Sludge Deodorization via Fluidized Air Bed and Flocculation
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Solution Overview
Problem
Existing methods for deodorizing sludge are costly, require expensive reagents, and do not effectively address odor issues during transportation and handling, while also failing to improve dewatering processes.
Innovation Solution
A method involving injecting liquid sludge into a pressurized chamber with a high airflow rate, creating a fluidized bed that aerolizes the sludge, followed by the introduction of a flocculant to aggregate and coagulate organic matter, resulting in rapid deodorization and enhanced dewatering with low electrical consumption and minimal material use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sludge is treated with compounds that release active oxygen (hydrogen peroxide, alkaline perborates, alkaline persulfates), then deodorization is achieved, but treatment cost increases and reagent addition complexity increases
Solution Approach 1:
The system uses compressed air as a self-renewing resource that is continuously supplied to the chamber. The air flows through the sludge, automatically providing oxidation without requiring external reagent addition. The system serves itself by using the compressed air supply already present in the facility, eliminating the need for complex reagent dosing systems.
Solution Approach 2:
The invention replaces expensive, complex reagent systems with a simple, inexpensive compressed air system. The compressed air is a disposable medium that is continuously supplied and does not require recovery or special handling, unlike chemical reagents. This eliminates the need for expensive reagents while maintaining effective deodorization.
2Object-affected harmful factors
If sludge is kept in contact with nitrogen oxide gas for several tens of minutes, then deodorization is achieved, but treatment time increases
Solution Approach 1:
The invention changes the key parameter from contact time to air flow rate. Instead of maintaining low flow rate for extended periods, the system uses high compressed air flow rates (several times the sludge flow rate) to achieve rapid deodorization. This parameter change reduces treatment time while maintaining effectiveness.
Solution Approach 2:
The system employs continuous periodic flow of compressed air through the sludge chamber. The air is supplied continuously at high rates, creating repeated oxidation cycles that rapidly eliminate odors. This periodic action at high intensity replaces the single prolonged contact method, achieving the same result much faster.
3Productivity
If compressed air is injected at high flow rate into the chamber, then rapid deodorization and aerolization are achieved, but energy consumption increases
Solution Approach 1:
The compressed air system serves multiple functions simultaneously: it provides deodorization through oxidation, aerolizes the sludge to increase surface area and porosity, and facilitates rapid mixing. By making the air supply multi-functional, the system achieves high productivity without proportionally increasing energy consumption, as one resource (compressed air) performs multiple tasks.
Solution Approach 2:
The invention uses pneumatic principles by injecting compressed air at high flow rates to create a fluidized bed of sludge particles. The air flow rate is maintained at several times the sludge flow rate, creating a pneumatic suspension that enhances mass transfer and oxidation efficiency. This pneumatic approach achieves rapid deodorization while the energy consumption is justified by the multi-functional benefits and the use of existing compressed air infrastructure.
4Productivity
If flocculant is introduced to aggregate and coagulate organic matter, then dewatering is enhanced, but material addition increases
Solution Approach 1:
The system introduces flocculant in controlled, partial amounts rather than excessive quantities. The flocculant is added continuously but at low concentrations, sufficient to achieve effective aggregation and coagulation. This partial action approach enhances dewatering efficiency while minimizing material addition, avoiding the need for large quantities of chemical additives.
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 rapid deodorization and superior dewatering, producing a porous, odorless, and easily spreadable sludge cake with increased solid content, while being energy-efficient and environmentally friendly.
Implementation Method 1
injecting air at a flow rate Q≥5 q into said chamber, prior to evacuation and separation between solid and liquid parts obtained
Implementation Method 2
said length L, the flow rate and the increased pressure of said column of air being designed to create in the chamber a fluidized bed wherein the sludge is aerolized
Implementation Method 3
a flocculant is continuously introduced into said fluidized bed downstream of the chamber under conditions designed to aggregate and/or coagulate the organic matter
Implementation Method 4
The idea here is to keep the sludges in contact with the nitrogen oxide gas for a sufficiently long time for the chemical exchanges to take place
Data Source
AI summary
The continuous treatment of a flow of organic liquid sludge is disclosed. Following the optional addition of granular mineral matter to the flow, the sludge is injected at a rate q into a column of air which is at overpressure relative to atmospheric pressure. The air column is circulating at a rate Q>5q in a chamber extending over a specific length in order to create a fluidized bed, in which the sludge is aerolized, between air supply piping upstream of the sludge injection and an outlet reservoir downstream of the fluidized bed, the reservoir being substantially at atmospheric pressure. A flocculant is introduced continuously downstream of the chamber into the fluidized bed in order to aggregate the organic matter before the solid part obtained in this way is separated from the liquid part, the resulting solid part thus being deodorized.