碩士 / 國立中興大學 / 環境工程學系所 / 103 / Traditionally, low strength wastewater and domestic wastewater have been treated with aerobic processes. However, aerobic processes have several drawbacks, such as high land area required, high construction and operation cost, large energy consumption for aeration, and the considerable amount of waste sludge generated. Solving environmental problems but also generating others would be considered as infringement the spirit of recycling and sustainable using in today’s world.
This research focused on a combined system containing a high-rate anaerobic and an algae reactor in replace of the traditional aerobic process. Anaerobic process has the advantage of reducing high energy consumption on aeration unit and has the ability to transfer organic pollutions into methane and carbon dioxide. Therefore, anaerobic systems could reduce wasted sludge generation. Also the anaerobic-generated carbon dioxide can also be re-utilized as the C-source to enhance the algae growth. The photosynthesis and growth of algae can achieve the simultaneous removal of carbon, nitrogen, and phosphorate through algae harvesting.
The system was the combination of an UASB (Up-flow Anaerobic Sludge Blanket) and an algae reactor. During the first stage, the average influent COD concentration was 465 mg L-1. The average effluent COD was 38.3 mg L-1 with the combination of an UASB at HRT of 8 hrs and an algae reactor at HRT of 32 hrs. The average removal efficiency of COD, NH4+-N and PO4-3 were 92%, 47% and 45%, respectively. During the second stage, average influent and effluent COD concentration were 227 mg L-1 and 14.0 mg L-1, respectively. The system was operated with an UASB at HRT of 8 hrs and an algae reactor at HRT of 72 hrs. The removal efficiency of COD, NH4+-N and PO4-3 were 94%, 81% and 14%, respectively.
The results demonstrated the UASB-algae combined system was not only efficient in treating low strength wastewaters but also has features of energy saving and excellent operation stability. The combined system showed the feasibility of simultaneous achievement in wastewater treatment and nutrients recovery.
| Identifer | oai:union.ndltd.org:TW/103NCHU5087025 |
| Date | January 2015 |
| Creators | Hsiu-Ling Lin, 林秀玲 |
| Contributors | 盧至人 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 88 |
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