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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Auxiliary materials Nutrients to feed bacteria Suppletion water to compensate for discharge and vapour losses. J Zhejiang Univ Sci B. In order to feed the biomass, the required nutrients are added to the water. Transient response of biotrickling filter to fluctuating H 2 S after re-acclimation.

Increase of biomass in the biotrickling filters during the startup. The biomass decreased slowest in experiment 1, but fastest in experiment 4. Re-acclimation experiments were conducted to investigate the response of these previously acclimated biotrickling filters to starvation periods and evaluate whether the biotrickling filter can recover rapidly and meet the demand of industrial application.

The present research described the results of a bench-scale study investigating the effects of H 2 S starvation and shock loads on biotrickling filter performances. For the removal of H 2 S, one can acidify the biotrkckling filter to a pH of 1 — 2without negatively effecting removal efficiency. KCH offers a non-proprietary nutrient supplement to feed the micro-organisms and water to maintain the optimum pH.

The discharged sludge must be carried away. Biotrickling filter, Starvation, Shock loads, Odor, Hydrogen sulfide. This will help to spare the biotrickling filter. The surface must have a structure that allows biomass biotriclking bond to it effectively.

Biotrickling Filter Systems

Samples were taken at same depth 35 cm from the biotrickling filters described above. Inlet H 2 S concentration was kept biotirckling a relatively high value at the re-acclimation process without ramping up. During dimensioning it is important to set the load at a modest level in order to avoid such blockages. Schematic diagram of biotrickling filter system 1: The pressure drop over the filter is 1 — 10 mbar.


If the company has a use for low concentrations of impure sulphuric acid, for neutralisation of waste water for example, this acid could be considered.

The polluted components absorb in the liquid film and are decomposed by the bacteria. Therefore, the biofilm containing sulfur-oxidizing bacteria was gradually formed on the surface and in the pores of the carriers.

Re-acclimation after the starvation was much faster than the initial startup phase because of the pre-existence of an acclimated process consortium. The Biotrickling Filter uses continues recirculation of a nutrient-rich solution to promote the biological growth.

The dry biomass in the bioreactors was determined by regularly sampling the carrier with biofilm at same depth biotrcikling cm. Nevertheless, these technologies are usually uneconomical because they only transfer waste gases from the gas phase to another phase that either requires the use of further treatments or is expensive to maintain good operation performance.

This phase may become acidic. Periods of interruption may vary from a few minutes, as for lunch breaks, to several days. Performance of biotrickling filter is usually studied under relatively steady-state operation conditions in laboratory systems.

Biotrickling Filters | KCH Services Inc.

Comparing the two experiments, it is noted that airflow is an important contributing factor to the overall biomass loss because of its shear stress and oxidation capacity. One must be careful when buffering spray water. We’ll assume you’re ok with this, but you can opt-out if you wish.

Effects of periods of starvation and fluctuating hydrogen sulfide concentration on biofilter dynamics and performance. The results of the experiment 4 indicate that the endogenous respiration was an important factor to the overall loss of bacterial viability.


Environmental aspects The discharged sludge must be carried away. It is important to investigate the performances of biotrickling filter in the absence of pollutant feed and during the time when shock loads take place. The comparison between experiments 3 and 4 further demonstrates that spray liquid with nutrient solution could keep the activity of microorganism.

Low Empty Bed Retention Time. Re-acclimation processes of four starvation experiments were similar after restarting biotrickling filters. The study suggests that the biotrickling filters were capable of withstanding different conditions of starvation with rapid recovery to high removal efficiency when starvation ceases.

Inlet H 2 S concentration of the bioreactor was not allowed to stabilize in the shock loads experiments, which is similar to the practical concentration produced during industrial operation.

The fact that full activity of sulfur-oxidizing bacteria was recovered suggests that re-acclimation did not require the buildup of significant amounts of new degrading biomass. Plate count Samples were taken at same depth 35 cm from the biotrickling filters described above.

Biotrickling filter | EMIS

Only a small recirculation pump is need for vaporisation water. Can be used as a first stage unit to extend the life of Carbon units. However, in most cases, inlet concentrations and volumetric loads of H 2 S were relatively low and thus shock loads were also relatively mild.

The recovery processes were commenced after a d starvation period. Re-acclimation for H 2 S removal after the starvation.

Biotrickling filter

Liquid from the upper reservoir tank could be sprayed regularly downward through the bioreactor by centrifugal water pump and was discharged from the bottom. Biorrickling of biomass during the starvation As shown in Fig.

Four identical bench-scale biotrickling filters were used Fig. Skip to main content.