Education background

Ph.D. in Civil Engineering, July 2005, Tsinghua University, Beijing, China

M.S. in Environmental Engineering, March 2002, Shandong University, Jinan, China

B.S. in Environmental Engineering, July 1999, Shandong University, Jinan, China

Experience

2010-present     Associate Professor, School of Environment, Tsinghua University, China
2019.2-6           Visiting Professor, Venice International University, Italy
2017-2018    Director of Research Center for Environmental Risk & Emergency, Research Institute for Environmental Innovation (Suzhou), Tsinghua
2017-present PI for emergency drinking water treatment group, Research Institute for Environmental Innovation (Suzhou), Tsinghua
2012-2013       Visiting Scholar, Department of Environmental Health Sciences, School of Public Health, University of California at Los Angeles, CA, USA
2007-2010 Faculty, Department of Environmental Science and Engineering, Tsinghua University
2005-2007 Postdoctoral Associate, Department of Environmental Science and Engineering, Tsinghua University

Concurrent Academic

Member, International Water Association (IWA), since 2004

Strategic Council member, IWA, since 2015

Secretary, Specialist Group of Disinfection, IWA, since 2015

Management Committee member, Specialist Group of Disinfection, IWA, 2005-2015

Management Committee member, Specialist Group of Off-flavor, IWA, since 2011

Young Water Professional committee member, IWA, 2006 - 2008

Young Water Professional committee advisor, IWA, 2008 – 2010

Member, American Chemistry Society (ACS), since 2011

Member, American Water Works Association (AWWA), since 2014

Council Member of Chinese Young Water Professional committee, since 2012

Board Member of Chinese Research Association of Drinking Water Advanced Treatment, since 2013

Senior Member of Chinese Society for Environmental Sciences, since 2014

Member of Chinese Society for Microbiology, since 2005

Responsible Editor, Frontier of Environmental Science and Engineering, 2010-2013

Editorial board, China Environmental Information Journal, since 2008

Social service

Member, International Water Association (IWA), since 2004
Strategic Council member, IWA, since 2015
Secretary, Specialist Group of Disinfection, IWA, 2015-2018
Chairman, Specialist Group of Disinfection, IWA, since 2018
Management Committee member, Specialist Group of Disinfection, IWA, 2005-2015
Management Committee member, Specialist Group of Off-flavor, IWA, since 2011
Young Water Professional committee member, IWA, 2006 - 2008
Young Water Professional committee advisor, IWA, 2008 – 2010
Member, American Chemistry Society (ACS), since 2011
Member, American Water Works Association (AWWA), since 2014
Council Member of Chinese Young Water Professional committee, since 2012
Board Member of Chinese Research Association of Drinking Water Advanced Treatment, since 2013
Senior Member of Chinese Society for Environmental Sciences, since 2014
Member of Chinese Society for Microbiology, since 2005
Responsible Editor, Frontier of Environmental Science and Engineering, 2010-2013

Areas of Research Interests/ Research Projects

1. Disinfection, disinfection by-products and precursor
2. Technology and management for emergency water treatment
3. Water quality problem and control in drinking water distribution system

Research Status

The water supply in China is still facing some severe challenges. Among these challenges, the high concentration of disinfection by-products (DBPs) in tap water and the frequent chemical spill accidents in source water are quite prominent. Dr Chen focuses his work on the chemical risk control of drinking water quality, especially on DBP control, the emergency response to echo the national demands for safe water and the frontier of international academia.
During the past two decades, the following accomplishments have been obtained:

