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Effect of Preparation for Concrete Paving Bricks by Using Municipal Solid Waste Incinerator on the Environmental Load

Author: CaoQi
Tutor: WuQingRen
School: South China University of Technology
Course: Materials Science
Keywords: Municipal solid waste incineration slag Resource utilization Unburned brick road Heavy metal Environmental Impact
CLC: TM619
Type: Master's thesis
Year: 2011
Downloads: 94
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Abstract


With China's economic development and urbanization, the garbage disposal problem has become a major problem. China now has more than 200 cities surrounded by garbage, \At present, most of the city with increasing garbage incineration disposal, while taking advantage of the heat of the incineration process to obtain energy for power generation. Incineration method has the advantage of a significant reduction effect, the volume can be reduced by 90%, leaving weight 20 3 0% Incineration incineration. Incineration ash, including fly ash and slag, fly ash is a hazardous waste incineration slag, a general solid waste accounts for about 80% of the amount of ash. The purpose of the research is the research and development of municipal solid waste incineration power plant slag preparation unburned brick road, incineration slag resource utilization. Based on the incineration of waste incineration power plant in Guangzhou Likeng slag composition and physical and chemical properties analysis, design different proportions of incineration slag unburned brick road, including the pier paving bricks and permeable pavers, using orthogonal experimental method to conduct a study into the different admixtures (including activator, early strength agent, dispersing agent) incineration slag unburned Road Tile by XRD and SEM / EDS analysis, to explore the admixture of garbage incineration mechanism of slag active. The results show that, NaOH, 0.81% Na 2 SiO 3 0.86% composite activator, and is equipped with Na 2 SO 4 for the early strengthening agent of 3% as well as naphthalene sulfonic acid formaldehyde condensate is 0.5% of a dispersing agent for incineration slag excited active effect. In the preparation process, the molding pressure and conservation of incineration slag unburned brick road compressive strength test. Especially in water-permeable bricks pilot study to design a permeable coefficient tester, test analysis of the relationship among the permeable brick compressive strength, permeability coefficient, porosity. Analysis of incineration slag containing heavy metals into the content of unburned brick road, the dissolution of heavy metals and heavy metals leaching toxicity security. The results show that, under acidic conditions (pH = 3.2) heavy metal leaching rate the highest neutral conditions of heavy metal leaching rate, followed by pH = 5 under the conditions of heavy metals leaching rate lowest dissolution rate; incineration slag of unburned brick road samples early 7d heavy metal fastest total heavy metals leaching of heavy metals within 7d about 66-88%; pilot research program MC-3 samples (34% incineration slag dosage Pier brick) and TB-3 (incineration slag dosage of 8.5 % permeable brick) samples cycle heavy metal impregnation liquid to achieve the requirements of the class II surface water standard. The life cycle assessment methods discussed the garbage incineration slag unburned brick road, the Netherlands brick and fired brick environmental load. The results show that, on the basis of the use of of incineration slag saving economic costs and protecting the environment, compared to the the Netherlands brick and fired brick, burning a greater degree of improvement in the slag unburned pavers impact on environmental load, the emissions of fired brick consumption indicators than the Dutch brick and slag brick have more serious environmental load. TB-3 under the program of experimental research data, the annual production capacity of 48,000 cubic meters of municipal solid waste incineration slag unburned paving brick production line feasibility analysis. The results showed that 5.662 million yuan investment in the construction of the production line, the annual benchmark rate of return of 22.2%, micro profitability processing incineration slag solid waste relevant departments receive government subsidies of 40-60 yuan / ton, the economic benefits of better. This not only saves landfill incineration slag land costs and resource utilization of incineration slag, has significant environmental and social benefits.

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