**Acknowledgements**

The first author acknowledges Japan Society for the Promotion of Science (JSPS) for funding in his research. We are also highly thankful to Mr. Md. Rumainul Islam, Environment Engineering Program, Chongqing University and Md. Mosfeq-Ul-Hasan, Zhejiang University, Hangzhou, China for providing us several supporting articles. As page limitation precluded us from citing a large number of studies, we apologize to those whose original publications are therefore not directly referenced in this chapter.
