脱硫石膏耦合微波对生产燃料乙醇厌氧消化污泥脱水性能的影响
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摘要
为使污泥脱水后资源化农用,利用微波在不同功率(800、640和560 W)和时间(60、120和180 s)条件下,耦合脱硫石膏(2、4、6和8 g·L~(-1))对燃料乙醇厌氧消化污泥(ADSFE)脱水性能改善进行研究,探讨其脱水效果及相关机理。结果表明,最佳条件是脱硫石膏(6 g·L~(-1))耦合微波(640 W,120 s)处理。在最佳处理条件下,污泥比阻(SRF)下降至1.05×10~(12)m·kg~(-1),与原污泥相比降低了87.5%,与单独加入脱硫石膏相比降低了77.80%,与单独微波调理相比降低了75.60%。此外,扫描电镜(SEM)表明耦合调理后的ADSFE形成致密且具有较大孔径的絮体,易实现固液分离;热重(TGDTG)曲线显示,脱水起始温度和热重峰明显前移。因此,脱硫石膏与微波协同作用调理ADSFE时,脱水性能明显改善并优于单独调理的效果。同时,处理后污泥有机质含量满足有机肥制备原料要求。
In order to make the sludge dewatering as agricultural resources,microwave in different power (800,640 and 560 W) and time (60,120 and 180 s) coupled with desulfuration gypsum (2,4,6 and 8 g·L~(-1)) was used to improve the dewaterability of fuel ethanol producing anaerobic digestion sludge.The improvement effect and related mechanism were discussed.The results showed the optimal condition was at desulfurization gypsum (6 g·L~(-1)) coupled microwave (640 W,120 s).At the optimum processing conditionss Specific resistance to filtration (SRF) decreased to 1.05 × 10~(12)m·kg~(-1),reduced by 87.5% compared with the original sludge,by77.80% compared with adding desulfurization gypsum and 75.60% compared with microwave alone.In addition,after coupling treatment,scanning electron microscopy (SEM) showed that the flocs tended to be dense and with larger pore size,easy solid-liquid separation.Thermogravimetric (TG-DTG) curves showed that the initial temperature and thermal dehydration peak moved forward.Therefore,with the synthetic effect of desulfurization gypsum and microwave,dewatering performance is obviously improved and better than a separate conditioning effect.At the same time,the organic matter content of sludge can meet the requirement of raw material preparation after treatment.
In order to make the sludge dewatering as agricultural resources,microwave in different power (800,640 and 560 W) and time (60,120 and 180 s) coupled with desulfuration gypsum (2,4,6 and 8 g·L~(-1)) was used to improve the dewaterability of fuel ethanol producing anaerobic digestion sludge.The improvement effect and related mechanism were discussed.The results showed the optimal condition was at desulfurization gypsum (6 g·L~(-1)) coupled microwave (640 W,120 s).At the optimum processing conditionss Specific resistance to filtration (SRF) decreased to 1.05 × 10~(12)m·kg~(-1),reduced by 87.5% compared with the original sludge,by77.80% compared with adding desulfurization gypsum and 75.60% compared with microwave alone.In addition,after coupling treatment,scanning electron microscopy (SEM) showed that the flocs tended to be dense and with larger pore size,easy solid-liquid separation.Thermogravimetric (TG-DTG) curves showed that the initial temperature and thermal dehydration peak moved forward.Therefore,with the synthetic effect of desulfurization gypsum and microwave,dewatering performance is obviously improved and better than a separate conditioning effect.At the same time,the organic matter content of sludge can meet the requirement of raw material preparation after treatment.
