Comprehensive evaluation method of performances of waste flat sheet membrane

A flat membrane, waste technology, applied in the field of sewage and waste recycling, can solve the problems of the difficulty, cost and carbon emission of the cleaning process without considering the cleaning process, and achieve the effect of strong objectivity

Active Publication Date: 2016-02-03
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It is generally believed that the basis for evaluating whether a membrane module can continue to be used or discarded is mainly the membrane flux recovery rate, that is, through various off-line chemical cleaning, if the membrane flux recovery rate is above 80%, it can continue to be used. Whether the physical and chemical properties such as tensile strength and maximum pore size of the cleaning membrane can meet the requirements of use, and whether the difficulty, cost and carbon emission (carbon footprint) of the cleaning process are reasonable

Method used

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  • Comprehensive evaluation method of performances of waste flat sheet membrane
  • Comprehensive evaluation method of performances of waste flat sheet membrane
  • Comprehensive evaluation method of performances of waste flat sheet membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0042]The PVDF-contaminated flat membrane in the municipal sewage treatment membrane bioreactor was analyzed by EDX, and the membrane surface element composition was: carbon 19.47%, nitrogen 3.62%, oxygen 29.00%, phosphorus 11.24%, calcium 1.45%, iron 27.28%, aluminum 1.44% , compared with the control group, it can be seen that the fouled membrane belongs to the type of inorganic pollution. The polluted membrane was cleaned with 1.0% oxalic acid for 3 hours, and then with 0.3% sodium hypochlorite for 3 hours to obtain a membrane sample. The tensile strength of the obtained membrane sample is 20.5MPa, and the membrane flux is 1930L / (m 2 h), the carbon footprint is 47g, compared with the control group, it is determined that the polluted membrane is an old membrane. Return to the original sewage treatment project and continue to use. The results show that the effluent water quality of the system has not changed significantly, the monthly membrane flux decay rate is 3%, and the c...

Embodiment 2

[0044] The PVDF polluted flat membrane in the municipal sewage treatment membrane bioreactor was analyzed by EDX, and the membrane surface element composition was: carbon 65.63%, nitrogen 9.37%, oxygen 20.58%, fluorine 35.74%, iron 1.87%, aluminum 0.44%, and the control group It can be seen from the comparison that the polluted membrane belongs to organic pollution type. The polluted membrane was washed with 1.0% sodium hypochlorite for 2 hours, and then washed with 1.0% citric acid for 1 hour to obtain a membrane sample. The tensile strength of the obtained membrane sample is 18.5MPa, and the membrane flux is 2100L / (m 2 h), the carbon footprint is 24g, compared with the control group, it is determined that the polluted membrane is an old membrane. Return to the original sewage treatment project and continue to use. The results show that the effluent water quality of the system has not changed significantly, the monthly membrane flux decay rate is 3%, and the chemical cleanin...

Embodiment 3

[0046] The PVDF-contaminated flat membrane in the hospital sewage treatment membrane bioreactor was analyzed by EDX, and the membrane surface element composition was: carbon 53.99%, nitrogen 15.73%, fluorine 23.76%, silicon 3.22%, magnesium 2.14%, calcium 0.55%, aluminum 0.61% , compared with the control group, it can be seen that the polluted membrane belongs to organic pollution type. The polluted membrane was washed with 5% sodium hypochlorite for 2 hours, and then washed with 0.1% oxalic acid for 4 hours to obtain a membrane sample. The tensile strength of the obtained membrane sample is 21.2MPa, and the membrane flux is 1890L / (m 2 h), the carbon footprint is 39g, compared with the control group, it is determined that the polluted membrane is an old membrane. Return to the original sewage treatment project and continue to use. The results show that the effluent water quality of the system has not changed significantly, the monthly membrane flux decay rate is 3%, and the c...

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Abstract

The invention discloses a comprehensive evaluation method of performances of a waste flat sheet membrane and belongs to the technical field of sewage and waste recycling. The method comprises the following steps: analyzing surface elements by using an energy dispersion X-ray spectrum (EDX) and identifying whether an organic pollution type or an inorganic pollution type exists or not; obtaining a membrane sample to be detected by using a corresponding chemical washing method, wherein evaluation standards are that when the tensile strength of the membrane to be detected is reduced by 50 percent and above when being compared with that of a control group, the membrane is a waste membrane; when the tensile strength of the membrane to be detected is reduced by within 50 percent when being compared with that of the control group and when a membrane flux of the membrane to be detected is reduced by 30 percent and above when being compared with that of the control group, the membrane is the waste membrane; when the membrane flux of the membrane to be detected is reduced by within 30 percent when being compared with that of the control group and a carbon track is higher than 188g, the membrane is a waste membrane; otherwise, the membrane is an old membrane. The evaluation method provided by the invention can be used for quantitatively, rapidly and comprehensively defining difference between the old membrane and the waste membrane, and provides evidences for destinations of the waste and old membranes and the selection of a regeneration and recycling process.

Description

technical field [0001] The invention relates to a comprehensive evaluation method for the performance of waste flat membranes, belonging to the technical field of sewage and waste recycling. Background technique [0002] According to statistics, more than 300 membrane bioreactor (MBR) sewage treatment projects have been put into operation or under construction in my country, of which nearly 10 are MBR systems with a 10,000-ton level. In the field of sewage treatment membrane technology applications, my country has become the world's fastest growing One of the fastest areas. MBR introduces membrane separation technology into the traditional activated sludge system and replaces the secondary settling tank. Since the membrane can achieve solid-liquid separation and interception of macromolecular organic matter, it shows advantages that traditional activated sludge methods do not have. From the late 1970s to the present, the MBR process has gradually been recognized in the field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/10C02F3/12
CPCB01D61/20B01D65/02C02F3/1268B01D2321/162B01D2321/168B01D2321/40C02F2303/16Y02W10/10B01D2313/903B01D71/301B01D65/10B01D69/06B01D71/34C02F3/2853
Inventor 李秀芬宋小莉王新华任月萍
Owner JIANGNAN UNIV
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