Treatment method for wastewater containing small-molecular organic matter

A treatment method and small molecule technology, applied in water/sewage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult treatment, low efficiency of organic amine treatment, multiple treatment processes, etc. Achieving a good treatment effect

Inactive Publication Date: 2016-08-31
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Organic amine wastewater is a difficult-to-treat organic matter. At present, domestic conventional treatment methods for organic amine wastewater mainly include biochemical treatment methods, among which biochemical treatment methods have limited effects, and other methods also have problems such as low efficiency of organic amine treatment and environmental pollution.
Chinese patent document CN102372374B discloses a method for recycling and harmless treatment of organic amine solvents. Through the combined process of filtration-extraction-rectification-high temperature digestion, organic amines with a purity of more than 97% can be obtained, but the A large amount of solvent is used in the process, the cost is high, and it has certain toxicity. If the control is not good, it will cause secondary pollution.
[0004] Chinese patent document CN104098228B discloses a treatment method for organic amine biochemical effluent, by adding a small amount of oxidant for pre-oxidation, and then performing biochemical treatment. In order to make the organic amine biochemical effluent meet the standard, a combined process of enhanced coagulation-advanced oxidation-biological advanced treatment is adopted. It can effectively reduce the amount of oxidant and reduce operating costs, but the biochemical treatment cannot handle high-salt, high-COD organic amine wastewater systems, and the entire process has too many treatment processes and is difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Pyridine wastewater quality: COD=65615mg / L, TOC (total organic carbon)=25380mg / L, NH 3 -N=5381 mg / L, TN (total nitrogen)=10500 mg / L, pH=11.7.

[0048] (1) Catalytic wet oxidation: adjust the pH of pyridine wastewater to 5.6, transfer it to a titanium reactor, increase the reaction pressure from 1.1MPa (normal temperature) to 6MPa (260°C), feed air, the reaction pressure is 6MPa, and maintain the reaction temperature 260°C, based on the quality of pyridine wastewater, add a homogeneous catalyst CuSO with a mass fraction of 1% 4 , using a batch reactor to react in stages, each stage reacted for 1.5h, and the total reaction was 3h.

[0049] After catalytic wet oxidation treatment, the water quality of the wastewater discharged from the kettle: COD=2784mg / L, TOC=1120mg / L, NH 3 -N=8100 mg / L, TN=9200 mg / L, pH=6.5.

[0050] (2) Deamination membrane: Catalytic wet oxidation effluent is added with liquid caustic soda to adjust the pH to 12.2, cooled to 40°C, flow rate is 0.19...

Embodiment 2

[0053] Two kinds of pyridine ring wastewater, the water quality is as follows:

[0054] Wastewater 1: COD=77510mg / L, TOC=176900mg / L, TN=38500mg / L.

[0055] Wastewater 2: COD=33110mg / L, TOC=14600mg / L, TN=10150mg / L.

[0056] (1) Alkali analysis: add liquid caustic soda in waste water 1 and adjust the pH of waste water to 12.8, stratification occurs after standing for a few minutes, the upper layer is the oil phase, the lower layer is the water phase, the oil phase volume accounts for 25% of the total volume, and the water phase The phase volume accounts for 75% of the total volume.

[0057] After liquid separation, the purity of triethylamine in the oil phase was determined by spectrophotometry, and the water quality of the water phase: COD=40480mg / L, TOC=21680mg / L, TN=13100mg / L.

[0058] Before catalytic wet oxidation, the oil phase is removed, which reduces the risk of high temperature and high pressure explosion in wet oxidation when the concentration of organic amine is hi...

Embodiment 3

[0065] The step (1) of embodiment 2 is followed by the membrane distillation step. The water phase in step (1) was heated to 40°C, the flow rate was 0.16m / s, and the organic amine was recovered by air cooling. The COD=36790mg / L, TOC=18160mg / L, TN=10020mg / L of the treatment liquid were measured in 1h.

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Abstract

The invention discloses a treatment method for wastewater containing small-molecular organic matter. The method includes the steps that firstly, wastewater is subjected to wet oxidation and/or photocatalytic oxidation to obtain a treatment solution; secondly, volatile small molecules in the treatment solution are removed through membrane distillation. The method further includes the preprocessing step. Preprocessing is conducted in at leas one of the following modes. According to the first mode, wastewater is adjusted to be alkaline, stands still and is layered to obtain an aqueous phase and an oil phase, the aqueous phase serves as the wastewater, and the first step or a second mode continues to be conducted. According to the second mode, small molecules are removed from wastewater through membrane distillation, the obtained solution serves as the wastewater, and the first step continues to be conducted. According to a third mode, wastewater is rectified to separate small-molecular organic matter, and the first step continues. By means of the method, organic amine can be completely and effectively recycled or decomposed, the byproduct, namely ammonia salt, is obtained, and harmless treatment is conducted. Meanwhile, wastewater high in COD and salt content can be effectively treated, and the method is environmentally friendly and suitable for wastewater treatment of industrial devices.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating wastewater containing small molecular organic matter. Background technique [0002] Organic amine is an important chemical raw material with a wide range of uses, and by-products and waste water will inevitably be produced in the process of its production and synthesis. At the same time, with the increasing demand for organic amine raw materials in fine chemical industry, the waste water generated in the production process of related products is also increasing day by day. Random discharge into water bodies will cause eutrophication of water bodies. Long-term use of organic amine solvents will cause spontaneous Polymerization forms toxic and carcinogenic diethylene glycol and other harmful substances, so organic amines need to be treated and recycled. [0003] Organic amine wastewater is a difficult-to-treat organic matter. At present, domestic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/44C02F101/38
CPCC02F1/72C02F1/447C02F1/725C02F2101/38
Inventor 赵文超李谭刘孟王炜杰孔令娇贾军芳钟芳华周小龙吴勇前陈磊
Owner ZHEJIANG QICAI ECO TECH CO LTD
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