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污水生物脱氮~(15)N标识实验研究与生产工艺分析
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摘要
摘 要
    随着工农业的迅速发展,水体污染现象日益严重。加强污水处理,控制氮、
    磷等营养性物质进入水体是防止水体污染的主要途径。生物脱氮技术因其特有的
    技术经济优势,受到了人们的普遍重视。但是,目前我国城市污水处理厂多数采
    用单纯以去除有机物为目标的传统工艺。此外,现有的工艺还存在运行不稳定,
    自动化程度低等不足。为此,本文在借鉴国内外已取得的研究成果的基础上,进
    行生物脱氮的理论与实验研究,为污水处理厂分期分批建造设计或改造提供实验
    技术参考和理论依据。
    实验室研究,采用 N 同位素标识技术对生物反硝化过程进行了研究。结果
     15
    表明:在含 N 标识的人工配制硝酸盐培养液中,发生反硝化作用时,溶液中剩
    15
    余硝酸盐内仍含有 N 值,生物体内 N 值增大,同时产生含 N 的氮气。研究
     15 15 15
    成果更正了前人研究的问题,说明 N 在检测反硝化反应的定性、定量关系中是
     15
    行之有效的,为污水微生物除氮研究提供了创新的、实用的实验技术和理论方法。
    生产性试验研究,是以正在运行的两座污水处理厂为研究现场。结果表明:
    两座污水厂都是采用 A/O 工艺,由于回流系统不同,曝气池的结构不同,导致
    总氮去除效果相差很大。溶解氧、污泥的 BOD 负荷、污泥回流比对脱氮反应等
    影响较明显。增设内回流、降低污泥的有机底物负荷是提高脱氮率的关键。但有
    机底物负荷太低,容易发生污泥膨胀。根据进水水质及时对水厂的运行进行调控,
    是保障脱氮效果的关键。
    此外,本论文还探讨了目前实用的脱氮处理工艺,并简单的进行说明,并预
    测今后脱氮工艺发展趋势。
With the rapid development of industry and agriculture, water body has been
    increasing polluted. Strengthening sewage disposal, controlling nitrogen, phosphorus
    nutrition material enter water body to prevent main way of water pollution from. The
    biological N and P removal technology has been used successfully to treat a variety of
    pollutants, particularly effective in nitrogen removal from wastewater. In China, most
    of the municipal wastewater is still treated with traditional methods, which can only
    remove organics (COD). In addition, most of the municipal wastewater plant runs
    unstably, and the level of automatic control is still lower. This dissertation studies the
    mechanisms and processes of biological nitrogen removal from municipal wastewater.
    And presents the plant experiment technique reference and theory in the staged
    planning and reconstruct.
     Laboratory experiment used N isotope identification technology to study the
     15
    process of microbial denitrificatio. The result showed that the δ15N of residual nitrate
    and the bacterial body increased in manual configurating nitrate culture which 15N
    isotope when the denitrification acted. And gas, which had 15N isotope, had been
    increasing during the process of denitrification. The research proved that the δ15N
    value was very effective to determine the qualitative and quantitative relationship,
    which affords practice experiment technique and theoretic method to the research on
    the wastewater denitrification.
     Two wastewater processing plants in Beijing were selected to do producing
    experiment and denitrificate application analysis. The result showed that the TKN
    removal efficiency was different between two plants, although they have the same
    A/O nitrogen removal process. They have different return sludge system and structure
    of the oxidation bank. The dissolved oxygen and organic loading have more
    significant effects on nitrogen removal efficiency. The TKN removal efficiency can
    increase by increasing sludge return ration and decreasing sludge loading. Only BOD
    loading is too slow, occurrence apt sludge expands. To protect good effluent, it is
     - II -
    
    
    ABSTRACT
    important to adjust operation according to change of influent.
     Furthermore, the dissertation discussed practice denitrification technique, and
    explained simply, and prospected the future development.
引文
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