Humic Acid Manganese Oxide Composite Catalyst for Deep Manganese Removal
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Solution Overview
Problem
Existing manganese removal technologies struggle to achieve deep-level manganese removal with stable effluent concentrations below 20 μg/L, especially in the presence of heavy metal pollution, and are affected by water quality factors and process conditions.
Innovation Solution
A method utilizing humic acid to prepare a layered humic acid/manganese oxide composite catalyst, which is formed on the surface of a filter material within a manganese-loaded filter column, tank, or pool, allowing for effective removal of heavy metals under various pH conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If strong oxidizing agents (chlorine dioxide, potassium permanganate, ozone) are used for manganese removal, then manganese oxidation efficiency is improved, but harmful by-products are generated and dosage control becomes difficult
Solution Approach 1:
Humic acid serves as an intermediary substance that facilitates manganese oxidation through the formation of composite catalyst on filter material surfaces. The humic acid/manganese oxide composite acts as a mediator between the oxidizing environment and manganese ions, enabling efficient oxidation while avoiding direct use of excessive strong oxidants that generate harmful by-products
Solution Approach 2:
The invention creates a composite material system (humic acid/manganese oxide composite catalyst) that combines the advantages of both humic acid (high stability, selectivity) and manganese oxide (catalytic activity). This composite structure enables effective manganese oxidation with reduced need for strong oxidizing agents, thereby reducing harmful by-product formation
2Productivity
If sand filtration manganese removal technology is used, then manganese removal is achieved, but effluent water quality is easily affected by water quality factors and process conditions
Solution Approach 1:
The invention modifies the chemical and physical parameters of the filter material surface by forming a humic acid/manganese oxide composite catalyst layer. This composite structure changes the surface properties to be more robust against variations in water quality factors (pH, temperature, organic matter content), thereby stabilizing effluent quality across different operating conditions
Solution Approach 2:
The humic acid/manganese oxide composite catalyst is formed specifically on the surface of the filter material, creating a localized zone with enhanced and stable catalytic activity. This localized composite structure ensures consistent performance at the critical interface where manganese oxidation occurs, regardless of bulk water quality variations
3Productivity
If existing manganese removal technologies are used, then manganese removal is achieved, but deep-level manganese removal with stable effluent concentration below 20 μg/L is difficult to achieve
Solution Approach 1:
The invention replaces purely physical filtration mechanisms with a chemical-catalytic mechanism. The humic acid/manganese oxide composite catalyst provides active sites for manganese oxidation, transforming the removal process from passive physical filtration to active catalytic conversion, thereby achieving deeper and more precise manganese removal
Solution Approach 2:
The humic acid/manganese oxide composite acts as an intermediary that enables precise control over manganese oxidation. The composite structure provides controlled release and oxidation of manganese ions, allowing for precise control of effluent concentration at the deep removal level (below 20 μg/L) that cannot be achieved with conventional methods
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves a removal rate of over 95% for iron, arsenic, thallium, molybdenum, and lead, ensuring long-term stable and standard effluent quality with reduced chlorine dosage and improved manganese removal efficiency.
Implementation Method 1
The diverse active functional group composition of humic acid makes it amphiphilic, showing a strong tendency to interact with metal ions and organic matter in soil and water. Humic acid can interact with various environmental components through coordination and electrostatic attraction
Implementation Method 2
The layered humic acid/manganese oxide composite catalyst prepared by the present invention has a removal rate of more than 95% for iron, arsenic, thallium, molybdenum, and lead
Implementation Method 3
Humic acid contains both electron-withdrawing groups (such as quinone groups) and electron-donating groups (such as phenol groups), which can catalyze the degradation of toxic environmental pollutants and play an important role in natural and engineered redox processes
Data Source
AI summary
A method of utilizing humic acid to prepare layered humic acid/manganese oxide composite catalyst and its application, the method includes the steps of: adding sodium hypochlorite, manganese salt and humic acid to a water source, stirring and mixing; then introducing into a filter device having a filter material of manganese and a support medium, and generating a layered humic acid/manganese oxide composite catalyst on a surface of the filter material while directing a continuous water flow of the water source into the filter device with a short empty bed contact time for a short time. The catalyst can be used to effectively remove manganese to maintain an effluent with a Mn2+ concentration of not more than 20 μg/L and to effectively remove heavy metals such as iron, manganese, arsenic, thallium, molybdenum or lead from the water source under neutral, acidic or alkaline conditions with a removal rate of 95% more.