(1) Development of DBP precursor analysis and control technology for emerging disinfection by-products, especially on nitrosamines.
The major precursors of DBPs in China, including trihalomethanes (THMs), haloacetic acids (HAAs) (Sci. Tot. Environ., 2008), and nitrosamines (Water Res., 2015), have been identified. It was found that there is fairly high risk of nitrosamines, one emerging DBPs in the drinking water in China (Water Res., 2016), which has attracted much attention in China. The nitrosamine precursor analysis based on the Polar Rapid Analysis Method (PRAM) was developed (Water Res., 2014), which revealed the basic structure of nitrosamine precursors of both positively charge and non-polarity. This method is expected to become a universal research tool. Based on the results of precursor analysis, it was determined that ozone-granular or biological activated carbon is the best available technology at the present stage, which can simultaneously control THMs, HAAs and nitrosamines (Sci. Tot. Environ., 2007, 2013; J. AWWA, 2014; 2015; 2017). Based on PRAM tool, the mechanism of DBP precursor removal by different processes was revealed (Water Res., 2015). The process and mechanism of nitrosamine precursors by biodegradation was also investigated (Chemosphere, 2015). The sequential chlorination process was developed to achieve the simultaneous control of microorganism as well as DBPs such as THMs, HAAs and nitrosamines (Biomed. & Environ. Sci., 2006, 2007; J. AWWA, 2017; Sep. & Purif. Tech., 2018). The nitrosamine precursor treatment and concentration tool for analysis based on cation exchange technology were first developed (J. Env. Sci., 2017). The black and odorous water was found to be an important source of nitrosamine precursors (Chemosphere, 2016). These achievements are very helpful to address the concern of DBPs (Accounts Chem. Res., 2019).
(2) Established the emergency water treatment technologies to address the chemical spill accidents in water source.
Dr Chen established a comprehensive technologies for urban water supply emergency treatment with the cooperation with Professor Xiaojian Zhang. Six key technologies including activated carbon adsorption, chemical precipitation, oxidation/reduction, enhanced disinfection, aeration stripping and algae treatment were developed which can cover almost all regulated drinking water contaminants (Environ. Sci. & Technol., 2011; Accounts Chem. Res., 2019). They obtained the adsorption characteristics of activated carbon (AC) for over sixty organic pollutants; developed the chemical precipitation technology to deal with heavy metals; developed the aeration stripping technology for the volatile pollutants; set up the models to predict the removal of organic matter by AC adsorption and aeration stripping performance of (SAR & QSAR in Environ. Res. 2015; J. Environ. Sci., 2016). They also developed some key equipment such as the pilot water treatment plant and the mobile emergency reagent addition system. The release mechanism of thiol sulfide odorous substances in the process of algae death was studied, which provided important clues for determining cause of the water crisis in Taihu Lake (J. Hat. Mat., 2010). Major breakthrough was obtained in the comprehensiveness of emergency treatment technology, the coverage of contaminants, the rapid and high-efficient application and stability of process implementation. Dr Chen has devoted himself in the emergency response work in several important accidents, including the Songhua River nitrobenzene pollution in 2005, the Wuxi Taihu Water Crisis in 2007, the 2008 Wenchuan Earthquake, the 2012 Longjiang River cadmium pollution in 2014, the tap water with benzene cocnentration exceeded the standard’s in  Lanzhou in 2014, the Tianjin Port explosion accident in 2015, and the emergency response for water supply in Guangyuan in 2015, the Henan Nanyang Qihe pollution and other big incidents of emergency work. He has served as a member of expert team for the Ministry of Housing and Urban-Rural Construction or the Ministry of Environmental Protection for several times to help address the accidents.

Tsinghua University
1. Field trip of water treatment engineering (core course for undergraduates, since 2011)
2. Design of water treatment facility (core course for undergraduates, since 2011)
3. Introduction to environmental and earth sciences (core course for undergraduates, since 2017)
4. Advanced water treatment engineering (core course for postgraduates, since 2006)
5. Emergency response treatment and management for environmental accidents (selective course for graduates, since 2015)
Venice International University, Italy
1. Introduction to Environmental Engineering (Globalization Program S1929)
2. Environmental Risk and Emergency Response (Globalization Program S1930)

PROJECTS
1. Hypothesis verification on nitrosamine precursor formation from microorganism metabolism in aquatic environment. National Science Foundation Committee, China, 2018-2021. PI
2. Development and application of polarity rapid assessment method for nitrosamine precursor characterization. National Science Foundation Committee, China, 2015-2018. PI
3. Research on the short-term exposure of drinking contaminants due to chemical spill accidents  and the emergency response technologies, China National Grand Special Program for Water Pollution Control, 2015-2016. Co-PI
4. Emergency drinking water treatment technology and process: research and demonstration, China National Grand Special Program for Water Pollution Control, 2008-2012. PI
5. Drinking water treatment for high-algae-laden source water in Lake Taihu, Ministry of Science and Technology, China, 2008-2012. PI
6. Inactivation of Microorganism in complex niche in drinking water system, National Science Foundation Committee, China, 2008-2010. PI
7. Precursor of Emerging Disinfection By-products: Characterization and Control Technologies. Tsinghua University Initiative Scientific Research Program. 2014-2016. PI
8. Nitrosamine as the disinfection by-products in drinking water: precursor identification and treatment process, National Science Foundation Committee, China, 2010-2012. Co-PI
9. Emergency drinking water treatment technology, Ministry of House and Urban-rural Construction, China, 2006-2008. Co-PI
10. Controlling the formation of nitrosamines during water treatment. Water Research Foundation 4370. USA. 2012-2014. Investigator.
11. Drinking water source and water environment in Wenchuan Earthquake hit area: assessment and measures, Ministry of Environmental Protection, China, 2008-2009. Investigator
12. Drinking water treatment for micro-polluted source water: research and development of instrument, Ministry of Science and Technology, China, 2007-2009. Investigator
13. Drinking water stability in distribution system: research and development, Ministry of Science and Technology, China, 2007-2009. Investigator

