New method for preprocessing high-salt dye wastewater

A technology for dye wastewater and pretreatment, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., to achieve the effects of reducing accumulation probability, alleviating hardening and pollution, and low cost and energy consumption

Inactive Publication Date: 2013-07-24
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for treating high-salt dye wastewater mainly include photocatalytic oxidation, electrocatalysis, coagulation precipitation, Fenton oxidation, membrane technology and micro-electrolysis and its enhancement methods (suc

Method used

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  • New method for preprocessing high-salt dye wastewater
  • New method for preprocessing high-salt dye wastewater

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1:

[0022] Using an integrated micro-electrolysis reactor to treat the actual leather dye wastewater of an enterprise in Tianjin, the water quality is: dark black appearance, color ≈100,000 (dilution multiple); salt content (calculated as NaCl) = 9.0-10.0%; COD = 4200.0~4500.0mg / L; pH=5.5~6.0; SS=1800.0~1900.0mg / L. Under the process conditions of solid-liquid ratio=50.0%, aeration rate=80.0L / h, reflux rate=16.0L / h, load voltage=20.0v and residence time=24h, the effluent quality: chromaticity≈200 (dilution Multiple), the chroma removal rate is 99.8%; COD is within 700.0mg / L, and the dye removal rate is 83.9%; energy consumption (EC COD )≈21.9(kWh kg -1 COD). The effluent can enter the subsequent biochemical pond to complete advanced treatment and discharge up to the standard.

Example Embodiment

[0023] Example 2:

[0024] Using an integrated micro-electrolysis reactor to treat the actual wastewater from a dye enterprise in Tianjin, the water quality is: dark red in appearance, color ≈2000 (dilution multiple); salt content (calculated as NaCl) ≈5.0%; COD=1500.0~1600.0 mg / L; pH=5.5~7.5; SS=0.38~0.44mg / L. Under the process conditions of solid-liquid ratio=50.0%, aeration rate=80.0L / h, reflux rate=16.0L / h, load voltage=9.0v and residence time=5h, the effluent quality: chromaticity≈50 (dilution Multiple), the chroma removal rate is 97.5%; COD is within 185.0mg / L, and the dye removal rate is 88.1%; energy consumption (EC COD )≈2.18(kWhkg -1 COD). The effluent can be properly diluted and discharged or enter the subsequent membrane separation unit for reuse.

Example Embodiment

[0025] Example 3:

[0026] Using an integrated micro-electrolysis reactor to treat actual wastewater from a dye enterprise in Tianjin, the water quality is: dark red in appearance, color ≈130,000-140,000 (dilution multiple); salt content (calculated as NaCl) ≈13.0-14.0%; COD =28,000.0~30,000.0mg / L; pH=5.0~6.0; SS=800.0~900.0mg / L; TDS=1700.0~1800.0mg / L. Under the process conditions of solid-liquid ratio=50.0%, aeration rate=80.0L / h, backflow rate=16.0L / h, load voltage=18.0v and residence time=42h, the effluent quality: chromaticity ≈ 500 (dilution Multiple), the chroma removal rate is 99.5%; COD is within 10050.0mg / L, and the dye removal rate is 64.1%; energy consumption (EC COD )≈47.9(kWh kg -1 COD). After being diluted, the effluent enters the subsequent membrane separation unit for advanced treatment.

[0027] It can be seen that the new method of pretreating high-salt dye wastewater of the present invention, compared with the current micro-electrolysis or enhanced micro-elec...

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Abstract

The invention discloses a new method for preprocessing high-salt dye wastewater, and the new method comprises the following steps of: injecting the high-salt dye wastewater with certain volume into an integral micro-electrolyzer, and sequentially opening a water pump and an air pump so that iron/carbon fillers are in a suspended state by dint of the dual thrust of circulating water flows and aeration; switching on DC (Direct Durrent), and regulating and controlling input voltage according to the COD (Chemical Oxygen Demand) of wastewater; measuring the colority and COD of water after certain retention time, and judging the quality of the water; and carrying out coagulating sedimentation on the effluent water to complete standard discharge or biodegradability, and the like, wherein the processing process is in a sequencing batch way. The new method is characterized in that the decoloring ratio of the high-salt dye wastewater is approach to 100.0% and the COD removal ratio achieves 65.0-90.0% under the coupling action of the circulating water flow cooperating with aeration and an external electric field. The method disclosed by the invention not only effectively remove the colority and COD of the high-salt dye wastewater and has the advantages of easiness for operation and low energy consumption; and compared with the traditional micro-electrolytic method or composite micro-electrolytic method, the method disclosed by the invention is outstanding in high-efficiency and low-energy consumption mainstream development conception.

Description

technical field [0001] The invention relates to a new method for pretreating high-salt dye wastewater with high efficiency and low consumption. Background technique [0002] Dye wastewater has the characteristics of high chroma, complex composition, refractory biodegradation and high content of inorganic salts, and its direct discharge will seriously endanger the aquatic environment and human health. For this reason, it is an inevitable trend to develop modern water treatment technology to deeply explore new methods for high-efficiency, low-consumption, safe and economical treatment of high-salt dye wastewater. At present, the methods for treating high-salt dye wastewater mainly include photocatalytic oxidation, electrocatalysis, coagulation precipitation, Fenton oxidation, membrane technology and micro-electrolysis and its enhancement methods (such as microwave, ultrasonic and aeration enhancement, Fenton, ozone and electrolysis coupling ) etc., but the above-mentioned met...

Claims

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Application Information

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IPC IPC(8): C02F1/461
Inventor 文晨杨志清余曦
Owner TIANJIN POLYTECHNIC UNIV
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