Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for treating metallurgical wastewater by membrane integration

A technology of membrane integration and wastewater, applied in metallurgical wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., to achieve the effects of reduced emissions, simple process flow, and low energy consumption

Inactive Publication Date: 2019-02-22
LANZHOU UNIVERSITY OF TECHNOLOGY
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the case that the existing single treatment technology for metallurgical wastewater cannot treat wastewater efficiently, energy-saving, and environmentally friendly, the coupling process of membrane technology with low cost and low energy consumption will be an inevitable trend

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for treating metallurgical wastewater by membrane integration
  • Method for treating metallurgical wastewater by membrane integration
  • Method for treating metallurgical wastewater by membrane integration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Pretreatment

[0041] Send the untreated metallurgical wastewater into the reaction tank, where NaHCO 3 3.15 tons of NaOH with a mass fraction of 20% is added to the reaction tank every hour. After the reaction is complete, continue to add NaOH to adjust the pH of the wastewater to 9~10;

[0042] (2) Ultrafiltration

[0043] The PH-adjusted wastewater is sent to the ultrafiltration system for ultrafiltration treatment, and the large particles of impurities are intercepted to obtain the ultrafiltration permeate;

[0044] (3) Nanofiltration

[0045] The nanofiltration membrane module can be commonly used in the market, and the D series produced by GE is preferred. The obtained ultrafiltration permeate enters the nanofiltration membrane module through the booster pump at 3.5Mpa, the temperature of the feed liquid is 25°C, after the wastewater passes through the nanofiltration system, the CO in the nanofiltration permeate 3 2- and SO 4 2- The total content is les...

Embodiment 2

[0059] (1) Pretreatment

[0060] Send the untreated metallurgical wastewater into the reaction tank, where NaHCO 3 Based on the amount of water, add 2.52t of NaOH with a mass fraction of 25% to the reaction tank every hour. After fully reacting, continue to add NaOH to adjust the pH of the wastewater to 9~10;

[0061] (2) Ultrafiltration

[0062] The PH-adjusted wastewater is sent to the ultrafiltration system for ultrafiltration treatment, and the large particles of impurities are intercepted to obtain the ultrafiltration permeate;

[0063] (3) Nanofiltration

[0064] The nanofiltration membrane module can be commonly used in the market, and the D series produced by GE is preferred. The obtained ultrafiltration permeate enters the nanofiltration membrane module through the booster pump at 3.5Mpa, the temperature of the feed liquid is 25°C, after the wastewater passes through the nanofiltration system, the CO in the nanofiltration permeate 3 2- and SO 4 2- The total con...

Embodiment 3

[0078] (1) Pretreatment

[0079] Send the untreated metallurgical wastewater into the reaction tank, where NaHCO 3 Based on the amount, add 2.1t of NaOH with a mass fraction of 30% to the reaction tank every hour. After the reaction is complete, continue to add NaOH to adjust the pH of the wastewater to 9~10;

[0080] (2) Ultrafiltration

[0081] The PH-adjusted wastewater is sent to the ultrafiltration system for ultrafiltration treatment, and the large particles of impurities are intercepted to obtain the ultrafiltration permeate;

[0082] (3) Nanofiltration

[0083] The nanofiltration membrane module can be commonly used in the market, and the D series produced by GE is preferred. The obtained ultrafiltration permeate enters the nanofiltration membrane module through a booster pump at 3.5Mpa. The temperature of the feed liquid is 25°C. After the wastewater passes through the nanofiltration system, the CO in the nanofiltration permeate 3 2- and SO 4 2- The total content...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for treating metallurgical wastewater by membrane integration. The method comprises the following steps: NaOH is added to the metallurgical wastewater to ensure that HCO<3-> in waste liquor is completely converted into CO3<2->, the waste liquor is sent into an ultrafiltration system and a nanofiltration system for treatment sequentially, a nanofiltration concentrated solution is sent into a reverse osmosis system, reverse osmosis permeate is collected to be recycled, CO2 or waste flue gas is introduced into the obtained reverse osmosis concentrated solution, after full reaction, the concentrated solution is sent into a heating evaporation section for heating evaporation treatment, so that NaHCO3 crystals are precipitated and centrifugally separated, solid NaHCO3 is collected, separated mother liquor is continuously heated and crystallized, and Na2SO4 and a small amount of Na2CO3 are obtained; a certain amount of sodium chloride is directly added to thenanofiltration permeate to prepare caustic soda. Zero emission and low energy consumption of chemical production as well as recycling of waste are achieved. The method has simple process and low energy consumption, and metallurgical wastewater produced by chemical plants can be economically and effectively treated.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for treating metallurgical wastewater by a membrane integration process. Background technique [0002] Traditional wastewater treatment technologies commonly used in industry include evaporation crystallization, biological methods, and membrane separation technologies. Evaporation crystallization includes natural evaporation, multi-effect evaporation and mechanical evaporation; although natural evaporation has low energy consumption, due to the unsatisfactory solar evaporation efficiency, the water inflow is greater than the evaporation amount, the area is large, and it is seriously affected by natural factors. Efficient evaporation connects multiple evaporators in series, and uses the secondary steam generated by the previous evaporator to heat the next evaporator. Compared with natural evaporation, it has the advantages of low energy consumption and small footprint,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D5/00C01D1/04C02F103/16
CPCC01D1/04C01D5/00C02F9/00C02F2103/16C02F1/38C02F1/04C02F1/441C02F1/444C02F1/442Y02P20/10
Inventor 张栋强陈彦安苏娜赵静李贵贤杨平苏鑫
Owner LANZHOU UNIVERSITY OF TECHNOLOGY