碩士 / 國立交通大學 / 環境工程所 / 87 / The chemical mixture, including acrylonitrile, butadiene and styrene (named as ABS), is widely used in the manufacturing industries of car and electronic products in Taiwan. A large amount of the waste activated sludge (WAS) containing the ABS is generated from the industrial wastewater treatment plants. To effectively dispose the WAS, it is understood that the anaerobic hydrolysis is a suitable process. For the purpose of getting the maximum formation of the volatile fatty acids (VFAs), four reaction parameters such as the hydraulic retention time (HRT of 5 and 10 days), pH value (5.0, 5.5, 6.0 and 6.5), organic loading rate (0.71-1.96 Kg VS/m3d) and temperature (ambient temperature and 35oC) are studied in this research. The objective of this research is to find out the optimal condition for the treatment of WAS using an anaerobic hydrolysis process.
The WAS sample was collected from a nitrification/denitrification tank in the industrial wastewater treatment plant located in southern Taiwan. In this research, the total solids (TS) concentration of the WAS was pre-adjusted to 1、2 and 2.5% (10,400、20,257 and 24,640 mg/l) and then was used as a feeding substrate in the anaerobic hydrolysis system. The working volume of the reactors was 3 liter, which was designed as a completely mixed reactor. Experimental result indicates that there are five types of short-chain VFAs are produced when the WAS is anaerobic hydrolyzed. A longer HRT and a higher reaction temperature give better productions of dissolved organic carbon (DOC) and VFAs. When the pH value was conducted between 5.0 and 5.5, there is no biogas and was observed in the anaerobic reactors. Experiment al result also indicated that the concentration of DOC and VFAs in supernatant increases with increasing TS conc. or organic loading. When the reaction was performed in the optimal condition (HRT 10 days, pH 5.0, reaction temperature 35oC and organic loading rate 1.52 Kg VS/m3d), the concentration of DOC and VFAs containing in supernatant were 510 mg C/l and 1516 mg COD/l, respectively. In conclusion, the anaerobic hydrolysis process was proven in this study that it was enough to generated VFAs and DOC to achieve the purpose of resource recovery.
| Identifer | oai:union.ndltd.org:TW/087NCTU0515022 |
| Date | January 1999 |
| Creators | Chi-Tang Ke, 柯啟棠 |
| Contributors | Jih-Gaw Lin, 林志高 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 84 |
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