Method for detecting concentration of soluble organic nitrogen in sewage based on dialysis pretreatment

Method for detecting concentration of soluble organic nitrogen in sewage based on dialysis pretreatment

  • CN 106,769,946 B
  • Filed: 01/20/2017
  • Issued: 08/07/2020
  • Est. Priority Date: 01/20/2017
  • Status: Active Grant
First Claim
Patent Images

1. A method for detecting the concentration of soluble organic nitrogen in sewage based on dialysis pretreatment comprises the following steps:

  • (1) filtering the sewage sample by using a filter membrane;

    (2) respectively measuring the concentrations of the soluble total nitrogen, ammonia nitrogen and nitrate nitrogen of the sewage treated by the step (1), and respectively recording as CTDN(Ⅰ

    )


    CNH4+(Ⅰ

    )
    And CNO3-(Ⅰ

    )


    (3) Judgment (C)NH4+(Ⅰ

    )
    +CNO3-(Ⅰ

    )
    )/CTDN(Ⅰ

    )
    Ratio to size of 0.7 and CNO3-(Ⅰ

    )
    /CNH4+(Ⅰ

    )
    Selecting one of assay protocol I, assay protocol II and assay protocol III from the ratio and the size of 1;

    assay protocol I;

    when (C)NH4+(Ⅰ

    )
    +CNO3-(Ⅰ

    )
    )/CTDN(Ⅰ

    )
    <

    At 0.7, the concentration of nitrite nitrogen in the sewage is directly measured without pretreatment and is marked as CNO2-(Ⅰ

    )


    Assay protocol II;

    when (C)NH4+(Ⅰ

    )
    +CNO3-(Ⅰ

    )
    )/CTDN(Ⅰ

    )
    Not less than 0.7 and CNO3-(Ⅰ

    )
    /CNH4+(Ⅰ

    )
    When the concentration of the wastewater is more than or equal to 1, putting the wastewater into a suspension dialysis bag for dialysis pretreatment, wherein the dialysis time is 22-26 h;

    TDN and NH in the sewage are respectively measured after dialysis4+

    NO3-And NO2-Respectively, is marked as CTDN(Ⅱ

    )


    CNH4+(Ⅱ

    )


    CNO3-(Ⅱ

    )
    And CNO2-(Ⅱ

    )


    Assay protocol III;

    when (C)NH4+(Ⅰ

    )
    +CNO3-(Ⅰ

    )
    )/CTDN(Ⅰ

    )
    Not less than 0.7 and CNO3-(Ⅰ

    )
    /CNH4+(Ⅰ

    )
    <

    1, putting the sewage into a suspension dialysis bag for dialysis pretreatment, wherein the dialysis time is 34-38 h;

    dialysis nodeSeparately measuring TDN and NH in sewage after beam4+

    NO3-And NO2-Respectively, is marked as CTDN(Ⅲ

    )


    CNH4+(Ⅲ

    )


    CNO3-(Ⅲ

    )
    And CNO2-(Ⅲ

    )


    (4) And (4) calculating the concentration of the soluble organic nitrogen in the sewage according to the numerical value obtained by the measuring scheme selected in the step (3).

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