引文
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[14]李延吉,李润东,冯磊,等.基于微波辐射研究城市污水污泥脱水特性[J].环境科学研究,2009,22(5):544-548
[15]ESKICIOGLU C,KENNEDY K J,DROSTE R L.Enhanced disinfection and methane production from sewage sludge by microwave irradiation[J].Desalination,2009,248(1):279-285
[16]罗海健,付长亮,宁寻安,等.微波预处理对制革污泥絮凝脱水性能的影响[J].环境工程学报,2013,7(5):1933-1938
[17]FENG X,DENG J C,LEI H Y,et al.Dewaterability of waste activated sludge with ultrasound conditioning[J].Bioresource Technology,2009,100(3):1074-1781
[18]LIU J,WEI Y,LI K,et al.Microwave-acid pretreatment:A potential process for enhancing sludge dewaterability[J].Water Research,2016,90:225-234
[19]杨国友,石林,柴妮.生石灰与微波协同作用对污泥脱水的影响[J].环境化学,2011,30(3):698-702
[20]REN B Z,HOU B L,YANG Y L.A study on the improvement in dewatering of sewag sludge by adding fly ash[J].Environmental Science&Technology,2010,33(S2):184-187
[21]SAJJAD M,KIM K S.Studies on the interactions of Ca2+and Mg2+with EPS and their role in determining the physicochemical characteristics of granular sludges in SBR system[J].Process Biochemistry,2015,50(6):966-972
[22]DA R C,CAVINATO C,PAVAN P,et al.Winery waste recycling through anaerobic co-digestion with waste activated sludge[J].Waste Management,2014,34(11):2028-2035
[23]张强,邢智炜,刘欢,等.不同深度脱水污泥的热解特性及动力学分析[J].环境化学,2013,32(5):839-846
[2]WANG F,XIONG X R,LIU C Z.Biofuels in China:Opportunities and challenges[J].In Vitro Cellular&Developmental Biology-Plant.2009,45(3):342-349
[3]李涛,鲍锦磊,于淼,等.铁炭微电解法深度处理燃料乙醇生产废水[J].环境工程学报,2013,7(3):999-1004
[4]SHEETS J P,YANG L C,GE X M,et al.Beyond land application:emerging technologies for the treatment and reuse of anaerobically digested agricultural and food waste[J].Waste Management,2015,44:94-115
[5]HUA M,WANG B,CHEN L,et al.Verification of lime and water glass stabilized FGD gypsum as road sub-base[J].Fuel,2010,89(8):1812-1817
[6]YAN Y,DONG X,SUN X,et al.Conversion of waste FGD gypsum into hydroxyapatite for removal of Pb2+and Cd2+from wastewater[J].Journal of Colloid&Interface Science.2014,429(9):68-76
[7]LIANG H,SHI L,YANG G.Improving sludge dewaterability by adding the semi-Dry flue gas desulfurization residue under microwave radiation[J].CLEAN-Soil,Air,Water.2015,42(9):1239-1247
[8]邢奕,洪晨,赵凡.脱硫灰调理对污泥脱水性能的影响[J].化工学报,2013,64(5):1810-1818
[9]YAN Y,LI Q,SUN X,et al.Recycling flue gas desulphurization(FGD)gypsum for removal of Pb(Ⅱ)and Cd(Ⅱ)from wastewater[J].Journal of Colloid&Interface Science,2015,457:86-95
[10]杨国友.脱硫灰与微波辐射协同作用改善污泥脱水性能的研究[D].广州:华南理工大学,2011
[11]刘吉宝,倪晓棠,魏源送,等.微波及其组合工艺强化污泥厌氧消化研究[J].环境科学,2014,35(9):3455-3460
[12]林宁波.微波联合过硫酸钠协同调理改善污泥脱水性能研究[D].长沙:湖南大学,2014
[13]傅大放,蔡明元,华建良,等.污水厂污泥微波处理试验研究[J].中国给水排水,1999,15(6):56-57
[14]李延吉,李润东,冯磊,等.基于微波辐射研究城市污水污泥脱水特性[J].环境科学研究,2009,22(5):544-548
[15]ESKICIOGLU C,KENNEDY K J,DROSTE R L.Enhanced disinfection and methane production from sewage sludge by microwave irradiation[J].Desalination,2009,248(1):279-285
[16]罗海健,付长亮,宁寻安,等.微波预处理对制革污泥絮凝脱水性能的影响[J].环境工程学报,2013,7(5):1933-1938
[17]FENG X,DENG J C,LEI H Y,et al.Dewaterability of waste activated sludge with ultrasound conditioning[J].Bioresource Technology,2009,100(3):1074-1781
[18]LIU J,WEI Y,LI K,et al.Microwave-acid pretreatment:A potential process for enhancing sludge dewaterability[J].Water Research,2016,90:225-234
[19]杨国友,石林,柴妮.生石灰与微波协同作用对污泥脱水的影响[J].环境化学,2011,30(3):698-702
[20]REN B Z,HOU B L,YANG Y L.A study on the improvement in dewatering of sewag sludge by adding fly ash[J].Environmental Science&Technology,2010,33(S2):184-187
[21]SAJJAD M,KIM K S.Studies on the interactions of Ca2+and Mg2+with EPS and their role in determining the physicochemical characteristics of granular sludges in SBR system[J].Process Biochemistry,2015,50(6):966-972
[22]DA R C,CAVINATO C,PAVAN P,et al.Winery waste recycling through anaerobic co-digestion with waste activated sludge[J].Waste Management,2014,34(11):2028-2035
[23]张强,邢智炜,刘欢,等.不同深度脱水污泥的热解特性及动力学分析[J].环境化学,2013,32(5):839-846