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A detection method of dissolved organic nitrogen concentration in sewage based on dialysis pretreatment

A dissolved organic nitrogen and concentration detection technology, applied in chemical instruments and methods, color/spectral characteristic measurement, dialysis, etc., can solve the problems of high energy consumption, large errors, and many uncertain factors, and achieve low energy consumption, The effect of reducing deviation and reducing the concentration of inorganic nitrogen

Active Publication Date: 2020-08-07
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at problems such as large error, large energy consumption and many uncertain factors in the existing determination method of dissolved organic nitrogen (ie DON) in sewage, the present invention provides a DON concentration detection method based on dialysis pretreatment. (C NH4 + (Ⅰ) +C NO3 - (Ⅰ) ) / C TDN(Ⅰ) Ratio and C NO3 - (Ⅰ) / C NH4 + (Ⅰ) Ratio, choose different measurement schemes, has the advantages of low energy consumption, easy operation, etc.

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  • A detection method of dissolved organic nitrogen concentration in sewage based on dialysis pretreatment
  • A detection method of dissolved organic nitrogen concentration in sewage based on dialysis pretreatment

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 1. Take 100mL of effluent from a municipal sewage treatment plant in Nanjing (denoted as sample 1), and filter the sewage sample with a filter membrane with a pore size of 0.45 μm.

[0034] 2. Adopt potassium persulfate oxidation-ion chromatography, salicylic acid-hypochlorite photometry and ion chromatography to measure TDN, NH of the sewage treated through step 1 respectively 4 + and NO 3 - concentration, denoted as C TDN(Ⅰ) 、C NH4 + (Ⅰ) and C NO3 - (Ⅰ) .

[0035] 3. (C NH4 + (Ⅰ) +C NO3 - (Ⅰ) ) / C TDN(Ⅰ) =0.92>0.7, C NO3 - (Ⅰ) / C NH4 + (Ⅰ) >1, using Assay Protocol II. Put the sewage into the suspended dialysis bag for dialysis pretreatment, and the dialysis time is 24h. Suspension dialysis bags are made of cellulose ester membrane, which is hydrophilic and has a cut molecular weight of 100Da. The hydraulic retention time of the dialysate was 4 hours. After dialysis, potassium persulfate oxidation-ion chromatography, salicylic acid-hypochlorite...

Embodiment 2

[0038] 1. Take 100mL of sewage from the anaerobic section of a municipal sewage treatment plant in Nanjing (denoted as sample 2). Sewage samples were filtered with a filter membrane with a pore size of 0.45 μm.

[0039] 2. Adopt potassium persulfate oxidation-ion chromatography, salicylic acid-hypochlorite photometry and ion chromatography to measure TDN, NH of the sewage treated through step 1 respectively 4 + and NO 3 - concentration, denoted as C TDN(Ⅰ) 、C NH4+(Ⅰ) and C NO3-(Ⅰ) .

[0040] 3. (C NH4 + (Ⅰ) +C NO3 - (Ⅰ) ) / C TDN(Ⅰ) =0.73>0.7, C NO3 - (Ⅰ) / C NH4 + (Ⅰ) 4 + , NO 3 - and NO 2 - concentration, denoted as C TDN(Ⅲ) 、C NH4 + (Ⅲ) 、C NO3 - (Ⅲ) and C NO2 - (Ⅲ) .

[0041] 4. The concentration of DON is determined by the formula DON=C TDN(Ⅲ) -C NH4 + (Ⅲ) -C NO3 - (Ⅲ) -C NO2 - (Ⅲ) calculated. The DON concentration of sample 2 was 2.43 mg / L. In order to improve the accuracy and reliability of determination, the present embodiment...

Embodiment 3

[0043] 1. Take 100mL of sewage from the aerobic section of a municipal sewage treatment plant in Nanjing (denoted as sample 3). Sewage samples were filtered with a filter membrane with a pore size of 0.45 μm.

[0044] 2. Adopt potassium persulfate oxidation-ion chromatography, salicylic acid-hypochlorite photometry and ion chromatography to measure TDN, NH of the sewage treated through step 1 respectively 4 + and NO 3 - concentration, denoted as C TDN(Ⅰ) 、C NH4 + (Ⅰ) and C NO3 - (Ⅰ) .

[0045] 3. (C NH4 + (Ⅰ) +C NO3 - (Ⅰ) ) / C TDN(Ⅰ) =0.75>0.7, C NO3 - (Ⅰ) / C NH4 + (Ⅰ) >1, using Assay Protocol II. Put the sewage into the suspended dialysis bag for dialysis pretreatment, and the dialysis time is 24h. Suspension dialysis bags are made of cellulose ester membrane, which is hydrophilic and has a cut molecular weight of 100Da. The hydraulic retention time of the dialysate was 4 hours. After dialysis, potassium persulfate oxidation-ion chromatography, salic...

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Abstract

The invention discloses a method for detecting the concentration of dissolved organic nitrogen in sewage based on dialysis pretreatment, and belongs to the technical field of sewage treatment. The present invention comprises the following steps: 1) filter the sewage sample; 2) measure the soluble total nitrogen (TDN), ammonia nitrogen (NH 4 + ) and nitrate nitrogen (NO 3 ‑ ) concentration; 3) according to (NH 4 + +NO 3 ‑ ) / TDN ratio and NO 3 ‑ / NH 4 + For the ratio, select one of the measurement scheme I, the measurement scheme II and the measurement scheme III; 4) calculate the sewage dissolved organic nitrogen concentration according to the value obtained by the measurement scheme selected in step 3). The method for detecting the concentration of dissolved organic nitrogen in sewage provided by the invention does not need a pre-test, has simple operation and low cost, and can be widely used in the determination of the concentration of dissolved organic nitrogen in sewage.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to a method for detecting the concentration of dissolved organic nitrogen in sewage based on dialysis pretreatment. Background technique [0002] Sewage dissolved total nitrogen (TDN) includes inorganic nitrogen (DIN, including ammonia nitrogen, nitrate nitrogen and nitrite nitrogen) and dissolved organic nitrogen (DON). Many sewage treatment plants have a denitrification process, and most of the inorganic nitrogen is successfully removed through nitrification-denitrification. In contrast, DON is difficult to remove during the nitrification-denitrification process, and the final effluent DON can account for 80% of the effluent TDN above. Sewage DON has a certain amount of bioavailable fraction, which can become nutrients for the growth of microorganisms and algae in rivers. In addition, DON is an important precursor of highly mutagenic and highly carcinoge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N1/34
CPCG01N1/34G01N21/31B01D61/243B01D2325/02834B01D61/32B01D63/089B01D69/061G01N21/77B01D71/16G01N2021/775B01D2325/36B01D2325/20B01D61/28
Inventor 任洪强胡海冬耿金菊丁丽丽黄辉
Owner NANJING UNIV
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