Comprehensive treatment method and system for hydrazine hydrate waste salt

A comprehensive treatment, hydrazine hydrate technology, applied in the comprehensive treatment method and system field of hydrazine hydrate waste salt, can solve the problems of high treatment cost, only solid waste treatment, and specific requirements for the treatment site, and achieve high economic and social benefit effect

Pending Publication Date: 2021-06-15
浙江海禹环保科技有限公司
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Problems solved by technology

[0004] Chinese patent ZL 201610596020.9 "Recycling and Treatment Method of Hydrazine Hydrate High Salt Wastewater" patent adopts the method of first adding oxidant to oxidize and remove some organic matter, then fractional distillation and centrifugal filtration of the residual liquid to treat hydrazine hydrate high salt wastewater, but this patent does not Further treatment of the obtained solid salt can only be done as solid waste treatment
However, due to the high cost of flash distillation and high-temperature calcination, and the calcined solid salt contains coke-like substances, further t

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  • Comprehensive treatment method and system for hydrazine hydrate waste salt

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Example Embodiment

[0031] Example 1

[0032]1) Take 10kg of hydrazine hydrate by-product salt, prepare a solution with NaCl content of 310g / L with pure water, measure its total organic carbon TOC as 40mg / L, and total nitrogen TN as 20mg / L.

[0033] 2) Adjust the pH of the prepared brine to 8 with 1mol / L HCl, and then perform nanofiltration membrane separation, control the membrane inlet pressure to 3.5MPa, and the temperature to 20°C. According to the nanofiltration membrane, the recovery rate of light liquid is 85%. When the nanofiltration membrane separation is stopped. The measured total organic carbon TOC of the nanofiltration membrane dilute liquid is 15.83mg / L, and the total nitrogen TN is 8.17mg / L.

[0034] 3) Use 1mol / L of HCl to adjust the pH of the nanofiltration membrane light liquid to 5, then carry out photocatalytic oxidation, the ultraviolet wavelength is 222nm, the flow rate of water is controlled to be 0.5m / s, the catalyst is titanium dioxide, the oxidant is oxygen, at temperat...

Example Embodiment

[0041] Example 2:

[0042] 1) Take 10kg of by-product salt obtained on the glyphosate production route, and prepare a solution with a NaCl content of 310g / L. The total organic carbon TOC is 150mg / L, and the total nitrogen TN is 80mg / L.

[0043] 2) Use 1mol / L NaOH to adjust the pH of the prepared brine to 7.5, and then perform nanofiltration membrane separation, control the membrane inlet pressure to 3.2MPa, and the temperature to 25°C. According to the nanofiltration membrane, the recovery rate of light liquid is 90%. When the nanofiltration membrane separation is stopped. The measured total organic carbon TOC of the nanofiltration membrane dilute liquid is 40.83mg / L, and the total nitrogen TN is 15.17mg / L.

[0044] 3) Adjust the pH of the nanofiltration membrane light liquid to 6 with 1mol / L HCl, and then carry out photocatalytic oxidation, the ultraviolet wavelength is 222nm, and the influent flow rate is controlled to be 0.7m / s. The catalyst is titanium dioxide, and the ox...

Example Embodiment

[0051] Example 3

[0052] 1) Take 50kg of hydrazine hydrate by-product salt, prepare a solution with NaCl content of 300g / L with pure water, measure its total organic carbon TOC to be 52.5mg / L, and total nitrogen TN to be 23mg / L. 1mol / L hydrochloric acid to adjust the pH to 5;

[0053] 2) Carry out nanofiltration membrane separation, control membrane inlet pressure to be 2.5MPa, temperature be 18 ℃, stop nanofiltration membrane separation when the recovery rate of light liquid according to nanofiltration membrane is 85%.

[0054] 3) adjust the pH of the nanofiltration membrane light liquid to 4 with 1mol / L of HCl, and then carry out photocatalytic oxidation, the ultraviolet wavelength is 280nm, the flow rate of the water inflow is controlled to be 0.2m / s, the catalyst is manganese dioxide, and the oxidizing agent is ozone. Filtration was performed after circulating the reaction at a temperature of 18° C. for 5 h.

[0055] 4) After adjusting the pH of the above-mentioned filt...

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Abstract

The invention discloses a comprehensive treatment method and system for hydrazine hydrate waste salt, belonging to the technical field of environmental protection. The comprehensive treatment method comprises the following steps: 1) dissolving of the salt; 2) nanofiltration membrane separation; 3) photo-catalytic oxidation; 4) electrocatalytic oxidation; 5) flocculating; 6) filtering; and 7) adsorption, wherein adsorption effluent is the final refined brine. According to the comprehensive treatment method of the hydrazine hydrate waste salt, organic and inorganic impurities in the byproduct salt are removed through a comprehensive treatment technology, and solid salt is separated, purified and refined, so that TOC in refined brine is smaller than 5 mg/L and TN is smaller than 4 mg/L; and the refined solid salt or salt water is used for producing caustic soda and the like in other industries such as the chlor-alkali industry, so the resource utilization of the byproduct salt is realized, and higher economic and social benefits are obtained.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a comprehensive treatment method and system for hydrazine hydrate waste salt. Background technique [0002] In the industrial production process of hydrazine hydrate, a large amount of high-salt organic wastewater is often produced. Due to the high salt content, many types of organic matter, and high toxicity, it is impossible to effectively degrade the organic matter in wastewater directly through biochemical and oxidation methods, and a large amount of water resources will be wasted by blending and diluting. At present, after the high-salt organic wastewater is treated by evaporation technology, a large amount of by-product salt rich in organic matter is obtained. Due to the variety of organic matter in the by-product salt and the high content, it cannot be used as industrial raw material salt, and some manufacturers have piled it up. or as hazardou...

Claims

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Application Information

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IPC IPC(8): C02F9/06C01D3/06C02F101/10C02F101/30
CPCC02F9/00C01D3/06C02F1/66C02F1/442C02F1/32C02F1/725C02F1/722C02F1/78C02F1/727C02F1/76C02F1/4672C02F1/56C02F1/5236C02F1/444C02F1/283C02F1/281C02F1/285C02F2209/20C02F2209/16C02F2101/10C02F2101/30
Inventor 魏超程棋波姚微侯晓峰赵经纬
Owner 浙江海禹环保科技有限公司
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