Method for ferrum-carbon micro-electrolysis pretreatment of wastewater containing hydrazine and derivatives thereof

A derivative and micro-electrolysis technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of unindustrialization, low residual concentration of pollutants, difficult to meet Task requirements and other issues, to achieve the effect of promoting electrochemical corrosion, overcoming polarization, and improving the biodegradability of effluent

Inactive Publication Date: 2014-03-26
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The natural purification method is an effective, economical, applicable, simple and energy-saving sewage treatment method, but the treatment cycle is too long to meet the task requirements
The residual concentration of pollutants in the wastewater containing hydrazine and its derivatives treated by the chlorination method is very low. Usually, the indicators of hydrazine can meet the requirements, but the disadvantage is that the concentration of intermediate products is usually difficult to meet the discharge requirements.
But it has not reached the level of industrialization, and some need to use H 2 o 2 or O 3 As an oxidizing agent, some require high reaction temperature and other process conditions

Method used

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  • Method for ferrum-carbon micro-electrolysis pretreatment of wastewater containing hydrazine and derivatives thereof

Examples

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Effect test

Embodiment 1

[0016] The water quality of wastewater: the concentration of hydrazine and its derivatives is 970.95mg / L, COD cr 773.65mg / L, pH value is 9.80. According to the above method, the pH value of the hydrazine-containing wastewater and its derivatives is adjusted to 2.10 with dilute sulfuric acid, and then it is passed through the Fe-C micro-particles with cast iron chips and activated carbon powder as fillers in a weight ratio of 9:1. The electrolytic column is fully reacted for 3 hours under the condition of constant air blowing. After treatment, the removal rate of hydrazine and its derivatives in wastewater was 99.72%, COD cr The removal rate was 71.72%, and the pH value was 5.85.

Embodiment 2

[0018] The water quality of wastewater: the concentration of hydrazine and its derivatives is 896.27mg / L, COD cr 758.40mg / L, pH value is 9.95. According to the above method, the pH value of the hydrazine-containing wastewater and its derivatives is adjusted to 2.02 with dilute sulfuric acid, and then it is passed through the Fe-C micro-particles with cast iron chips and activated carbon powder as fillers in a weight ratio of 9:1. The electrolytic column is fully reacted for 2 hours under the condition of constant air blowing. After treatment, the removal rate of hydrazine and its derivatives in wastewater was 94.44%, COD cr The removal rate was 79.01%, and the pH value was 6.24.

Embodiment 3

[0020] The water quality of wastewater: the concentration of hydrazine and its derivatives is 962.66mg / L, and the pH value is 9.68. According to the above method, the pH value of the hydrazine-containing waste water and its derivatives is adjusted to 2.02 with dilute sulfuric acid, and then it is passed through the Fe-C microparticles with iron shavings and activated carbon powder as fillers in a weight ratio of 9:1. The electrolytic column is fully reacted for 9 hours under the condition of constant air blowing. After treatment, the removal rate of hydrazine and its derivatives in the wastewater was over 91%, and the pH value was 5.17.

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Abstract

The invention discloses a method for ferrum-carbon micro-electrolysis pretreatment of wastewater containing hydrazine and derivatives thereof. The method comprises the following steps: adjusting the pH of the wastewater containing hydrazine and derivatives thereof to 2-4 by using dilute sulphuric acid, and then processing the wastewater containing hydrazine and derivatives thereof of which the pH is 2-4 through a micro-electrolysis column; simultaneously blowing air to the micro-electrolysis column; carrying out ferrum-carbon micro-electrolysis treatment on the wastewater containing hydrazine and derivatives thereof under the continuous air-blowing condition, wherein the mean detention time of the wastewater containing hydrazine and derivatives thereof in the micro-electrolysis column is 2-24 hours, carrying out full reaction, wherein the micro-electrolysis column is an Fe-C micro-electrolysis column, ferrum and carbon are adopted as fillers, the weight ratio of the ferrum to the carbon is (6-30):1, the filler ferrum in the Fe-C micro-electrolysis column is granular or clastic sponge ferrum, iron scraps or scrap iron products, the filler carbon in the Fe-C micro-electrolysis column is a columnar or granular or clastic activated carbon, and the grain size of the fillers ferrum and carbon is 1-50mm. The method is simple and feasible, and relatively low in cost, the removal rate of the hydrazine and derivatives thereof in the wastewater can be up to over 95%, and the removal rate of CODcr can be up to 70-80%.

Description

technical field [0001] The invention relates to a method for pretreating wastewater containing hydrazine and its derivatives, in particular to a method for pretreating wastewater containing hydrazine and its derivatives by iron-carbon micro-electrolysis, and belongs to the field of industrial sewage treatment. Background technique [0002] Wastewater treatment has always been a concern of the environmental protection industry. Wastewater containing hydrazine and its derivatives is widely used as aerospace and missile fuel due to its good energy performance, and is commonly used as liquid rocket propellant for contemporary aircraft. Hydrazine and its derivatives are colorless and transparent liquids with a fishy smell, are weakly alkaline, and are poisonous. With the rapid development of the aerospace industry, the amount of hydrazine propellant wastewater is increasing year by year, and the pollution impact on the experimental plant, launch base and surrounding environment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
Inventor 朱爱萍邹玲玲
Owner YANGZHOU UNIV
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