Cleaning method of reverse osmosis membrane of steel recycled water membran method desalting system

A technology of reverse osmosis membrane and reclaimed water, which is used in the cleaning of reverse osmosis membrane of steel reclaimed water desalination system and the cleaning of reverse osmosis membrane of iron and steel reclaimed water membrane desalination system, which can solve the pollution of reverse osmosis membrane and the long cleaning cycle. and other problems, to achieve the effect of water flux and pressure difference recovery, and less drug consumption

Active Publication Date: 2009-12-09
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for cleaning the reverse osmosis membrane of the water film desalination system in iron and steel, which overcomes the long cleaning p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A steel company mixed smelting, steel rolling wastewater and the remaining about 24% of domestic sewage to produce comprehensive steel wastewater through coarse screen-fine screen-lime softening-high-density clarification tank-pH adjustment-V-shaped filter tank-injection After adding NaClO for disinfection, the suspended solids are less than 20mg / L, COD Cr Iron and steel water with less than 30mg / L, mineral oil less than 3mg / L, temporary hardness less than 100mg / L, residual chlorine 0.5mg / L, then choose quartz sand as filter material and add 3-10mg / L FeCl 3 (Ferric chloride) is subjected to micro-flocculation filtration, and then processed by a laminated filter with a filtration accuracy of 55 μm. The pretreated water is firstly treated by an internal pressure ultrafiltration device to meet the requirement of SDI≤2, and then passed through a precision filter with a precision of 5 μm, boosted by a high-pressure pump, and then enters a reverse osmosis device for desalinat...

Embodiment 2

[0024] A steel company prepared wastewater from smelting and rolling steel through coarse screen-fine screen-lime softening-clarification-filtration-dosing NaClO disinfection treatment, and then prepared it into reclaimed steel water, which was treated by a microfiltration device, and then passed through a precision filter with an accuracy of 5 μm. After the filter is boosted by a high-pressure pump, it enters the reverse osmosis device for desalination treatment. The company uses regular and automatic dosing of acidic cleaning solution during the operation of the membrane desalination system to remove calcium bicarbonate, magnesium bicarbonate scale, aluminate or aluminum hydroxide flocs, metal oxides, microorganisms, and then use reverse osmosis to produce water Rinse quickly; or add alkaline cleaning solution to clean organic matter, silica, aluminum sulfate or aluminum chloride polymer, calcium, magnesium, iron, aluminum ions and other pollutants on the reverse osmosis memb...

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Abstract

The invention is a cleaning method of reverse osmosis membrane of a steel recycled water membran method desalting system, belonging to the technical field of steel recycled water desalting. The method comprises the following steps: automatically adding alkaline washing liquid in a running membran method desalting system to wash the organism, silicon dioxide, polymer of aluminum sulfate or aluminum chloride and pollutant of calcium, magnesium, iron, aluminum ion and the like on the reverse osmosis membrane at regular time, then washing rapidly by reverse osmosis producing water; or adding acid washing liquid to clear up calcium bicarbonate, magnesium bicarbonate incrustation, aluminate or aluminium hydroxide floc, metallic oxide and microorganism, then washing rapidly by the reverse osmosis producing water. One time washing is carried out when the desalting system runs 6-24h, and acid washing and alkali washing are carried out alternately. The method provided by the invention has the advantages that the reverse osmosis water flux and differential pressure can be restored without affecting production with less drug consumption, convenience and effectiveness, due to the short washing time in each time.

Description

technical field [0001] The invention belongs to the technical field of water desalination in iron and steel, in particular to a method for cleaning the reverse osmosis membrane of the water membrane desalination system in iron and steel. Cleaning of reverse osmosis membranes in salt water desalination systems for steel. Background technique [0002] Sewage reuse is an important way for iron and steel enterprises to achieve "water saving and emission reduction". At present, most domestic iron and steel companies use lime softening-clarification-filtration-disinfection process for comprehensive sewage (production wastewater containing no more than 30% of domestic sewage) to meet the requirements of reuse water (or called steel water) and desalination by membrane method Reuse. [0003] Since fluorite containing fluorine is generally added in the process of ironmaking and steelmaking, part of the fluorine enters the sewage. In order to remove fluoride ions in steel sewage, al...

Claims

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Application Information

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IPC IPC(8): B01D65/02B01D65/06C02F1/44
CPCY02A20/131
Inventor 张建红刘正发王元葵徐明林小利李金辉李蔚然吴立婷
Owner SHOUGANG CORPORATION
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