Honors And Awards

2018, Award of National Science and Technology Advances (2nd Class), 6th investigator, issued by the Central Government of the People’s Republic of China
2015 Award of Environmental Science and Technology, China (1nd Class), 10th investigator, issued by Ministry of House and Urban-Rural Construction, China
2015 Award of Science and Technology Progress, Shandong province, China (2nd Class), 4th investigator, issued by Ministry of House and Urban-Rural Construction, China
2014 Award of Science and Technology Progress on Construction, China (3rd Class), 2nd investigator, issued by Ministry of House and Urban-Rural Construction, China
2010 Award of Young Scientist of China Environment Society
2009 Award of Science and Technology Progress on Construction, China (2nd Class), 3rd investigator, issued by Ministry of House and Urban-Rural Construction, China
2009 Honor of Excellent Postdoctoral in Tsinghua University (Top 10)
2008 Honor of National Labor Day Team, member, issued by All China Federation of Trade Unions
2008 Honor of Beijing’s Labor Day Team, member, issued by Beijing Federation of Trade Unions
2007 Award of Science and Technology Progress of Tianjin (2nd Class)
2002 Award of Science and Technology Progress of Shandong Province, China (1st Class), 6th investigator

Academic Achievement

BOOKS
1. Chao Chen, Arash Zamyadi, Tsair-Fuh Lin and Daniel Gallagher. Chapter 6. Removal of odourants from drinking water. In Tsair-Fuh Lin, Susan Watson, Andrea M. Dietrich,  I.H. (Mel) Suffet ed. Taste and Odour in Source and Drinking Water: Causes, Controls, and Consequences. IWA publishing. London, UK. 2019 (in English)
2. Xiaojian Zhang, Chao Chen. Chapter 9. Emergency treatment technologies. In Yanqiu Qie, Jinsong Zhang Ed. Design for Drinking Water Treatment Plants. 2017. China Architecture and Building Press, Beijing, 2017. (In Chinese)
3. Yue ZHANG, Xiaojian ZHANG, Chao CHEN, Hong DONG, Guidelines for emergency drinking water treatment (2nd Edition), China Architecture and Building Press, Beijing, 2017. (In Chinese)
4. CHEN Chao, ZHANG Xiaojian, Chapter 11 Treatment technologies and processes for contaminated source water. In LU Wenqing in chief. Water pollution and health. Wuhan, Hubei Science and Technology Press, Wuhan, 2017. (In Chinese)
5. Chao Chen*, David Hanigan, Xiaobin Liao, Jun Wang Xiaojian Zhang, I. H. (Mel) Suffet, Stuart W. Krasner, Paul Westerhoff. pH Effect on Nitrosamine Precursors Removal by Activated Carbon Adsorption. In Tanju Kranfil, Paul Westerhoff, William Mitch and Yuefeng Xie, eds. ACS DBP symposium book. 2015. (In English)
6. ZHANG Xiaojian, CHEN Chao, Chapter 2 Protection of aquatic environment and drinking water safety in the affected area. In Chen Jining in chief. Environmental safety assessment of Wenchuan Earthquake: methods and practices, China Environmental Sciences Press, Beijing, 2012. (In Chinese)
7. ZHANG Xiaojian, LIN Pengfei, CHEN Chao, et al. Arsenic emergency treatment and disposal. China Environmental Sciences Press, Beijing, 2010. (In Chinese)
8. Yue ZHANG, Xiaojian ZHANG, Chao CHEN, Huan WANG and Suxia ZHANG, Guidelines for emergency drinking water treatment, China Architecture and Building Press, Beijing, 2009. (In Chinese)
9. Xiaojian ZHANG, Chao CHEN, Chapter 9 Disinfection, In Wenjie HE, Weiguang LI, Xiaojian ZHANG, Tinglin HUANG and Hongda HAN, Technology for Safe Drinking Water, China Architecture and Building Press, Beijing, 2006. (In Chinese)

