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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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 excee

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  • Deep treatment process of metallurgical sewage
  • Deep treatment process of metallurgical sewage

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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

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Claims

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Application Information

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Owner HEBEI IRON AND STEEL
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