR TYPICALLY USED FOR TREATMENT OF FOUL AIR WITH LOW VOLATILE ORGANIC COMPOUND (VOC) OR SULFIDE CONCENTRATIONS

SEE DETAILED LIST OF VOC'S IN TABLE OF COMPOUNDS
REQUIRES LARGE LAND AREA

VULNERABLE TO VARIATIONS IN MOISTURE

ORGANIC BEDS HAVE LIMITED LIFE

EASILY CLOGGED BY PARTICULATE OR BIOMASS

LEACHATE FROM BED TYPICALLY REQUIRES TREATMENT PRIOR TO DISPOSAL
BIOSCRUBBER / BIOFILTER IN VESSEL TYPICALLY USED FOR TREATMENT OF FOUL AIR WITH CONSISTENT VOLATILE ORGANIC COMPOUND (VOC) OR SULFIDE CONCENTRATIONS

SMALLER "FOOTPRINT" THAN BED TYPE BIOSCRUBBER
BED CLOGGING CAN OCCUR IF SUBSTRATE SUPPORTING BIOLOGICAL GROWTH IS NOT SIZED CORRECTLY AND MADE OF A MATERIAL THAT IS COMPATIBLE WITH COMPOUND BEING TREATED

VOLCANIC ROCK & OTHER POROUS MINERAL SUBSTRATES ARE SUBJECT TO DECOMPOSITION IN ACID ENVIRONMENTS. THEY ARE EASILY CLOGGED BY PARTICULATE LADEN AIR AND THEY ARE HEAVY REQUIRING ADDITIONAL STRUCTURAL SUPPORT

STRUCTURED PACKING AND OTHER PLASTIC SUBSTRATES MAY BE TOO SMOOTH TO ALLOW BIOLOGICAL GROWTH ATTACHMENT AND MAY HAVE GEOMETRIES THAT PROMOTE CLOGGING

LEACHATE FROM BED TYPICALLY REQUIRES TREATMENT PRIOR TO DISPOSAL
BIOSCRUBBER / BIOFILTER WITH CARBON ADSORBER TYPICALLY USED FOR TREATMENT OF FOUL AIR WITH INCONSISTENT VOLATILE ORGANIC COMPOUND (VOC) OR SULFIDE CONCENTRATIONS

THE CARBON ACTS LIKE A BUFFER TO EVEN OUT THE LOADING ON THE BIOSCRUBBER / BIOFILTER
HIGHER EQUIPMENT COST THAN CONVENTIONAL BIOFILTER

WILL BECOME CLOGGED BY PARTICULATE LADEN AIR

LEACHATE FROM BED TYPICALLY REQUIRES TREATMENT PRIOR TO DISPOSAL
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