摘要
糖蜜废水厌氧出水是一种高化学需氧量(COD)、高色度的有机废水,属于处理难度较大的废水。本文研究和对比了水解酸化与好氧处理联用技术、活性炭吸附、硅藻土过滤、电絮凝技术和好氧与电絮凝联用技术五种工艺路线对该废水的COD及色度的去除效果,优化了工艺条件并进行了经济核算,最后进一步考察了电絮凝技术对废水其他指标的影响。
工艺路线的选择实验表明:水解酸化与好氧处理联用时,COD及色度的最大去除率分别为17.78%、1.8%;活性炭吸附对该废水COD及色度的最大去除率分别为17.9%、39.3%;硅藻土过滤对该废水COD及色度的最大去除率分别为1.56%、2.7%;电絮凝处理该废水时,COD及色度的最大去除率分别为48.02%、63.66%,但产生大量泡沫堵塞反应器,将废水稀释十倍后再进行电絮凝处理,解决了泡沫问题,COD及色度的去除率分别为65.1%、74.2%。此外,以铝板为阳极,进一步研究了二、三级电絮凝处理该废水的效果,研究结果表明:COD及色度的去除率最高分别可达77.4%、95.8%和85.1%、98.5%。
根据实际水样情况,进一步研究了好氧与电絮凝联用工艺,实验结果表明:好氧处理阶段,COD及色度分别从1410 mg/L、700倍降到821 mg/L、650倍;随后的电絮凝实验表明:极板距离越小处理效果越好,但太小不易搅拌均匀,确定极板间距为3 cm;废水自身pH为7.83,即处于最佳条件内;提高电流密度和延长电解时间均有利于COD及色度的去除;对于一级电絮凝,铁板为阳极板时的处理效果优于以铝板为极板的情况,出水COD及色度最低分别可达172 mg/L、20倍;此外,电絮凝级数越高,处理效果越好;但从经济性方面考虑,铝板为阳极时的电絮凝费用要低于铁板的费用。另外,电絮凝处理会去除部分氨氮,降低废水的电导率,但会使废水的pH升高,在以铝板为极板的一级电絮凝处理时,电解30 min后,pH由7.83上升至10.82。
Molasses wastewater as an organic wastewater from the anaerobic effluent, being higher chemical oxygen demand (COD) and dark brown chroma is extremely difficult to be disposed. In this study, COD and chroma removal of the wastewater were investigated involved on the five processes, including the combination of hydrolysis acidification and aerobic treatment, the adsorption of activated carbon, diatomite filtration, electrocoagulation treatment and the combination of aerobic treatment and electrocoagulation. And, the process conditions were optimized and cost was taken into account. Furthermore, the effect of electrocoagulation technology on other characterization of wastewater was investigated.
By comparing the COD and chroma removal in five treatment processes, it is shown that COD and chroma removal efficiencies were up to 17.78% and 1.8% respectively when the combination of hydrolysis acidification and aerobic treatment was used and those of activated carbon adsorption and diatomite filtration were respectively 17.9% and 39.3%, 1.56% and 2.7%. Those of electrocoagulation technology were 48.02% and 63.66%, but it produced large amounts of foam which blocked the reactor. The problem was solved by diluting ten-fold for raw wastewater, COD and chroma removal efficiencies were respectively improved to 65.1% and 74.2%. In addition, the effect of secondary and tertiary electrocoagulation technology on COD and chroma removal efficiencies were carried out, and it csn rise up to 77.4% and 95.8%, 85.1% and 98.5% using an aluminum anode respectively.
According to the characterization of actual raw wastewater, the combination of aerobic treatment and electrocoagulation technology was used. The results showed that COD decreased to 821 mg/L from 1410 mg/L and chroma was down to 650 times from 700 times in the aerobic treatment periods. In electrocoagulation treatment periods, the smaller the electrode distance was, the better the removal efficiency was, but too much would lead to the non-uniform stirring. So the optimal condition was electrode distance of 3 cm. And suitable pH of the wastewater was itself 7.83. Higher current density and longer electrolysis time benifited COD and chroma removal. The removal efficiency with an iron anode was superior to that of an aluminum anode for primary electrocoagulation, and COD and chroma of effluent can respectively reach 172 mg/L and 20 times. Furthermore, the more the electrocoagulation order was, the better the removal efficiency was. Taken into account economic view, electrocoagulation cost with iron anode was higher than that of aluminum anode. In addition, the concentration of NH3-N and the conductivity of the solution reduced, but pH was up to 10.82 from 7.83 in 30 minutes using aluminum anode for primary electrocoagulation.
