LDH-Carbon Electrode for Selective Phosphorus Removal
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Solution Overview
Problem
Current methods for phosphorus removal from wastewater, such as chemical precipitation and adsorption, suffer from low selectivity, high costs, and environmental concerns due to the need for large chemical usage and sludge production, as well as instability in biological treatment processes.
Innovation Solution
An electrochemical method using a composite of carbon support and layered double hydroxide immobilized on the carbon support, applied in an electrochemical cell with distal and median electrodes, to selectively remove phosphorus through an electric-driving force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical precipitation method is used to remove phosphorus, then phosphorus removal efficiency is improved, but selectivity deteriorates and sludge production increases
Solution Approach 1:
The patent uses adsorbent materials with porous structures (such as activated carbon, zeolite, or modified clay) that provide high surface area for phosphorus adsorption. The porous structure allows selective interaction with phosphorus ions while excluding other ions, thereby improving both removal efficiency and selectivity simultaneously
Solution Approach 2:
The patent modifies the chemical parameters of the adsorbent materials through surface treatment, doping with specific metals, or adjusting pH conditions to enhance phosphorus selectivity. By changing the surface charge density, pore size distribution, or chemical composition of the adsorbent, the system achieves high selectivity for phosphorus over other anions like sulfate and nitrate
2Productivity
If adsorption method is used with conventional adsorbents, then phosphorus removal is achieved, but adsorption rate is low and regeneration consumes large amounts of acid and base
Solution Approach 1:
The patent employs adsorbents with optimized porous structures featuring controlled pore sizes and high surface areas. The porous architecture provides numerous active sites for rapid phosphorus adsorption, reducing the time required to reach adsorption equilibrium from 24-72 hours to a much shorter duration while maintaining high removal capacity
Solution Approach 2:
The patent replaces the conventional slow diffusion-based adsorption mechanism with an electrochemically enhanced process. By applying electrical potential, the system actively drives phosphorus ions to the adsorbent surface, significantly accelerating the adsorption rate and enabling rapid phosphorus removal without relying solely on passive diffusion
3Productivity
If chemical precipitation method is used, then phosphorus can be removed, but large quantity of chemical agents and storage equipment are required
Solution Approach 1:
The patent extracts and eliminates the need for large quantities of chemical precipitation agents by using solid-phase adsorbent materials. The adsorption process directly removes phosphorus from wastewater without requiring added chemicals, thereby eliminating the need for chemical storage facilities, dosing equipment, and sludge handling infrastructure
Solution Approach 2:
The patent employs adsorbent materials that can be regenerated in situ or easily replaced without requiring complex chemical processing equipment. The system achieves phosphorus removal through the inherent adsorption properties of the materials, eliminating dependence on external chemical supply chains and reducing overall system complexity
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
This method achieves rapid and selective phosphorus removal with high adsorption capacity and selectivity, reducing the need for chemical agents and sludge production, and is more environmentally friendly compared to existing techniques.
Implementation Method 1
a composite, an electrode for electrochemical removal of phosphorus and an apparatus comprising the electrode and a method for electrochemical removal of phosphorus
Implementation Method 2
capable of rapidly achieving the effect of selectively removing phosphorus
Data Source
AI summary
A composite is provided, the composite comprises a carbon support, and a layered double hydroxide (LDH) immobilized on the carbon support for selectively removing phosphorus. An electrode for electrochemical removal of phosphorus, and methods and apparatuses for electrochemical purification by utilizing the electrode are also provided.