Performance enhancement of a biofilter with pH buffering and filter bed supporting material in removal of chlorobenzene
Journal
Chemosphere
Journal Volume
251
Date Issued
2020
Author(s)
Abstract
Acidic substances, which produced during chlorinated volatile organic compounds, will corrode the commonly used packing materials, and then affect the removal performance of biofiltration. In this study, three biofilters with different filter bed structure were established to treat gaseous chlorobenzene. CaCO3 and 3D matrix material was added in filter bed as pH buffering material and filter bed supporting material, respectively. A comprehensive investigation of removal performance, biomass accumulation, microbial community, filter bed height, voidage, pressure drops, and specific surface area of the three biofilters was compared. The biofilter with CaCO3 and 3D matrix material addition presented stable removal performance and microbial community, and greater biomass density (209.9 kg biomass/m3 filter bed) and growth rate (0.033 d−1) were obtained by using logistic equation. After 200 days operation, the height, voidage, pressure drop, specific surface area of the filter bed consisted of perlite was 27.4 cm, 0.39, 32.8 Pa/m, 974,89 m2/m3, while those of the filter bed with CaCO3 addition was 28.2 cm, 0.43, 21.3 Pa/m, and 1021.03 m2/m3, and those of the filter bed with CaCO3 and 3D matrix material addition was 28.7 cm, 0.55, 17.4 Pa/m, and 1041.60 m2/m3. All the results verified the biofilter with CaCO3 and 3D matrix material addition is capable of sustaining the long-term performance of biofilters. CaCO3 could limit the changes of removal efficiency, microbial community and filter bed structure by buffering the pH variation. And 3D matrix material could maintain the filter bed structure by supporting the filter bed, regardless of the buffering effect. © 2020 Elsevier Ltd
Subjects
3D matrix material; Biofilter; Buffering; Chlorobenzene; pH
SDGs
Other Subjects
Biofilters; Biomass; Calcite; Calcium carbonate; Drops; Growth rate; Microorganisms; pH; Pressure drop; Specific surface area; Volatile organic compounds; Buffering; Chlorinated volatile organic compounds; Chlorobenzene; D matrixes; Gaseous chlorobenzene; Long term performance; Microbial communities; Performance enhancements; Biological filter beds; calcium carbonate; carbon dioxide; chlorobenzene; aluminum oxide; chlorobenzene; Perlite; silicon dioxide; volatile organic compound; biofiltration; buffering; calcium carbonate; chlorobenzene; growth rate; microbial community; performance assessment; pH; pollutant removal; surface area; three-dimensional modeling; Article; biofiltration; biomass; height; high throughput sequencing; microbial community; microbial degradation; microbial growth; nonhuman; nutrient solution; particle size; pH; pressure; retention time; sludge; surface area; chemistry; filtration; gas; pH; procedures; water management; water pollutant; Aluminum Oxide; Biomass; Chlorobenzenes; Filtration; Gases; Hydrogen-Ion Concentration; Silicon Dioxide; Volatile Organic Compounds; Water Pollutants, Chemical; Water Purification
Type
journal article