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Advanced treatment method for synchronously removing phosphorus and COD (Chemical Oxygen Demand) of secondary biochemical treatment effluent

A secondary biochemical effluent and advanced treatment technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., to achieve low process transformation and operation costs, low operation costs, and simple processes Effect

Inactive Publication Date: 2014-04-09
江苏立能环保水处理工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the existing secondary biochemical effluent advanced treatment methods, there is no efficient and simultaneous removal method for residual phosphorus and organic matter in the effluent; therefore, it is urgent to develop a new advanced treatment method to achieve efficient and simultaneous phosphorus removal. , In addition to the effect of COD, and make the effluent water quality meet the relevant sewage discharge standards

Method used

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  • Advanced treatment method for synchronously removing phosphorus and COD (Chemical Oxygen Demand) of secondary biochemical treatment effluent
  • Advanced treatment method for synchronously removing phosphorus and COD (Chemical Oxygen Demand) of secondary biochemical treatment effluent
  • Advanced treatment method for synchronously removing phosphorus and COD (Chemical Oxygen Demand) of secondary biochemical treatment effluent

Examples

Experimental program
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Effect test

Embodiment 1

[0025] water quality index pH Total phosphorus (mg / L) COD Cr (mg / L) TN (mg / L) Ammonia nitrogen (mg / L) Water sample to be treated 7.22 1.75 58 15.6 5.5

[0026] Take a certain amount of secondary biochemical effluent of the sewage plant and place it in the reactor, adjust the pH value to 4.5; the final dosage is 19.3mg FeSO 4 / L water sample and 4.32 mg H 2 o 2 / L water sample (ie FeSO 4 The mass ratio of the dosage to the COD content in the water sample to be treated is 1:3) Mix the two agents and react in the dark for 30 seconds; then add the agent after the mixed reaction to the water sample to be treated, and stir the reaction (at 300r / min Stir rapidly for 30 seconds, stir slowly at 80r / min for 15 minutes), settle for 120 minutes, and the supernatant is the effluent after treatment. It is detected that the total phosphorus in the water is 0.10 mg / L, and the removal rate is 94.3%; the COD is 36 mg / L, and the removal rate is 37.9%; it meet...

Embodiment 2

[0028] water quality index pH Total phosphorus (mg / L) COD Cr (mg / L) TN (mg / L) Ammonia nitrogen (mg / L) Water sample to be treated 7.41 2.31 76 16.2 6.4

[0029] Take a certain amount of secondary biochemical effluent of the sewage plant and place it in the reactor, adjust the pH value to 4.5; the final dosage is 30.4mg FeSO 4 / L water sample and 6.80 mg H 2 o 2 / L water sample (ie FeSO 4 The mass ratio of the dosage to the COD content in the water sample to be treated is 1:2.5) Mix the two agents and react in the dark for 30 seconds; then add the agent after the mixed reaction to the water sample to be treated, and stir the reaction (at 300r / min Stir rapidly for 30 seconds, stir slowly at 80r / min for 15 minutes), settle for 120 minutes, and the supernatant is the effluent after treatment. It was detected that the total phosphorus in the water was 0.12 mg / L, the removal rate was 94.8%, and the COD was 47mg / L, the removal rate was 38.2%, meeti...

Embodiment 3

[0031] Taking secondary biochemical effluent in embodiment 1 as treatment object, determine FeSO 4 The final dosage is 19.3mg / L water sample, control H 2 o 2 The final dosage is 2.16 mg / L water sample, 4.32 mg / L water sample, 6.48 mg / L water sample respectively, namely FeSO 4 and H 2 o 2 The molar ratio of dosage is 1:0.5, 1:1, 1:1.5 respectively, and other carry out 3 groups of parallel synchronous dephosphorization and COD advanced treatment experiments according to the implementation mode in Example 1, and the results are as follows:

[0032]

[0033] It can be seen from the results that when FeSO 4 and H 2 o 2 When the dosing molar ratio is 1:1, good effects on total phosphorus and COD have been achieved, and the dosage of chemicals is more economical.

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Abstract

The invention provides an advanced treatment method for synchronously removing phosphorus and COD (Chemical Oxygen Demand) of secondary biochemical treatment effluent. The method comprises the following steps of A, adjusting pH (Power of Hydrogen) of a to-be-to-treated water sample to be 4 to 5; B, mixing FeSO4 and H2O2 based on the molar ratio of 1: (0.5 to 1.5); reacting for 20 to 40 seconds under a dark condition; and adding to the water sample in step A, wherein the ratio of the amount of added FeSO4 to the mass of COD content in the water sample to be treated is 1: 2 to 3; C, sectional agitating, namely, quickly agitating for 15 to 30 seconds, slowly agitating for 10 to 15 minutes, and then precipitating for 60 to 180 minutes; and D, separating the precipitate to obtain the supernate which is the treated effluent. With the adoption of the method, the effect of synchronously removing phosphorus and COD can be realized; after the treatment, the content of phosphorus in the effluent can be greatly reduced to be less than 0.5mg / L, and the removal rate reaches more than 90%; the COD content is less than 50mg / L, and the removal rate reaches more than 35%, and the COD content and the removal rate both meet the requirements national emission-related standards on limiting value.

Description

technical field [0001] The invention belongs to the technical field of advanced treatment of sewage in environmental protection, and in particular relates to an advanced treatment method for synchronous removal of phosphorus and COD from secondary biochemical effluent. Background technique [0002] In recent years, with the rapid development of my country's national economy and the acceleration of urbanization, the problem of water environment pollution caused by large amounts of sewage discharge has become increasingly serious, and has become an important factor restricting the sustainable development of social economy. Among them, the problem of eutrophication of water bodies is particularly prominent; according to surveys, more than 80% of large lakes in my country have become eutrophic. Under certain conditions, waters polluted by eutrophication can lead to rapid reproduction of algae and other plankton, and a sharp drop in dissolved oxygen content, leading to deteriorat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 方华何磊段书芬方若雨曹惠忠高洪刚
Owner 江苏立能环保水处理工程有限公司
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