SELECTED PUBLICATIONS
1. Bei E., Wu X.M., Qiu Y., Chen C.*, Zhang X.J. A tale of two water supplies in China: finding practical solutions to urban and rural water supply problems. Accounts of Chemical Research. 2019. https://pubs.acs.org/doi/full/10.1021/acs.accounts.8b00605
2. Zhang H.Y., Tian Y.M., Kang M.X., Chen C., Song Y.R., Li. H. Effects of chlorination/chlorine dioxide disinfection on biofilm bacterial community and corrosion process in a reclaimed water distribution system. Chemosphere, 2019, 215, 62-73.
3. Li S.X., Shu Y.Y., Tang X., Lin P.F., Wang J., Zhang X.J., Chen C*. Reaction patterns of NDMA precursors during the sequential chlorination process of short-term free chlorination and monochloramination. Separation and Purification Technology. 2018, 204: 196–204.
4. Hao Fu, Xuebing Li, Jun Wang, Pengfei Lin, Chao Chen*, Xiaojian Zhang, I.H. (Mel) Suffet. Activated carbon adsorption of quinolone antibiotics in water: Performance, mechanism, and modeling. Journal of Environmental Sciences. 2017, 56: 145-152.
5. Li S.X., Zhang X.L., Bei E., Yue H.H., Lin P.F., Wang J., Zhang X.J., Chen C.*. Capability of cation exchange technology to remove proven N-nitrosodimethylamine precursors. Journal of Environmental Sciences. 2017. 58, 331-339. https://doi.org/10.1016/j.jes.2017.04.007
6. Liao X.B., Chen C.*, Yuan B.L.*, Wang J., Zhang X.J. Control of Nitrosamines, THMs, and HAAs in Heavily Impacted Water With O3-BAC. Journal of American Water Works Association. 2017, 109, 6: E3-13. https://doi.org/10.5942/jawwa.2017.109.0057
7. Yao WK, Qu QY, von Gunten U, Chen C, Yu G, Wang YJ. Comparison of methylisoborneol and geosmin abatement in surface water by conventional ozonation and an electro-peroxone process. Water Research. 2017, 108: 373-382.
8. Bei E., Shu Y.Y., Li S.X., Wang J., Zhang X.J., Chen C*., Krasner S.W. Occurrence of nitrosamines and their precursors in drinking water systems around mainland China. Water Research. 2016, 98: 168-175.
9. Han Ding, Xin Li, Jun Wang, Xiaojian Zhang, Chao Chen*. Adsorption of chlorophenols from aqueous solutions by pristine and surface functionalized single-walled carbon nanotubes. Journal of Environmental Sciences. 2016, 43: 187-198. Cover article.
10. Ding, H.; Chen, C.*; Zhang, X. Linear solvation energy relationship for the adsorption of synthetic organic compounds on single-walled carbon nanotubes in water. SAR and QSAR in Environmental Research. 2016, 27, 1: 31-45.
11. Xin Li, Pengfei Lin, Jun Wang, Yuanyuan Liu, Yong Li, Xiaojian Zhang & Chao Chen*. Treatment technologies and mechanisms for three odorants at trace level: IPMP, IBMP, and TCA. Environmental Technology. 2016, 37, 3: 308–315, http://dx.doi.org/10.1080/09593330.2015.1069405
12. Mi Zilong, Zhang Xiaojian, Chen Chao. Iron release in drinking water distribution systems by feeding desalinated seawater: characteristics and control. Desalination and Water Treatment. 2016, 57: 9728–9735. DOI: 10.1080/19443994.2015.1031706
13. Bei E., Liao X.B., Meng X.T., Li S.X., Wang J., Sheng D.Y., Chao M., Chen Z.H., Zhang X.J., Chen C.*. Identification of nitrosamine precursors from urban drainage during storm events: A case study in southern China. Chemosphere. 2016, 160, 323-331.
14. Han Ding, Xin Shen, Chao Chen*, Xiaojian Zhang. Molecular dynamics simulations of simple aromatic compounds adsorption on single-walled carbon nanotubes. RSC Advances, 2016, DOI: 10.1039/C6RA12644H
15. Liao, XB; Zou, RS; Chen, C; Yuan, BL; Zhou, ZM; Ma, HF; Zhang, XJ. Biomass development in GAC columns receiving influents with different levels of nutrients. Water Science and Technology-Water Supply. 2016. 16, 4: 1024-1032. DOI: 10.2166/ws.2016.016
16. Mi, Zilong; Dai, Yu; Xie, Shuguang, Chao Chen; Xiaojian Zhang. Impact of disinfection on drinking water biofilm bacterial community. Journal of Environmental Sciences. 2015, 37: 200-205.
17. Xin Li, Jun Wang, Yuanyuan Liu, Jian Shi, Xiaojian Zhang and Chao Chen. Odorant screening and possible origin analysis of odor episodes in one reservoir in northern China. Journal of Water Supply: Research and Technology—AQUA. 2015, 64, 7: 847-856.
