Analysis on the causes of water contaminated by toxic and harmful substances in the Yangtze River Delta

In recent years, with the rapid development of economy in the Yangtze River Delta, the water pollution are becoming more and more serious. The expansion of urban agglomeration also makes water pollution show significant regional and complex nature. This paper takes water quality of the Yangtze River Delta as an example, the toxic and harmful substances such as ammonia nitrogen, petroleum, volatile phenol and cyanide discharged from waste water were analysed, which has led to increasing attention being paid to the phenomenon of water contaminated by toxic and harmful substances. The causes of water pollution in the Yangtze River Delta are considered to solve the problem of subsequent pollution control. In conclusion, this paper analyzed the causes of water pollution in this area from the angles of geographical environment, legal system, economic development model and so on, and expected to provide the basis for water pollution control.