Development of an innovative biofiltration system for the treatment of gaseous toluene

Higuchi, Takashi; Uehara, Shinya; Sugiyama, Norikazu

doi:10.2171/jao.37.110

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…In addition to the necessary parameters for biofilter operation such as nutrient supply, the design, and configuration of the reactors help in the development of more reliable biofiltration techniques (Cheng et al 2016;Mudilar et al 2010). Some researchers indicate that periodic changes in gas flow direction lead to improved biofilter performance (Kinney, Loehr, and Corsi 1999), an example of such a system is the Switch-Feed Multi-Column (SFMC) biofilter (Higuchi, Uehara, and Sugiyama 2006). A typical method of nutrient supply in a biotrickling filter is the spraying of liquids containing culture or minerals from the top of the filter bed.…”

Section: Introductionmentioning

confidence: 99%

Influence of phosphorus and trace metals in biofilters treating gaseous VOCs using a novel irrigation system

Mansoori

Ando

Higuchi

2019

Journal of the Air & Waste Management Association

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Although the appropriate supply of nutrients has been extensively researched, more information is required on the effects of nutrients in treating gaseous volatile organic compounds (VOCs) in biofiltration. In this study, the effects of phosphorous and trace metals on gaseous toluene and methyl ethyl ketone (MEK) removal were investigated. The transfer of nutrients from the irrigation liquid to the packed bed, and the consumption and holding amount of nutrients in the packing material were observed during biofiltration. Under conditions of 20-24 s of empty bed residence time, MEK removal was 95% or more in all conditions of the biofiltration reactors, whereas toluene removal was affected by the operating conditions of the reactors. Consumption ratio of phosphorus to carbon was from 1.7 × 10 −4 to 1.1 × 10 −3 in the steady state of VOC removal under the conditions of this study. When gaseous VOC treatment was restarted after nine days of shutdown, a significant decline in toluene removal was observed by the reactor in which phosphorus supply was approximately one fifth of the amount in another reactor. Two types of irrigation systems, soaking and spraying, were compared and soaking irrigation achieved a more even distribution of nutrients held inside the packed bed. Soaking irrigation was expected to lead to higher VOC removal capacity by this distribution effect of nutrients, but toluene removal in the reactor with this irrigation was lower than that in the reactor with spraying irrigation. One of the possible reasons for this was the inhibition of nutrients transfer in the bottom part of the reactor. The trend of transfer in all ingredients from the irrigation liquid to the packed bed was synchronized on the whole; however, this transfer relatively tended to be high in nitrate and sodium and low in ammonium and phosphate.Implications: A major concern about using biofiltration systems to treat VOCs is the uncertainty regarding the appropriate nutrient supply to the filter bed to preserve microbial activity. This study showed that all the elements, except nitrogen, were retained sufficiently in the filter bed when a proper composition of nutrient solution was used for irrigation; however, phosphate addition may be needed when restarting a reactor from a prolonged period of shutdown. Distinct differences in the amount of transfer to the filter bed for different ingredients are probable, and may have to be taken into account when operating biofiltration reactors.

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Section: Introductionmentioning

confidence: 99%

Influence of phosphorus and trace metals in biofilters treating gaseous VOCs using a novel irrigation system

Mansoori

Ando

Higuchi

2019

Journal of the Air & Waste Management Association

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Innovative Bioreactors and Two‐Stage Systems

Rene

Veiga

Kennes

2013

Air Pollution Prevention and Control

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Optimizing nutrient supply in a rotatory-switching biofilter for toluene vapor treatment

Morita¹,

Okunishi

Higuchi

et al. 2012

Journal of the Air & Waste Management Association

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The influence of nutrient conditions on the degradation of toluene vapor in a rotatory-switching biofilter (RSB) was investigated. The biofilter consists of four segments connected in series, each with a packing layer made of polyvinyl formal. The influent airstreams including toluene vapors were passed through segments 1-3 as up-flow with a toluene concentration of 0.9-1.2 g m(-3) and with an empty-bed retention time of 26-52 sec. Nutrient solutions were fed to all packed segments once a day by means of immersion. The nutrient solution was used repeatedly and replenished by the addition of (NH4)2SO4. The result at 155 days showed nitrogen depletion was particularly obvious and the lack of nitrogen affected toluene removal. By adding 161 g of nitrogen solution per volumetric cubic meter of reactor, toluene removal efficiency was immediately increased to greater than 99%. With long-term biofilter operation, 21%-32% of ammonium was utilized for nitrification because of the growth of nitrifying bacteria such as Nitrosomonas sp. Based on the carbon-nitrogen balance, the daily nitrogen demand for toluene removal was estimated 2.1 g day(-1) at a toluene load of 70 g m(-3) hr(-1).

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Development of an innovative biofiltration system for the treatment of gaseous toluene

Cited by 4 publications

References 6 publications

Influence of phosphorus and trace metals in biofilters treating gaseous VOCs using a novel irrigation system

Influence of phosphorus and trace metals in biofilters treating gaseous VOCs using a novel irrigation system

Innovative Bioreactors and Two‐Stage Systems

Optimizing nutrient supply in a rotatory-switching biofilter for toluene vapor treatment

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