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Effects of ultrasound on the released amount of nitrogen and phosphorus and changes of water quality during blooms control |
TAN Xiao1, GU Hui-hui1, DUAN Zhi-peng1, LI Nie-gui2, JI Yan-ling1 |
1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China;
2. Nanjing Automation Institute of Water Conservancy and Hydrology, Nanjing 210012, China |
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Abstract Ultrasonic technology for controlling cyanobacterial blooms has attracted much attention from the general public. In order to investigate the effects of ultrasonic treatment on water quality deterioration and the amount of nitrogen and phosphorus released from sediments or algal cells. In this study, samples were collected from Meiliang Bay of Taihu Lake, and then, three experimental groups were designed:mixture of sediment and water (sediment system), suspension solution of Microcystis (algae system), and combination of sediment and algae suspension (sediment + algae system), so as to evaluate effects of low-frequency ultrasound (35kHz, 0.035W/mL). Results showed that marked release of nitrogen and phosphorus from sediments seldom occurred within 20min, while prolonged treatment (over 40min) would lead to largely nutrients release and algal cells rupture. Based on the data comparison among three experimental groups, the contribution of nitrogen and phosphorus released from sediments was much greater than that from algal cells. To a certain extent, CODMn and TN could be reduced by ultrasonic treatment. In sediment system and sediment + algae system, dissolved nitrogen mainly existed as ammonia and nitrate forms after treatment. For the sake of water quality safety, the intensity and duration of ultrasonic treatment should be optimized, which means low-intensity and short-time treatment is suggested, so as to avoid nutrients largely released from sediments and algal cells rupture.
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Received: 17 September 2017
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[1] |
Ahn C Y, Park M H, Joung S H, et al. Growth inhibition of cyanobacteria by ultrasonic radiation:laboratory and enclosure studies[J]. Environmental Science & Technology, 2003,37(13):3031-3037.
|
[2] |
Rajasekhar P, Fan L, Nguyen T, et al. A review of the use of sonication to control cyanobacterial blooms[J]. Water Research, 2012,46(14):4319-4329.
|
[3] |
Rodriguez-Molares A, Dickson S, Hobson P, et al. Quantification of the ultrasound induced sedimentation of Microcystis aeruginosa[J]. Ultrasonics Sonochemistry, 2014,21(4):1299-1304.
|
[4] |
Rajasekhar P, Fan L, Nguyen T, et al. Impact of sonication at 20kHz on Microcystis aeruginosa, Anabaena circinalis, and Chlorella sp.[J]. Water Research, 2012,46(5):1473-1481.
|
[5] |
Purcell D, Parsons S A, Jefferson B. The influence of ultrasound frequency and power, on the algal species Microcystis aeruginosa, Aphanizomenon flos -aquae, Scenedesmus subspicatus and Melosira sp.[J]. Environmental Technology, 2013,34(17):2477-2490.
|
[6] |
Qiu Y J, Rong F, Yang F, et al. Ultrasound frequency impacts on the removal of indigenous blue-green algae taken from Lake Taihu[J]. Advanced Materials Research, 2011,383-390(20):3758-3762.
|
[7] |
万莉,邵路路,陆开宏,等.超声波对铜绿微囊藻超微结构和生理特性的影响[J]. 水生生物学报, 2014,38(3):516-524.
|
[8] |
Lee T J, Nakano K, Matsumara M. Ultrasonic irradiation for blue-green algae bloom control[J]. Environmental Technology, 2001,22(4):383-390.
|
[9] |
Wu X, Joyce E M, Mason T J. The effects of ultrasound on cyanobacteria[J]. Harmful Algae, 2011,10(6):738-743.
|
[10] |
万欣.超声波技术应用于针杆藻暴发的应急处理试验研究[D]. 重庆:重庆大学, 2013.
|
[11] |
Cameron M, Mcmaster L D, Britz T J. Electron microscopic analysis of dairy microbes inactivated by ultrasound[J]. Ultrasonics Sonochemistry, 2008,15(6):960-964.
