不同类型污泥中非溶解性有机物水解产酸特性研究
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摘要
分别以化学生物絮凝污泥(以下简称絮凝污泥)、初沉污泥和剩余污泥3种污泥为基质,对比研究了不同类型污泥中的非溶解性有机物的水解产酸特性,并进一步考察了水解酸化产物挥发性脂肪酸(VFAs)的产量和组成。结果表明,与初沉污泥和剩余污泥相比,絮凝污泥的水解酸化性能最优,稳定运行期间,絮凝污泥单位质量挥发性悬浮固体(VSS)的VFAs产量为(410.3±26.8)mg/g,分别为初沉污泥和剩余污泥的1.2、1.9倍。此外,絮凝污泥水解酸化产生的VFAs结构最优,乙酸占VFAs的比例高达64.3%(质量分数),絮凝污泥水解产酸发酵液中C/N、C/P均远高于典型城镇污水处理厂生化处理系统进水需求,可以作为后续生物脱氮除磷过程的优质补充碳源。
The biochemical flocculation sludge(hereafter called flocculation sludge for short),primary sludge and residual sludge were selected as substrate to study the difference of hydrolysis and acidification of insoluble organic matters in these different types of sludge.The production and composition of volatile fatty acids(VFAs)during the hydrolysis and acidification process were further analyzed.Result showed that compared with primary sludge and residual sludge,the flocculation sludge had better hydrolysis and acidification performance.During the stable operation period,the VFAs production per volatile suspend solid(VSS)of flocculation sludge was(410.3±26.8)mg/g,which was 1.2 times and 1.9 times of that generated by primary sludge and residual sludge.In addition,the structure of VFAs produced by flocculation sludge was most optimal,and the proportion of acetic acid in total VFAs was as high as 64.3%.The C/N and C/P in the hydrolyzed fermentation broth of flocculation sludge were significantly higher than that were demanded in the bio-chemical treatment system of typical urban wastewater treatment plants.Therefore,alternative efficient carbon source could be obtained from flocculation sludge through the technology of hydrolysis and acidification.
The biochemical flocculation sludge(hereafter called flocculation sludge for short),primary sludge and residual sludge were selected as substrate to study the difference of hydrolysis and acidification of insoluble organic matters in these different types of sludge.The production and composition of volatile fatty acids(VFAs)during the hydrolysis and acidification process were further analyzed.Result showed that compared with primary sludge and residual sludge,the flocculation sludge had better hydrolysis and acidification performance.During the stable operation period,the VFAs production per volatile suspend solid(VSS)of flocculation sludge was(410.3±26.8)mg/g,which was 1.2 times and 1.9 times of that generated by primary sludge and residual sludge.In addition,the structure of VFAs produced by flocculation sludge was most optimal,and the proportion of acetic acid in total VFAs was as high as 64.3%.The C/N and C/P in the hydrolyzed fermentation broth of flocculation sludge were significantly higher than that were demanded in the bio-chemical treatment system of typical urban wastewater treatment plants.Therefore,alternative efficient carbon source could be obtained from flocculation sludge through the technology of hydrolysis and acidification.
引文
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[20]LIM S J,KIM B J,JEONG C M,et al.Anaerobic organic acid production of food waste in once-a-day feeding and drawingoff bioreactor[J].Bioresource Technology,2008,99(16):7866-7874.
[2]YUAN H,CHEN Y,ZHANG H,et al.Improved bioproduction of short-chain fatty acids(SCFAs)from excess sludge under alkaline conditions[J].Environmental Science&Technology,2006,40(6).
[3]WU H Y,GAO J Y,YANG D H,et al.Alkaline fermentation of primary sludge for short-chain fatty acids accumulation and mechanism[J].Chemical Engineering Journal,2010,160(1):1-7.
[4]刘东方,白思琴,韩磊,等.初沉污泥球磨破解后水解酸化研究[J].环境污染与防治,2012,34(9).
[5]YUAN Q,BARANOWSKI M,OLESZKIEWICZ J A.Effect of sludge type on the fermentation products[J].Chemosphere,2010,80(4).
[6]饶应福,夏四清,陈轶波,等.化学生物絮凝工艺污染物去除试验研究[J].环境科学与技术,2006,29(1):10-11.
[7]ZHANG P,CHEN Y,ZHOU Q.Waste activated sludge hydrolysis and short-chain fatty acids accumulation under mesophilic and thermophilic conditions:effect of pH[J].Water Research,2009,43(15):3735-3742.
[8]MU H,CHEN Y.Long-term effect of ZnO nanoparticles on waste activated sludge anaerobic digestion[J].Water Research,2011,45(17):5612-5620.
[9]SOSMOWSKI P,WIECZOREK A,LEDAKOWICZ S.Anaerobic co-digestion of sewage sludge and organic fraction of municipal solid wastes[J].Advances in Environmental Research,2003,7(3):609-616.
[10]AGDAG O N,SPONZA D T.Co-digestion of mixed industrial sludge with municipal solid wastes in anaerobic simulated landfilling bioreactors[J].Journal of Hazardous Materials,2005,40(5):1871-1879.
[11]TANAKA S,KOBAYASHI T,KAMIYAMA K I,et al.Effects of thermochemical pretreatment on the anaerobic digestion of waste activated sludge[J].Water Science&Technology,1997,35(8):209-215.
[12]FENG L,CHEN Y,ZHENG X.Enhancement of waste activated sludge protein conversion and volatile fatty acids accumulation during waste activated sludge anaerobic fermentation by carbohydrate substrate addition:the effect of pH[J].Environmental Science&Technology,2009,43(12):4373-4380.
[13]WU H,GAO J,YANG D,et al.Alkaline fermentation of primary sludge for short-chain fatty acids accumulation and mechanism[J].Chemical Engineering Journal,2010,160(1):1-7.
[14]汪家权,夏雪兰,陈少华,等.两类微生物燃料电池治理硝酸盐废水的实验研究[J].环境科学学报,2011,31(2):254-259.
[15]BOUALLAGUI H,MAROUANI L,HAMDI M.Performances comparison between laboratory and full-scale anaerobic digesters treating a mixture of primary and waste activated sludge[J].Resources Conservation&Recycling,2011,55(1):29-33.
[16]MCMAHON K D,STROOT P G,MACKIE R I,et al.Anaerobic codigestion of municipal solid waste and biosolids under various mixing conditions-Ⅱ:microbial population dynamics[J].Water Research,2001,35(7):1804-1816.
[17]LIU X,LIU H,CHEN Y,et al.Effects of organic matter and initial carbon-nitrogen ratio on the bioconversion of volatile fatty acids from sewage sludge[J].Journal of Chemical Technology&Biotechnology Biotechnology,2010,83(7):1049-1055.
[18]OEHMEN A,YUAN Z,BLACKALL L L,et al.Short-term effects of carbon source on the competition of polyphosphate accumulating organisms and glycogen accumulating organisms[J].Water Science&Technology,2004,50(10):139-144.
[19]苏高强,彭永臻,汪传新,等.污泥类型对污泥碱性发酵的影响[J].化工学报,2011,62(12):3492-3497.
[20]LIM S J,KIM B J,JEONG C M,et al.Anaerobic organic acid production of food waste in once-a-day feeding and drawingoff bioreactor[J].Bioresource Technology,2008,99(16):7866-7874.