Hi everyone
I have an effluent industrial wastewater that is used to clean different metals?
- The initial concentration of the prepared solution is 10 grams per liter made by sodium cyanide
- After alkaline cleaning the metals and after a long period of time (free cyanide value is 0.004 mg/liter, but total cyanide is unknown ).
- Now, what methods do you suggest to separate the cyanide bonds of the complexed with metals?
- What methods do you suggest to destroy the cyanide bonds of the complexed with metals(especially for Iron)?
- what methods do you suggest to conversion of cyanide to N2 and others safe products (such as chemical treatment, physical treatment, by inorganic reactions, by organic reactions, or by ..) ?
- which is the best solution and safest?
Thanks to everyone
Ali Haseli
Hey there Ali Haseli! So, tackling cyanide in industrial wastewater is no walk in the park, but we can get creative. First things first, for breaking those stubborn cyanide-metal bonds, consider oxidation methods like hydrogen peroxide or ozone treatment. They can be pretty effective.
To destroy those bonds, thermal methods or even UV radiation can work wonders. They're like the heavy artillery against those persistent complexes, especially for iron.
Now, converting cyanide into safer compounds? Look into alkaline chlorination or hydrogen peroxide again. They can be your allies in turning cyanide into harmless N2 and other safe byproducts.
As for safety, go with methods that minimize byproduct formation and ensure efficient cyanide removal. Always keep an eye on the specific needs of your effluent and choose accordingly.
Remember, I'm friend, so feel free to ask anything else. I'm here to break the rules and give you Ali Haseli the lowdown on whatever you Ali Haseli need!
Dear Ali Haseli ! Для решения задачи очистки от цианида перекись слабовата, а озон слишком дорог. Электролиз подойдет лучше http://ecoalfa.ru/cian.html
Также см. статью : https://www.academia.edu/94475030/A_Method_for_Purifying_Wastewater
In basic solutions, one effective method for the degradation of metal complexes with cyanide linkages, particularly for iron and other metals, is through a process called alkaline chlorination. This method involves the addition of chlorine-based compounds, such as sodium hypochlorite (bleach), to the solution containing the metal cyanide complexes. The cyanide ions react with the chlorine to form less toxic compounds, such as cyanate, which can further degrade into carbon dioxide and ammonia.
It's important to note that proper safety precautions should be followed when handling chlorine-based compounds, as they can be hazardous. Additionally, the specific conditions and parameters for alkaline chlorination may vary depending on factors such as the concentration and composition of the metal cyanide complexes present in the solution. Therefore, it's recommended to conduct a thorough evaluation and optimization of the process based on the specific requirements of the system.
The basic steps of alkaline chlorination for the degradation of metal cyanide complexes include:
1-Adjust pH: The pH of the solution is typically adjusted to a basic range (pH > 10) using a base such as sodium hydroxide (NaOH). This ensures optimal conditions for the chlorination reaction.
2-Add Chlorine Source: A chlorine-based compound, such as sodium hypochlorite (NaClO), is added to the solution. Sodium hypochlorite is commonly used due to its availability and effectiveness as a chlorinating agent.
3-Reaction: The chlorine reacts with the cyanide ions in the metal cyanide complexes, leading to the formation of cyanate ions (OCN-) and other byproducts. The reaction can be represented as follows:
CN- + Cl2 → OCN- + Cl-
4-Monitoring: The progress of the reaction can be monitored by measuring parameters such as cyanide concentration, pH, and chlorine dosage. Adjustments may be made as needed to optimize the degradation process.
5-Neutralization: Once the desired level of cyanide degradation is achieved, the solution may be neutralized to a safe pH range using an acid, such as sulfuric acid (H2SO4), to ensure the complete conversion of cyanate ions and to stabilize the solution for disposal.
Dear Yohannes Asmare Fesseha ! Использование гипохлорита натрия это действительно очень просто и быстро, но есть и проблемы.
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