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Deep treatment process of metallurgical sewage

A technology for advanced treatment of sewage, which is applied in the field of advanced treatment of metallurgical sewage to reduce COD. It can solve the problems of high one-time investment in process equipment, large fluctuations in water quality indicators, and low membrane flux, achieving significant economic benefits and reducing chemical cleaning. The number of times, the effect of reducing COD

Inactive Publication Date: 2007-11-07
HEBEI IRON AND STEEL
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AI Technical Summary

Problems solved by technology

The problems of this process are: 1. Due to the complex water quality components of metallurgical industrial sewage, the water quality index fluctuates greatly, among which the COD content is 100---120mg / l, the salt content, hardness, and high-valent ion content are all high. The presence of ultrafiltration has a certain impact on the operation of the reverse osmosis system, while the removal rate of ultrafiltration for COD does not exceed 20%, and has no effect on the removal of high-priced ions
2. The process pretreatment system adopts negative pressure immersion ultrafiltration, the membrane flux is small, and the one-time investment of process equipment is high
3. Due to the requirements of the process conditions, the membrane filaments of the ultrafiltration system need to be continuously blown, aerated and vacuumed, resulting in high energy consumption during operation

Method used

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  • Deep treatment process of metallurgical sewage
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Examples

Experimental program
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Effect test

Embodiment 1

[0041] A. Recycling sewage and producing reclaimed water: collecting and extracting sewer sewage from the metallurgical industry through flocculation and sedimentation to meet the reclaimed water requirement that the effluent suspended matter is less than 100mg / l.

[0042] B. Treatment of reclaimed water to reduce the content of COD and high-valent ions: introduce the above reclaimed water into the clarification tank, according to the water quality, the COD of metallurgical wastewater is 108mg / l, put in lime milk at 100mg / l, and put in powdered activated carbon, lime milk and 20mg / l Powdered activated carbon adopts a complete set of dosing devices including dry speculation, dissolution tank, metering pump and matching pipes and valves. Through the mixing, reaction, flocculation, precipitation, clarification, separation, adsorption, and filtration of clarifiers, valveless filters, and multi-media filters, some suspended solids, colloidal substances, organic substances, oils, alk...

Embodiment 2

[0046] A. Recycling sewage and producing reclaimed water: collecting and extracting sewer sewage from the metallurgical industry through flocculation and sedimentation to meet the reclaimed water requirement that the effluent suspended matter is less than 100mg / l.

[0047] B. Reclaimed water treatment to reduce COD and high-valent ion content: introduce the above reclaimed water into the clarification tank, and according to the water quality, when the COD of metallurgical wastewater is 120mg / l, put lime milk at 150mg / l, powdered activated carbon and lime milk at 30mg / l A complete set of dosing devices are used with powdered activated carbon, including dry speculation, dissolution tank, metering pump and matching pipes and valves. Through the mixing, reaction, flocculation, precipitation, clarification, separation, adsorption, and filtration of clarifiers, valveless filters, and multi-media filters, some suspended solids, colloidal substances, organic substances, oils, alkalinit...

Embodiment 3

[0051] A. Recycling sewage and producing reclaimed water: collecting and extracting sewer sewage from the metallurgical industry through flocculation and sedimentation to meet the reclaimed water requirement that the effluent suspended matter is less than 100mg / l.

[0052] B. Reclaimed water treatment to reduce COD and high-valent ion content: introduce the above reclaimed water into the clarification tank, according to the water quality, when the COD of metallurgical wastewater is 112mg / l, put lime milk at 120mg / l, powdered activated carbon and lime milk at 25mg / l A complete set of dosing devices are used with powdered activated carbon, including dry speculation, dissolution tank, metering pump and matching pipes and valves. Through the mixing, reaction, flocculation, precipitation, clarification, separation, adsorption, and filtration of clarifiers, valveless filters, and multi-media filters, some suspended solids, colloidal substances, organic substances, oils, alkalinity su...

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Abstract

The deep treatment process of metallurgical sewage includes the following steps: 1. collecting sewage and producing intermediate water; 2. treating intermediate water with lime milk and powdered active carbon to lower COD and high valent ion content; 3. ultrafiltering treatment to reach SDI lower than 3; and 4. reverse osmosis and desalting treatment. The treatment with lime milk and powdered active carbon before reverse osmosis can lower COD of water to ensure the normal operation of the reverse osmosis system and reduce the time number of chemical water of the reverse osmosis system. The present invention has low investment and low power consumption.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a process method for reducing COD in advanced treatment of metallurgical sewage, and belongs to the technical field of wastewater treatment. Background technique [0002] Water is an important and precious resource on the earth. Today, the shortage of water resources and the pollution of circulating water bodies are becoming more and more serious, and the contradiction between supply and demand of water resources is becoming increasingly prominent. The metallurgical industry is a large consumer of water resources, and most enterprises have a large amount of wastewater discharge, low recycling rate, and high fresh water consumption per ton of steel in the production process. In order to improve the level of sewage resources, reduce fresh water consumption per ton of steel, and alleviate the contradiction between supply and demand of water resources, in the early 21st century, the metall...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F1/52C02F1/28C02F1/44C02F5/00C02F103/16
Inventor 王竹民任志刚董金冀陈小青
Owner HEBEI IRON AND STEEL
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