title: Slow-release of methanogenic inhibitors derived from encapsulated calcium carbide using paraffin wax and/or rosin: matrix optimization and diffusion characteristics.
abstract: Acetylene has been found to significantly inhibit biological activity of methanogens and thus might be applicable for reducing the generation and emission of methane from municipal solid waste landfills. However, acetylene is gaseous and so it is considered physically infeasible to directly apply this gas to waste in landfill conditions. In the present study, a novel acetylene release mechanism was tested, using a matrix of acetylene entrapped in high hydrophobic paraffin wax and/or rosin and calcium carbide capsules with a ratio of 1.0 g g(-1) matrix and a diameter of 10 mm to facilitate the gradual release of acetylene. A diffusion mechanism model (Q = &b.gamma; × t (0.5)) for the matrix was derived based on the T. Higuchi equation, and the effective diffusion coefficients (D(e)) were acquired by linear fitting. Additionally, it was found that D(e) remained constant when the rosin content was up to more than 20% g g(-1) matrix.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Tiantao
authors.forename: Zhao
authors.initials: Z
authors.lastname: Youcai
authors.forename: Zhang
authors.initials: Z
authors.lastname: Lijie
authors.forename: Chen
authors.initials: C
authors.lastname: Haoquan
authors.forename: Shi
authors.initials: S
authors.lastname: Feng
authors.forename: Zhou
authors.initials: Z
authors.lastname: Haiyan
mesh_terms: D000114:Acetylene / Q000031:analogs & derivatives* / Q000378:metabolism; D004058:Diffusion; D057927:Hydrophobic and Hydrophilic Interactions; D008697:Methane / Q000032:analysis* / Q000037:antagonists & inhibitors / Q000378:metabolism; D008855:Microscopy, Electron, Scanning; D008956:Models, Chemical; D010232:Paraffin / Q000737:chemistry / Q000494:pharmacology*; D012037:Refuse Disposal / Q000379:methods*; D012116:Resins, Plant / Q000737:chemistry / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D012116:Resins, Plant; D010232:Paraffin; C006873:calcium carbide; C013893:rosin; D000114:Acetylene; D008697:Methane