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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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Biotrickling filter

Articles from Journal of Zhejiang University. One must be careful when buffering spray water. It should also be noted that a decrease in the biomass was not vital at relatively high biomass concentration. Re-acclimation processes of four starvation experiments were similar after restarting biotrickling filters. The scrubbing liquid which is circulated over the packing must be checked for pH, nutrients and salt concentration.

The increase of biomass was relatively slower compared with initial startup after 15 d, which could attribute to the fact that spray liquid could supply microorganisms with necessary nutrients and wash excess biofilm off. Re-acclimation after the starvation was much faster than the initial startup phase because of the pre-existence of an acclimated process consortium. Changes of biomass during the starvation As shown in Fig. The packed carriers in each section were supported by plexiglass sieve plates.

There was one port in each section of the biotrickling filter for carrier sampling and gas pressure measurement. To safeguard the process, a temperature measurement can be taken for flue gases, if there is a likelihood of temperatures exceeding required limits.

This can take place on the basis of conductivity.

Hydrogen sulfide removal by a novel fixed-film bioscrubber system. Interruptions are also common phenomena in the industrial operation biotrickoing plants are periodically shut down or during equipment malfunctions and equipment repair period. Responses to shock loads after starvation experiment were also discussed under continuous fluctuation concentration conditions.


The biotrickling filters with an inner diameter of mm and a height of mm were made of transparent plexiglass tubing. 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. Instead of chemicals, a simple non-proprietary nutrient is used to promote biological growth on a synthetic media. A biotrickling filter is a combination of a biofilter and a bioscrubber.

In the industrial operation of biotrickling filters for hydrogen sulfide H 2 S removal, shock loads or starvation was common due to fiilter variations or equipment malfunctions. The nutrients are constantly dosed and dosage is periodically checked via analyses. Bioteickling of interruption may vary from a few minutes, as for lunch breaks, to filtrr days.

In order to keep the activity of microorganism and also save energy, air and nutrient solution could be stopped and only supplied at regular intervals, biotricklingg could reduce the time for restart. The removal of malodorous H 2 S has been traditionally accomplished by using physical or chemical technologies, such as vapor scrubbing, incineration, or adsorption Bouzaza et al.

Four experiments were conducted to evaluate the changes of biomass and viable bacteria numbers in the biotrickling filters during a d starvation. Received Mar 1; Accepted Jul 1.

Biotrickling Filters | KCH Services Inc.

Therefore, the bioreactor could meet the demand of industrial operation to resist the shock loads. Hydrogen sulfide adsorption and oxidation onto activated carbon cloths: The airflow rate was kept at 6. Quantity is determined by the load and composition of flue gases. Little is known on the starvation experiments of biotrickling filter for H 2 S removal and a limited number of studies involved actual measurements of biomass and viable bacteria numbers during starvation.

Currently, biological purification technology has become an important alternative to many conventional methods, especially for odor associated with readily biodegradable compounds Jiang et al. On the one hand, the experiments were carried out under the high liquid trickling velocity with 5 L of the nutrient solution, once 1 h in order to avoid the clogging of the bioreactor, which could limit the increase of biomass and further resulted in the decrease of removal capacity in the bioreactor.


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The discharged sludge must be carried away. Cox and Deshusses designed two identical biotrickling filters, one operated at pH 4. The biotrickling filters of experiments 1 and 4 were starved without trickling liquid.

Biotrickling Filters use a synthetic media to support the growth of natural occurring micro-organisms to convert H2S into a dilute acid solution, part of which is discharged via a continuous water make-up or overflow.

A biotrickling filter is, in fact, a three-phase biocatalytic oxidizer and is essentially made from a support carrier on which microorganisms are able to grow when optimal conditions are provided. Solid thiosulphate agar medium was made as follows: This is probably due to the loss of moisture in the biofilm. After the biotrickling filters were inoculated, nutrient solution was added for 20 d to sustain a rapid microbial growth and to improve the degradation activity of sulfur-oxidizing bacteria before the starvation experiments.

The nutrient solution of spray water was as follows: Interruption of H 2 S feed was achieved under selected conditions with or without air flow, with or without spray liquid supply for a duration from 21 to 45 d.

Biotrickling filters are used for applications in which there is no space for a biofilter, where the efficiency of a biofilter is not sufficient, or in the presence of ph-relevant compounds.