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 Aquaculture Pond

林冠宏(Kuan-Hung Lin) ； 周楚洋(Chu-Yang Chou)

《農業機械學刊》 19卷4期 (2010/12) Pp. 75-93

https://doi.org/10.30062/JAM.201012.0001

摘要

本研究使用厭氧濾床處理含鹽人工廢水，菌種取自宜蘭縣礁溪鄉一海水養蝦池的底泥，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。結果顯示進流鹽度增加時，首先影響槽體中的pH值，若進流鹽度繼續增加，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）及進流鹽度分別為12.5 d、3.2 g COD/L/d及9%時，pH值、COD去除率、TS及SS分別為6.77、85%、67.47 g/L及3.59 g/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及進流鹽度分別為25 d、1.6 g COD/L/d及11%時，pH值、COD去除率、TS及SS分別為6.84、89.89%、83.70 g/L及3.84 g/L，而GPR、甲烷濃度及MPR則分別為0.73 L/L/day、53.52%及0.46L CH4/L/day。綜合而言，在增加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COD去除率在85%以上及40%以上產氣的甲烷濃度。

關鍵字

含鹽廢水 ； 厭氧濾床 ； 海水養殖池 ； 底泥

並列摘要

In this study, the anaerobic filter had been used to treat the artificial saline wastewater. The seed was obtained from the sludge of a 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 inflow 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 GPR, 53.52% of methane component and 0.46 L CH4/L/d of MPR was obtained. In summary, the salt tolerance of bacteria to high concentrations of NaCl will be improved when increasing HRT and decreasing OLR during reaction, and 85% of COD removal efficiency and 40% or higher of methane component in produced gas could be achieved.

並列關鍵字

Saline wastewater ； Anaerobic filter ； Seawater aquaculture pond ； Sludge