超声波联合化学调理改善疏浚底泥脱水性能的研究
|
摘要
以长沙市圭塘河疏浚底泥为研究对象,分别采用聚合氯化铝(PAC)、阳离子聚丙烯酰胺(CPAM)和超声波改善疏浚底泥脱水性能。结果表明,单一PAC、CPAM对疏浚底泥脱水性能均有一定程度的改善作用,CPAM效果优于PAC,经两种药剂联合化学调理后,疏浚底泥脱水性能进一步改善,调理结束后疏浚底泥属较易脱水污泥;超声波联合化学调理疏浚污泥时,宜先采用化学调理(先投加3g/L PAC再投加100mg/L CPAM,搅拌静置30min),再进行超声波调理(超声频率40kHz,声能密度0.8 W/mL,超声时间20s),调理结束后疏浚底泥比阻值降至0.38×10~9 s~2/g,属于易脱水污泥,疏浚底泥脱水性能大大改善。疏浚底泥脱水性能与其微形态结构相关,疏浚底泥二维分形维数越大、中值粒径越大,其脱水与沉降性能越好。
Taking the sediment of Guitang River dredged from Changsha City as the research object,the single polymerized aluminum chloride(PAC),cationic polyacrylamide(CPAM),ultrasonic and their combination were used to improve the dewatering performance of the dredged sediment.The results showed that both single PAC and CPAM could improve the dewatering performance of dredged sediment to a certain degree,and the CPAM effect was better than that of PAC.The dewatering performance of dredged sediment was further improved by the combination of two chemical agents,and the dredged sediment belonged to easier to dewatered sludge after combination conditioning.Applying combination conditioning of ultrasonic with chemical conditioning to treat dredged sludge,the chemical conditioning(adding 3 g/L PAC first and then adding 100 mg/L CPAM and stirring for 30 min)should be adopted before ultrasonic treatment(ultrasonic frequency 40 kHz,acoustic energy density 0.8 W/mL,ultrasonic time 20 s).The specific resistance of dredged sediment dropped to 0.38×10~9 s~2/g after conditioning,the dewatering performance was greatly improved.The dewatering performance of dredged sediment was related to its micromorphological structure.The specific resistance and sedimentation performance of dredged sediment increased with the increase of fractal dimension and median diameter.
Taking the sediment of Guitang River dredged from Changsha City as the research object,the single polymerized aluminum chloride(PAC),cationic polyacrylamide(CPAM),ultrasonic and their combination were used to improve the dewatering performance of the dredged sediment.The results showed that both single PAC and CPAM could improve the dewatering performance of dredged sediment to a certain degree,and the CPAM effect was better than that of PAC.The dewatering performance of dredged sediment was further improved by the combination of two chemical agents,and the dredged sediment belonged to easier to dewatered sludge after combination conditioning.Applying combination conditioning of ultrasonic with chemical conditioning to treat dredged sludge,the chemical conditioning(adding 3 g/L PAC first and then adding 100 mg/L CPAM and stirring for 30 min)should be adopted before ultrasonic treatment(ultrasonic frequency 40 kHz,acoustic energy density 0.8 W/mL,ultrasonic time 20 s).The specific resistance of dredged sediment dropped to 0.38×10~9 s~2/g after conditioning,the dewatering performance was greatly improved.The dewatering performance of dredged sediment was related to its micromorphological structure.The specific resistance and sedimentation performance of dredged sediment increased with the increase of fractal dimension and median diameter.
引文
[1]贾丽昭,马文林.河湖底泥环保疏浚方法与应用[C]//中国环境科学学会.2008中国环境科学学会学术年会优秀论文集(上卷).北京:中国环境科学出版社,2008.
[2]于荣丽,孙铁珩,孙丽娜,等.微生物絮凝剂用于河道疏浚底泥快速脱水的研究[J].环境污染与防治,2012,34(5):35-38.
[3]颜昌宙,范成新,杨建华,等.湖泊底泥环保疏浚技术研究展望[J].环境污染与防治,2004,26(3):189-192.
[4]段云平,石泽敏.絮凝调理对河道疏浚底泥的脱水性能研究[J].安徽农业科学,2014,42(22):7577-7578.
[5]吕斌,杨开,洪汉清.东湖底泥的脱水性能试验研究[J].中国给水排水,2003,19(5):56-58.
[6]LEE C H,LIU J C.Enhanced sludge dewatering by dual polyelectrolytes conditioning[J].Water Research,2000,34(18):4430-4436.
[7]严媛媛,冯雷雨,张超杰,等.超声能量密度对污泥脱水性能的影响[J].化工学报,2010,61(2):491-495.
[8]牛美青,张伟军,王东升,等.不同混凝剂对污泥脱水性能的影响研究[J].环境科学学报,2012,32(9):2126-2133.
[9]URBAIN V,BLOCK J C,MANEM J.Bioflocculation in activated sludge:an analytic approach[J].Water Research,1993,27(5):829-838.
[10]LI Y Y,CAO C Y,LI B.Influence of ultrasonic treatment in chemical conditioning of excess sludge[J].Ecology and Environment,2012,21(7):1357-1360.
