利用間歇高壓生物反應器結合砂濾程序去除廢水中有機物之研究

Intermittent high pressure sequential bioreactor(IHPSB) with integration of sand filtration system For synthetic wastewater treatment.

曾枱瑋(Tai-Wei Tzeng)

指導教授 ： 李奇旺

淡江大學/工學院/水資源及環境工程學系碩士班/碩士(2008年)

https://doi.org/10.6846/TKU.2008.00101

摘要

生物處理程序中，常因氧傳效率低及沉澱不良等問題導致放流水懸浮固體物濃度過高、反應槽中微生物大量流失，使得處理效益變差。MBR程序透過薄膜過濾來提昇固液分離效果，但MLSS對薄膜負荷影響很大，將促使通量降低，甚至造成濾膜阻塞而增加操作成本。
本研究之間歇高壓生物處理程序保留SBR程序中操作彈性佳及MBR系統可維持高污泥濃度等優勢，並以高壓曝氣方式提高溶氧濃度梯度來加快氧傳速率，亦利用天然細砂做為出流前阻隔活性污泥之基材。透過高壓曝氣來提升氧氣傳遞速率，使水體溶氧能被快速補充，更可利用砂層阻擋大量污泥，得到懸浮性固體物濃度小於150 mg/L之出流水，若需進一步提升出水品質時，亦可解決MBR系統中MLSS對薄膜之阻抗。
實驗結果發現間歇高壓生物反應器結合砂濾系統(IHPSB)的確能在短時間內提供高濃度溶氧(16~18 mg O2/L)且有效阻隔大量MLSS於反應槽內，加上活性污泥濃度皆維持10 g/L以上，使得系統能承受較高的COD負荷且有良好降解能力(90%)。本系統之高壓操作及砂濾方式相較於傳統處理而言均是一大突破。

關鍵字

高壓生物反應器 ； 活性污泥 ； 砂濾

並列摘要

In order to obtain high dissolved oxygen (DO) level, a laboratory scale high pressure (3 kg/cm2) bioreactor with a layer of sand in the bottom acting as filter was developed. High DO can support elevated activated sludge growth which in terms can sustain high COD loading. Integration of sand layer inside the reactor can reduce SS in the treated water. During a long-term operation of the intermittent high pressure sequential bioreactor (IHPSB), the results show that the sand filtration effectively reduced treated water SS (< 150 mg/L) when MLSS concentration was less than 18.65 g/L. DO as high as 14 to 18 mg O2/L can be obtained under high pressure aeration. The flux of IHPSB is stable around 500 LMH which is higher than that of MBR. In this study, organic loading rates ranging from 3.34 -14.32 kg COD/m3-day were tested and the removal efficiency of TOC on average was about 90%.

並列關鍵字

High pressure system ； activated sludge ； sand filtration

參考文獻

Bae, T.-H., Tak, T.-M., 2005. Interpretation of fouling characteristics of ultrafiltration membranes during the filtration of membrane bioreactor mixed liquor. Journal of Membrane Science 264, 151-160.

Bollyky, L.J., 1981. MASS TRANSFER OF OZONE INTO WATER: ENERGY REQUIREMENTS - STATE OF THE ART. Ozone: Science and Engineering 3, 181-210.

Bouhabila, E.H., R, B.A., H, B., 2001. Fouling characterisation in membrane bioreactors. Separation and Purification Technology 22-23, 123-132.

Burhanettin, F., and Bulent, Keskinler, 2006. Sludge characteristics and effect of crossflow membrane filtration on membrane fouling in a jet loop membrane bioreactor (JLMBR). Journal of Membrane Science, 578–587.

Chiu, Y.C., Lee, L.L., Chang, C.N., Chao, A.C., 2007. Control of carbon and ammonium ratio for simultaneous nitrification and denitrification in a sequencing batch bioreactor. International Biodeterioration and Biodegradation 59, 1-7.