不同曝气量下超声波对污泥沉降性能的影响
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摘要
研究了在曝气量分别为3.0、2.5、2.0、1.5 L/min条件下超声波辐照对污泥性能的变化规律。在较高曝气量条件(3.0、2.5 L/min)下,超声组(声功率密度50 W/L)的污泥容积指数(SVI)略高于对照组(对照组、超声组SVI分别维持在250、300 m L/g),出水NH_4~+-N的质量浓度均维持在10 mg/L左右,COD的去除率均维持在90%以上。较低曝气量(2.0、1.5 L/min)条件下,超声组(声功率密度100 W/L)的污泥SVI保持在150 m L/g左右,而对照组SVI最高达到700 m L/g。对照组蛋白质和多糖含量分别为5.9、9.26 mg/(L·g),明显高于超声组的0.6、6.41 mg/(L·g)),对照组出水NH_4~+-N的质量浓度由20 mg/L持续上升到60 mg/L。因此,适宜强度的超声波辐照改善了污泥的沉降性能。
The effect of ultrasonic irradiation on sludge sedimentation performance was investigated under the conditions of aeration rate was 3.0, 2.5, 2.0 and 1.5 L/min. Under high aeration rate environment(3.0 L/min, 2.5 L/min), The SVI of the ultrasonic irradiation group(power density of sound was 50W/L) was slightly higher than that of the control group(the SVI of the control group and ultrasonic irradiation group were maintained at about 300 mL/g,250 mL/g, respectively), and the mass concentration of NH_4~+-N were maintained at about 10 mg/L, the COD removal rate were maintained above 90%.Under the low aeration rate environment(2.0 L/min, 1.5 L/min), the SVI of the ultrasonic group(power density of sound was 100 W/L) was maintained at about 150 mL/g, while the SVI of the control group was up to 700 mL/g. The protein and polysaccharide content of the control group were 5.9 and 9.26mg/(L·g), respectively, which was significantly higher than that of the ultrasonic irradiation group(0.6 and 6.41 mg/(L·g), respectively), while the effluent mass concentration of NH_4~+-N increased from 20 mg/L to 60 mg/L. Therefore, ultrasonic irradiation can improve the sludge sedimentation performance.
The effect of ultrasonic irradiation on sludge sedimentation performance was investigated under the conditions of aeration rate was 3.0, 2.5, 2.0 and 1.5 L/min. Under high aeration rate environment(3.0 L/min, 2.5 L/min), The SVI of the ultrasonic irradiation group(power density of sound was 50W/L) was slightly higher than that of the control group(the SVI of the control group and ultrasonic irradiation group were maintained at about 300 mL/g,250 mL/g, respectively), and the mass concentration of NH_4~+-N were maintained at about 10 mg/L, the COD removal rate were maintained above 90%.Under the low aeration rate environment(2.0 L/min, 1.5 L/min), the SVI of the ultrasonic group(power density of sound was 100 W/L) was maintained at about 150 mL/g, while the SVI of the control group was up to 700 mL/g. The protein and polysaccharide content of the control group were 5.9 and 9.26mg/(L·g), respectively, which was significantly higher than that of the ultrasonic irradiation group(0.6 and 6.41 mg/(L·g), respectively), while the effluent mass concentration of NH_4~+-N increased from 20 mg/L to 60 mg/L. Therefore, ultrasonic irradiation can improve the sludge sedimentation performance.
引文
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[2]ZHANG T,WANG B,LI X,et al.Achieving partial nitrification in a continuous post-denitrification reactor treating low C/N sewage[J].Chemical Engineering Journal,2018,335:330-337.
[3]WANG G,XU X,ZHOU L,WANG C,et al.A pilot-scale study on the start-up of partial nitrification-anammox process for anaerobic sludge digester liquor treatment[J].Bioresource Technology,2017,241:181-189.
[4]JENNI S,VLAEMINCK S E,MORGENRITH E,et al.Successful application of nitritation/anammox to wastewater with elevated organic carbon to ammonia ratios[J].Water Research,2014,49(2):316-326.
