碩士 / 國立臺北科技大學 / 環境工程與管理研究所 / 97 / ABSTRACT
Title：The Study of Chitosan Additived to Remove Building Pages：121
Materials Formaldehyde concentration and Health
Risk Assessment.
School：National Taipei University of Technology
Department：Graduate Institute of Environment Engineering and Management
Time：Jan, 2009 Degree：Master
Researcher：Zhi-Yang Chan Advisor：Chao-Heng Tseng
Wen-Cheng Shao
Keywords：Formaldehyde, Chitosan, Health Risk Assessment, Chamber
In recent years, many research to confirm the indoor air quality can influence human’s healthy , and the indoor air pollutants, formaldehyde, is one of the main pollutants. Formaldehyde not only with acute hazard to human healthy, but also be classified as a cancer-causing substances, while in Taiwan due to decoration, climate and other factors, caused by the phenomenon of excessive formaldehyde.
We use a small size chamber system in this study, to control different types of adhesive, to improving the formaldehyde emission experiments. In indoor air pollution sources, adhesive is one of the main pollution at all. The study will be followed by agents of various types of adding different Chitosan additive ratio (3%, 6%, 9%), placed into the chamber system, with 0.5 ACH ventilation rate to monitoring of formaldehyde adhesive results, while formaldehyde concentration and Chitosan additive volume relationship when use different dosage of chitin additive ratio.
In this study, we can confer of formaldehyde concentration emitted by area curve and formaldehyde emission factor, analysis of the effect of Chitin to remove formaldehyde concentration, Chitosan to removal of formaldehyde rate, and health risk assessment to reduce indoor formaldehyde concentration on the human body''s harmfulness.
In the experiments, we used four types of agents to test experiments, such as two kinds of urea-formaldehyde adhesive resin and polyvinyl acetate adhesive. The results of the analysis of this study can be summarized in the following conclusions:
In the load rate of 0.125 (m2/m3), ventilation rate 0.5ACH settings, this study did not add the Chitosan additive in 24-hour dose experimental results show that , 24-hour average concentration of emission and Emission factors were 0.16 ~ 2.86ppm (0.78 ~ 13.9 mg/m2h).In steady state, the average concentration of emission and Emission factor were 0.02 ~ 0.21ppm (0.1 ~ 1.03mg / m2h).In added 3%, 6% and 9% chitin additives, monitoring the agent formaldehyde concentration was found that 24-hour average concentration of emission and Emission factor were 3% addition : 0.11 ~ 2.43ppm (0.55 ~ 11.9mg / m2h);
6% addition were 0.08 ~ 1.44ppm (0.42 ~ 7.04 mg/m2h); 9% addition were 0.05 ~ 0.38ppm (0.27 ~ 1.88mg/m2h). In steady-state average concentration of emission and Emission factor were adding 3% were 0.014 ~ 0.138ppm (0.068 ~ 0.675 mg/m2h); 6% addition were ND ~ 0.103ppm (0.504mg/m2h); 9% addition were ND ~ 0.095ppm (0.464 mg/m2h). The results showed that the additives increased, concentration of formaldehyde were reduced.
The removal rate of this study for 24 hours experimental results, including added Chitin-adhesive and not added one, compared their average concentration. The final results will be emitted formaldehyde concentration in the area of integral curve, you can understand to add in the amount of Chitin was 3%, 6%, 9% when the removal efficiency of formaldehyde generated 14% ~ 33%, 40 ~ 56% and 50 ~ 85%.
Health risk assessment of formaldehyde emitted by the steady state reached, the risk calculation. The average steady-state concentration of formaldehyde were ND ~ 1.05, therefore, the biggest risk value is 4.55*10-4, the smallest VaR 8.27*10-5, so they are not added Chitin, the risk would exceed the standard value (10-6). The results would be made aware of the added chitin increased with the increase in steady-state concentration of formaldehyde as the decline, but also reduce the value of health risks.
Experimental results show that urea-formaldehyde adhesive had a higher amount of formaldehyde emitted. Add in the Chitin will accelerate the process of urea-formaldehyde adhesive curing and shorten its liquefied to curing time, it would be necessary to shorten the urea-formaldehyde adhesive with Chitin reaction time, and immediately adhesive coating on the surface, to avoid affecting the urea-formaldehyde agent function.
| Identifer | oai:union.ndltd.org:TW/097TIT05087001 |
| Date | January 2009 |
| Creators | Zhi-Yang Chan, 陳智揚 |
| Contributors | Chao-Heng Tseng, Wen-Cheng Shao, 曾昭衡, 邵文政 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 122 |
Page generated in 0.4556 seconds