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標題: | 以海水養殖池厭氧污泥處理含鹽廢水 Treatment of Saline Wastewater by Using the Anaerobic Sludge of Seawater Aqualture Pond |
作者: | Kuan-Hung Lin 林冠宏 |
指導教授: | 周楚洋(Chu-Yang Chou) |
關鍵字: | 含鹽廢水,厭氧濾床,海水養殖池,底泥, Saline wastewater,Anaerobic filter,Seawater aquaculture pond,Sludge, |
出版年 : | 2008 |
學位: | 碩士 |
摘要: | 過去處理含高鹽分的廢水通常採熱處理的方式,但此種方式須消耗大量的能源,因此處理成本無法降低。若是能利用厭氧處理,將廢水中的有機質轉變為可利用的甲烷,再以甲烷做為熱處理時的燃料,將可降低其處理成本。
本研究使用厭氧濾床處理含鹽的人工廢水,菌種取自宜蘭縣礁溪鄉一民間海水養蝦池中的底泥,實驗過程中在廢水裡緩慢增加鹽分,讓微生物在含鹽的廢水中逐漸適應且加強去除有機物的處理能力,並產生可利用的甲烷。 結果顯示鹽度增加時,首先影響槽體中的pH值,若鹽度繼續增加,則槽體中COD會開始快速累積,之後氣體產量及甲烷產量才會受到影響。當操作在水力停留時間( HRT )、有機負荷( OLR )及鹽度分別為12.5 d、3.2 g COD/L/d及9%時,pH、COD去除率、TS及SS分別為6.77、85%、67.47g/L及3.59g/L;而氣體產率( GPR )、甲烷濃度及甲烷產率( MPR )則分別為1.11 L/L/day、47.12%及0.58 L CH4/L/day。當HRT、OLR及鹽度分別為25d、1.6 g COD/L/d及11%時,pH、COD去除率、TS及SS分別為6.84、89.89%、83.70g/L及3.84g/L,而GPR、甲烷濃度及MPR則分別為0.73 L/L/day、53.52%及0.46 L CH4/L/day。綜合而言,在增長HRT和降低OLR的條件下,厭氧菌對鹽度的耐受力會增加,且可維持去除COD效率在85%以上,以及濃度在40%以上的甲烷。 Thermal treatment was usually adopted in dealing with the hypersaline wastewater in the past. However, treatment cost was unable to reduce due to the huge amounts of energy consumption. Therefore, to produce the methane gas from the wastewater organics through the anaerobic fermentation is a possible measure to supply the fuel source of the thermal treatment, as well as to effectively reduce the treatment cost. In this study, the anaerobic filter has been used to treat the artificial saline wastewater. The seed was obtained from the sludge of a private seawater shrimp pond located in Jiaosi Twonship, Yilan County, Taiwan. Salt content was slowly increased in the wastewater during different fed-batch tests to allow the anaerobic bacteria were able to adapt the saline environment, and to enhance their capability to degrade the organics and to produce the methane gas. The experimental results showed that, when salt content increased, the pH was affected firstly, and accumulation of the COD was observed when salt content kept on increasing, and then the decline of the methane production. When operated at 12.5 d of hydraulic retention time (HRT), 3.2 g COD/L/d of organic loading rate (OLR) and 9% of salt content, the performance of pH 6.77, 85% of COD removal efficiency, 67.47 g/L of TS, 3.59 g/L of SS, 1.11 L/L/d of gas production rate (GPR), 47.12% of methane component and 0.58 L CH4/L/d of methane production rate was obtained. For the other comparison experiment, which was operated at 25 d of HRT, 1.6 g COD/L/d of OLR and 11% of salt content, the performance of pH 6.84, 89.89% of COD removal efficiency, 83.70 g/L of TS, 3.84 g/L of SS, 0.73 L/L/d of gas production rate (GPR), 53.52% of methane component and 0.46 L CH4/L/d of methane production rate was obtained. In summary, the endurability of the bacteria of the salt content will improve when increasing HRT and decreasing OLR, the performance of 85% of COD removal efficiency and 40% or higher of methane component could be achieved. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37108 |
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顯示於系所單位: | 生物機電工程學系 |
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