scholarly journals Experimental Investigation of the Decarburization Behavior of Medical Waste Incinerator Fly Ash (MWIFA)

Processes ◽  
2018 ◽  
Vol 6 (10) ◽  
pp. 186 ◽  
Author(s):  
Guoxia Wei ◽  
Hanqiao Liu ◽  
Fang Liu ◽  
Tongtong Zeng ◽  
Guisheng Liu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Removal Efficiency ◽  
Tween 80 ◽  
Medical Waste ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Waste Incinerator ◽  
Pump Speed ◽  
Flotation Column ◽  
Micro Bubble

The objective of the research was to compare the flotation performance of medical waste incinerator fly ash (MWIFA) by considering two methods: the cyclonic-static micro-bubble flotation column (FCSMC) method and conventional flotation cell (CFC) method. The results indicated that for FSCMC, the optimum parameters were kerosene = 3.5 g/kg·ash, methyl isobutyl carbinol (MIBC) = 0.2 g/kg·ash, Tween 80 = 7.5% of kerosene concentration, slurry concentration = 100 g/L, and pump speed = 380 r/min. The optimized conditions resulted in a higher dioxin removal efficiency (90.98%), carbon removal efficiency (91.88%) and lower loss on ignition (LOI) (4.96%). The data obtained from the CFC under different optimum operating conditions were 88.65%, 90.63% and 5.68%, respectively. FSCMC was proven to be more efficient for the flotation of MWIFA than CFC.

scholarly journals Characteristics and Treatment Methods of Medical Waste Incinerator Fly Ash: A Review

Processes ◽  
2018 ◽  
Vol 6 (10) ◽  
pp. 173 ◽  
Author(s):  
Fang Liu ◽  
Han-Qiao Liu ◽  
Guo-Xia Wei ◽  
Rui Zhang ◽  
Tong-Tong Zeng ◽  
...  
Keyword(s):  
Fly Ash ◽  
Microwave Treatment ◽  
Medical Waste ◽  
Waste Incinerator ◽  
Municipal Solid Waste Incinerator ◽  
Carbonaceous Matter ◽  
Human Beings ◽  
Natural Properties ◽  
Treatment Techniques ◽  
Solid Waste Incinerator

Medical waste incinerator fly ash (MWIFA) is quite different from municipal solid waste incinerator fly ash (MSWIFA) due to its special characteristics of high levels of chlorines, dioxins, carbon constituents, and heavy metals, which may cause irreversible harm to environment and human beings if managed improperly. However, treatment of MWIFA has rarely been specifically mentioned. In this review, various treatment techniques for MSWIFA, and their merits, demerits, applicability, and limitations for MWIFA are reviewed. Natural properties of MWIFA including the high contents of chlorine and carbonaceous matter that might affect the treatment effects of MWIFA are also depicted. Finally, several commendatory and feasible technologies such as roasting, residual carbon melting, the mechanochemical technique, flotation, and microwave treatment are recommended after an overall consideration of the special characteristics of MWIFA, balancing environmental, technological, economical information.

scholarly journals Modeling and Optimization for Production of Rice Husk Activated Carbon and Adsorption of Phenol

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Y. S. Mohammad ◽  
E. M. Shaibu-Imodagbe ◽  
S. B. Igboro ◽  
A. Giwa ◽  
C. A. Okuofu
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Removal Efficiency ◽  
Rice Husk ◽  
Adsorption Process ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Process Variables ◽  
Adsorbent Dosage ◽  
Pretreatment Temperature

Modeling of adsorption process establishes mathematical relationship between the interacting process variables and process optimization is important in determining the values of factors for which the response is at maximum. In this paper, response surface methodology was employed for the modeling and optimization of adsorption of phenol onto rice husk activated carbon. Among the action variables considered are activated carbon pretreatment temperature, adsorbent dosage, and initial concentration of phenol, while the response variables are removal efficiency and adsorption capacity. Regression analysis was used to analyze the models developed. The outcome of this research showed that 99.79% and 99.81% of the variations in removal efficiency and adsorption capacity, respectively, are attributed to the three process variables considered, that is, pretreatment temperature, adsorbent dosage, and initial phenol concentration. Therefore, the models can be used to predict the interaction of the process variables. Optimization tests showed that the optimum operating conditions for the adsorption process occurred at initial solute concentration of 40.61 mg/L, pretreatment temperature of 441.46°C, adsorbent dosage 4 g, adsorption capacity of 0.9595 mg/g, and removal efficiency of 97.16%. These optimum operating conditions were experimentally validated.

Synthetic wollastonitic glass ceramics derived from recycled glass and medical waste incinerator fly ash

2018 ◽  
Vol 6 (5) ◽  
pp. 5812-5819 ◽  
Author(s):  
S. Papamarkou ◽  
C. Sifaki ◽  
P.E. Tsakiridis ◽  
G. Bartzas ◽  
K. Tsakalakis
Keyword(s):  
Fly Ash ◽  
Glass Ceramics ◽  
Medical Waste ◽  
Waste Incinerator ◽  
Recycled Glass

Detoxification of medical waste incinerator fly ash through successive flotation

2018 ◽  
Vol 54 (1) ◽  
pp. 163-172 ◽  
Author(s):  
Fang Liu ◽  
Han-Qiao Liu ◽  
Guo-Xia Wei ◽  
Rui Zhang ◽  
Gui-Sheng Liu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Medical Waste ◽  
Waste Incinerator

Removal of Iron from Metallurgical Grade Silicon with Pressure Leaching

2011 ◽  
Vol 675-677 ◽  
pp. 873-876 ◽  
Author(s):  
Ke Qiang Xie ◽  
Zhan Liang Yu ◽  
Wen Hui Ma ◽  
Yang Zhou ◽  
Yong Nian Dai
Keyword(s):  
Particle Size ◽  
Reaction Time ◽  
Removal Efficiency ◽  
Acid Concentration ◽  
Operating Conditions ◽  
Raw Material ◽  
Optimum Operating ◽  
Pressure Leaching ◽  
Metallurgical Grade Silicon ◽  
Grade Silicon

In this paper, removal of iron from metallurgical grade silicon with pressure leaching is carried out. We investigated the factors such as the concentration of hydrochloric, particle size of raw material ground, temperature, pressure and reaction time, which influenced on the removal of iron. The results show that the optimum operating conditions for pressure leaching in hydrochloride are: acid concentration 4 mol/L, diameter for raw material less than 50 μm, leaching temperature 160 0C，leaching pressure 2.0 MPa, leaching time 2.0 h. The content of iron residual in MG-Si powder was reduced to about 200 ppmw. The removal efficiency of iron is up to 90.90 %.

Characterization of mechanochemical treated fly ash from a medical waste incinerator

2010 ◽  
Vol 22 (10) ◽  
pp. 1643-1648 ◽  
Author(s):  
Zheng Peng ◽  
Qiong Ding ◽  
Yangzhao Sun ◽  
Chen Jiang ◽  
Xinhua Gao ◽  
...  
Keyword(s):  
Fly Ash ◽  
Medical Waste ◽  
Waste Incinerator
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