18. Xin LI, Jun WANG, Xiaojian ZHANG, Chao CHEN, Yuefeng XIE, I. H. (Mel) SUFFET. Powdered activated carbon adsorption of two fishy odorants in water: trans,trans-2,4-heptadienal and trans,trans-2,4-decadienal. Journal of Environmental Sciences. 2015, 32, 15-25. DOI:10.1016/j.jes.2015.01.001.
19. Wang C.K., Liu S.M., Wang J., Zhang X.J., Chen C*. Monthly survey of N-nitrosamines yield in a conventional water treatment plant in North China. Journal of Environmental Sciences. 2015, 38: 142-149. DOI: http://dx.doi.org/10.1016/j.jes.2015.05.025.
20. Liao XB, Bei E, Li SX, Ouyang YY, Wang J, Chen C*, Zhang XJ, Krasner SW and Suffet M. Applying the polarity rapid assessment method to characterize nitrosamine precursors and to understand their removal by drinking water treatment processes. Water Research. 2015, 87: 292-298
21. Liao XB, Chen C*, Xie SG, David Hanigan, Wang J, Zhang XJ, Paul Westerhoff, Stuart W. Krasner. Nitrosamine Precursor Removal by BAC: Adsorption versus Biotreatment Case Study. Jour. AWWA. 2015, 107, 9: E454-463.
22. Liao XB#, Chen C#, Zhang JX, Dai Y, Zhang XJ, Xie SG. Operational performance, biomass and microbial community structure: impacts of backwashing on drinking water biofilter. Environ Sci Pollut Res. 2015, 22:546–554. DOI 10.1007/s11356-014-3393-7
23. Liao XB#, Chen C #, Zhang JX, Dai Y, Zhang XJ, Xie SG. Dimethylamine biodegradation by mixed culture enriched from drinking water biofilter. Chemosphere. 2015, 119: 935–940
24. Xiaobin Liao#, Chao Chen#, Zhao Wang, Chih-Hsiang Chang, Xiaojian Zhang, Shuguang Xie. Bacterial community change through drinking water treatment processes. International Journal of Environmental Science and Technology. 2015, DOI: 10.1007/s13762-014-0540-0
25. HuitingWu, Jingxu Zhang, Zilong Mi, Shuguang Xie*, Chao Chen* & Xiaojian Zhang. Biofilm bacterial communities in urban drinking water distribution systems transporting waters with different purification strategies. Appl Microbiol Biotechnol. 2015. 99, 4: 1947-1955
26. Shuming Liu, Han Che, Kate Smith, Chao Chen. A method of detecting contamination events using multiple conventional water quality sensors. Environmental Monitoring and Assessment. 2015; 187(1):4189
27. Pengfei Lin, Xiaojian Zhang, Jun Wang, Yani Zeng, Shuming Liu, Chao Chen*. Comparison of different combined treatment processes to address the source water with high concentration of natural organic matter during snowmelt period. Journal of Environmental Sciences, 2015. 27: 51-58.
28. Pengfei LIN, Yuan ZHANG, Xiaojian ZHANG, Chao CHEN*, Yuefeng XIE, I. H. (Mel) SUFFET. Adsorption kinetic and isotherm of chlorinated aromatic compounds on activated carbon to tackle the chemical spills in drinking water. Frontiers of Environmental Science and Engineering, 2015, 9(1): 138–146.
29. Pengfei Lin, Xiaojian Zhang, Hongwei Yang, Yong Li, Chao Chen*. Applying chemical sedimentation process in drinking water treatment plant to address the emergent arsenic spills in water sources. Frontiers of Environmental Science and Engineering. 2015. 9(1):50-57.
30. Xiaojian Zhang, Zilong Mi, Yang Wang, Shuming Liu Zhangbin Niu, Pinpin Lu, Jun Wang, Junnong Gu, Chao Chen*. Red Water Occurrence in Drinking Water Distribution Systems Caused by Changes in Water Source in Beijing, China: Mechanism Analysis and Control Measures. Frontier of Environmental Science and Engineering. 2014, 8, 3: 417-426.
31. WU Hui Ting, MI Zi Long, ZHANG Jing Xu, CHEN Chao and XIE Shu Guang. Bacterial Communities Associated with An Occurrence of Colored Water in An Urban Drinking Water Distribution System. Biomedical and Environmental Sciences. 2014, 27(8): 646-650.
32. Chao Chen*, Shannon Leavey, Stuart W Krasner; Mel H Suffet, Applying Polarity Rapid Assessment Method and Ultrafiltration to Characterize NDMA Precursors in Wastewater Effluents. Water Research. 2014. 57: 115-126. WOS:000337261400012
