Research On Disinfection By-products And The Change Trend Of The Pearl River, Guangdong

In order to ensure the safe drinking water of the people, to provide a reference for surfacewater environmental quality standards for the relevant water management authorities, find aequilibrium point of the economic development and water environment, to provide historicalreference for the study of the Pearl River basin water environmental change. This paperanalysised Guangdong Province of the Pearl River Basin, including the West River （WuzhouW1, Deqing W2, Zhaoqing W3）, the North River （Shaoguan N1, Yingde N2, Qingyuan N3）,the East River （Heyuan E1, Huizhou E2, Dongguan E3） and Guangzhou （C1, C2, C3）, a totalof29sampling points, during2009to2010.8water quality index, including pH, electricalconductivity （EC）, ammonia （NH₃-N）, total nitrogen （TN）, nitrate nitrogen （NO₃^--N）,phosphate (PO₄^3-), dissolved organic carbon （DOC）, UV₂₅₄, were tested in accordance withnational standards. Chlorination experiments used UFC conditions for, gas chromatography（GC-ECD） determination of two typical types of disinfection byproducts （of DBPs）:trihalomethanes （THMs） and halogen acetonitrile （HANs）. Using origin8.0software and theSPSS17.0Software analysised the variation tendency of the Pearl River and the relationshipamong the water quality index; and the effect dissolved organic nitrogen （DON） on theDBPFP （DBP formation potential） and the DBPFP change on dry and rainy season. Theconclusions are as follows:1)The trend of water quality concentrations was Guangzhou> East River> Northriver> West River in space, and its concentration increases gradually along the runoff flowswithin their basin. There was a higher concentration in July, October at Guangzhou, but, nofixed variation trend for other three main streams. NH₃-N accounted for TN50%（w/w）,NO₃^--N accounted for TN about30%（w/w）, DON accounted for TN about20%（w/w）. DON(mg L^-1)=0.667*NO₃^--N (mg L^-1)–0.161*NH₃-N (mg L^-1)+0.044，R²=0.640.2)There is a linear relationship between DON and HANFP, R_{East river}²（0.631）≈R_{North rive}²（r0.630）> R_{pearl rive}²（r0.440）> R_{West rive}²（r0.388）> R_Guangzhou²（0.108），HANFP(mg L^-1)=3.603*DOC (mg L^-1)－5.489*DON (mg L^-1)－3.301*NO3—N (mg L^-1)+2.172，R²=0.978.3)The THMFP of dry and rainy season in West River approximately equaled to 92.52μg L^-1. The THMFP value of rainy season was higher than the THMFP value of dryseason at Guangzhou and East River, a contrast trend at North River. The THMFP value ofrainy and dry season at Guangzhou was763.01,488.52μg L^-1, respectively. The THMFPvalue of rainy and dry season at East River was299.11,263.49μg L^-1, respectively. TheTHMFP value of rainy and dry season at North River was197.89,165.98μg L^-1, respectively.For all water bodies, the average HANFP value of rainy season was higher than the averageHANFP value of dry season The HANFP value of rainy and dry season at Guangzhou was68.37,38.24μg L^-1, respectively. The HANFP value of rainy and dry season at East Riverwas27.92,23.16μg L^-1, respectively. The HANFP value of rainy and dry season at NorthRiver was15.30,14.60μg L^-1, respectively. The HANFP value of rainy and dry season atWest River was8.45,7.79μg L^-1, respectively.4)The average SHANFP value of the rainy and dry season at West River and East Riverwas basically the same. The SHANFP value of rainy season was higher than the SHANFPvalue of dry season at Guangzhou and North River. During the dry season, the averageSHANFP value was: East River (3.98μg mg^-1)≈West River (3.91μg mg^-1)> North river(3.49μg mg^-1)> Guangzhou (2.39μg mg^-1). During the rainy season, according to theaverage SHANFP value was West River (3.95μg mg^-1)≈East River (3.91μg mg^-1)> NorthRiver (3.72μg mg^-1)> Guangzhou (2.63μg mg^-1). There was no linear relationship amongDOC/DON, STHMFP and SHANFP, respectively.