1. Overview of iron-carbon microelectrolysis.
When the iron filings are immersed in the wastewater solution, a complete micro-battery circuit is formed, forming an internal electrolysis reaction, which is called microelectrolysis. When inert carbon (such as graphite, coke, activated carbon, coal, etc.) particles are added to the cast iron filings, the iron filings come into contact with the carbon particles, and the galvanic battery formed is the iron-carbon microelectrolysis method. The core of this method is to electrolyze wastewater by using the potential difference generated by the microelectrolytic materials (such as iron-carbon fillers) filled in the wastewater to achieve the purpose of degrading organic pollutants.
Iron-carbon microelectrolytic fillers
Electrochemical descaling technology with titanium oxide electrode as the core.
Analysis of the principle of ferrite method for treating electroplating wastewater.
2. Technical principles.
Iron-carbon microelectrolysis technology mainly uses the reduction of iron, the electrochemistry of iron, and the flocculation and adsorption of iron ions to purify wastewater.
The electrolytic materials of the iron-carbon microelectrolysis process generally use cast iron filings and activated carbon or coke, and when the material is immersed in industrial wastewater (such as coking wastewater, electroplating wastewater), internal and external electrolytic reactions occur. Due to the potential difference between iron and carbon, iron loses electrons at the anode and is oxidized into divalent iron ions (Fe) into solution. At the same time, the reduction reaction occurs on the cathode to produce new ecological hydrogen ([H]) and primary ecological ferrous ions (Fe), which have high chemical activity and can undergo redox reactions with many organic substances in wastewater, so that the organic matter can be broken and looped, thereby degrading organic pollutants. In addition, the cast iron filings and the surrounding carbon powder form a larger galvanic cell, so the process of wastewater treatment using microelectrolysis is actually a process of internal and external dual electrolysis, or there is a microscopic and macroscopic galvanic cell reaction. In addition, in order to increase the potential difference, promote the release of iron ions and improve the treatment effect, a certain proportion of metal powder such as copper powder or lead powder can also be added as a catalyst.
3. Process flow.
The process flow of iron-carbon microelectrolysis technology includes preparation stage, acidification regulation, aeration or stirring, reaction progression, solid-liquid separation, subsequent treatment and sludge treatment.
Fill the iron-carbon micro-electrolytic material (such as iron-carbon filler) into the reaction tank or reaction tank, and add an appropriate amount of wastewater; Add an appropriate amount of acid, such as sulfuric acid or hydrochloric acid, to the wastewater for pH acidification adjustment; By aeration or stirring, the wastewater can be fully contacted and mixed with the iron-carbon filler; Under the action of aeration or stirring, the iron-carbon filler undergoes an electrochemical reaction with the organic matter in the wastewater. After a certain period of reaction, the organic matter in the wastewater combines with iron ions to form flocs (iron sludge), and finally other substances produced are treated according to the actual situation.
What is Flocculant? What is the mechanism of action? 4. Application field and process characteristics.
Iron-carbon microelectrolysis technology is widely used in various industrial wastewater treatment, such as printing and dyeing, chemical industry, electroplating, pulp and paper, pharmaceutical, wool washing, pesticides, alcohol and other industrial wastewater treatment and treatment water reuse projects. It has the characteristics of fast reaction speed, wide range of pollutants, convenient operation, reduction of secondary pollution, and diverse application methods.
The five principles of the sludge drying process.