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Cleaning agent and cleaning method of plate nano-filtration membrane for treating reverse osmosis concentrated water

A technology of reverse osmosis concentrated water and cleaning agent, applied in the field of cleaning agent, can solve problems such as permeability hazards of nanofiltration membranes

Inactive Publication Date: 2019-09-10
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also emerging pollutants such as endocrine disruptors and environmental priority control pollutants in DOM. The existence of such substances has great harm to the permeability of nanofiltration membranes.

Method used

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  • Cleaning agent and cleaning method of plate nano-filtration membrane for treating reverse osmosis concentrated water
  • Cleaning agent and cleaning method of plate nano-filtration membrane for treating reverse osmosis concentrated water
  • Cleaning agent and cleaning method of plate nano-filtration membrane for treating reverse osmosis concentrated water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The main indicators of ROC to be treated: COD value is 268mg / L, pH value is 7.8, TDS value is 3400mg / L, Cl - The concentration is 870 mg / L, SO 4 2- The concentration is 1410 mg / L, Mg 2+ The concentration is 63mg / L, Na + The concentration is 737mg / L, Ca 2+ The concentration is 320mg / L. The operating pressure of the nanofiltration process is 0.8MPa, and the operating temperature is controlled at about 24°C. Four identical NF90 nanofiltration membranes are used to treat ROC for 12 hours for membrane cleaning experiments.

[0027]When chemically cleaning the polluted NF90 membrane in reverse osmosis concentrated water, one of the four nanofiltration membranes to be cleaned was first selected for experimentation. Control the cleaning conditions as follows: control the temperature of the constant temperature bath (1) to 35±2°C, adjust the bypass valve (4) and control the pressure gauge (5) to stabilize the pressure at 0.3MPa. First wash with pH=12 sodium hydroxide solut...

Embodiment 2

[0034] Embodiment 2: this cleaning is different from Example 1 in that the flat nanofiltration membrane selected in the experiment is the DK membrane produced by GE Company in the United States, and the membrane flux recovery rate of the DK membrane after four kinds of combined cleaning methods are all greater than 97%. %.

Embodiment 3

[0035] Embodiment 3: this cleaning is different from embodiment 1 or embodiment 2 in that the flat nanofiltration membrane selected in the experiment is the NT101 membrane produced by the German MADIR company, and the membrane flux recovery of the NT101 membrane after four kinds of combined cleaning methods are used to clean Rates are greater than 95%.

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Abstract

The invention discloses a cleaning agent and a cleaning method for a plate nano-filtration membrane for treating reverse osmosis concentrated water. The cleaning agent comprises an acidic cleaning agent, an alkaline cleaning agent, an oxidizing agent, a chelating agent, and a surfactant. A cleaning process consists of cleaning with a single cleaning agent and combined cleaning with two cleaning agents, and the combined cleaning uses a combination sequence of cleaning organic contamination + cleaning inorganic contamination. A cleaning method of low-pressure high-speed flow circulation flushingis adopted. The method has low operating pressure, simple operation and short cleaning time, recovery of a membrane flux can be realized to the greatest extent, and cross-contamination between cleaning agents is avoided. By comparing scanning electron microscopy (SEM) images of different nano-filtration membranes, results show that the combined cleaning method can efficiently remove organic gel layers and inorganic scaling layers on the nano-filtration membranes, recycling of the nano-filtration membranes can be realized, and thus the cleaning agent has good application values and prospects.

Description

technical field [0001] The invention belongs to the field of advanced treatment of industrial wastewater nanofiltration membranes, and in particular relates to a cleaning agent and a cleaning method used for effective chemical cleaning of flat nanofiltration membranes for treating contaminated reverse osmosis concentrated water in oil refineries. Background technique [0002] Oil refinery wastewater has the characteristics of high pollutant content, complex composition, high toxicity, and high salt content. The oil refinery wastewater treated by secondary biochemical treatment equipment is further treated by reverse osmosis (RO) system. (ROC) is further concentrated. ROC contains fungicides and scale inhibitors used in membrane process maintenance. Generally speaking, it mainly contains two types of substances: dissolved organic matter (DOM) and inorganic salt ions. DOM includes organic substances such as fluoride, phenol, organophosphorus, naphthalene series and nitro compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06B01D61/02
CPCB01D61/027B01D65/02B01D2321/162B01D2321/164
Inventor 卢杰李娜王晓焱宋万超张惠丁金成
Owner SHANDONG UNIV OF TECH