33. Xiaobin Liao, Chengkun Wang, Jun Wang, Xiaojian Zhang, Chao Chen*, Stuart W. Krasner, and I. H. (Mel) Suffet. Nitrosamine Precursor and DOM Control in a Wastewater-Impacted Drinking Water. Journal of American Water Works Association. 2014, 106, 7: 307-318. WOS:000338757400015
34. Pinpin Lu, Xiaojian Zhang, Chiqian Zhang, Zhangbin Niu, Shuguang Xie, Chao Chen*. Biostability in distribution systems in one city in southern China: characteristics, modeling and control strategy. Journal of Environmental Sciences-China. 2014; 26(2):323–331.
35. Chengkun Wang, Xiaojian Zhang, Jun Wang, Shuming Liu, Chao Chen*, Yuefeng Xie. Effects of organic fractions on the formation and control of N-nitrosamine precursors during conventional drinking water treatment processes. Science of the Total Environment. 2013, 449, 295-301
36. Wang C.K., Zhang X.J., Wang J., Chen C*. Characterization of dissolved organic matter as N-nitrosamine precursors based on hydrophobicity, molecular weight and fluorescence. Journal of Environmental Sciences-China. 2013, 25(1). 85-95.
37. Wang C.K., Zhang X.J., Wang J., Chen C*.  Factors controlling N-nitrosodimethylamine (NDMA) formation from dissolved organic matter. Frontier of Environmental Science and Engineering, 2013. 7(2): 151-157.
38. Pinpin Lu, Chao Chen, Qingfeng Wang, Zhao Wang, Xiaojian Zhang, Shuguang Xie. Phylogenetic diversity of microbial communities in real drinking water distribution systems. Biotechnology and Bioprocess Engineering. 2013, 18: 119-124
39. Liao X. B. Chen C. Zhang X. J. Xie S. G. Changes of biomass and bacterial communities in biological activated carbon filters for drinking water treatment. Process Biochemistry. 2013, 48: 312-316.
40. Xiaobin Liao, Chao Chen, Zhao Wang, Rui Wan, Chih-Hsiang Chang, Xiaojian Zhang, Shuguang Xie. Pyrosequencing analysis of bacterial communities in drinking water biofilters receiving influents of different types. Process Biochemistry. 2013, 48: 703-707.
41. Liao X.B., X.J. Zhang, J. Wang, C.K. Wang, C. Chen*. Combined conventional and O3-BAC process: a feasible solution for organic matters and antibiotics pollutants in a lake of East China. Water Science and Technology: Water Supply. 2013. 13, 6: 1470-1477.
42. Shuo Feng, Chao Chen, Qingfeng Wang, Zhiyu Yang, Xiaojian Zhang, Shuguang Xie. Microbial community in a full-scale drinking water biosand filter. Journal of Environmental Biology. 2013, 34, 321-324.
43. S. Feng, C. Chen, Q. F. Wang, X. J. Zhang, Z. Y. Yang, S. G. Xie. Characterization of microbial communities in a granular activated carbon–sand dual media filter for drinking water treatment. Int. J. Environ. Sci. Technol. 2013,10,5: 917-922  
44. Meng, FL, Liu, SM, Ostfeld, A, Chen, C, Burchard-Levine, A. A deterministic approach for optimization of booster disinfection placement and operation for a water distribution system in Beijing. Journal of Hydroinfomatics. 2013, 15, 3: 1042-1058.
45. David Hanigan, Jinwei Zhang, Pierre Herckes, Stuart Krasner, Chao Chen, and Paul Westerhoff.  Adsorption of N-Nitrosodimethylamine Precursors by Powdered and Granular Activated Carbon.  Environ. Sci. Technol. 2012, 46 (22), 12630–12639.
46. Liao XB, Chen C, Chang CH, Wang Z, Zhang XJ, Xie SG. Heterogeneity of microbial community structures inside the up-flow biological activated carbon (BAC) filters for the treatment of drinking water. Biotechnol Bioprocess Eng. 2012, 17: 881–886.
47. Shuo Feng, Shuguang Xie, Xiaojian Zhang, Zhiyu Yang, Wei Ding, Xiaobin Liao, Yuanyuan Liu, Chao Chen*. Ammonium removal pathways and microbial community in GAC-sand dual media filter in drinking water treatment. Journal of Environmental Sciences-China. 2012, 24(8): 1-8.
48. Feng, S, Zhang, XJ, Wang, QF, Wan, R, Chen, C, Xie, SG. Heterogeneity of ammonia-oxidizing community structures in a pilot-scale drinking water biofilter. International Biodeterioration & Biodegradation. 2012, 70: 148-152.
49. Yuqiao Chen, Chao Chen*, Xiaojian Zhang, Qi Zheng and Yuanyuan Liu. Inactivation of persistent Mycobacteria mucogenicum in water: chlorine resistance and mechanism analysis. Biomed. Environ. Sci. 2012, 25(2): 230-237.
