A comparative study on characteristics and leaching toxicity of fluidized bed and grate furnace MSWI fly ash

2022 ◽  
Vol 305 ◽  
pp. 114345
Author(s):  
Chengcheng Fan ◽  
Baomin Wang ◽  
Hongmei Ai ◽  
Ze Liu
Keyword(s):  
Fly Ash ◽  
Comparative Study ◽  
Fluidized Bed ◽  
Mswi Fly Ash ◽  
Leaching Toxicity

Dried Municiple Sewage Sludge Gasification Experiment in Dual Fluidized Bed

2011 ◽  
Vol 383-390 ◽  
pp. 3799-3804
Author(s):  
Xiao Xu Fan ◽  
Lei Zhe Chu ◽  
Li Guo Yang
Keyword(s):  
Fly Ash ◽  
Sewage Sludge ◽  
Fluidized Bed ◽  
Calorific Value ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Test Results ◽  
Leaching Toxicity ◽  
Dual Fluidized Bed ◽  
Hot Test

The fuel characteristics of municipal sewage sludge are suitable for dual fluidized bed(DFB) gasification, which can get middle calorific value gas through volatile pyrolysis, and reduce volume through char combustion. The hot test results of municipal sewage sludge on DFB rig were showen that the temperature distribution along combustor heigh is uniform, and the carbon content of fly ash is about 2~3%. In the experiment, with the increase of gasifier temperatrue, the more volatile of the sewage sludge was pyrolyzed. When the temperature of the gasifier reached 800°C, the calorific value of gas was 6.9MJ/Nm3; the emissions of SO2, NOx and HCl were appropriate to the standard. The leaching toxicity of heavy metal of the fly ash was lower than the discharge standard.

Analysis of Heavy Metal Leaching in Fly Ash from One Shanghai Municipal Solid Waste Incineration (MSWI) Plant

2012 ◽  
Vol 531 ◽  
pp. 292-295
Author(s):  
Hai Ying Zhang ◽  
Guo Liang Yuan ◽  
Guo Xian Ma
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Hazardous Waste ◽  
Extraction Procedure ◽  
Waste Incineration ◽  
Municipal Solid Waste Incineration ◽  
Mswi Fly Ash ◽  
Leaching Toxicity

The characteristics and leaching behavior of heavy metals in fly ash, sampled from one MSWI (municipal solid waste incineration) plant in Shanghai China, were investigated. The results indicated that the main elements of fly ash were Fe, K, Na, Cl, Si, Ca, Al, and the total fraction of heavy metals was in the range of 0.8 % - 2.0%. Hence, MSWI fly ash was considered to be one kind of hazardous waste due to its potential environmental risk. Leaching toxicity was performed on fly ash samples from the MSWI plant in Shanghai China. Leaching toxicity of the heavy metals by the ALT (available leaching toxicity) procedure exceeded that by the HVEP (horizontal vibration extraction procedure) standard. Leaching concentrations of Ni, Zn, Cd and Pb exceeded the limit of hazardous waste identification standard. Hence, fly ash is a hazardous waste.

Application of Dechlorinated MSWI Fly Ash in Asphalt Mixtures

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
Hu T ◽  
◽  
Zhao K ◽  
Chen D ◽  
Hu Y ◽  
...  
Keyword(s):  
Fly Ash ◽  
Waste Incineration ◽  
Environmental Risks ◽  
Asphalt Mixtures ◽  
Municipal Solid Waste Incineration ◽  
Mswi Fly Ash ◽  
Water Absorption Coefficient ◽  
Leaching Toxicity ◽  
Application Requirements ◽  
Marshall Stability

The application of Municipal Solid Waste Incineration (MSWI) fly ash in asphalt mixtures is an efficient way to utilize fly ash. The feasibility of applying various kinds of dechlorinated fly ash in asphalt mixtures was comprehensively discussed in the study. The effects of types and amounts of dechlorinated fly ash on the performances of prepared asphalt mixtures were explored. Additionally, their environmental risks and economic values were further evaluated. The water absorption coefficient and porosity of fly ash-asphalt mixtures were respectively in the ranges of 0.15-0.5% and 3-4%, which met the application requirements of asphalt. The replacement of Raw Fly Ash (RFA) and Dechlorinated Fly Ash (DFA) improved Marshall stability, split strength, and Tensile Strength Ratio (TSR) of asphalt mixtures. DFA realized the more significant improvements. The leaching concentrations of heavy metals in all the prepared asphalt mixtures were lower than the detection limit, indicating that there was no risk of leaching toxicity.

