排序方式: 共有7条查询结果,搜索用时 15 毫秒
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Chaojin Jiang Xiaoqian Jiang Lixun Zhang Yuntao Guan 《Frontiers of Environmental Science & Engineering》2020,14(3):47
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在测定市政污泥、印染污泥和造纸污泥中汞含量及其存在形态分布特征的基础上,通过模拟实验,系统研究了不同类型污泥中汞存在形态在干化过程中的动态变化,同时分析了污泥中汞含量和各存在形态发生变化的原因.结果表明,市政污泥的汞含量依次大于印染污泥和造纸污泥;污泥中无酸溶态汞和可还原态汞,只存在可氧化态汞和残渣态汞;被试污泥在25~100℃干化时,含水率降低不会导致汞的析出;在100~200℃干化时,污泥中汞含量随温度的升高呈现出缓慢降低的趋势;当干化温度200~300℃时,随污泥中有机质和硫化物的分解,可氧化态汞消失;当干化温度达到400℃时,污泥中汞不复存在. 相似文献
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Zhao Bo Nakada Norihide Hanamoto Seiya Zhang Lixun Wong Yongjie 《Environmental science and pollution research international》2021,28(9):10889-10897
Environmental Science and Pollution Research - Disinfection by-products (DBPs) discharged from sewage treatment plants (STPs) could harm downstream receiving waters and drinking water resources.... 相似文献
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Membrane fouling is an obstacle impeding the wide applications of ceramic membranes and organics are responsible for most of the membrane fouling issues in wastewater treatment. In this study, Fenton cleaning strategy was firstly proposed to clean ceramic membrane fouling in wastewater treatment. Fe~(2+)efficiently catalyzed fouling cleaning with H_2O_2(1.5%) to recover the filterability of ceramic membrane. The maximum ΔTMP recovery(over 99%) was achieved at an optimal Fe~(2+)dosage of 124 mg/L after 6 hr of immersion cleaning. The total residual membrane fouling resistance decreased gradually from this optimum value as the Fe~(2+)dosage increased above 124 mg/L. The residual hydraulically reversible fouling resistance accounted for most of the membrane fouling and was basically removed(≤3.0 × 10~9 m~(-1)) when Fe~(2+)dosages higher than 124 mg/L were used. The foulants responsible for the formation of a residual hydraulically reversible fouling layer(DOC(dissolved organic carbon), proteins, polysaccharides, EEM(fluorescence excitationemission matrix spectra), SS(suspended solids), and VSS(volatile suspended solids)) were gradually removed as the Fe~(2+)dosage increased. These residual organic foulants were degraded from biopolymers(10–200 kDa) to low molecular weight substances(0.1–1 kDa),and the particle size of these residual foulants decreased significantly as a result. The strong oxidation power of hydrogen peroxide/hydroxy radicals towards organic foulants was enhanced by Fe~(2+). Fe~(2+)played a significant role in the removal of hydraulically reversible fouling and irreversible fouling from the ceramic membrane. However, Fe~(2+)(≥ 124 mg/L) increased the likelihood of forming secondary iron-organics aggregates. 相似文献
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Wei Mao Lixun Zhang Tianye Wang Yichen Bai Yuntao Guan 《Frontiers of Environmental Science & Engineering》2021,15(4):52
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