引文
[1]李德光,李羚,李丽.甘蔗糖蜜酒精废水-排量及治理现状调查[J].环境科学导报,2010,29(3):71-73.
[2]王英辉,薛瑞,伍婷婷,等.甘蔗糖蜜酒精废液综合治理与资源化利用[J].广西轻工业,2010,25(11):75-77.
[3]成官文,王敦球,李金城,等.我国糖业废水处理进展及其污染防治对策[J].桂林工学院学报,2000,20(5):52-56.
[4]蔡春林,覃文庆,邱冠周,等.甘蔗糖蜜酒精废水治理及展望[J].农业环境科学学报,2006,25(9):831-834.
[5]卢平,曾丽璇.糖蜜酒精废水治理现状及展望[J].环境污染治理技术与设备,2000,1(1):52-55.
[6]周素华.日本糖蜜酒精废液处理技术[J].酿酒科技,2003,24(3):90-91.
[7]吴振强,梁世中.糖蜜酒精蒸馏废液色素研究[J].环境污染与防治,2002,24(1):13-16.
[8]吴烈善,杨希,罗锴,等.糖蜜酒精废液的脱色实验研究[J].中国酿造,2009,22(7):117-120.
[9]魏桃员,张素琴.糖蜜酒精废液生态治理探讨[J].环境与开发,2001,16(1):26-28.
[10]郭萍,蒋细良,田云龙,等.酒精废液清洁处理技术评析[J].农业环境科学学报,2006,25(10):378-381.
[11]戎秋涛,杨春茂,徐文彬,等.土壤酸化研究进展[J].地球科学进展,1996,11(4):396-401.
[12]陈玉谷,李艳,王庭放,等.UASB反应器处理酒精废液颗粒污泥形成过程的研究[J].环境科学学报,1994,14(1):113-118.
[13]Fischer K, Bipp H P, Riemschneider P, et al. Utilization of biomass residues for the remediation of metal-polluted soiles[J]. Environmental Science & Technology, 1998, 32(14): 2154-2161.
[14]Boe K, Angelidaki I. Anaerobic co-digestion of desugared molasses with cow manure[J]. Bioresoutce Technology, 2010, 34(9): 1-7.
[15]Jimenez A M, Borja R, Marth A. Anerobic-anaerobic biodegradation of beet molasses alcoholic fermentation wastewater[J]. Process Biochemistry, 2003, 38(8): 1275-1284.
[16]Jenicek P, Zabranska J, Dohanyos M. Anaerobic treatment of distillery slops in the circumstances of central europe[J]. Water Science and Technology, 1994,30(3): 157-160.
[17]Yeoh B G. Two-phase anaerobic treatment of cane molasses alcohol stillage[J]. Water Science and Technology, 1997, 36(6-7): 441-448.
[18]Mathur A. Anaerobic filtration of adistillery waste[J]. Effluentand Treatment Journal, 1986, 26(3-4): 89-91.
[19]Seth R, Goyal S K, Handa B K. Fixed film biomethanation of distillery spentwash using low cost porous media[J]. Resources Conservation and Recycling, 1995, 14(2): 79-89.
[20]Denac M, Dunn I J. Packed and fluidized-bed biofilm reactor performance for anaerobic wsatewater treatment[J]. Biotechnology and Bioengineering, 1988, 32 (2): 159-173.
[21]李胜超.当前我区甘蔗糖厂酒精废液几种处理方法的调查.广西轻工业,1999,16(3):43-46.
[22]刘琴,张敬东.UASB处理高浓度糖蜜酒精废液的研究进展[J].酿酒科技,2005,26(11):95-98.
[23]张家振,王太平,谷成.两相UASB反应器处理糖蜜酒精糟液的试验研究[J].工业用水与废水,2002,33(4):29-31.
