超声波协同混凝剂投加技术处理生活污水
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摘要
利用超声的空化效应、超声机械振动效应及自由基效应,以增大污水中有机物的比表面积、加快热运动,使有机组分与混凝剂充分碰撞,从而提高共沉淀速率,实现超声波协同药剂投加技术处理生活污水.本文探讨了超声波处理时间、污水pH、混凝剂种类及投加量对污水处理效果的影响.实验表明:采用超声波协同混凝剂投加处理生活污水,在超声波处理时间为800s、聚合氯化铝投加量为0.4g/L、污水pH为7.0的条件下,先用超声波处理后投加聚合氯化铝对COD、NH+4-N的处理效果最佳,去除率分别为72.46%、59.95%,在最佳实验条件下,本法对总磷和悬浮物也有一定的去除效果.
In this study,the ultrasound-coagulant synergy method was used in improving the synergetic treatment efficiency of organic pollutants in wastewater.With the cavitation effect,mechanical vibration effect and free radical effect of ultrasound,the specific surface area of organic matters in sewage was increased,the thermal movement was speed up,and the unit and the coagulant were fully collided to improve the co precipitation rate.The effects of ultrasonic time,sewage pH,coagulant type and dosage on the treatment efficiency of sewage COD and NH+4-N were discussed.The results show that,the ultrasonic treatment time is 800 s,the dosage of polyaluminium chloride is 0.4 g/L,sewage pH is 7.0,and ultrasonic is used after the treatment of polyaluminium chloride,the ultrasound-coagulant synergy method achieve the best treatment effect,the removal efficiency of COD and NH+4-N are 72.46% and 59.95%,respectively.Under the optimum conditions,this method also has effect on total phosphorus and suspended solids.
In this study,the ultrasound-coagulant synergy method was used in improving the synergetic treatment efficiency of organic pollutants in wastewater.With the cavitation effect,mechanical vibration effect and free radical effect of ultrasound,the specific surface area of organic matters in sewage was increased,the thermal movement was speed up,and the unit and the coagulant were fully collided to improve the co precipitation rate.The effects of ultrasonic time,sewage pH,coagulant type and dosage on the treatment efficiency of sewage COD and NH+4-N were discussed.The results show that,the ultrasonic treatment time is 800 s,the dosage of polyaluminium chloride is 0.4 g/L,sewage pH is 7.0,and ultrasonic is used after the treatment of polyaluminium chloride,the ultrasound-coagulant synergy method achieve the best treatment effect,the removal efficiency of COD and NH+4-N are 72.46% and 59.95%,respectively.Under the optimum conditions,this method also has effect on total phosphorus and suspended solids.
引文
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[2]Ambashta R D,Sillanpaa M.Water purification using magnetic assistance:A review[J].Journal of Hazardous Materials,2010,180:38-49.
[3]Naddeo V,Borea L,Belgiomo V.Sonochemical control of fouling formation in membrane ultrafiltration of wastewater:Effect of ultrasonic frequency[J].Journal of Water Process Engineering,2015,8(3):92-97.
[4]Mischopoulou M,Naidis P,Kalamaras S,et al.Effect of ultrasonic and ozonation pretreatment on methane production potential of raw molasses wastewater[J].Renewable Energy,2016,96(B):1 078-1 085.
[5]Mahdi G,Rezvan A,Rohollah R.Optimization of ultrasonic waves application in municipal wastewater sludge treatment using response surface method[J].Journal of Cleaner Production,2017,150:361-370.
[6]Bagal M V,Gogate P R.Wastewater treatment using hybrid treatment schemes based on cavitation and fenton chemistry:A review[J].Ultrasonics Sono-chemistry,2014,21(1):1-14.
[7]董殿波.超声降解染料废水研究进展[J].染料与染色,2016,53(5):57-61.
[8]张格红,赵平歌,廖志鹏,等.超声强化铋掺杂氧化铟降解偶氮染料废水[J].环境化学,2016,35(3):526-532.
[9]聂国庆,吴耀国,李想,等.超声技术在水处理中主要影响因素的研究进展[J].水处理技术,2008,34(3):11-14,87.
[10]Hou S X,Luo J J,He B,et al.The treatment of radioactive wastewater by ultrasonic standing wave method[J].Journal of Hazardous Materials,2014,274:41-45.
[11]余丽胜,李晓霞,焦纬洲,等.超声协同Fenton法处理有机废水的研究进展[J].化工环保,2017,37(1):38-42.
[12]姚吉伦,周振庞,治邦,等.超声波耦合工艺在水处理中的研究进展[J].当代化工,2016,45(11):2 660-2 665.
[13]刘香兰,刘桂兰,肖广全.超声波联合混凝法处理制药废水的研究[J].中国农学通报,2012,28(29):190-194.
[14]冯俊生,许晓锋,赵丽华.纳米复合脱氮剂/气动超声吹脱高浓度氨氮废水[J].环境工程学报,2015,9(1):177-182.
[15]Sekiguchi K,Kudo T,Sankoda K.Combined sonochemical and short-wavelength UV degradation of hydrophobic perfluorinated compounds[J].Ultrasonics Sonochemistry,2017,39:87-92.
[16]冯颜颜,黄廷林,李诚.不同混凝剂水处理效果及其对超滤膜影响的试验研究[J].水处理技术,2013,39(1):118-121.
[17]陈灿,曾祥专,卢欢亮.混凝捕捉协同处理酸性含铊废水试验研究[J].给水排水,2016,42(7):67-70.