BIOTRICKLING FILTER PDF
KCH designs and manufactures a Biotrickling Filter System to remove high levels of hydrogen sulfide (H2S) gas and other odors from municipal and industrial. KCH Engineered Systems designs and manufactures a Biotrickling Filter System to remove high levels of hydrogen sulfide (H2S) gas and other. A biotrickling filter is a combination of a biofilter and a bioscrubber. The process of biotrickling filtration is, as is also the case with biofilters and bioscrubbers.
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A biotrickling filter is a combination of a biofilter and a bioscrubber. The bacteria responsible for decomposition are immobilised on a carrier or filter material.
The filter material consists of synthetic foam, lava or a structured plastic packing. The surface must have a structure that allows biomass to bond to it effectively.
The carrier material is constantly covered with water. This mean that water must be uniformly sprayed over the packing. The polluted components absorb in the liquid film and are decomposed by the bacteria. In order to feed the biomass, the required nutrients are added to the water. The scrubbing liquid which is circulated over the packing must be checked for pH, nutrients and salt concentration.
The pH can be continuously measured and corrected. The nutrients are constantly dosed and dosage is periodically checked via analyses. In order to keep salt concentrations within acceptable limits, one section must be discharged and filled with filtr water.
This can take place on the basis of conductivity. To safeguard the process, a temperature measurement can be taken for flue gases, if there is a likelihood of temperatures exceeding required limits. This will help to spare the biotrickling filter.
In the biotrickling filter, the packing may become blocked due to strong growth in the biofilm. This will lead to prefered flows, which will in-turn reduce efficiency and increase pressure drop. If the blockage is too severe, the packing will have to be replaced.
During dimensioning biotrckling is important to set the load at a modest level in order to avoid such blockages. For the removal of H 2 S, one can acidify the biotrickling filter to a pH of 1 — 2without negatively effecting removal efficiency.
This will allow alkaline usage to be limited. If the company has a filtrr for low concentrations of impure sulphuric acid, for neutralisation of waste water for example, this acid could be considered. The discharged sludge must be carried away.
Quantity is determined by the load and composition of flue gases.
In addition to sludge, discharge water is also formed and must be treated or released into sewers. One must be careful when buffering spray water.
When storage is low, anaerobic circumstances may arise and cause odour. It is important to pass odour-laden gases from the storage place through the biotrickling filter or another air purification device. Because water storage normally takes place under the trickling filter, this does not normally pose any problems.
Only a small recirculation pump is need for vaporisation water. Most usage can be attributed to the ventilator. The pressure drop over the filter is 1 — 10 mbar. The filter will be divided into two parts.
Biotrickling Filters | KCH Services Inc.
This phase may become acidic. Skip to main content. Auxiliary materials Nutrients to feed bacteria Suppletion water to compensate for discharge and vapour losses.
Chemicals for pH correction. Environmental aspects The discharged sludge must be carried away. VAT Case study 3: Optimieren der biologischen abluftreinigung VDI Van de Meulebroecke1, P.