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Device and method for treating waste water and preparing hydrogen simultaneously

A technology for wastewater and electrolysis devices, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc.

Inactive Publication Date: 2012-11-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The present invention provides a device and method for treating refractory waste water and simultaneously producing hydrogen by means of an electrochemical catalytic oxidation method, which solves the problem of using insoluble anodes for waste water containing toxic and harmful high-concentration organic waste water, heavy metal ions and high ammonia nitrogen that cannot be biochemically processed. High-efficiency device for hydrogen production while improving biochemical performance through advanced catalytic oxidation treatment, and different process methods are designed according to water quality characteristics

Method used

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  • Device and method for treating waste water and preparing hydrogen simultaneously
  • Device and method for treating waste water and preparing hydrogen simultaneously
  • Device and method for treating waste water and preparing hydrogen simultaneously

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Example 1: Treatment of high-concentration organic wastewater containing polycyclic aromatic hydrocarbons.

[0101] Using the device (attached image 3 ) to treat organic wastewater with a COD concentration of 13270mg / L, the voltage is 20V (the voltage fluctuates slightly during the treatment process), and the electrolyte is Na 2 SO 4 The concentration is 10%, after a period of electrolysis, the current is reduced from 0.7A to 0.05A, and the single-electrode COD removal rate and hydrogen production change with time are shown in Figure 7. The purity of hydrogen produced by the electrolysis cathode is greater than 97%, the average energy efficiency is 30%, and the hydrogen production volume is 3400mL.

Embodiment 2

[0102] Example 2: Wastewater containing polycyclic aromatic hydrocarbons and ammonia nitrogen mixture

[0103] Using the device (attached Figure 5 ) to treat organic wastewater with an ammonia nitrogen concentration of 1000mg / L and a COD concentration of 13331mg / L. The voltage is 10V. After a period of electrolysis, the current is reduced from 0.5A to 0.05A. The changes in ammonia nitrogen removal rate and hydrogen production over time are shown in the table Show. The single-electrode COD removal rate is 70%, the hydrogen production is 4460mL, and the energy efficiency is 25%.

[0104]

example 3

[0105] Example 3: Treatment of wastewater containing polycyclic aromatic hydrocarbons under different electrolyte conditions

[0106] Using the device (attached image 3 ) to treat organic wastewater with a COD concentration of 13331mg / L, the electrolytes were 10% sodium sulfate and 10% sodium chloride, and the voltage was 4V. After a period of electrolysis, the current was reduced from 0.5A to 0.05A and 0.04A, and the energy efficiency was 33% and 25%, single-electrode COD removal rate and hydrogen production are shown in the table below. The ultraviolet spectrum of different electrolytes is shown in Figure 8. From the spectrum, it can be seen that different electrolytes have different mechanisms for the degradation of organic matter; the hydrogen production efficiency of sodium sulfate and sodium chloride as electrolyte electrolysis has decreased significantly over time. Hydrogen production efficiency is lower in NaCl electrolyte devices.

[0107]

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Abstract

The invention belongs to the fields of electrochemistry and hydrogen production by waste water and relates to a device and a method for treating waste water difficult to degrade by an electrochemical method and preparing hydrogen simultaneously. The method comprises the following steps of: dividing an electrolytic cell into an anode region and a cathode region by using a partition board (a partition board with holes, a membrane or a cation exchange membrane); performing electrochemical oxidation treatment on the waste water difficult to degrade in the anode region and preparing hydrogen in the cathode region at the same time; and collecting anode gas and cathode gas hydrogen respectively. The device adopts double-region or multi-region electrocatalysis, isolates the anode region from the cathode region by the porous partition board, the membrane or the cation exchange membrane, and selects electrolytic devices with different circulating systems and electrode structures according to the characteristics of water quality. Tourmaline multi-metal or non-metal oxide is added in the anode region to serve as fillers to form three-dimensional electrolysis, so that degradation of organic matters in the anode region is enhanced.

Description

technical field [0001] The invention belongs to the field of resource utilization and recovery, and relates to a device and method for treating refractory organic waste water and simultaneously producing hydrogen by using an electrochemical method. Background technique [0002] Wastewater containing toxic and harmful high-concentration organic wastewater, heavy metal ions, and high ammonia nitrogen has poor biodegradability, and conventional treatment methods are difficult to effect, causing serious environmental pollution. In recent years, advanced oxidation technologies such as photochemical oxidation and electrocatalytic oxidation have shown good application prospects in the field of refractory wastewater treatment due to the generation of strong oxidative hydroxyl radicals that can quickly and completely degrade organic pollutants. The advanced treatment of organic wastewater by electrolysis has been reported abroad since the 1960s, but it has not been applied to actual ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C25B1/10
CPCY02E60/366Y02E60/36
Inventor 马伟程子洪张星王天罡王刃
Owner DALIAN UNIV OF TECH
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