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  1. Artikel ; Online: Degradation of ammonia nitrogen by an economic combined hydrodynamic cavitation method.

    Feng, Zhongying / Wang, Fengyu / Zhu, Kaijin / Wang, Zirong / Ning, Jian

    Environmental science and pollution research international

    2023  Band 30, Heft 28, Seite(n) 72782–72792

    Abstract: Hydrodynamic cavitation (HC) was a kind of advanced oxidation mode. There were defects in the common HC devices, such as high energy consumption, low efficiency, and easy plugging. In order to effectively utilize HC, it was urgent to research new HC ... ...

    Abstract Hydrodynamic cavitation (HC) was a kind of advanced oxidation mode. There were defects in the common HC devices, such as high energy consumption, low efficiency, and easy plugging. In order to effectively utilize HC, it was urgent to research new HC devices and used them together with other traditional water treatment methods. Ozone was widely used as a water treatment agent that does not produce harmful by-products. Sodium hypochlorite (NaClO) was efficient and cheap, but too much chlorine will be harmful to water. The combination of ozone and NaClO with the HC device of propeller orifice plate can improve the dissolution and utilization rate of ozone in wastewater, reduce the use of NaClO, and avoid the generation of residual chlorine. The degradation rate reached 99.9% when the mole ratio γ of NaClO to ammonia nitrogen (NH
    Mesh-Begriff(e) Ammonia/analysis ; Ammonia/chemistry ; Chlorine ; Hydrodynamics ; Nitrogen ; Ozone ; Wastewater ; Water Purification
    Chemische Substanzen Ammonia (7664-41-7) ; Chlorine (4R7X1O2820) ; Nitrogen (N762921K75) ; Ozone (66H7ZZK23N) ; Wastewater
    Sprache Englisch
    Erscheinungsdatum 2023-05-13
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-023-27504-1
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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    Z 5915: Hefte anzeigen

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  2. Artikel ; Online: Effect of cold plasma on breaking activated sludge and the output dominance of protein

    Zhu, Pengyu / Sun, Xiuyun / Zhu, Kaijin / Li, Wenbo / Le, Qingling

    Environmental Technology. 2023 May 25, v. 44, no. 12 p.1763-1771

    2023  

    Abstract: Upon contacting with water, cold plasma should produce numerous ozone molecules and free electrons at room temperature. In this study, a cold plasma generator was used to break the walls of residual activated sludge obtained from domestic sewage. The ... ...

    Abstract Upon contacting with water, cold plasma should produce numerous ozone molecules and free electrons at room temperature. In this study, a cold plasma generator was used to break the walls of residual activated sludge obtained from domestic sewage. The impact was mainly influenced by the ozone generated. With 800 W power, sludge wastewater pH of 12.0, and under continuous treatment for 10 h, the system’s reduction efficiency for the dry sludge was ≈90%. Furthermore, the organic matter content (especially protein) of the upper layer of the sludge solution increased a lot after the sludge digestion. This observation proved the reduction of sludge from both sides. Moreover, when the cold plasma technique was compared with thermal acid hydrolysis, thermal alkali hydrolysis, and ultrasonication for extracting protein from activated sludge, cold plasma wall-breaking sludge exhibited the highest efficiency, reaching 38.2% under ambient temperature. After the analysis, the toxic metal content in the extracted protein was near zero, which is a level other protein extraction methods via sludge breaking have not achieved to date, we attribute this efficiency to free electrons the cold plasma produce. These species promote the transformation of metal ions into atomic metals, thereby facilitating their removal.
    Schlagwörter acid hydrolysis ; activated sludge ; alkaline hydrolysis ; ambient temperature ; cold ; digestion ; environmental technology ; organic matter ; ozone ; pH ; sewage ; toxicity ; ultrasonic treatment ; wastewater ; Cold plasma ; residual activated sludge ; breaking ; protein extraction ; harmless
    Sprache Englisch
    Erscheinungsverlauf 2023-0525
    Umfang p. 1763-1771.
    Erscheinungsort Taylor & Francis
    Dokumenttyp Artikel ; Online
    ISSN 1479-487X
    DOI 10.1080/09593330.2021.2012268
    Datenquelle NAL Katalog (AGRICOLA)

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  3. Artikel ; Online: Effect of cold plasma on breaking activated sludge and the output dominance of protein.

