The Sanitation Districts of Los Angeles County (Districts) have been using ferrous chloride (FeCl 2 ) to control the hydrogen sulfide (H 2 S) concentration in digester gas at the Joint Water Pollution Control Plant (JWPCP) for over 30 years. Although FeCl 2 has been very effective in controlling digester H 2 S levels, the cost of this chemical has increased significantly in the last few years. Consequently, the Districts initiated a study to investigate the use of biotrickling filters (BTFs) to control digester gas H 2 S. Two pilot-scale biotrickling filters were tested under slightly aerobic and anoxic conditions. Two types of filter media, lava rock and plastic rings, were tested in the aerobic filter, and lava rock was tested in the anoxic filter. Concentrated H 2 S was spiked into the digester gas to simulate elevated H 2 S levels characteristic of lower FeCl 2 doses. For H 2 S levels between 200 and 400 ppm, the aerobic BTF with a plastic ring media was able to reduce H 2 S to below the regulatory limit of 40 ppm at empty bed retention times (EBRT) of 20 to 37 seconds. The aerobic lava rock BTF experienced a clogging problem, and the anoxic lava rock BTF was not able to reduce 200 ppm of H 2 S to below the regulatory limit at an EBRT of 50 seconds.
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