铁岭市河流污染特征研究

发布时间：2018-04-25 17:36

  本文选题：铁岭市 + 河流　； 参考：《沈阳理工大学》2015年硕士论文

【摘要】：为全面了解铁岭市河流污染特征及污染物来源,研究对铁岭市22条河流共52个断面进行了现场调查。研究时段为2013年7月~2014年7月,开展逐月样品采集工作(2013.12-2014.3未进行样品采集)。测定指标包括p H、总氮、总磷、氨氮、硝氮、磷酸盐(以P计)、BOD5、CODMn等项目。研究主要对调查河流水污染状况的时空特征进行分析。并以氨氮为评价指标,分别采用利用单因子评价法、综合水质标识指数法评价了河流的水质状况,识别河流了的主要污染因子。同时,采用硝酸盐氮氧双同位素技术对河流水体硝氮来源及其时空异质性进行了分析。本文主要研究结果如下:(1)总氮、硝氮和氨氮浓度呈现为枯水期浓度平水期浓度丰水期浓度,西部河流氮素浓度整体高于东部河流,硝氮是总氮的主要赋存形式,约占TN的75%,氨氮是河流氮污染的特征污染物。溶解性总磷浓度值约占总磷的76%,空间分布与总氮相似。总磷浓度表现为平水期高于枯水期和丰水期。(2)CODMn监测周期的浓度监测值范围为1.11~23.62 mg/L,平均值为4.86mg/L,流域年均浓度呈现出平水期丰水期枯水期的趋势。BOD5全年浓度监测值范围为2.17~40.80 mg/L,平均值为7.64mg/L,枯水期河流水体的BOD5浓度值高于丰、平水期。二道河年均浓度最高,中固河年均浓度最低。(3)单因子评价法和综合水质标识指数法的出的河流的主要污染因子基本一致,两种评价方法得出48个断面的主要污染因子相同,占评价断面总数的92%。综合两种评价方法,22条河流的主要污染因子是BOD5,其次是氨氮和总磷。(4)铁岭市河流水体硝氮δ15N和δ18O的平均值分别为+9.7‰和+1.8‰。22条河流氮的主要来源为人畜排泄物(11条河流)及工业和生活污水(8条河流)。不同水期,一些河流氮的主要来源有所差异;条子河、碾盘河丰水期河流氮主要来源于化肥和土壤氮,而枯水期河流氮主要来源于工业和生活污水。
[Abstract]:In order to understand the pollution characteristics and pollution sources of rivers in Tieling, 52 sections of 22 rivers in Tieling were investigated. The research period is from July 2013 to July 2014. The determination indexes include pH, total nitrogen, total phosphorus, ammonia nitrogen, nitrate nitrogen, phosphate (in terms of P, BOD5, CODMn, etc.) The main purpose of this study is to analyze the temporal and spatial characteristics of river water pollution. Taking ammonia nitrogen as the evaluation index, the single factor evaluation method and the comprehensive water quality marking index method were used to evaluate the water quality of the river and to identify the main pollution factors of the river. At the same time, the sources of nitrate and nitrogen and their temporal and spatial heterogeneity were analyzed by using nitrate nitrogen and oxygen double isotope technique. The main results of this paper are as follows: total nitrogen, nitrate nitrogen and ammonia nitrogen concentration are the concentration in the dry season, the concentration in the high water period, the nitrogen concentration in the western river is higher than that in the eastern river, and the nitrate nitrogen is the main form of the total nitrogen. About 75% of TN, ammonia nitrogen is the characteristic pollutant of river nitrogen pollution. The concentration of dissolved total phosphorus is about 76% of total phosphorus, and the spatial distribution is similar to that of total nitrogen. The concentration of total phosphorus in the plain water period is higher than that in the dry and high water periods. The concentration monitoring range is 1.110.23.62 mg / L, the average value is 4.86 mg / L, and the average annual concentration of the basin is 4.86 mg / L. The average annual concentration of the basin shows the trend of the dry season in the high water season. BOD5 annual concentration monitoring value is normal. The average value is 7.64 mg / L, and the BOD5 concentration of river water is higher than that of abundant water in dry season. Average water period The average annual concentration of Erdao River is the highest, and the average annual concentration of Zhonggu River is the lowest. The main pollution factors of the rivers produced by the single factor evaluation method and the comprehensive water quality marking index method are basically the same. The main pollution factors of 48 sections are the same by the two evaluation methods. Accounting for 92% of the total number of evaluation sections. The main pollution factors of 22 rivers are BOD5, followed by ammonia nitrogen and total phosphorus.) the average values of nitrate 未 15N and 未 18O in river water of Tieling city are 9.7 鈥，

本文编号：1802302