Peripheral Water Quality Analysis from Pipe Networks in Some Districts of Shanghai in 2010-2014

Objective To understand the status and changing trend of the quality in peripheral water from water pipe networks as well as to provide suggestions for supervision.

Method The data were collected and classified by Excel 2007 and analyzed by SPSS 20.0.

Results The overall qualified rate was 44.2% and the annual qualified rate in 2010-2014 was 50.0%, 34.8%, 26.4% and 71.7%, respectively (P < 0.05), the seasonal qualified rate was 35.4%, 40.0%, 56.2% and 45.6%, respectively (P < 0.05). The water quality in August (31.4%), January (33.3%) and April (34.0%) was the worst. Only oxygen consumption and manganese content among 8 monitoring indexes were different (P < 0.05) annually and monthly; the top three unqualified monitoring indexes were oxygen consumption (72.6%), manganese content (17.6%) and total bacteria counts (6.1%).

Conclusions The quality of peripheral water fluctuated strongly in recent five years, the quality has become better in recent three years.We should focus on strengthening supervision in the Spring as well as put emphasize on reducing oxygen consumption and manganese content to further improve water quality.