title: Performance evaluation of a slow-release packing material-embedded functional microorganisms for biofiltration.
abstract: A composite packing material (CM-5) was prepared in this study, mainly consisting of compost with functional microorganisms, calcium carbonate (CaCO3), perlite, cement and plant fiber. To get stronger compressive strength, mass ratios of these components were optimized based on single factor experiments, and finally adding amounts of perlite, cement, plant fiber, CaCO3, compost and binder at 18%, 18%, 7%, 13%, 17% and 27%, respectively. According to the optimum proportion, CM-5 was extruded in cylindrical shape (12 mm in diameter and 20 mm in length) with a bulk density of 470 kg m-3, a moisture retention capacity of 49% and the microbial counts of × 105CFU g-1of packing material. The cumulative release rates of total organic carbon (TOC) and total nitrogen (TN) from CM-5 were 3.1% and 6.5%, respectively, after 19 times extraction in distilled water. To evaluate the H2S removal capacity, CM-5 was compared with an organic (corncob) and an inorganic (ceramsite) packing material in three biofilters. The results showed that CM-5 had higher H2S removal capacity compared with corncob and ceramsite. CM-5 could avoid the large fluctuation of pH value and pressure drop during the operation. The maximum H2S removal capacity of CM-5 was 12.9 g m-3h-1and the removal efficiency could maintain over 95.4% when the inlet H2S loading rate was lower than 11.3 g m-3h-1without any addition of nutrients and pH buffer substances. Besides, only 2-3 days were needed for the recovery of biofiltration performance after about two weeks of idle period.
authors.affiliation: a College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics , Nanjing , People's Republic of China.|b School of Chemical Engineering and Energy, Zhengzhou University , Zhengzhou , People's Republic of China.
authors.forename: Rencheng
authors.initials: R
authors.lastname: Zhu
authors.affiliation: b School of Chemical Engineering and Energy, Zhengzhou University , Zhengzhou , People's Republic of China.
authors.forename: Shunyi
authors.initials: S
authors.lastname: Li
authors.affiliation: b School of Chemical Engineering and Energy, Zhengzhou University , Zhengzhou , People's Republic of China.
authors.forename: Zhenjun
authors.initials: Z
authors.lastname: Wu
authors.affiliation: c Department of Energy Systems and Environment , UMR CNRS 6144 GEPEA, Ecole des mines de Nantes , Nantes , France.
authors.forename: Éric
authors.initials: É
authors.lastname: Dumont
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D002021:Buffers; D002244:Carbon / Q000737:chemistry; D004867:Equipment Design; D005374:Filtration / Q000379:methods*; D006862:Hydrogen Sulfide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D009584:Nitrogen / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry; D010944:Plants / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods; D012822:Silicon Dioxide / Q000737:chemistry; D012987:Soil; D055549:Volatile Organic Compounds / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D003313:Zea mays
chemical_list: D002021:Buffers; D009930:Organic Chemicals; D012987:Soil; D055549:Volatile Organic Compounds; C003076:Perlite; D002244:Carbon; D012822:Silicon Dioxide; D000537:Aluminum Oxide; D009584:Nitrogen; D006862:Hydrogen Sulfide
keywords: Composite packing material; biofiltration; functional microorganisms; hydrogen sulfide; slow-release