[11]李定龙,张志祥,申晶晶,等.超声波联合无机混凝剂对污泥脱水性能的影响[J].环境科学与技术,2011,34(7):20-22.
[12]韩萍芳,殷绚,吕效平.超声波处理石化厂剩余活性污泥[J].化工环保,2003,23(3):133-137.
[13]ZHAO Y Q.Correlations between floc physical correlations between floc physical properties and optimum polymer dosage in alum sludge conditioning and dewatering[J].Chemical Engineering Journal,2003,92(1/2/3):227-235.
[14]李玉瑛,何文龙,邓斌,等.超声波联合高分子絮凝剂对污泥的调理研究[J].工业水处理,2015,35(2):57-60.
[15]李常芳.超声波、氯化铁联合PAM对改善污泥脱水性能的研究[D].青岛:青岛理工大学,2014.
[16]MIKKELSEN L H,KEIDING K.Physico-chemical characteristics of full scale sewage sludges with implications to dewatering[J].Water Research,2002,36(10):2451-2462.
[17]穆丹琳,徐慧,肖峰,等.污泥调理对给水污泥脱水性能的影响[J].环境工程学报,2016,10(10):5447-5452.
[18]PRASERTSAN P,DERMLIM W,DOELLE H,et al.Screening,characterization and flocculating property of carbohydrate polymer from newly isolated Enterobacter cloacae,WD7[J].Carbohydrate Polymers,2006,66(3):289-297.
[19]ZHANG Z Q,XIA S Q,ZHANG J.Enhanced dewatering of waste sludge with microbial flocculant TJ-F1as a novel conditioner[J].Water Research,2010,44(10):3087-3092.
[20]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.
[21]邱高顺.超声波法调理污泥脱水效果研究[J].化学工程与装备,2015(3):231-233.
[22]吴玲.改善城市污水厂污泥脱水性能的实验研究[D].长沙:湖南大学,2012.
[2]于荣丽,孙铁珩,孙丽娜,等.微生物絮凝剂用于河道疏浚底泥快速脱水的研究[J].环境污染与防治,2012,34(5):35-38.
[3]颜昌宙,范成新,杨建华,等.湖泊底泥环保疏浚技术研究展望[J].环境污染与防治,2004,26(3):189-192.
[4]段云平,石泽敏.絮凝调理对河道疏浚底泥的脱水性能研究[J].安徽农业科学,2014,42(22):7577-7578.
[5]吕斌,杨开,洪汉清.东湖底泥的脱水性能试验研究[J].中国给水排水,2003,19(5):56-58.
[6]LEE C H,LIU J C.Enhanced sludge dewatering by dual polyelectrolytes conditioning[J].Water Research,2000,34(18):4430-4436.
[7]严媛媛,冯雷雨,张超杰,等.超声能量密度对污泥脱水性能的影响[J].化工学报,2010,61(2):491-495.
[8]牛美青,张伟军,王东升,等.不同混凝剂对污泥脱水性能的影响研究[J].环境科学学报,2012,32(9):2126-2133.
[9]URBAIN V,BLOCK J C,MANEM J.Bioflocculation in activated sludge:an analytic approach[J].Water Research,1993,27(5):829-838.
[10]LI Y Y,CAO C Y,LI B.Influence of ultrasonic treatment in chemical conditioning of excess sludge[J].Ecology and Environment,2012,21(7):1357-1360.
[11]李定龙,张志祥,申晶晶,等.超声波联合无机混凝剂对污泥脱水性能的影响[J].环境科学与技术,2011,34(7):20-22.
[12]韩萍芳,殷绚,吕效平.超声波处理石化厂剩余活性污泥[J].化工环保,2003,23(3):133-137.
[13]ZHAO Y Q.Correlations between floc physical correlations between floc physical properties and optimum polymer dosage in alum sludge conditioning and dewatering[J].Chemical Engineering Journal,2003,92(1/2/3):227-235.
[14]李玉瑛,何文龙,邓斌,等.超声波联合高分子絮凝剂对污泥的调理研究[J].工业水处理,2015,35(2):57-60.
[15]李常芳.超声波、氯化铁联合PAM对改善污泥脱水性能的研究[D].青岛:青岛理工大学,2014.
[16]MIKKELSEN L H,KEIDING K.Physico-chemical characteristics of full scale sewage sludges with implications to dewatering[J].Water Research,2002,36(10):2451-2462.
[17]穆丹琳,徐慧,肖峰,等.污泥调理对给水污泥脱水性能的影响[J].环境工程学报,2016,10(10):5447-5452.
[18]PRASERTSAN P,DERMLIM W,DOELLE H,et al.Screening,characterization and flocculating property of carbohydrate polymer from newly isolated Enterobacter cloacae,WD7[J].Carbohydrate Polymers,2006,66(3):289-297.
[19]ZHANG Z Q,XIA S Q,ZHANG J.Enhanced dewatering of waste sludge with microbial flocculant TJ-F1as a novel conditioner[J].Water Research,2010,44(10):3087-3092.
[20]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.
[21]邱高顺.超声波法调理污泥脱水效果研究[J].化学工程与装备,2015(3):231-233.
[22]吴玲.改善城市污水厂污泥脱水性能的实验研究[D].长沙:湖南大学,2012.