One-year monitoring of rain and snow water quality and its pollution causes in a campus in Tianjin
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Abstract:
In order to reduce the cost of rainwater utilization and ensure the quality of rainwater that can be used, discharge first flush and special rainwater with poor water quality has become an important way in rainwater utilization. Therefore, it is necessary to determine the reasonable rainwater discharge method thr ough long-term continuous monitoring of key water quality indicators such as nitrogen, pho sphor us, and chemical oxygen demand in rain or snow water. One-year continuous monitoring of rain and snow water was conducted in the Peiyang Campus of Tianjin University in 2018. Results show that: the average mass concentration of ammonia nitrogen ( 6.75 mg/ L) and total nitrogen ( 9.36 mg / L) in rain and snow water in March and April was about 1.5 and 2.1-folds times the annual average mass concentration of ammonia nitrogen and total nitrogen in rain and snow water; the mass concentration of contaminants in the first r ainwater in spring is much higher than that of the first snow in winter, and air pollution in winter is the key factor for poor r ainwater quality of the first rainfall in spring ; in addition, the influence sequence of the air contaminants to the rainwater and snow water quality was PM2. 5 > PM 10 > NO2 > SO2 > CO> O3_8h . The mass concent ration of contaminants in the first two rainw ater in spring was higher than the other rain and snow water, but the quantity of precipitation was very small. Therefore, the first two rainfall in spring ( precipitation less than 10 mm) may be directly discharged to the wastewater treatment plant rather than directly flow into the r ainwater recycling facilities.
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