基于RSM模型对厌氧消化污泥脱水性能改善研究
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摘要
文章研究了超声波、芬顿试剂耦合叶腊石对生物乙醇厌氧消化污泥脱水性能的影响。以离心沉降比和滤饼含水率为评价指标进行单因素实验,得出单因素影响脱水性能的最佳范围,然后以响应曲面优化法(RSM)为依据的Box-Behnken多因素实验,建立了离心沉降比和滤饼含水率二次多项预测模型,得到耦合处理的最佳处理参数。结果表明,耦合处理能明显提高污泥脱水性能,超声波、芬顿试剂和叶腊石的最佳处理值分别为30 s、2 mg/g和0.3 g/m L,此时污泥离心沉降比和滤饼含水率的减少率分别取得最大值53%和74%,验证实验结果表明:离心沉降比减少率为(54.32±0.45)%,滤饼含水率为(74.23±0.32)%,与模型预测值基本吻合。电镜图片和热重分析也证实污泥脱水性能的改善。
Aiming to improving dewaterability of anaerobic digested sludge from bioethanol production, this experimental study focused on a process of ultrasound/Fenton reagent coupling pyrophyllite. Firstly, the experiment was conducted to obtain a range of optimized values through the single factor test, in which the centrifugal settling ratio(CSR) and water content(WC) of sludge cake were regarded as evaluation index; secondly, on the basis of the RSM(response surface method) BoxBehnken multi-factor experiment was conducted to set up the quadratic polynomial predication model of CSR and WC, and then the optimum coupling parameters for dewaterability were acquired. Consequently, the experiment showed that the process of ultrasound/Fenton reagent coupling pyrophyllite could remarkably upgrade the sludge dewaterability, and under the optimized condition CSR of 53% and WC of 74% could be achieved: the optimized value for ultrasound was 30 s, and dosages of Fenton reagent and pyrophyllite were 2 mg/g and 0.3 g/m L, respectively. Additionally, the verification test conducted showed that the values obtained by the experiment(CSR decrement rate:(54.32±0.45)%, WC:(74.23±0.32)%) were coincided with the predicted values by the model.
Aiming to improving dewaterability of anaerobic digested sludge from bioethanol production, this experimental study focused on a process of ultrasound/Fenton reagent coupling pyrophyllite. Firstly, the experiment was conducted to obtain a range of optimized values through the single factor test, in which the centrifugal settling ratio(CSR) and water content(WC) of sludge cake were regarded as evaluation index; secondly, on the basis of the RSM(response surface method) BoxBehnken multi-factor experiment was conducted to set up the quadratic polynomial predication model of CSR and WC, and then the optimum coupling parameters for dewaterability were acquired. Consequently, the experiment showed that the process of ultrasound/Fenton reagent coupling pyrophyllite could remarkably upgrade the sludge dewaterability, and under the optimized condition CSR of 53% and WC of 74% could be achieved: the optimized value for ultrasound was 30 s, and dosages of Fenton reagent and pyrophyllite were 2 mg/g and 0.3 g/m L, respectively. Additionally, the verification test conducted showed that the values obtained by the experiment(CSR decrement rate:(54.32±0.45)%, WC:(74.23±0.32)%) were coincided with the predicted values by the model.
引文
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[19]邢奕,王志强,洪晨,等.基于RSM模型对污泥联合调理的参数优化[J].中国环境科学,2014,34(11):2866-2873.Xing Yi,Wang Zhiqiang,Hong Chen,et al.Parameter optimization of sludge co-conditioning based on RSM model[J].China Environmental Science,2014,34(11):2866-2873.
[2]Wu May,Zhang Zhonglong,Chiu Yiwen.Life cycle water quantity and water quality implications of biofuels[J].Current Sustainable Renewable Energy Reports,2014(1):3–10.
[3]Rai C L,Struenkmann G,Mueller J,et al.Influence of ultrasonic disintegration on sludge growth reduction and its estimation by respirometry[J].Environmental Science and Technology,2004,38(21):5779-578.
[4]宫常修,蒋建国,杨世辉.超声波耦合Fenton氧化对污泥破解效果的研究:以粒径和溶解性物质为例[J].中国环境科学,2013,33(2):293-297.Gong Changxiu,Jiang Jianguo,Yang Shihui.Effects of Fenton oxidation with ultrasonic coupling on sludge particle size and soluble substances[J].China Environmental Science,2013,33(2):293-297.
