【摘要】：纖維素乙醇廢水一般具有高濃度、高鹽度、強酸性、刺鼻氣味、高色度、高濁度的特點,且廢水中通常含有木質素等難降解類物質,纖維素乙醇廢水是一種典型的高濃度工業(yè)有機廢水。目前,纖維素乙醇廢水已成為制約纖維素乙醇生產工業(yè)發(fā)展的影響因素,如何經濟、有效的處理纖維素乙醇廢水這一難題亟需解決。采用生物厭氧處理和好氧處理纖維素乙醇廢水后,難降解有機污染物質仍然存在于二級生化出水中,未被有效去除,使出水無法達到國家關于纖維素乙醇廢水的排放要求。因此,本研究采用物化方法,對纖維素乙醇厭氧生化出水進行強化處理,同時對二級生化出水進行深度處理,從而使出水達標排放。本文以纖維素乙醇廢水厭氧出水作為強化處理對象,通過對比混凝法、Fenton氧化法及臭氧氧化法的強化處理效果,篩選出最為合適的強化處理方法,并通過試驗考察該方法影響因素對處理效果的影響,確定最佳工藝參數(shù)。深度處理對象為二級生化出水,通過試驗從臭氧氧化法和Fenton氧化法中篩選出較優(yōu)方法,并考察其處理效果受不同因素的影響,確定最優(yōu)反應條件。強化處理部分擴大至中試規(guī)模,通過考察反應條件對處理效果的影響確定最優(yōu)工藝參數(shù),并據(jù)此進行經濟分析。臭氧氧化法是對纖維素乙醇廢水厭氧出水進行強化處理較為合適的方法。反應時間、臭氧投加量、初始p H值和反應溫度對強化處理效果均有不同程度的影響。在最優(yōu)反應條件(臭氧投加量為5 g/h、反應溫度為30℃、初始p H值為10、反應時間為80 min)下,COD去除率可達35%,氨氮去除率可達45%,BOD/COD可提高到0.325。在中試臭氧氧化強化處理過程中,當水力停留時間為140 min、臭氧投加量為6 g/h時,出水可生化性顯著提高,BOD/COD值提高到約0.26。Fenton氧化法是最為合適的深度處理方法。初始p H值、H2O2/COD值、Fe2+/H2O2值、反應時間和反應溫度對Fenton氧化法深度處理效果均有不同程度的影響。深度處理的最佳工藝條件為:初始p H值為3、H2O2/COD值為2.8、Fe2+/H2O2值為0.67、反應時間為3 h、常溫或室溫下進行反應。在該反應條件下深度處理出水COD穩(wěn)定低于100 mg/L,氨氮穩(wěn)定低于4 mg/L,出水中幾乎不含有濁度,達到了國家關于纖維素乙醇廢水的排放標準。該廠擬建項目高濃度廢水產量為2111 t/d,臭氧氧化法強化處理成本較低,其中設備投資約63.0萬元,年運行費用約30.9萬元。Fenton氧化技術深度處理工藝的設備投資費用為20.0萬元,噸水運行成本為69.96元。
[Abstract]:Cellulose ethanol wastewater has the characteristics of high concentration, high salinity, strong acidity, pungent smell, high color and high turbidity. Cellulose ethanol wastewater is a typical high concentration industrial organic wastewater. At present, cellulosic ethanol wastewater has become the influence factor that restricts the development of cellulosic ethanol production industry. How to treat cellulosic ethanol wastewater effectively is an urgent problem to be solved. After biological anaerobic treatment and aerobic treatment of cellulosic ethanol wastewater, the refractory organic pollutants still exist in the secondary biochemical effluent, which are not effectively removed, so that the effluent can not meet the national discharge requirements of cellulose ethanol wastewater. Therefore, the method of physicochemical treatment was used to enhance the treatment of cellulose ethanol anaerobic effluent, and at the same time, advanced treatment was carried out on the secondary biochemical effluent, so that the effluent could be discharged up to standard. In this paper, the anaerobic effluent from cellulosic ethanol wastewater was taken as the object of enhanced treatment. By comparing the effect of Fenton oxidation and ozone oxidation, the most suitable enhanced treatment method was selected. The influence factors of the method on the treatment effect were investigated and the optimum process parameters were determined. The advanced treatment object is secondary biochemical effluent. The optimum reaction conditions are determined by screening the better method from the ozone oxidation and Fenton oxidation methods, and investigating the influence of different factors on the treatment effect. The reinforcement treatment was expanded to the scale of the pilot scale, and the optimal process parameters were determined by investigating the effect of reaction conditions on the treatment effect, and the economic analysis was carried out accordingly. Ozone oxidation is an appropriate method for the enhanced treatment of cellulose ethanol wastewater. The effects of reaction time, ozone dosage, initial pH value and reaction temperature on the strengthening effect were different. Under the optimum reaction conditions (ozone dosage is 5 g / h, reaction temperature is 30 鈩，

本文編號：2207759