碩士 / 國立高雄第一科技大學 / 環境與安全衛生工程所 / 94 / Abstract
Equipped with physical, biological and chemical treatment facilities,
Anping Industrial District Wastewater Treatment Plant treats industrial
wastewater mainly by means of the extended aeration of activated sludge
process. This plant focuses on biological treatment, which will decide if
chemical treatment should be used or not. “No Chemicals＂ is the target
for the plant.
However, the operation of biological treatment system is difficult for
some factors, such as the complexity of wastewater components, the changes
of concentration and variant amounts of wastewater flowing in specific
hours or seasons. Therefore, this research investigates how hydraulic
retention time (HRT) could contribute to the best operational effectiveness
of the biological treatment system.
In Anping Industrial District there are than 500 factories of various
industry. The wastewater from leather and food factories is nearly 40% of
the total wastewater, its COD is nearly 41% of the total and SS is around
45% of the total, so these two industries should be paid special attention.
The components of the wastewater in 2005 are as the follows: BOD is 145mg/l.,
COD is 251mg/l., SS is108mg/l. and BOD/COD ration is 58%. These figures
show that the wastewater is a kind of biodegradable organic wastewater which
should be treated in an activated sludge process.
This research presents how the continuous wastewater is dealt with by
the biological treatment system in different conditions. In the aspect of
BOD, when HRT is between 20 and 26 hours, the removal rate is more than
40% and effluent concentration is under 15mg/l. In the aspect of COD, if
HRT is between 20 and 26 hours, the removal rate is nearly 50% and effluent
concentration is under 60mg/l. In the aspect of SS, when HRT is 26 hours,
it can achieve the best removal rate (more than 60%). With regard to the
III
operational parameters of the biological treatment system, when F/M rate
(food-to-microorganism rate) is between 0.02 and 0.025 kgBOD5/ MLVSS-day,
the removal rate of COD achieves more than 40%. When F/M rate is between
0.02 and 0.03 kgBOD5/ MLVSS –day, the removal rate of BOD reaches 50%. The
treatment has better removal function if COD volumetric loading is 0.10
kgCOD/m3-day and BOD volumetric loading is 0.02kgBOD/m3-day. As for the
operational factors which affect microbial activities, pH should be kept
approximately 7.3. Heavy metal like Copper, Zinc and chromium should be
maintained below the level of biological inhibition, so that it doesn＇t
cause the metabolic process of microorganisms and can raise credibility
of this research. In microbial activities, if HRT is 20 hours, specific
oxygen uptake rate is 3.3 mgO2/gMLVSS-day. The shorter the HRT is, the higher
the specific oxygen uptake rate could be.
| Identifer | oai:union.ndltd.org:TW/094NKIT5519018 |
| Date | January 2006 |
| Creators | Shih-Chun Hsueh, 薛世俊 |
| Contributors | Chih-Ju George Jou, 周志儒 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 99 |
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