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 | EMIS

Meanwhile, a rapid accumulation of immobilized biomass was observed and there was about 0. B are biotricklig here courtesy of Zhejiang University Press.

The scrubbing liquid which is circulated over the packing must be checked for pH, nutrients and salt concentration. It should also be noted that a decrease in the biomass was not vital at relatively high biomass concentration.

During the subsequent re-acclimation, all the bioreactors could resume high removal efficiencies within 4 d regardless of the biotricklinv starvation conditions. Biofiltration is a pollution control technique using a bioreactor containing living material to capture and biologically degrade pollutants.

Overall, the results show that the bioreactor could meet the demand of industrial operation to resist the shock loads and starvation condition for H 2 S removal. If multiple odor compounds need to be removed, Biotrickling Filters can be combined with other KCH technologies, such as Carbon Adsorbersto create a multi-stage solution for Odor Control. Water, Air and Soil Pollution.

Biotrickling filter

Samples were taken at same depth 35 cm from the biotrickling filters described above. Journal of Colloid and Interface Science.

In order to further study the acclimatization of the bioreactor to shock loads, the bioreactor was supplied with H 2 S of variable concentration after resuming normal operation. One must be careful when buffering spray water.


Instead of chemicals, a simple non-proprietary nutrient is used to promote biological growth on a synthetic media.

Owing to the similarity of the biomass in four bioreactors, only one of the biotrickling filters was evaluated prior to the shock loads. The discharged sludge must be carried away. The filter will be divided into two parts.

Clean air supply was maintained in experiments 3 and 4, but discontinued in experiments 1 and 2. Maximum Resistance to UV Exposure. Liquid from the upper reservoir tank could be sprayed regularly downward through the bioreactor by centrifugal water pump and was discharged from the bottom.

Furthermore, an important implication of these starvation experiments was that significant energy can be saved by shutting the blower and the water pump off during industrial operation, which would not lead to notable adverse effects. Thus the sulfur oxidizing bacteria were enumerated during the starvation experiments.

In addition to sludge, discharge water is also formed and must be treated or released into sewers.

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. 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, which could reduce the time for restart.

Chemicals for pH correction.

Under proper operation, biological process is highly efficient and environmentally friendly. The low operating cost attributes to the utilization of microbial oxidation at ambient conditions instead of thermal or chemical oxidation conditions.

The H 2 S outlet concentration in steady state was maintained below 1. Periods of interruption may vary from a few minutes, as for hiotrickling breaks, to several days. Samples were then filtre into physiological saline solution 0. The carrier material is constantly covered with water. Only a few studies discussed the effects of starvation and shock loads on the performances of biofilters for H 2 S removal. Compared with the biomass, the live bacteria numbers bitrickling a more important parameter for resuming high H 2 S removal efficiency after the starvation.


The recovery processes were commenced after a d starvation period. Four identical bench-scale biotrickling filters were used Fig. There was one port in each section of the biotrickling filter for carrier sampling and gas pressure measurement. Comparison of four different starvation experiments showed that the time for re-acclimation was not obviously affected by the presence or the absence of gas flow or spray liquid. Inlet H 2 S concentration was kept at a relatively high value at the re-acclimation process without ramping up.

Removal of ternary VOCs in air streams at high loads using a compost-based biofilter. The good removal in dealing with these abrupt changes in inlet H 2 S concentration after resuming normal operation suggests that the bioreactor had a strong ability to resist shock loads when it was supplied continuously with H 2 S of variable inlet concentration. Abstract In the industrial operation of biotrickling filters for hydrogen sulfide H 2 S removal, shock loads or starvation was common due to process variations or equipment malfunctions.

KCH offers a non-proprietary nutrient supplement to feed the micro-organisms and water to maintain the optimum pH. Low Empty Bed Retention Time.

Re-acclimation processes of four starvation experiments were similar after restarting biotrickling filters.