Treatment of Industrial Paper Mill Effluent with Sequencing Batch Reactor Technology

工業紙廠廢水循序批式活性污泥法處理之研究

王益真(I-Chen Wang) ； 羅松年(Sung-Nien Lo)

《台灣林業科學》 15卷4期 (2000/12) Pp. 445-456

https://doi.org/10.7075/TJFS.200012.0445

摘要

循序批式活性污泥法係傳統活性污泥法之改良法，採間歇曝氣批式運作。採集以舊紙箱板為原料再製芯紙與裱面紙之某工業紙廠初沉廢水進行桌上模擬處理試驗。該廠初沉廢水平均含化學需氧量(COD)3000mg/L、生化需氧量(BOD5)1800mg/L及懸浮固體(SS)400mg/L。於處理槽中進行含進料、曝氣、沉澱、排液與靜置五階段為時8小時之循環，歷經1.33-3.0日水力停留時間之單段處理即可獲甚佳之穩定態排液水質。進流水質儘管有相當變異，處理後水質均能保持穩定。廢紙污染基質去除率COD達90-94%，BOD5則超過98%，為極高之處理效率。穩定態基質去除之動力學研究顯示為一級反應。氧攝取率與比氧利用率之測定顯示反應曝氣起始與結束時數值目差近四倍，反映了批式系統微生物經歷飽／饑之循環，增進微生物的篩選與效率。本研究顯示循序批式活性污泥法適合工業紙廠廢水之處理，惟本研究至實用階段尚須考量放大規模所生之變數。

關鍵字

循續批式法 ； 活性污泥法 ； 廢水處理 ； 工業紙廠廢水

並列摘要

Sequencing batch reactor (SBR) is a variant of the activated sludge process that instead of operating continuously, runs on a batch mode. Effluents from industrial paper mills converting old corrugated container board (OCC) to corrugating medium and liner typically have very high pollutant loading. A study was conducted to treat effluent from the primary sedimentation tank of an OCC mill with a bench-scale SBR unit. Various 8-h cycles consisting of fill, react, settle, draw, and idle stages were imposed, and hydraulic retention times of the system varied from 1.33 to 3.0 d. Influents with an average COD of 300(superscript +) mg/L, BOD5 of 1800 mg/L and SS of 400 mg/L, could be treated with a single SBR cycle to about 200 mg/L COD, single-digit BOD5 values, and SS of about 30 mg/L as evaluated at steady-state conditions. Despite the significant variations in values of the influent COD, there was no apparent effect on the filtered COD concentrations in the treated effluent. About 90 to 94% of the unfiltered influent COD was removed, and more than 98% of the BOD5 was removed. These are extremely high removal efficiencies. The reaction kinetics during the react period of a steady-state system was determined to be a first-order reaction. The oxygen uptake rate (OUR) and specific oxygen utilization rate (SOUR) at the beginning of the react period were 4.32g O2/(L×d) and 0.64 O2/(g MLSS×d), respectively; much higher than the corresponding values of 0.89g O2/(L×d) and 0.13 O2/(g MLSS×d) measured near the end of the period, reflecting the fact that the batch process created a feast/famine cycle in the system with the substrate removal rate substantially higher at the start of aeration. Despite the encouraging results, certain scale-up parameters need to be defined before its practical application is possible.

並列關鍵字

sequencing batch reactor ； activated sludge process ； effluent treatment ； OCC mill effluent ； OCC mill