[5]SHALINI S S,JOSEPH K.Combined SHARON and ANAMMOXprocesses for ammoniacal nitrogen stabilisation in landfill bioreactors[J].Bioresource Technology,2018,250:723-732.
[6]WEI D,ZHANG K,NGO H H,et al.Nitrogen removal via nitrite in a partial nitrification sequencing batch biofilm reactor treating high strength ammonia wastewater and its greenhouse gas emission[J].Bioresource Technology,2017,230:49-55.
[7]WANG Q,YE L,JIANG G,et al.Side-stream sludge treatment using free nitrous acid selectively eliminates nitrite oxidizing bacteria and achieves the nitrite pathway[J].Water Research,2014,55(10):245-255.
[8]SHE Z,ZHAO L,ZHANG X,et al.Partial nitrification and denitrification in a sequencing batch reactor treating high-salinity wastewater[J].Chemical Engineering Journal,2016,288:207-215.
[9]MIAO Y,ZHANG L,LI B,et al.Enhancing ammonium oxidizing bacteria activity was key to single-stage partial nitrification-anammox system treating low-strength sewage under intermittent aeration condition[J].Bioresource Technology,2017,231:36-44.
[10]GE S J,WANG S,YANG X,et al.Detection of nitrifiers and evaluation of partial nitrification for wastewater treatment:A review[J].Chemosphere,2015,140(9):85-98.
[11]GE S,PENG Y Z,QIU S,et al.Complete nitrogen removal from municipal wastewater via partial nitrification by appropriately alternating anoxic/aerobic conditions in a continuous plug-flow step feed process[J].Water Research,2014,55(2):95-105.
[12]刘宏,彭永臻,卢炯元,等.温度对间歇曝气SBR短程硝化及硝化活性的影响[J].环境科学,2017(11):4656-4663.
[13]吴军,张悦,徐婷,等.AOB溶解氧亲和力低于NOB条件下序批反应器中NOB淘汰的实现机制[J].中国环境科学,2016,36(12):3583-3590.
[14]BAO P,WANG S,MA B,et al.Achieving partial nitrification by inhibiting the activity of Nitrospira-like bacteria under high-DOconditions in an intermittent aeration reactor[J].Journal of Environmental Sciences,2017,56(6):71-78.
[15]ZHU Y C,LI X,DU M A,et al.Improve bio-activity of anaerobic sludge by low energy ultrasound[J].Water Science&Technology,2015,72(12):2221-2228.
[16]GHAFARZADEH M,ABEDINI R,RAJABI R.Optimization of ultrasonic waves application in municipal wastewater sludge treatment using Response surface method[J].Journal of Cleaner Production,2017,150:361-370.
[17]CHU C P,CHANG B,LIAO G S,et al.Observations on change in ultrasonically treated waste activated sludge[J].Water Research,2001,35(4):1038-1046.
[18]ZHENG M,LIU Y C,XU K N,et al.Use of low frequency and density ultrasound to stimulate partial nitrification and simultaneous nitrification and denitrification[J].Bioresource Technology,2013,146:537-542.
[19]ZHENG M,LIU Y C,JIA X,et al.Ultrasonic treatment enhanced ammonia-oxidizing bacterial(AOB)activity for nitritation process[J].Environmental Science&Technology,2015,50(2):864-871.
[20]国家环境保护总局《水和废水监测分析方法》编委会.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002.
[21]OTHMAN I,ANUAR A N,UJANG Z,et al.Livestock wastewater treatment using aerobic granular sludge[J].Bioresource Technology,2013,133(2):630-634.
[22]王梦杰,员建,马华继,等.低强度超声波对膨胀活性污泥沉降性能及污泥减量的影响[J].化工进展,2017,36(3):1134-1139.
[23]LIU X M,SHENG G P,LUO H W,et al.Contribution of extracellular polymeric substances(EPS)to the sludge aggregation.[J].Environmental Science&Technology,2010,44(11):4355-4360.
[24]DAI Q X,MA L P,REN N Q,et al.Investigation on extracellular polymeric substances,sludge flocs morphology,bound water release and dewatering performance of sewage sludge under pretreatment with modified phosphogypsum[J].Water Research,2018,142:337-346.