Safe Analysis of Construction Material after Being Sintered

2013 ◽  
Vol 849 ◽  
pp. 253-256
Author(s):  
Hai Ying Zhang ◽  
Shu Zhen Li
Keyword(s):  
Fly Ash ◽  
Construction Material ◽  
Extraction Procedure ◽  
Waste Incineration ◽  
Municipal Solid Waste Incineration ◽  
Mswi Fly Ash ◽  
Horizontal Vibration ◽  
Limit Value ◽  
Leaching Toxicity ◽  
Toxicity Analysis

In this work, leaching toxicity of MSWI (municipal solid waste incineration) fly ash by HVEP (horizontal vibration extraction procedure) and ALT (available leaching toxicity) as a function of temperature was analyzed. MSWI fly ash was firstly sintered at 700°C, 800°C, 900°C, 1,000°C and 1,100°C respectively for 30 minutes, and then underwent leaching toxicity analysis of heavy metals. It was found that leaching toxicity of the heavymetals in fly ash sintered at temperatures over 900°C is lower than the limit value described in Identification Standard of Hazardous WasteIdentification of Leaching Toxicity. Therefore, 1000°C is recommended to treat MSWI fly ash.

Comparative study of the application of traditional and novel extractants for the separation of metals from MSWI fly ash leachates

2018 ◽  
Vol 172 ◽  
pp. 143-154 ◽  
Author(s):  
Jinfeng Tang ◽  
Rikard Ylmén ◽  
Martina Petranikova ◽  
Christian Ekberg ◽  
Britt-Marie Steenari
Keyword(s):  
Fly Ash ◽  
Comparative Study ◽  
Mswi Fly Ash

Organic Pollutant of PAHs and Dioxins on the MSWI Fly Ash

2012 ◽  
Vol 518-523 ◽  
pp. 3599-3604 ◽  
Author(s):  
Zhi Xuan Zhang ◽  
Qun Li ◽  
Si Ming Liu ◽  
Ji Xin Su
Keyword(s):  
Fly Ash ◽  
Fluidized Bed ◽  
Organic Pollutants ◽  
Circulating Fluidized Bed ◽  
Organic Pollutant ◽  
Great Contribution ◽  
Mswi Fly Ash

In this paper, two fly ash samples from a popular of circulating fluidized bed (CFB) incinerators operated in spring and winter were detected. The organic pollutants of PAHs and Dioxins were 8.647 mg/kg and 778.859 pgI-TEQ/g respectively for the sample in spring, 11.008 mg/kg and 888.318 pgI-TEQ/g for the sample in winter. The distribution of Dioxins was analyzed, 2,3,4,7,8-PeCDF,2,3,7,8-TCDF and 2,3,7,8-TCDD were found to gave the great contribution to the total I-TEQ.

Compound stabilization/solidification of MSWI fly ash with trimercapto-s-triazine and cement

2012 ◽  
Vol 66 (3) ◽  
pp. 689-694 ◽  
Author(s):  
Qiang Xue ◽  
Jiangshan Li ◽  
Zhuyun Hu
Keyword(s):  
Fly Ash ◽  
Pollution Control ◽  
Waste Incineration ◽  
Good Effect ◽  
Mswi Fly Ash ◽  
Treatment Technology ◽  
Batch Tests ◽  
Leaching Toxicity ◽  
New Treatment ◽  
Positive Effect

A new treatment technology of municipal solid waste incineration (MSWI) fly ash is presented in this paper. Feasibility of solidification/stabilization treatment of MSWI by successively adding trimercapto-s-triazine and cement, and the effect of addition, fly ash size and curing time were studied by batch tests. The results showed that MSWI posed a huge environmental risk, the partical distribution showed normal distribution approximately. Treatment of fly ash with trimercapto-s-triazine and cement showed a good effect, the leaching toxicity of treated fly ash solidified blocks with 2% trimercapto-s-triazine and 20% cement could meet the standard for pollution control on the landfill site of MSW in China after curing for 7 days, and the flexural strength of solidified blocks could reach 2.4 MPa. Ground fly ash had a positive effect on both leaching toxicity and strength.

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