50. Wang C.K., Zhang X.J., Wang J., Chen C*. Detecting N-nitrosamines in water treatment plants and distribution systems in China using ultra-performance liquid chromatography-tandem mass spectrometry. Frontier of Environmental Science and Engineering. 2012, 6(6): 770-777.
51. Du, PF， Chen, JN， Chen, C， Liu, Y， Liu, JG， Wang, HT， Zhang, XJ. Environmental risk evaluation to minimize impacts within the area affected by the Wenchuan earthquake. Science of the Total Environment. 2012, 419: 16-24.
52. X. J. Zhang, C. Chen*, P. Lin, A. Hou, Z. Niu, J. Wang. Emergency Drinking Water Treatment during Source Water Pollution Accidents in China: Origin Analysis, Framework and Technologies. Environ. Sci. Technol. 2011, 45, 1: 161-167.
53. LI Y. H., WANG J., ZHANG W., ZHANG X. J., CHEN C.*. Effect of Powdered Activated Carbon on Immersed Hollow Fiber Ultrafiltration Membrane Fouling Caused by Particles and Natural Organic Matter. Desalination. 2011, 278, 1-3: 443-446 .
54. LI Y. H., WANG J., ZHANG W., ZHANG X. J., CHEN C.*. Effects of coagulation on submerged ultrafiltration membrane fouling caused by particles and natural organic matter. Chinese Science Bulletin, 2011, 56, 6:584-590.
55. C. Chen*, X. J.  Zhang, L. X. Zhu, W.J. He, H. D. Han. Changes in different organic matter fractions during conventional treatment followed by advanced treatment. Journal of Environmental Sciences-China. 2011, 23, 4: 582-586.
56. W. Zhang, X. J. Zhang, Y. H. Li, J. Wang, C. Chen*. Membrane flux dynamic in the submerged ultrafiltration hybrid treatment process when removing particles and natural organic matter. Journal of Environmental Sciences-China. 2011, 23, 12: 1970-1976.
57. X.J. Zhang, C. Chen*, J. Ding, A. Hou, Y. Li , Z. Niu, X. Su, Y. Xu, E. Laws. The 2007 water crisis in Wuxi, China: analysis of the origin. Journal of Hazardous Material. 2010, 182, 130-135.
58. Y. H. Li, W Zhang, X. J. Zhang, C. Chen*, J. Wang. Characterization of fouling in immersed polyvinylidence fluoride hollow fibre membrane ultrafiltration by particles and natural organic matter. Desalination and Water Treatment. 2010 18: 309-314.
59. Xiaojian ZHANG, Chao CHEN*. Emergency drinking water treatment in source water pollution incident: Technology and practice in China. Frontier of Environmental Science and Engineering in China. 2009, 3(3):364-368.
60. Li Y, Zhang X, Chen C. Reviews on Analytical Technologies of Sulfur Odorants in Water with Chromatography. Progress in Chemistry. 2009. 21(12):2718-2725.
61. Wang, Y,  Zhang, XJ,  Feng S, Chen C. Study on inactivation of iron bacteria isolated from real drinking water distribution systems by free chlorine and chloramine. Annals of Microbiology, 2009, 59 (2): 353-358.
62. C. Chen*, X. J. Zhang, L. Zhu, J. Liu, W. He, and H. Han. Disinfection by-products and their precursors in a water treatment plant in north China: seasonal changes and fraction analysis. Science of the Total Environment. 2008, 397: 140-147. 
63. S. B. Xie, J. Yang, C. Chen, X. J. Zhang, Q. L. Wang, C. Zhang. Study on biosorption kinetics and thermodynamics of uranium by Citrobacter freudii. Journal of Environmental Radioactivity. 2008. 99, 1, 126-133.
64. C. Chen*, X. J. Zhang, W. J. He, and H. D. Han. Comparison of seven kinds of drinking water treatment processes to enhance organic material removal: a pilot test. Science of the Total Environment. 2007, 382: 93-102.  
65. C. Chen*, X. J. Zhang, W. J. He, and H. D. Han. Simultaneous Control of Microorganisms, Disinfection By-products by Sequential Chlorination. Biomed. Environ. Sci. 2007, 20:119-125.
66. X. J. Zhang, C. Chen*, and Y. Wang. Synergetic inactivation of microorganisms by short-term free chlorination and subsequent monochloramination in drinking water disinfection. Biomed. Environ. Sci. 2007, 20:373-380.
67. C. Chen*, X. J. Zhang, Y. wang, L. Zhu and J. Liu. Waste water disinfection during SARS epidemic: aiming for microbiological and toxicological control. Biomed. Environ. Sci., 2006, 19: 173-178.
* Corresponding author