    Zhu, Pengyu / Sun, Xiuyun / Zhu, Kaijin / Li, Wenbo / Le, Qingling

    Environmental technology

    2022  Band 44, Heft 12, Seite(n) 1763–1771

    Abstract: Upon contacting with water, cold plasma should produce numerous ozone molecules and free electrons at room temperature. In this study, a cold plasma generator was used to break the walls of residual activated sludge obtained from domestic sewage. The ... ...

    Abstract Upon contacting with water, cold plasma should produce numerous ozone molecules and free electrons at room temperature. In this study, a cold plasma generator was used to break the walls of residual activated sludge obtained from domestic sewage. The impact was mainly influenced by the ozone generated. With 800 W power, sludge wastewater pH of 12.0, and under continuous treatment for 10 h, the system's reduction efficiency for the dry sludge was ≈90%. Furthermore, the organic matter content (especially protein) of the upper layer of the sludge solution increased a lot after the sludge digestion. This observation proved the reduction of sludge from both sides. Moreover, when the cold plasma technique was compared with thermal acid hydrolysis, thermal alkali hydrolysis, and ultrasonication for extracting protein from activated sludge, cold plasma wall-breaking sludge exhibited the highest efficiency, reaching 38.2% under ambient temperature. After the analysis, the toxic metal content in the extracted protein was near zero, which is a level other protein extraction methods via sludge breaking have not achieved to date, we attribute this efficiency to free electrons the cold plasma produce. These species promote the transformation of metal ions into atomic metals, thereby facilitating their removal.
    Mesh-Begriff(e) Sewage/chemistry ; Plasma Gases/analysis ; Waste Disposal, Fluid/methods ; Wastewater ; Metals ; Proteins ; Ozone
    Chemische Substanzen Sewage ; Plasma Gases ; Wastewater ; Metals ; Proteins ; Ozone (66H7ZZK23N)
    Sprache Englisch
    Erscheinungsdatum 2022-01-05
    Erscheinungsland England
    Dokumenttyp Journal Article
    ISSN 1479-487X
    ISSN (online) 1479-487X
    DOI 10.1080/09593330.2021.2012268
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  4. Artikel: Effect of high-temperature thermal hydrolysis on rheological properties and dewaterability of sludge

    Cao, Xiuqin / Pan, Yahong / Jiang, Kun / Zhu, Kaijin / Ren, Xiaoli

    Environmental technology. 2021 Oct. 15, v. 42, no. 23

    2021  

    Abstract: The disposal processes like dewatering and anaerobic digestion (AD) are commonly utilized to reduce the volume of sludge and recover energy. Thermal hydrolysis process is widely used as a pretreatment for sludge AD, which can change rheological ... ...

    Abstract The disposal processes like dewatering and anaerobic digestion (AD) are commonly utilized to reduce the volume of sludge and recover energy. Thermal hydrolysis process is widely used as a pretreatment for sludge AD, which can change rheological properties and dehydration of sludge irreversibly. The experiment was designed to evaluate the effect of high-temperature thermal hydrolysis (120, 130, 145, 160 and 170°C) for 60 min on sludge rheological properties, as well as its dewaterability. Rheological tests were performed at (20 ± 0.1)°C with a HAAKE Viscotester 550 Rotary Viscometer. Both raw and thermal hydrolysis sludge has a considerable reduction on apparent viscosity and yield stress, but a somewhat increase in thixotropy. With the increase of temperature, the sludge flow behaviour index n increases linearly, while the consistency coefficient k follows the law of linear decline, showing that thermal hydrolysis can weaken the non-Newtonian fluid properties and then improve sludge fluidity. The dewaterability increases linearly with the temperature. Besides, the dewaterability of high-temperature thermal hydrolysis processes sludge was always significantly better than raw sludge as its mud cake has a much larger solid content. Notably, the increase in flow performance index n and the decrease of thixotropy kinetic coefficient K caused by thermal hydrolysis are all linear with the enhancement of dewaterability, which demonstrates that rheological indicators can be a new tool to evaluate the dewaterability of sludge.
    Schlagwörter anaerobic digestion ; dewatering ; energy ; environmental technology ; sludge ; temperature ; thermal hydrolysis ; viscometers ; viscosity
    Sprache Englisch
    Erscheinungsverlauf 2021-1015
    Umfang p. 3707-3715.
    Erscheinungsort Taylor & Francis
    Dokumenttyp Artikel
    ISSN 1479-487X
    DOI 10.1080/09593330.2020.1739751
    Datenquelle NAL Katalog (AGRICOLA)

