華北平原是中國(guó)重要的政治、經(jīng)濟(jì)、文化中心,一直面臨著嚴(yán)重的水資源短缺問(wèn)題。由于地表水資源嚴(yán)重短缺及水質(zhì)惡化,地下水已成為工農(nóng)業(yè)和生活用水的主要供應(yīng)水源,超過(guò)總供水量的70%。廣泛的地下水超采導(dǎo)致了一系列的地質(zhì)和環(huán)境問(wèn)題。再生水入滲回補(bǔ)含水層能有效地緩解這一局面。然而,再生水入滲過(guò)程中仍然存在許多風(fēng)險(xiǎn)。已有研究表明,沉積物中的砷釋放是地下水人工回補(bǔ)中最常見(jiàn)的二次污染。和自然體系相比,再生水中的有機(jī)質(zhì)含量高,其可能會(huì)導(dǎo)致入滲過(guò)程中砷的釋放。然而,現(xiàn)有研究對(duì)于這一過(guò)程中砷釋放的風(fēng)險(xiǎn)及機(jī)理仍然欠缺。為了探討這一問(wèn)題,本研究采用室內(nèi)試驗(yàn)的方法對(duì)再生水入滲過(guò)程中砷釋放的風(fēng)險(xiǎn)及影響砷釋放的主要因素進(jìn)行了探究。分別采集了保定平原的鉆孔沉積物樣品和北運(yùn)河河床沉積物,對(duì)其化學(xué)性質(zhì)進(jìn)行分析。結(jié)果表明沉積物粒徑與其砷(As)含量之間存在顯著的線性正相關(guān)性。兩種沉積物都表現(xiàn)為,沉積物粒徑越小,其As含量越高。保定平原的沉積物總體來(lái)看總有機(jī)碳(TOC)含量低(0.071%±0.052%),較細(xì)的沉積物經(jīng)歷了更強(qiáng)的風(fēng)化過(guò)程,含有更多的鐵和錳氧化物礦物質(zhì),吸附了更多的TOC,并具有更大的比表面積,從而促進(jìn)了As的富集(...

【文章頁(yè)數(shù)】：99 頁(yè)

【學(xué)位級(jí)別】：碩士

【文章目錄】：
ABSTRACT(In English)
ABSTRACT(In Chinese)
Chapter 1 Introduction
    1.1 Background and significance
    1.2 Literature review
        1.2.1 Risks of reclaimed water infiltration
        1.2.2 Dissolved organic matter in reclaimed water
        1.2.3 As mobilization
    1.3 Scientific questions
    1.4 Research content and route
        1.4.1 Research objective and content
        1.4.2 Research route
Chapter2 Sediment Geochemical Characteristics in Boreholes of Baoding Plain and the Riverbed of Beiyun River
    2.1 Site description
        2.1.1 Baoding Plain
        2.1.2 Beiyun River
    2.2 Laboratory analytical methods
    2.3 Results and discussion
        2.3.1 Baoding Plain
        2.3.2 Beiyun River
    2.4 Conclusion
Chapter3 Arsenic Release from Sediments Incubated with Reclaimed Water
    3.1 Incubation experiment
        3.1.1 Batch experiment design
        3.1.2 Analytical methods
    3.2 Results and discussion
        3.2.1 Chemical parameters in reclaimed water
        3.2.2 As release during incubation
        3.2.3 Characteristics of DOM
    3.3 Conclusions
Conclusions and Future Perspectives
結(jié)論與展望
References
Appendix
Acknowledgements



本文編號(hào)：4021412