HD Q-PAC

1. This media is acid resistant, lightweight, easy to handle and rigid enough to walk on.
2. It can be stacked to any depth
3. Trickling biofilter can be made taller rather than wider – saving space
4. It provides 1060 m² of plastic surface per m³ of packing
5. It has high void fraction (open area), so that even when coated with a layer of biofilm, it still presents a much lower resistance to air flow.
6. It make it possible to treat air at higher superficial velocities
7. Lower fan power and pump requirements
   
   

   Air flow	1 200 m3/hr
   Tower dims	1200 x 1200 mm
   Packing type	HD Q-Pac
   Height of Packing	3 000 mm
   Sump Capacity	1 200 liters
   Needles	Vertical
   pH	> 2
   Feed rate	1 500 liters per day
   Circulation rate	24 m3/hr
   Removal efficiency	> 95 %

   
   

   Biotrickling Filters

   Controlling H₂S and other odour emissions is major issue for WWTP. H₂S can be reduced to very low levels by wet scrubbing using NaOH and NaOCL. However the storage, metering and control equipment all add to the cost of a scrubber. The chemicals are hazardous, and the amounts required to treat H₂S are quite high, so the cost of operating the scrubber can add up quickly.

   One way to cut cost of chemicals is to utilize microorganisms to break down most of the H₂S using oxygen from the air.

   Using microorganisms to remove odour and Volatile Organic Compound (VOC) from the air streams is not a new idea. Bio-filtration has been used for many years. The key is to provide an ideal habitat for the growth of sulphur oxidizing bacteria to the exclusion of competing microbes which normally predominate in aerobic treatment processes.

   Conventional biolfilters using this type of media often need a caustic scrubber as pre-treatment to humidify the inlet air stream and remove sulphur compounds.

   To eliminate the need for pretreatment of the air or periodic replacement of the degraded media, biofilters can be built using acid resistant inorganic substrate such as porous lava rock.

   These are referred to as “Trickling Biofilters” or “Biotrickling Filters” because the media is kept wet - regardless of the humidity – by continuous circulation of water.

   However the weight of the rock makes it difficult to handle and limits the depth of the filter bed. The fan power required to force the air through the bed is also quite high. As a result biofilters using rock media must be sized for low velocities, resulting in huge footprints.