Fenton Fluidized Bed Reactor for Wastewater Iron Removal
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Solution Overview
Problem
Existing Fenton fluidized-bed devices face issues with long retention time, uneven water distribution, low reagent use efficiency, and high iron content in effluent, leading to inefficient wastewater treatment and excessive iron-containing sludge production.
Innovation Solution
A device comprising an adjusting tank, lift pump, and main reaction column with a conical bottom and partitioned troughs for even reagent distribution, along with guide plates and an inclined plate to create a whirled flow and separate crystallized particles, optimizing reagent use and iron elimination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional Fenton oxidation process is used, then simple technical procedure and low investment cost are achieved, but reagent utilization efficiency is low and iron-containing sludge yield is high
Solution Approach 1:
The patent introduces a fluidized bed reactor as an intermediary device between the Fenton reagent addition and the wastewater treatment process. This reactor uses packing materials (such as activated carbon, zeolite, or ceramic particles) as a mediator to catalyze the oxidation reaction, improving reagent utilization efficiency while maintaining the simplicity of the conventional Fenton process
Solution Approach 2:
The patent employs porous packing materials in the fluidized bed reactor, such as activated carbon, zeolite, or ceramic particles with porous structures. These materials provide large surface areas for catalytic reactions, enhancing the efficiency of Fenton reagent utilization and reducing iron-containing sludge production through improved reaction kinetics
2Reliability
If Fenton fluidized bed is used to treat wastewater with high recalcitrant organic pollutants, then treatment effectiveness is improved, but reagent addition amount must be increased
Solution Approach 1:
The patent changes the physical state and distribution parameters of the Fenton reagent by introducing it into a fluidized bed system. The reagent is distributed throughout the packing material particles, creating numerous reaction sites that enhance treatment effectiveness without requiring proportional increases in reagent dosage
Solution Approach 2:
The patent uses composite packing materials that combine multiple functionalities, such as activated carbon with catalytic properties, or zeolite with ion exchange capabilities. These composite materials enhance the degradation of recalcitrant organic pollutants through synergistic effects, improving treatment effectiveness while optimizing reagent usage
3Power
If trivalent iron is present in the Fenton reagent, then catalytic activity is enhanced, but iron-containing sludge formation increases
Solution Approach 1:
The patent implements a system where iron-containing particles are continuously circulated through the fluidized bed reactor. The packing materials capture and retain iron species, preventing them from forming sludge in the effluent. The concentrated iron is retained within the reactor system, allowing for potential recovery or controlled disposal
Solution Approach 2:
The packing materials in the fluidized bed act as intermediaries that bind and immobilize iron species. These materials serve as a bridge between the soluble iron in the Fenton reagent and the solid phase, preventing iron precipitation as sludge while maintaining catalytic activity on the particle surfaces
4Stability of the object's composition
If guide plates are added to create whirled flow, then mixing efficiency is improved, but device complexity increases
Solution Approach 1:
The patent employs curved or inclined guide plates that create whirled flow patterns in the fluidized bed reactor. These curved surfaces redirect the upward flow of fluidized particles, generating rotational motion that enhances mixing efficiency without requiring complex mechanical mixing devices
Solution Approach 2:
The fluidized bed system itself provides the mixing function through the natural movement and collision of particles in the fluidized state. The guide plates simply redirect this self-generated motion to create whirled flow, allowing the system to mix itself without external mechanical intervention
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 solution enhances reagent efficiency, reduces iron content in effluent, and maintains a stable fluidized state by ensuring homogeneous mixing and effective separation of particles, improving overall wastewater treatment outcomes.
Implementation Method 1
Due to potent oxidation capability of hydroxy radicals it releases, Fenton reagent exerts excellent effect in removing recalcitrant pollutants
Implementation Method 2
The Fenton fluidized-bed process can change trivalent iron, which is prone to form iron-containing sludge, into the crystals of iron oxide catalyst, which then deposit on the surface of the packing material
Implementation Method 3
the existence of heterogeneous catalysis and reduction/dissolution process
Data Source
AI summary
The present invention discloses a device for Fenton fluidized-bed process and a method applying the device for wastewater treatment. It belongs to the wastewater treatment field. The device comprises an adjusting tank, a lift pump and a main reaction column. The adjusting tank is connected to a water distributing trough on the top of the main reaction column through the lift pump; the main reaction column is filled with the packing material, and below the packing material is equipped with an obcone, whereon a plurality of inlets are provided and a slag discharge pipe is connected to the bottom; above the packing material is installed an inclined plate, above which and at the upper end of the main reaction column are arranged with a partitioned trough and an outflow trough; the partitioned trough is evenly divided by a vertical plate into two independent chambers; the upper end of each chamber is connected to the water distributing trough while the lower end of each chamber is designed with an outlet; the outlets of the two independent chambers are connected to the inlets on the obcone through the first circulation pump and the second circulation pump respectively; the outflow trough is installed opposite the partitioned trough. When being used to treat biotreated wastewater, the device disclosed in the present invention can enhance use efficiency of the reagent, and maintain high effect and stability in eliminating iron in the wastewater.