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Method for removing diclofenac in sewage in strengthened manner on basis of enriched nitrifying bacteria

A technology of nitrifying bacteria and diclofenac, applied in chemical instruments and methods, oxidized water/sewage treatment, sterilization/microdynamic water/sewage treatment, etc., to achieve the effects of high stability, simple equipment and strong adaptability

Active Publication Date: 2019-04-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no systematic research on the use of nitrifying bacteria to enhance the removal of micropollutants in actual sewage—diclofenac

Method used

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  • Method for removing diclofenac in sewage in strengthened manner on basis of enriched nitrifying bacteria
  • Method for removing diclofenac in sewage in strengthened manner on basis of enriched nitrifying bacteria
  • Method for removing diclofenac in sewage in strengthened manner on basis of enriched nitrifying bacteria

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method based on enriching nitrifying bacteria to strengthen the removal of diclofenac in sewage, comprising the following steps:

[0031] 1) Domesticate and enrich the nitrifying bacteria by gradually increasing the ammonia nitrogen load and gradually reducing the organic carbon load in the MBR. The enriched nitrifying bacteria are domesticated for a period of three months, and then the activated sludge is mixed with the enriched nitrifying bacteria to obtain Enrichment of domesticated nitrifying sludge;

[0032] 2) Make the sewage flow to the secondary settling tank, carry out solid-liquid separation, and separate to obtain supernatant and sediment;

[0033] 3) Pump the supernatant separated from step 1) into the MBR that enriches and domesticates the nitrification sludge. In the MBR, the concentration of the nitrification sludge is controlled to be 1000 mg / L, and the sodium bicarbonate for pH adjustment is 500 mg / L. Through real-time pH Measure and add sodium bicar...

experiment example 2

[0036] A method based on enriching nitrifying bacteria to strengthen the removal of diclofenac in sewage, comprising the following steps:

[0037] 1) Domesticate and enrich the nitrifying bacteria by gradually increasing the ammonia nitrogen load and gradually reducing the organic carbon load in the MBR. The enriched nitrifying bacteria are domesticated for a period of three months, and then the activated sludge is mixed with the enriched nitrifying bacteria to obtain Enrichment of domesticated nitrifying sludge;

[0038] 2) Make the sewage flow to the secondary settling tank, carry out solid-liquid separation, and separate to obtain supernatant and sediment;

[0039]3) Pump the supernatant separated from step 1) into the MBR that enriches and domesticates the nitrification sludge. In the MBR, the concentration of the nitrification sludge is controlled to be 1000 mg / L, and the sodium bicarbonate for pH adjustment is 500 mg / L. Through real-time pH Measure and add sodium bicarb...

Embodiment 3

[0042] A method based on enriching nitrifying bacteria to strengthen the removal of diclofenac in sewage, comprising the following steps:

[0043] 1) Domesticate and enrich the nitrifying bacteria by gradually increasing the ammonia nitrogen load and gradually reducing the organic carbon load in the MBR. The enriched nitrifying bacteria are domesticated for a period of three months, and then the activated sludge is mixed with the enriched nitrifying bacteria to obtain Enrichment of domesticated nitrifying sludge;

[0044] 2) Make the sewage flow to the secondary settling tank, carry out solid-liquid separation, and separate to obtain supernatant and sediment;

[0045] 3) Pump the supernatant separated from step 1) into the MBR that enriches and domesticates the nitrification sludge. In the MBR, the concentration of the nitrification sludge is controlled to be 1000 mg / L, and the sodium bicarbonate for pH adjustment is 500 mg / L. Through real-time pH Measure and add sodium bicar...

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Abstract

The invention discloses a method for removing diclofenac in sewage in a strengthened manner on the basis of enriched nitrifying bacteria. The method includes steps of 1), domesticating and enriching the nitrifying bacteria to obtain enriched and domesticated nitrifying sludge; 2), allowing the sewage to automatically flow into secondary sedimentation tanks and carrying out solid-liquid separation;3), carrying out sewage treatment on the enriched and domesticated nitrifying sludge in MBR (membrane bioreactor) devices; 4), analyzing treatment results for effluent. The method has the advantagesof simple equipment, simplicity and convenience in operation, low cost and the like. Besides, the method is free of pollution and high in stability; the diclofenac in the sewage can be effectively removed by the aid of the method, accordingly, the requirements on sewage discharge can be met, environmental pollution can be prevented, and economic treatment effects can be realized; the shortcomingsof existing purification processes can be overcome by the aid of the method, the shortcomings of poor diclofenac removal effects and instable operation in the prior art can be overcome by the aid of the method, and gap of domestic and overseas related technologies for removing diclofenac in water sources can be filled.

Description

technical field [0001] The invention belongs to the technical field of sewage purification, and in particular relates to a method for strengthening the removal of diclofenac in sewage based on the enrichment of nitrifying bacteria. Background technique [0002] Diclofenac is a non-steroidal anti-inflammatory drug widely used in anti-inflammatory and analgesic. Due to its wide use and persistence, it has been detected in large quantities in environmental water bodies. Sewage treatment plants are used as the gathering place for it to enter various types of water been widely concerned. As a new type of pollutant, there are few studies on its ecological and environmental risks. Existing studies have shown that diclofenac can cause a large decline in Indian condors. Therefore, how to effectively remove diclofenac in sewage treatment systems has attracted people's attention. [0003] The sewage treatment process is an important link to ensure the safe discharge of sewage, so it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/38C02F101/36C02F101/34
CPCC02F9/00C02F3/34C02F3/1268C02F2101/38C02F2101/36C02F2101/34C02F2303/14C02F2209/06C02F2209/22C02F2209/14C02F2209/16C02F2203/004C02F1/76C02F1/52C02F1/50Y02W10/10
Inventor 耿金菊吴刚任洪强许柯
Owner NANJING UNIV
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