[24]张萍,李丽芳,解庆林.生物-化学法综合处理糖蜜酒精废水实验研究[J].桂林工学院学报,2005,25(2):237-241.
[25]陈玉谷,李艳.UASB反应器处理酒精废液颗粒污泥形成过程的研究[J].环境科学学报,1994,14(1):113-118.
[26]赵亚乾,邱熔处.高负荷UASB反应器处理酒糟污水[J].水处理技术,1991,17(2):112-117.
[27]韦雪梅,梁近光.新型UASB工艺治理糖蜜酒精废液的试验研究[J].广西轻工业,2009,26(5):68-70.
[28]刘雅巍,张春青,池勇志.处理难生物降解有机物的厌氧颗粒污泥形成的技术进展,2004,10(4):263-265.
[29]龚云峰,杜建村.酒精废液治理工程实例-EGSB+生化+物化处理工艺[J].宁波化工,2005,34(1):33-35.
[30]贺延龄.废水厌氧生物处理[M].北京:中国轻工业出版社,1998.
[31]张仁江,张振家,谷成.糖蜜酒精废水两相UASB处理有机物去除特征[J].城市环境与城市生态,2000,13(4):23-25.
[32]秦麟源,刘锦珠.糖蜜酒精废液的二段厌氧法处理[J].上海环境学,1989,8(4):11-14.
[33]任南琪,王宝贞,马放.有机废水产酸发酵的生理生态学分析[J].中国沼气,1995,13(1):1-6.
[34]麻娟.糖蜜酒精废液的厌氧-好氧生化处理及脱色研究[J].大众科技,2009,11(11):92-93.
[35]张敏,王凯,黎方强.酒精厂糖蜜酒精废水处理工程技术改造及其特点[J ].中国沼气,1997,15(4):30-34.
[36]国家环境保护局科技处,清华大学环境工程系编.我国几种工业废水处理技术研究(高浓度有机废水) [M].化学工业出版社,1988.
[37]刘自力,刘红梅.Bi2O3-WO3光催化臭氧氧化降解糖蜜酒精废水的研究[J].分子催化,2007,21(6):550-555.
[38]陈孟林,夏慧丽,何星存,等.催化湿式氧化法处理糖蜜酒精废液的研究[J].环境污染治理技术与设备,2005,6(12):82-85.
[39]周小波,蔡迎晨,杨健.酒精废水Fenton试剂催化氧化法试验研究[J].青岛理工大学学报,2007,28(1):65-69.
[40]曾玉凤,刘自力,秦祖增,等.超声波协同Fenton试剂降解糖蜜酒精废水的工艺[J].工业水处理,2007,27(7):67-70.
[41]成官文,章非娟,廖雷,等.甘蔗糖蜜酒精废液生物过程尾水的物化处理[J].桂林工学院学报,2004,24(1):93-96.
[42]吴烈善,杨希,罗锴,等.糖蜜酒精废液的脱色实验研究[J].中国酿造,2009,28(7):117-120.
[43]夏慧丽,陈孟林,喻赛波,等.糖蜜酒精废液的两步脱色及色素的回收利用[J].工业水处理,2004,24(6):29-31.
[44]冯冰凌,袁荣华,冼萍.木质素对糖蜜酒精废液的脱色效果[J].工业水处理,2005,25(12):21-23.
[45]周桂,邓光辉,何子平.腐植酸在糖蜜酒精废液处理中的应用[J].广西轻工业,2001,18(4):28-30.
[46]魏光涛,李仲民,廖丹葵,等.改性膨润土吸附脱色糖蜜酒精废液的研究[J].高校化学工程学报,2004,18(4):414-419.
[47]魏倩倩,童群义.交联阳离子淀粉对糖蜜酒精废液的脱色性能研究[J].广西大学学报(自然科学版),2007,33(4):380-383.
[48]梁慧阳,李坚斌,陆海勤,等.超声强化臭氧氧化糖蜜酒精废液的脱色研究[J].食品科技,2010,35(9):101-104.
[49]粟海锋,黎可纯,文衍宣,等.软锰矿氧化脱色降解糖蜜酒精废液[J].化学工程,2009,37(6):66-70.
[50]游少鸿,纪宏达,解庆林,等.类Fenton试剂深度处理糖蜜酒精废水[J].化工进展,2010,29(2):362-364.
