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

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

Active Publication Date: 2017-05-31
NANJING UNIV
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  • 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.

Method used

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  • Method for detecting dissolved organic nitrogen concentration in sewage based on dialysis pretreatment
  • Method for detecting dissolved organic nitrogen concentration in sewage based on dialysis pretreatment

Examples

Experimental program
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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 dissolved organic nitrogen concentration in sewage based on dialysis pretreatment and belongs to the technical field of sewage treatment. The method disclosed by the invention comprises the following steps: 1) filtering a sewage sample; 2) respectively measuring concentrations of total dissolved nitrogen (TDN), ammonia nitrogen (NH4<+>) and nitrate nitrogen (NO3<->) in sewage treated in the step 1); 3) selecting one of a measurement scheme I, a measurement scheme II and a measurement scheme III according to a ratio of (NH4<+>+NO3<->) to TDN and a ratio of NO3<-> to NH4<+>; and 4) calculating the dissolved organic nitrogen concentration in the sewage according to the numerical value obtained in the measurement scheme selected in the step 3). The method for detecting the dissolved organic nitrogen concentration in sewage provided by the invention does not need a preliminary experiment, is simple and convenient in operation and low in cost and can be widely applied to measurement of the dissolved organic nitrogen concentration in the 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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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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