發(fā)布時(shí)間：2018-04-25 17:36

  本文選題：鐵嶺市 + 河流��； 參考：《沈陽理工大學(xué)》2015年碩士論文

【摘要】：為全面了解鐵嶺市河流污染特征及污染物來源,研究對鐵嶺市22條河流共52個(gè)斷面進(jìn)行了現(xiàn)場調(diào)查。研究時(shí)段為2013年7月~2014年7月,開展逐月樣品采集工作(2013.12-2014.3未進(jìn)行樣品采集)。測定指標(biāo)包括p H、總氮、總磷、氨氮、硝氮、磷酸鹽(以P計(jì))、BOD5、CODMn等項(xiàng)目。研究主要對調(diào)查河流水污染狀況的時(shí)空特征進(jìn)行分析。并以氨氮為評價(jià)指標(biāo),分別采用利用單因子評價(jià)法、綜合水質(zhì)標(biāo)識指數(shù)法評價(jià)了河流的水質(zhì)狀況,識別河流了的主要污染因子。同時(shí),采用硝酸鹽氮氧雙同位素技術(shù)對河流水體硝氮來源及其時(shí)空異質(zhì)性進(jìn)行了分析。本文主要研究結(jié)果如下:(1)總氮、硝氮和氨氮濃度呈現(xiàn)為枯水期濃度平水期濃度豐水期濃度,西部河流氮素濃度整體高于東部河流,硝氮是總氮的主要賦存形式,約占TN的75%,氨氮是河流氮污染的特征污染物。溶解性總磷濃度值約占總磷的76%,空間分布與總氮相似�？偭诐舛缺憩F(xiàn)為平水期高于枯水期和豐水期。(2)CODMn監(jiān)測周期的濃度監(jiān)測值范圍為1.11~23.62 mg/L,平均值為4.86mg/L,流域年均濃度呈現(xiàn)出平水期豐水期枯水期的趨勢。BOD5全年濃度監(jiān)測值范圍為2.17~40.80 mg/L,平均值為7.64mg/L,枯水期河流水體的BOD5濃度值高于豐、平水期。二道河年均濃度最高,中固河年均濃度最低。(3)單因子評價(jià)法和綜合水質(zhì)標(biāo)識指數(shù)法的出的河流的主要污染因子基本一致,兩種評價(jià)方法得出48個(gè)斷面的主要污染因子相同,占評價(jià)斷面總數(shù)的92%。綜合兩種評價(jià)方法,22條河流的主要污染因子是BOD5,其次是氨氮和總磷。(4)鐵嶺市河流水體硝氮δ15N和δ18O的平均值分別為+9.7‰和+1.8‰。22條河流氮的主要來源為人畜排泄物(11條河流)及工業(yè)和生活污水(8條河流)。不同水期,一些河流氮的主要來源有所差異;條子河、碾盤河豐水期河流氮主要來源于化肥和土壤氮,而枯水期河流氮主要來源于工業(yè)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，

本文編號：1802302