以活性污泥膜濾法（MBR）作為五股工業區旋轉生物圓盤（RBC）出流水三級處理可行性研究

The study on Membrane Bio-Reactor (MBR) following Rotating Biological Contactor (RBC) for tertiary treatment of the Wuku Industrial Park

陳柏銓(Po-Chuan Chen)

指導教授 ： 陳孝行 ； 翁煥廷

國立臺北科技大學/工程學院/環境工程與管理研究所/碩士(2010年)

https://doi.org/10.6841/NTUT.2010.00283

摘要

目前全球水資源匱乏，各國相關單位積極研發水資源回收再利用技術，活性污泥膜濾法為近20年來創新之技術，本研究以市售薄膜直接應用於工業區污水處理廠之處理程序中，評估實廠運用之可行性，進而達到節省用地取得成本，取代傳統三級處理之目的。本實驗探討MBR於實廠運作之最佳操作條件，導入五股工業區經旋轉生物圓盤(RBC)未沈降之處理水，模擬MBR安置於終沈池中進行試驗；透過初期植種培養與薄膜操作特性試驗等，將透膜壓力控制TMP在9.8 kpa條件下，觀察產水通量LMH/TMP（Bar）及反應槽MLSS與SV30、產水水質SDI對COD、SS去除成效；期間以曝氣強度為0.012min-1，產水頻率1分鐘off，9分鐘on、硝化液迴流量控制3.9Q時有最佳產水通量124.4 LMH/Bar，再控制MBR反應槽內 MLSS濃度分別於6,000~10,000、10,000~14,000、14,000~18,000等三階段操作條件下，從實廠變異性高之處理水化驗分析產水之COD、SS、SDI、產水通量關係，得知反應槽MLSS濃度控制10,000~12,000 mg/L時有穩定的產水通量118~120LMH/Bar，產水COD＜20 mg/L 、SDI＜2.5以下，但反應槽MLSS濃度超過12,000 mg/L產水通量開始有下降趨勢，推估胞外聚合物造成阻塞。二級處理放流水中大腸桿菌分析為4.1~7.4*105（CFU/100mL），經過MBR處理後之產水中水大腸桿菌＜10（CFU/100mL），故本系統對大腸桿菌去除高達99.98%以上。處理水中COD、SS去除率分別為95 ％、99.98 ，採用MBR處理每噸污水相較於RBC二級處理程序，污泥產生量減少約0.12 kg/M3，約減少70.5 污泥產生量，污泥處置費由357,820元/月下降至105,628元/月成效良好，而且可以於現有工業區污水處理廠單元內直接進行改裝，無須再增加新設施土地成本，水質良好可以直接用於沖廁、澆灌或冷卻水等用途，提供再生水RO程序合宜前置處理水。

關鍵字

旋轉生物圓盤 ； 活性污泥膜濾法 ； 水資源回收

並列摘要

In the wake of the worldwide shortage of water resources nowadays, relevant units in each country have been enthusiastically researching & developing the recovery & recycling technology for water resource; and the Membrane Bio-Reactor (MBR) for activated sludge therein is an innovative technology in the past two decades. This study applied the membranes sold in the market to the disposal procedures in the Wastewater Treatment Plant of the Industrial Park, and assessed the feasibility of thereof operation in a full-scale plant so that the purpose to save the land occupation and acquisition cost and to substitute the traditionally tertiary treatment are achievable. This experiment explored the optimal operating conditions for applying the MBR to an operation of full-scale plant by leading in the treated water without sedimentation from the Rotating Biological Contactor in Wuku Industrial Park, and simulated to perform the test with the MRB installed in the Final Sedimentation Tank By going through the planting & culture at primary stage and the test for operating characteristics of membrane with the Trans-Membrane Pressure (TMP) controlled at 9.8kpa, the water flux LMH/TMP(Bar), MLSS and SV30 in reaction tank, water quality SDI vs. COD from water production and SS removal effectiveness were observed. During the runtime, an optimal 124.4 LMH/Bar water flux was obtained by applying an aeration intensity 0.012 min-1, water-producing frequency 1-minute off and 9-minute on, and circulation of nitrified liquid controlled at 3.9Q; and then the MLSS concentration inside the MBR reaction tank was controlled at 6,000 ~ 10,000, 10,000 ~14,000 and 14,000 ~ 18,000 mg/L as the operating condition of 3 stages respectively. As learned from the assay & analysis for the relation amongst COD, SS, SDI and water flux in water production from the treated water of the full-scale plant at high variability, a water flux 118 ~ 120 LMH/Bar, COD<20 mg/L and SDI <2.5 from water production were stable when controlled the MLSS concentration in reaction tank at 10,000 ~ 12,000 mg/L; and the water flux began to go downtrend at a MLSS concentration in reaction tank over 12,000 mg/L. It is inferred that the extracellular polymeric substances caused a clog. The E. coli was 4.1 ~ 7.4 *105 (CFU/100mL) from the effluent analysis at secondary treatment while the E. coli was <10 (CFU/100mL) from the water produced after the MBR treatment. Thus, the system can eliminate the E. coli up to more than 99.98%. The removal rate of COD and SS from the treated water were 95% and 99.98% respectively; and the production volume of sludge was reduced by 0.12 kg/m3 in comparison with the RBC secondary treatment procedure after the introduction of MBR for wastewater treatment; i.e., 70.5% sludge production volume was lessened approximately; also, the handling charge for sludge was decreased from 357,820 dollars/month to 105,628 dollars/month, excellent result; furthermore, the modification in this regard can be undertaken directly to the existing unit of wastewater treatment plant in industrial park without extra land cost for the new facilities; moreover, the treated water has a good water quality that can be used to flush the toilet, irrigation or cooling water, etc. applications, and it can be supplied as the pre-treated water to the RO procedure for water regeneration.

並列關鍵字

rotating biological contactor ； membrane bioreactor ； water recycling

參考文獻

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