|
[12] |
D'Auzay S L, Blais J F, Naffrechoux E. Comparison of characterization methods in high frequency sonochemical reactors of differing configurations[J]. Ultrasonics Sonochemistry, 2010, 17(3):547-554.
|
[13] |
Wu X, Joyce E M, Mason T J. Evaluation of the mechanisms of the effect of ultrasound on Microcystis aeruginosa, at different ultrasonic frequencies[J]. Water Research, 2012,46(9):2851-2858.
|
[14] |
Zhang G, Zhang P, Fan M. Ultrasound-enhanced coagulation for Microcystis aeruginosa removal[J]. Ultrasonics Sonochemistry, 2009,16(3):334-338.
|
[15] |
朱健,李捍东,王平.环境因子对底泥释放COD、TN和TP的影响研究[J]. 水处理技术, 2009,35(8):44-49.
|
[16] |
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(第四版)[M]. 北京:中国环境科学出版社, 2002:670-671.
|
[17] |
朱广伟,秦伯强,张路,等.太湖底泥悬浮中营养盐释放的波浪水槽试验[J]. 湖泊科学, 2005,17(1):61-68.
|
[18] |
张彬,李涛,刘会娟,等.模拟扰动条件下太湖水体悬浮物的结构特性[J]. 环境科学, 2007,28(1):70-74.
|
[19] |
Li J, Long H, Song C, et al. Study on the removal of algae from lake water and its attendant water quality changes using ultrasound[J]. Desalination & Water Treatment, 2014,52(25-27):4762-4771.
|
[20] |
Li J, Qiu Y, Long H, et al. A study of the changes of water quality before and after utilizing low frequency and low power ultrasound treat algae[C]. Nanjing:International Conference on Remote Sensing, Environment and Transportation Engineering, 2011:7327-7330.
|
[21] |
朱浩,刘兴国,吴宗凡,等.底泥扰动对池塘上覆水体水质的影响[J]. 江苏农业科学, 2014,42(5):313-315.
|
[22] |
徐敏,程凯,孟博,等.环境因子对衣藻水华消长影响的初步研究[J]. 华中师范大学学报(自然科学版), 2001,35(3):322-325.
|
[23] |
谭啸,孙玉童,段志鹏,等.不同超声强度下微囊藻群体沉降及其上浮过程对光照和温度的响应[J]. 湖泊科学, 2017,29(5):1168-1176.
|
[24] |
Liu C, Wang J, Cao Z, et al. Variation of dissolved organic nitrogen concentration during the ultrasonic pretreatment to Microcystis aeruginosa[J]. Ultrasonics Sonochemistry, 2016,29:236-243.
|
[25] |
Liu C, Cao Z, Wang J, et al. Performance and mechanism of phycocyanin removal from water by low-frequency ultrasound treatment[J]. Ultrasonics Sonochemistry, 2017,34:214-221.
|
[26] |
孙小静,秦伯强,朱广伟.蓝藻死亡分解过程中胶体态磷、氮、有机碳的释放[J]. 中国环境科学, 2007,27(3):341-345.
|
[27] |
朱宸,丁凯耘,丛海兵,等.水质安全的动态超声波强化混凝控藻水处理试验研究[J]. 环境科学学报, 2015,35(8):2429-2434.
|
[28] |
赵荔.超声波降解净水沉淀污泥中有机物试验研究[D]. 北京工业大学, 2014.
|
[29] |
王峰,闻人勤.水的浊度和悬浮物[J]. 华东电力, 1996,24(4):27-28.
|
[30] |
金同轨,陈保平,梁春华,等.黄河水浊度与含沙量、泥沙粒度之间的关系[J]. 中国给水排水, 1989,5(1):10-13.
|
[31] |
Henglein A, Kormann C. Scavenging of ?OH radicals produced in the sonolysis of water[J]. International Journal of Radiation Biology, 1985,48(2):251-258.
|
|
|
|