Iron Sludge Pyrolysis Residue Composite Conditioner
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Solution Overview
Problem
Current sludge treatment methods, particularly in urban sewage treatment plants in China, face challenges in dewatering and resource utilization of iron-containing sludge, leading to inefficient sludge disposal and waste of resources due to the difficulty in effectively utilizing the high iron content and organic matter in sludge pyrolysis residues.
Innovation Solution
A sludge composite conditioner is developed using iron-containing sludge pyrolysis residue, combined with an oxidant, to enhance sludge dewatering efficiency through controlled pyrolysis and reaction conditions, allowing for the reuse of iron-rich residues as a conditioner, thereby improving dewaterability and facilitating resource recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Fenton reagent advanced oxidation technology is used for sludge conditioning, then sludge dewatering efficiency is improved, but a large amount of iron sludge is generated that requires further treatment
Solution Approach 1:
The patent recovers iron from the iron sludge generated by Fenton reagent treatment through pyrolysis, converting it into a reusable conditioner. The iron-containing sludge is pyrolyzed at 500-900°C to produce biochar and iron compounds, which are then used as a composite conditioner for sludge dewatering, thus recovering the iron substance that would otherwise be discarded.
Solution Approach 2:
The patent converts the harmful iron sludge waste product into a beneficial conditioner. The iron sludge that causes disposal problems is transformed through pyrolysis into a composite conditioner containing biochar and iron compounds, which improves sludge dewatering efficiency. This turns the harmful waste into a useful resource.
2Loss of substance
If iron sludge is deeply dewatered to reduce volume, then transportation cost is reduced, but the organic matter and iron content cannot be effectively utilized
Solution Approach 1:
The patent applies preliminary pyrolysis treatment to the iron sludge before final disposal or use. By conducting pyrolysis at 500-900°C, the organic matter is converted into biochar and combustible gases, and the iron is transformed into reusable compounds. This preliminary action extracts value from the sludge before it is disposed of or used as conditioner.
Solution Approach 2:
The patent changes the chemical and physical parameters of the iron sludge through pyrolysis treatment. The high temperature process transforms the sludge from a wet, organic-rich material into a dry, carbon-rich biochar with concentrated iron compounds. This parameter change enables both volume reduction and resource recovery.
3Loss of energy
If sludge pyrolysis is used to convert organic matter into combustible gas, then energy recovery is improved, but the iron content in residue is not effectively utilized
Solution Approach 1:
The patent makes the pyrolysis process multi-functional by simultaneously achieving energy recovery and iron resource utilization. The pyrolysis residue is not discarded but used as a sludge conditioner, combining the functions of energy production and material recycling in one process system.
Solution Approach 2:
The patent creates a composite conditioner from pyrolysis residue that combines biochar and iron compounds. This composite material leverages the synergistic effects of both components for enhanced sludge dewatering, while the iron resource is effectively utilized rather than wasted.
4Productivity
If traditional chemical conditioners are used for sludge dewatering, then dewatering effect is achieved, but transportation cost and reagent purchase cost increase
Solution Approach 1:
The patent implements self-service by using the iron sludge generated from the dewatering process itself as the conditioner for subsequent dewatering operations. The pyrolyzed iron sludge conditioner is produced on-site and used immediately, eliminating the need to purchase and transport external chemical conditioners.
Solution Approach 2:
The patent recovers the iron-containing material that would otherwise be discarded and uses it as a conditioner. This recovery process replaces the need for external reagent purchases and reduces transportation costs associated with importing chemical conditioners.
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 sludge composite conditioner effectively improves sludge dewatering performance, reduces waste, and promotes sustainable development by utilizing iron-rich residues, decreasing transportation and reagent costs, and enabling energy recycling from pyrolysis gases, thus addressing the inefficiencies in existing sludge treatment methods.
Implementation Method 1
The sludge pyrolysis technology is a technology in which the organic matter in the sludge is pyrolyzed by heating under the condition of no oxygen or oxygen deficiency
Implementation Method 2
The Fenton reagent advanced oxidation technology can effectively degrade organic matter by generating strong oxidizing groups such as hydroxyl radicals
Data Source
AI summary
The present disclosure discloses a sludge composite conditioner based on iron-containing sludge pyrolysis residue as well as a preparation method and use thereof. The sludge composite conditioner comprises iron-containing sludge pyrolysis residue and an oxidant used in combination with the iron-containing sludge pyrolysis residue, in which the iron-containing sludge pyrolysis residue is pyrolysis residue obtained by dewatering iron-containing sludge to obtain an iron-containing sludge cake and then pyrolyzing the iron-containing sludge cake, the iron-containing sludge being obtained from an advanced oxidation technology involving an iron-containing reagent. In the present disclosure, through improvements of the subsequent overall treatment process, the reuse mode and specific reaction condition parameters of the respective subsequent treatment process steps of the iron-containing sludge cake, the problem of sludge cake treatment and disposal at the end of the existing sludge treatment and disposal technology can be effectively solved compared with the prior art, and then the iron-containing sludge cake is utilized to form a composite conditioner for deep dewatering of sludge, which is recycled as a sludge conditioner for sludge treatment, thereby realizing the full utilization of resources.