Related Experiment Video
Updated: Aug 10, 2026
09:46
Reducing Willow Wood Fuel Emission by Low Temperature Microwave Assisted Hydrothermal Carbonization
Published on: May 19, 2019
Municipal incineration bottom ash treatment using hydrothermal solidification
Zhenzi Jing1, Norihisa Matsuoka, Fangming Jin
1Graduate School of Environmental Studies, Tohoku University, Aoba20, Aoba-ku Sendai 980 8579, Japan. jing@mail.kankyo.tohoku.ac.jp
Waste Management (New York, N.Y.)
|March 17, 2006
Summary
Hydrothermal processing effectively solidifies municipal incineration bottom ash (MIBA), enhancing its tensile strength. This method shows potential for MIBA recycling with minimal heavy metal leaching.
Area of Science:
- Materials Science
- Environmental Engineering
- Waste Management
Background:
- Municipal incineration bottom ash (MIBA) presents a significant waste disposal challenge.
- Effective methods for MIBA solidification and recycling are crucial for sustainable waste management.
Purpose of the Study:
- To investigate the hydrothermal processing of MIBA for solidification.
- To evaluate the factors influencing the tensile strength of solidified MIBA.
- To assess the potential for heavy metal leaching from solidified MIBA.
Main Methods:
- MIBA was compacted (5-20 MPa) and hydrothermally cured (150-250°C, 10-72 h) in an autoclave.
- The influence of NaOH solution and fresh cement on tensile strength was examined.
- Laboratory leaching tests were performed to quantify heavy metal dissolution.
Main Results:
- Tensile strength was significantly enhanced by NaOH solution and fresh cement addition.
- Hydrothermal curing temperature and time critically impacted strength development.
- Formation of 1.1 nm tobermorite is speculated as the primary strengthening mechanism.
- Heavy metal leaching was minimal under the studied hydrothermal conditions.
Conclusions:
- Hydrothermal processing is a viable method for solidifying MIBA.
- The solidified MIBA exhibits promising mechanical properties and low heavy metal leachability.
- This technique offers high potential for the sustainable recycling of MIBA.
Related Concept Videos
01:30Biological Treatment of Effluent and Waste Water
Biological wastewater treatment relies on the metabolic activity of microorganisms to remove pollutants from sewage. In modern treatment systems, this process is organized into sequential stages that progressively reduce solid material, dissolved organic matter, and microbial contamination. Each stage plays a distinct role in improving water quality and preparing the effluent for safe discharge or reuse.Primary and Secondary TreatmentPrimary treatment is a physical process that removes large...
01:30Microbial Wastewater Treatment
Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.
01:25Atomic Absorption Spectroscopy: Atomization Methods
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the aerosol...
01:27Microbial Leaching
Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
00:52Washing, Drying, and Ignition of Precipitates
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...