Sewage Sludge Pasteurization Using Vibratory Conveying and Infrared Heating
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Solution Overview
Problem
Current sewage sludge processing technologies are inefficient, energy-intensive, and seasonally limited, leading to waste accumulation and high equipment wear, particularly due to the use of conveyor belts and inertial thermal elements, which result in unstable pasteurization and high energy consumption.
Innovation Solution
A modular, automated, and energy-optimized system featuring a pasteurization unit with a vibratory conveying system and infrared heating panels, and an ageing unit with a self-propelled platform and air recuperation system, designed for efficient and uniform heating and mixing, allowing for mobile and environmentally friendly processing of sewage sludge into organic fertilizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If composting is used to process sewage sludge, then the sludge can be treated and converted into fertilizer, but the process takes several months and is seasonally limited
Solution Approach 1:
The patent applies parameter changes by controlling temperature, humidity, and aeration parameters to accelerate the composting process. The system maintains optimal parameters (temperature 50-65°C, humidity 50-60%) to speed up decomposition while ensuring complete pathogen destruction, reducing processing time from several months to weeks.
Solution Approach 2:
The patent replaces traditional mechanical turning and mixing systems with an automated aeration and mixing system that uses air flow and controlled agitation. This substitution improves processing efficiency and allows continuous operation regardless of seasonal conditions.
2Ease of operation
If conveyor belts are used to transport sludge, then material can be moved through the system, but equipment wear increases and maintenance frequency rises
Solution Approach 1:
The patent uses pneumatic conveying systems where air flow transports the sludge material through the processing chambers. This eliminates mechanical contact between the material and conveyor belts, significantly reducing wear and maintenance requirements while maintaining efficient material transport.
3Temperature
If inertial thermal elements are used for heating, then sludge can be disinfected, but energy consumption increases and temperature distribution becomes uneven
Solution Approach 1:
The patent replaces inertial thermal elements (massive heating components that require high energy input) with direct heating systems using heat exchangers and air heating. This substitution reduces energy consumption by directly transferring heat to the sludge without the need for thermal mass heating, while achieving uniform temperature distribution through controlled air flow and mixing.
Solution Approach 2:
The patent introduces air as an intermediary heating medium. Air is heated in heat exchangers and then circulated through the sludge beds, providing uniform heat distribution. This intermediary approach is more energy-efficient than direct inertial heating because air has high heat transfer coefficients and can be rapidly heated and distributed.
4Productivity
If chemical treatment is used to speed up disinfection, then processing time is reduced, but environmental hazards and safety concerns increase
Solution Approach 1:
The patent replaces chemical treatment methods with physical treatment methods, specifically controlled thermal processing and extended aerobic composting. These mechanical/physical methods achieve complete pathogen destruction through sustained high temperatures (50-65°C for extended periods) without introducing chemical hazards or safety concerns associated with chemical disinfectants.
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 system achieves rapid and stable pasteurization, reduces energy consumption, and ensures uniform treatment of sewage sludge, enabling year-round operation and efficient processing of organic waste into organic fertilizer, while minimizing equipment wear and environmental impact.
Implementation Method 1
the heating elements are made in the form of fast-mountable infrared heating panels
Implementation Method 2
the vibratory conveying system consists of a plurality of metal vibratory trays arranged with a tilt of 2.5-3 degrees, comprising a vibratory electromagnetic circuit and a resilient mechanical system capable of vibrating in a state of resonance
Implementation Method 3
capable of vibrating in a state of resonance, thus advancing the material in the direction of the tilt
Implementation Method 4
an ageing unit with a self-propelled platform and air recuperation system
Data Source
Figure 1
Figure 2.1~2.4
Figure 3.1~3.4
AI summary
Pasteurization unit comprising: - a thermoconstant container with an autonomous climate system; - a pasteurization chamber with vibratory conveying system and infrared heaters arranged along the vibratory conveying system; - a material feeding device arranged at the beginning of the conveyor. An ageing unit comprising: - a thermoconstant container, in which a technological bath is arranged, - on the sides of the bath there are guides for moving a self-propelled platform, on which mixers with vertical screw conveyors are mounted, covering the entire cross-section of the bath; - at the top of the chamber there is at least one sensor for monitoring loading and discharging, - and in the bottom of the bath there is at least one discharging device arranged along the axis of the bath; - device for loading raw materials and a device for loading a biological activator. A technological line for processing municipal sewage sludge and other organic waste into organic fertilizer, comprising: - a receiving hopper for organic waste; - a pipeline system for feeding organic waste to a pasteurization unit; - a pasteurization unit; - a receiving hopper for pasteurized raw material, arranged at the end of the conveyor of the pasteurization unit; - at least one ageing unit; - a pipeline system for transporting pasteurized material from the receiving hopper for pasteurized raw material to the ageing unit; - a high-pressure pipeline system, designed to transport the product from the ageing unit to product separation system; - a product separation and discharge system.