Method for controlling leakage of membrane source disinfection by-product precursor

Inactive Publication Date: 2021-11-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, most of the current research on the control of disinfection by-product precursors mainly focuses on natural organic matter in water, and there are still many gaps in the control research on membrane source precursors derived from organic membrane materials.

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  • Method for controlling leakage of membrane source disinfection by-product precursor

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Embodiment 1

[0039] The method of pretreatment of ultrafiltration membrane to control membrane source disinfection by-product precursor with the aqueous solution containing sodium hypochlorite of the present embodiment comprises the steps:

[0040]Use a phosphate buffer solution to adjust the pH value of the sodium hypochlorite solution containing an initial concentration of 3mg / L to 7.0, and then use the above sodium hypochlorite solution to filter the treatment unit through the ultrafiltration membrane to pre-filter the new ultrafiltration membrane. The pretreatment time for 1 hour, and then rinse with ultrapure water until the concentration of residual chlorine in the effluent is lower than 0.01mg / L. The material of the ultrafiltration membrane used is polyethersulfone, the molecular mass cut-off is 5000Da, and the operating pressure of the ultrafiltration treatment unit is 0.35Mpa. After the pretreatment is completed, the actual water body passes through the ultrafiltration membrane fil...

Embodiment 2

[0042] The method of pretreatment of ultrafiltration membrane to control membrane source disinfection by-product precursor with the aqueous solution containing sodium hypochlorite of the present embodiment comprises the steps:

[0043] Use phosphate buffer solution to adjust the pH value of the sodium hypochlorite solution containing an initial concentration of 4mg / L to 7.5, then use the above-mentioned sodium hypochlorite solution to pass through the ultrafiltration membrane filtration treatment unit to carry out pre-filtration treatment on the new ultrafiltration membrane, pretreatment time for 2 hours, and then rinse with ultrapure water until the concentration of residual chlorine in the effluent is lower than 0.01mg / L. The material of the ultrafiltration membrane used is polyvinylidene fluoride, the molecular mass cut-off is 50000Da, and the operating pressure of the ultrafiltration treatment unit is 0.3Mpa. After the pretreatment is completed, the actual water body passes...

Embodiment 3

[0045] The method of pretreatment of ultrafiltration membrane to control membrane source disinfection by-product precursor with the aqueous solution containing sodium hypochlorite of the present embodiment comprises the steps:

[0046] Use phosphate buffer solution to adjust the pH value of the sodium hypochlorite solution containing an initial concentration of 5mg / L to 7.0, then use the above sodium hypochlorite solution to filter the treatment unit through the ultrafiltration membrane to pre-filter the new ultrafiltration membrane, pretreatment time for 1 hour, and then rinse with ultrapure water until the concentration of residual chlorine in the effluent is lower than 0.01mg / L. The material of the ultrafiltration membrane used is polyvinylidene fluoride, the molecular mass cut-off is 10000Da, and the operating pressure of the ultrafiltration treatment unit is 0.3Mpa. After the pretreatment is completed, the actual water body passes through the ultrafiltration membrane filtr...

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Abstract

The invention discloses a method for controlling leakage of a membrane source disinfection by-product precursor. The method comprises the following steps: preparing a sodium hypochlorite solution with a concentration of 1-5 mg / L, and adjusting the pH value of the sodium hypochlorite solution to 6-8 by using a buffer salt solution; before formal filtration, carrying out pre-filtration treatment on a new ultrafiltration membrane with chlorine-containing water for 1-5 h, and then rinsing the ultrafiltration membrane with ultrapure water until the concentration of residual chlorine in filtrate is lower than a detection limit; and after the pretreatment steps, carrying out official ultrafiltration on the stock solution, and adding a disinfectant in a dark environment according to the content of soluble organic carbon in effluent to react for 24-48 hours. According to the invention, the method is short in pretreatment time, has a prominent removal effect on disinfection by-product precursors leaked by the ultrafiltration membrane, and relieves the adverse effect of membrane leakage on the effluent quality in formal filtration, so that the safety of drinking water is guaranteed, and a technical support is provided for popularization and application of a membrane separation process.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for pretreating ultrafiltration membranes with an aqueous solution containing sodium hypochlorite to control the leakage of precursors of disinfection by-products from membrane sources. Background technique [0002] The safety of drinking water is closely related to human health. In order to ensure the microbial safety of drinking water, disinfection process is essential. Due to the advantages of low price, spectrum sterilization and continuous disinfection, free chlorine is one of the most widely used disinfectants for drinking water. Since the water contains difficult-to-remove organic matter and inorganic ions, the disinfectant will also produce harmful disinfection by-products while inactivating germs. These organic and inorganic substances are collectively referred to as precursors of disinfection by-products. In order to ensure the safety of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02B01D61/20
Inventor 楚文海欧恬
Owner TONGJI UNIV
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