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  5. Artikel: Analysis of Fluorescence and Biodegradability of Wastewater

    Zhu, Pengyu / Zhu, Kaijin / Puzey, Rob / Ren, Xiaoli

    Water, air, and soil pollution. 2019 May, v. 230, no. 5

    2019  

    Abstract: Three-dimensional fluorescence spectrometer was adopted for the content analysis of different types of organics in coking wastewater before biochemical treatment and through biochemical treatment, and the model of parallel factors was employed to analyze ...

    Abstract Three-dimensional fluorescence spectrometer was adopted for the content analysis of different types of organics in coking wastewater before biochemical treatment and through biochemical treatment, and the model of parallel factors was employed to analyze fluorescence components and contents. It was found that tryptophan-like components were the most easily degraded by biology, while humic-like components were the least easily degraded. Meanwhile, it had been seen that the change trends over time of total fluorescence densities of proteinoid fluorescence, and degradable organic fluorescence were highly consistent with that of parameter values of COD, NH3-N in this wastewater after analyzing the trends of the two indexes. It was proved that the three-dimensional fluorescence spectrum method was appropriate for the accurate degradation analysis of wastewater components.
    Schlagwörter ammonium nitrogen ; biodegradability ; chemical oxygen demand ; fluorescence ; industrial wastewater ; models ; spectrometers
    Sprache Englisch
    Erscheinungsverlauf 2019-05
    Umfang p. 108.
    Erscheinungsort Springer International Publishing
    Dokumenttyp Artikel
    ZDB-ID 120499-3
    ISSN 1573-2932 ; 0049-6979 ; 0043-1168
    ISSN (online) 1573-2932
    ISSN 0049-6979 ; 0043-1168
    DOI 10.1007/s11270-018-4064-y
    Datenquelle NAL Katalog (AGRICOLA)

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    Z 2719: Hefte anzeigen

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  6. Artikel ; Online: Effect of high-temperature thermal hydrolysis on rheological properties and dewaterability of sludge.

    Cao, Xiuqin / Pan, Yahong / Jiang, Kun / Zhu, Kaijin / Ren, Xiaoli

    Environmental technology

    2020  Band 42, Heft 23, Seite(n) 3707–3715

    Abstract: The disposal processes like dewatering and anaerobic digestion (AD) are commonly utilized to reduce the volume of sludge and recover energy. Thermal hydrolysis process is widely used as a pretreatment for sludge AD, which can change rheological ... ...

    Abstract The disposal processes like dewatering and anaerobic digestion (AD) are commonly utilized to reduce the volume of sludge and recover energy. Thermal hydrolysis process is widely used as a pretreatment for sludge AD, which can change rheological properties and dehydration of sludge irreversibly. The experiment was designed to evaluate the effect of high-temperature thermal hydrolysis (120, 130, 145, 160 and 170°C) for 60 min on sludge rheological properties, as well as its dewaterability. Rheological tests were performed at (20 ± 0.1)°C with a HAAKE Viscotester 550 Rotary Viscometer. Both raw and thermal hydrolysis sludge has a considerable reduction on apparent viscosity and yield stress, but a somewhat increase in thixotropy. With the increase of temperature, the sludge flow behaviour index n increases linearly, while the consistency coefficient
    Mesh-Begriff(e) Hydrolysis ; Rheology ; Sewage ; Temperature ; Waste Disposal, Fluid
    Chemische Substanzen Sewage
    Sprache Englisch
    Erscheinungsdatum 2020-03-15
    Erscheinungsland England
    Dokumenttyp Journal Article
    ISSN 1479-487X
    ISSN (online) 1479-487X
    DOI 10.1080/09593330.2020.1739751
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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