[51]陈文纳,周国华,吴雪文,等.用无机絮凝剂处理酒精生产废水[J].环境保护,1994,22(4):8-9.
[52]魏东,郭祀远,李琳.糖蜜的发酵废水石灰絮凝预处理及其培养螺旋藻的研究.华南理工大学学报(自然科学版),1997,25(12):89-93.
[53]Kim S J, Shoda M. Batch decolorization of molasses by suspended and immobilized fungus of Geotrichum candidum[J]. Journal of Bioscience and Bioengineering, 1999, 85(5): 586-589.
[54]Kim S J, Seong A. Decolorization of molasses and a dye by a newly isolated strain of the fungus Geotrichum candidum[J]. Biotechnology and Bioengineering, 1999, 62(1): 114-119.
[55]Guimaraes C, Bento L S, Mota M. Biodegradation of colorants in refinery effluents[J]. International Sugar Journal, 1999, 101(5): 246-251.
[56]李仲民,童张法.超滤法处理糖蜜酒精废液的研究[J].广西大学学报(自然科学版),2001,26(3):171-174.
[57]侯文华.利用酒精生产饲料蛋白的菌种选育[J].环境科学,1999,24(1):77-79.
[58]李清解.糖蜜酒精废液的处理和利用[J].广西化工,1990,19(1):55-59.
[59]张书文,于春慧.从甜菜糖蜜发酵废液中提取色素及甘油的工艺[J].化学世界,2002,57(4):197-199.
[60]陆浩恬,廖建辉,梁秉华.试论从酒精废液提取甘油[J].甘蔗糖业,1993,22(3):47-49.
[61]王吉华,李月秀.甘蔗糖厂酒精废液提取食用色素的研究[J].精细化工,1998,15(4):59-61.
[62]王相宜.厌氧处理造纸黑液和糖蜜酒精废液混合废水[J].轻工环保,1990,12(2):33-36.
[63]张以忱,钱炯,左继承,等.电絮凝水处理技术阳极优化的研究[J].工业水处理,2007,27(3):4-6.
[64]Dinogol A, Akbulut H Y, Cihan F, et al. Petrochemical wastewater treatment by means of clean electrochemical technologies[J]. Clean Technology and Environmental Policy, 2004, 12(4): 288-295.
[65]Gabriela R M, Eduardo C M, Aguilera C, et al. Aluminum electrocoagulation with peroxide applied to wastewater from pasta and cookie processing[J]. Separation and Purification Technology, 2007, 54(1): 124-129.
[66]Bektas N, Oncel S, Akbulut H Y, et al. Removal of boron by electrocogulation[J]. Environmental Chemical Letters, 2004, 32(2): 51-54.
[67]刘峥,韩国成,王永燎.钛-铁双阳极电絮凝法去除电镀废水中的铬(Ⅵ)[J].工业水处理,2007,27(10):51-55.
[68]刘海军,王龙,尹倩倩,等.电絮凝处理含油废水试验研究[J].水科学与工程技术,2008,32(1):30-31.
[69]梁吉艳,杨蕴哲,胡筱敏.铁阳极电絮凝处理活性黑KN-B染料废水动力学分析[J].环境科学与技术,2008,31(1):90-93.
[70]何志桥,裘建平,宋爽,等.臭氧强化电絮凝处理直接耐晒大红4BS模拟染料废水[J].化工学报,2007,58(10):2573-2579.
[71]王刚,李敬苗,丁忠浩.电凝聚法在垃圾渗滤液处理中的应用[J].环境科学与技术,2006,29(8):80-83.
[72]李长海.导流电凝聚法脱除印染废水色度的研究[J].化工环保,1999,19(5): 264-268.
[73]曾抗美,史建福,杨志山,等.用电絮凝法制备给水[J].水处理技术,1997,23(3):169-174.
[74]王三反,李桂荣,于连群,等.高浊度水二级电凝聚处理工艺[J].给水排水,1996,22(3):11-15.
[75]Guven G, Perendeci A, Tanyolac A. Electrochemical treatment of simulated beet sugar factory wastewater[J]. Chemical Engineering Joutnal, 2009, 151(1-3): 149-159.