Resource treatment method of carbendazol production wastewater
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A technology for producing wastewater and treatment methods, which is applied in the fields of natural water treatment, chemical instruments and methods, and multi-stage water/sewage treatment. pressure, cost reduction effect
Inactive Publication Date: 2017-05-10
SHANGHAI WINNER ENVIRONMENTAL TECH
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However, with the implementation of the new national environmental protection law and the promulgation of the "Water Ten Measures", higher requirements have been put forward for the utilization of water resources and the discharge of high-salt wastewater, and the traditional technology can no longer meet the new requirements.
At the same time, based on the "zero discharge" process of MVR evaporation and crystallization, the mixed salt and miscellaneous salt obtained at the end belong to the category of solid hazardous waste, which is difficult to dispose of, and the salt resources cannot be utilized.
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Embodiment 1
[0033] (1) Wet oxidation: Take 100ml of waste water and put it into a 500ml high-pressure reactor, add 0.5g of copper sulfate, seal it, keep the pressure at 0.8MPa, then raise the temperature to 200°C, react for 2h, cool, and cool down to obtain an oxidation post-treatment solution. The detected COD dropped from 46500mg / L to 8118mg / L.
[0034] (2) After the wet oxidation treatment, the pH of the waste water is adjusted by adding sodium hydroxide to 11.0, and then it is sent to rectification and deamination. The sodium hydroxide is the sodium hydroxide that reclaims and obtains in the bipolar membrane electrodialysis process in the step (5).
[0035] (3) After adding 28g of sodium carbonate to remove hardness, the hardness in the wastewater was reduced from 26600mg / L to 60mg / L.
[0036] (4) Adopt macroporous resin to adsorb and remove amines in the waste water, and characterize it with COD. The COD concentration is reduced from 8000mg / L to 3160mg / L, and the acid-base recovered...
Embodiment 2
[0042] (1) Wet oxidation: Take 500ml of waste water and put it into a 1000ml autoclave, add 2.5g of copper sulfate, seal it, keep the pressure at 0.8MPa, then raise the temperature to 200°C, react for 2h, cool, and lower the temperature to obtain the post-oxidation treatment liquid, which is tested COD dropped from 46500mg / L to 8008mg / L.
[0043] (2) After the wet oxidation treatment, adding sodium hydroxide to the water to adjust the pH of the waste water is 11.0, and then sending it into the rectification deamination, the residual liquid ammonia nitrogen concentration in the detection kettle is 600.4mg / L, and the total nitrogen concentration is 2583mg / L; The sodium hydroxide is the sodium hydroxide that reclaims and obtains in the bipolar membrane electrodialysis process in the step (5).
[0044] (3) After adding 28g of sodium carbonate to remove hardness, the hardness in the wastewater was reduced from 26600mg / L to 40mg / L.
[0045] (4) Use macroporous resin to adsorb and r...
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Abstract
The invention relates to the field of the resource treatment of industrial wastewater, and discloses a resource treatment method of carbendazol production wastewater. The resource treatment method comprises the following steps of (1), carrying out a wet oxidation reaction on the carbendazol production wastewater, and degrading a residual organic matter in the oxidized wastewater; (2), recovering ammonia water in a rectifying tower; (3), removing hardness by adopting sodium carbonate; (4), adsorbing and removing an amine substance in the wastewater by resin, and resolving and regenerating the wastewater through an acid and an alkali, so as to obtain strong salt water; (5), recovering the acid and a salt by utilizing a bipolar membrane electrodialysis process; (6), carrying out subsequent biochemical treatment on low-salt-content water, and then discharging the low-salt-content water up to a standard. The method is simple to operate; based on a membrane technique, a resin exchange technique and a bipolar membrane electrodialysis technique, the high-efficiency resource utilization of the acid and the alkali in high-salt wastewater is realized; further, the recovered acid and alkali, on one hand, can be used as an agent to be circularly used for wastewater treatment and the resolution of the resin, and on the other hand, can be used as a product to produce economic benefit, thereby realizing appreciation.
Description
technical field [0001] The invention relates to the field of carbendazim production wastewater treatment technology, in particular to a resource treatment method for carbendazim production wastewater. Background technique [0002] Carbendazim, alias cotton wilt, benzimidazole No. 44, befenti BCM, etc., chemical name N-(2-benzimidazole) methyl carbamate. Its molecular formula is as follows: [0003] [0004] As a broad-spectrum fungicide with high efficiency and low toxicity, it is effective against many Ascomycetes, Deuteromycetes and various Basidiomycetes. It can be used in a wide range of applications, such as industrial fungicides for mildew prevention in papermaking, textile, leather and other industries, and can also be used as a systemically active plant fungicide for fruit preservation, prevention and treatment of wheat head blight, rice Sheath blight, powdery mildew, anthracnose, etc. [0005] Industrial large-scale production of carbendazim is mainly based on...
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