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

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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 (such as microwave, ultrasonic and aeration enhancement, Fenton, ozone and electrolysis coupling ), etc., but the above-mentioned methods all have different defects and problems in terms of processing efficiency, energy consumption and economy.

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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

Embodiment 1

[0022] Using an integrated micro-electrolysis reactor to treat the actual leather dye wastewater of an enterprise in Tianjin, the water quality is: the appearance is dark black, the chroma is ≈100,000 (diluted multiples); the 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 technical 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 water quality: chromaticity ≈ 200 (diluted times), the chromaticity removal rate is 99.8%; COD is within 700.0mg / L, the dye removal rate reaches 83.9%; energy consumption (EC COD )≈21.9(kWh kg -1 COD). The effluent can enter the follow-up biochemical pool to complete the advanced treatment and discharge up to the standard.

Embodiment 2

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

Embodiment 3

[0026] The actual wastewater of a dyestuff company in Tianjin was treated with an integrated micro-electrolysis reactor. The water quality is: dark red in appearance, chroma ≈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 technical conditions of solid-liquid ratio = 50.0%, aeration rate = 80.0L / h, reflux rate = 16.0L / h, load voltage = 18.0v and residence time = 42h, the effluent water quality: chromaticity ≈ 500 (diluted times), the chromaticity removal rate reaches 99.5%; the COD is within 10050.0mg / L, the dye removal rate reaches 64.1%; the energy consumption (EC COD )≈47.9(kWh kg -1 COD). After the effluent is diluted, it enters the subsequent membrane separation unit for advanced treatment.

[0027] It can be seen that, compared with the current micro-electrolysis or enhanced micro-electrolysis method, the new method of pretreatment of high-s...

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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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