title: Utilization of open pit burned household waste ash--a feasibility study in Dhaka.
abstract: Informal incineration or open pit burning of waste materials is a common practice in the peripheral area of Dhaka, one of the fastest growing mega-cities in the world. This study deals with the effect of open pit burned (i.e. open burned) household waste bottom ash on ﬁred clay bricks. Between 0 to 50% (by weight) of open pit burned household waste bottom ash was mixed with clay to make bricks. The molded specimens were air-dried at room temperature for 24 h and then oven dried at 100 °C for another 24 h to remove the water. The raw bricks were fired in a muffle furnace to a designated temperature (800, 900 and 1000 °C, respectively). The firing behaviour (mechanical strength, water absorption and shrinkage) was determined. The microstructures, phase compositions and leachates were evaluated for bricks manufactured at different firing temperatures. These results demonstrate that open pit burned ash can be recycled in clay bricks. This study also presents physical observations of the incinerated ash particles and determination of the chemical compositions of the raw materials by wet analysis. Open pit burned ash can be introduced easily into bricks up to 20% wt. The concentrations of hazardous components in the leachates were below the standard threshold for inert waste category landfill and their environmental risk during their use-life step can be considered negligible.
authors.affiliation: Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology (BUET), Dkaka, Bangladesh.
authors.forename: Md Obaidul
authors.initials: MO
authors.lastname: Haque
authors.forename: Ahmed
authors.initials: A
authors.lastname: Sharif
mesh_terms: D000538:Aluminum Silicates / Q000032:analysis; D001459:Bangladesh; D002947:Cities; D000077215:Clay; D060729:Coal Ash / Q000032:analysis; D003252:Construction Materials / Q000032:analysis*; D005240:Feasibility Studies; D017745:Incineration; D059027:Recycling; D014866:Waste Products / Q000032:analysis*
chemical_list: D000538:Aluminum Silicates; D060729:Coal Ash; D014866:Waste Products; D000077215:Clay
keywords: Open pit burning; ash; characterization; fired clay brick; household wastes; recycling