PLENARY CONFERENCE SPEECHES
1. Chao Chen. A Tale of Two DBPs in China: Carbonaceous DBPs vs. Nitrogenous DBPs. 2nd IWA Disinfection and Disinfection By-Products conference. May 14-18, 2018. Beijing, China. Plenary presentation.
2. Chao Chen. Nitrosamine Precursor Characterization, Tracing and Control Some New Insights by the Polarity Rapid Assessment Method (PRAM). July 31 - August 4, 2017. Mount Holyoke College. South Hadley, MA. Plenary presentation.
3. Chao Chen. Engineer’s Choice to Address the Nitrosamine Concern in Drinking Water Systems around China. Xiang Shan Science Conferences, 595th Session, Health Risk & Control of DBPs in China. Plenary presentation.

 PATENTS
1. Xiaojian ZHANG, Deyang SHENG, Chao CHEN, et al. A method for removing thallium in drinking water source. Chinese Patent: ZL 2011102312273
2. Xiaojian ZHANG, Zilong MI, Chao CHEN, et al. A method for investigating the iron stability of inner scale of drinking water pipeline. Chinese Patent: ZL 2011102583805
3. Wenjie HE, Xiaojian ZHANG, Jianwei BO, Chao CHEN, et al. A mobile pilot test instrument for emergency drinking water treatment. Chinese Patent: ZL 2011102978000
4. Hong DONG, Xiaojian ZHANG, Nan YANG, Chao CHEN, et al. An integrated and mobile instrument of powder reagents solution and feeding. Chinese Patent: ZL 2011101552104. 2012
5. Xiaojian Zhang, Chao Chen, et al. The air stripping for halogenated hydrocarbon removal in drinking water supply. Chinese Patent: ZL 2010105233550. 2012
6. Xiaojian Zhang, Wei Zhang, Chao Chen, et al. A waterfall biofilter for pre-treatment of drinking water supply in rural area. Chinese Patent: ZL  2010102754679, 2012
7. Xiaojian Zhang, Yue Zhang, Chao Chen, et al. Removal of metal contaminants in water by alkaline sedimentation, Chinese Patent: ZL 2008100560046, 2010.10
8. Xiaojian Zhang, Chao Chen, Wenjie He and Hongda Han, System for addition and quick mixing of ammonia in clear well, Chinese Patent: ZL 2005100866096, 2007.3
9. Xiaojian Zhang, Chao Chen, Wenjie He and Hongda Han, Sequential chlorination of short-term free chlorination and subsequent monochloramination, Chinese Patent: ZL 2004100427906, 2006.10.