Wastewater treatment method by ultrasonic reinforcement micron-scale iron-copper bimetallic particle

Abstract

The present invention relates to a wastewater treatment method by ultrasonic reinforcement micron-scale iron-copper bimetallic particles, and belongs to the field of refractory wastewater treatment. The method includes the following process steps: adding the micron-scale iron-copper bimetallic particles to a reactor, then feeding wastewater to-be-treated continuously to the reactor and starting an ultrasonic probe, treating the wastewater by the micron-scale iron-copper bimetallic particles which are in a fluidized state with the action of ultrasonic, and continuously discharging the wastewater processed by the micron-scale iron-copper bimetallic particles from the reactor, wherein the retention time of the wastewater in the reactor is 0.2-1.0 h. The method not only improves the efficiency of wastewater treatment, but also can prevent the ultrasonic probe from cavitation corrosion and packing passivation compaction, and broadens the range of pH for the wastewater treatment.

Description

Technical field [0001] The invention belongs to the field of refractory wastewater treatment, and particularly relates to a method for treating wastewater with ultrasonic enhanced metal particles. Background technique [0002] There are a large number of tiny cementites inside the zero-valent iron particles. When they are immersed in a conductive electrolyte solution, the galvanic effect occurs between the cementite in the zero-valent iron particles and the iron to form a large number of microscopic corrosion cells , In the galvanic cell reaction, Fe 0 And cementite (C) are used as anode and cathode respectively. The galvanic corrosion reaction of the anode provides a large amount of electrons and is consumed by corrosion. The electrochemical corrosion also causes flocculation, adsorption, bridging, sweeping, co-precipitation, electrodeposition, A series of synergistic effects such as electrochemical reduction. Zero-valent iron technology is produced based on the principle of ir...

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Problems solved by technology

However, this method has the following disadvantages: (1) The fixed bed structure is not conducive to the effective fluidization of the filler, the mass transfer process of pollutants and their degradation products between the surface of the filler particles and the solution is limited, and the concentration of pollutants and iron Corrosion products will co-precipitate on the surface of the filler particles, and long-term operation of the reactor will lead to the formation of a passivation film on the surface of the filler particles, which will seriously affect its treatment efficiency for wastewater; (2) The filler is fixed inside the reactor, and the low-intensity ultrasonic Only part of the packing at the top of the reactor has micro-jet action and shock wave damage, while most of the packing in the reactor cannot receive ultrasonic waves and undergoes corrosion, hardening and passivation; (3) The structure of the reactor is cylindrical, and this structure It will cause the filler particles in the reactor to diffuse around the bottom of the reactor under the action of ultrasonic waves and accumulate around the bottom, which limits the synergy between ultrasonic waves and zero-valent iron, thus seriously affecting the treatment efficiency of wastewater

[0004] In order to overcome the shortcomings of the narrow pH range of zero-valent iron technology and the rapid consumption of iron, Chinese patent ZL02111901.5 discloses a method for treating refractory wastewater by catalytic iron electrolysis. The potential difference between carbons can cause galvanic corrosion to degrade pollutants under neutral conditions. After mixing copper, iron and zeolite, they are filled into the filter in the form of a fixed bed, and the waste water is treated by returning the waste water. However, this method still has some disadvantages: (1) The barrier of zeolite and the gap between iron and copper will greatly limit the contact between iron and copper, resulting in the macroscopic primary battery and battery between iron and copper. The formation of couple corrosion is limited, and the efficiency of wastewater treatment is reduced; (2) The form of fixed bed limits the mass transfer process of pollutants and their degradation products between the surface of filler particles and the solution, thus affecting the efficiency of wastewater treatment; (3) Fixed bed The form of the bed will also lead to co-precipitation of pollutants and iron corrosion products on the surface of the filler particles. Long-term operation of the reactor will lead to the formation of a passivation film on the surface of the filler particles, which will seriously affect the efficiency of wastewater treatment.

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