[5]Wiln B M,Jin B,Lant P.Impacts of structural characteristics on activated sludge floc stability[J].Water Research,2003,37(15):3632-3645.
[6]Chen Changya,Zhang Panyue,Zeng Guangming,et al.Sewage sludge conditioning with coal fly ash modified by sulfuric acid[J].Chemical Engineering Journal,2010,158(3):616-622.
[7]Wang F,Ji M,Lu S.Influence of ultrasonic disintegration on the dewaterability of waste activated sludge[J].Environmental Progress,2006,25(3):257-260.
[8]薛向东,金奇庭,朱文芳,等.超声对污泥流变性及絮凝脱水性的影响[J].环境科学学报,2006,26(6):897-902.Xue Xiangdong,Jin Qiting,Zhu Wenfang,et al.Influence of ultrasound on the rheological characterization and flocculating dewaterability of sludge[J].Acta Scientiae Circumtantiae,2006,26(6):897-902.
[9]Liu Huan,Yang Jiakuan,Shi Yafei,et al.Conditioning of sewage sludge by Fenton's reagent combined with skeleton builders[J].Chemosphere,2012,88(2):235-239.
[10]He Dongqin,Wang Longfei,Jiang Hong,et al.A Fentonlike process for the enhanced activated sludge dewatering[J].Chemical Engineering Journal,2015(272):128–134.
[11]Dewil R,Baeyens J,Neyens E.Fenton peroxidation improves the drying performance of waste activated sludge[J].Hazard Mater,2005,177(2/3):161-170.
[12]Xu Hang,Shen Kunlun,Ding Tonggang,et al.Dewatering of drinking water treatment sludge using the Fenton-like process induced by electro-osmosis[J].Chemical Engineering Journal,2016(293):207–215.
[13]Rodríguez-Chueca J,Mediano A,Ormad M P,et al.Ovelleiro,disinfection of wastewater effluents with the Fentonlike process induced by electromagnetic fields[J].Water Research,2014(60):250–258.
[14]徐慧敏,何国富,戴翎翎,等.低温热水解和超声联合破解污泥优化工艺的参数研究[J].中国环境科学,2016,36(4):1093-1098.Xu Huimin,He Guofu,Dai Lingling,et al.Optimizing parameters of sludge disruption by combined low temperature thermal and ultrasonic pretreatment through response surface methodology[J].China Environmental Science,2016,36(4):1093-1098.
[15]邢奕,王志强,洪晨,等.芬顿试剂与DDBAC联合调理污泥的工艺优化[J].中国环境科学,2015,35(4):1164-1172.Xing Yi,Wang Zhiqiang,Hong Chen,et al.Technological optimization of sludge conditioned by Fenton’s reagencombined with surfactant[J].China Environmental Science,2016,36(4):1093-1098.
[16]Priyadarshini R,Vaishnavi L,Murugan D,et al.Kinetic studies on anaerobic co-digestion of ultrasonic disintegrated feed and biomass and its effect substantiated by microcalorimetry[J].International Journal of Environmental Science and Technology,2015,12(9):3029-3038.
[17]马俊伟,刘杰伟,曹芮,等.Fenton试剂与CPAM联合调理对污泥脱水效果的影响研究[J].环境科学,2013,34(9):3538-3543.Ma Junwei,Liu Jiewei,Cao Rui,et al.Sludge dewaterability with combined conditioning using Fenton’s reagent and CPAM[J].Environmental Science,2013,34(9):3538-3543.
[18]李亚林,刘蕾,李钢,等.基于Fenton高级氧化-骨架构建体污泥深度脱水研究[J].水处理技术,2016,42(5):69-81.Li Yalin,Liu Lei,Li Gang,et al.Research on sewage sludge deep-dewatering by conditioning with combing Fenton advanced oxidation and skelton buliders[J].Technology of Water Treatment,2016,42(5):69-81.
[19]邢奕,王志强,洪晨,等.基于RSM模型对污泥联合调理的参数优化[J].中国环境科学,2014,34(11):2866-2873.Xing Yi,Wang Zhiqiang,Hong Chen,et al.Parameter optimization of sludge co-conditioning based on RSM model[J].China Environmental Science,2014,34(11):2866-2873.
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