Sludge Dewatering Camera Control Flocculant Dosage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for dewatering sludge are inefficient due to manual and error-prone flocculant dosage adjustments, leading to suboptimal dewatering performance and high flocculant consumption, as operators struggle to visually assess the correct flocculation status, resulting in either inadequate or excessive flocculant use.
Innovation Solution
A method and device that utilize a camera to measure the free surface area of a cleaned wire in the sludge inflow area, allowing for objective control of flocculant dosage through a control system, ensuring optimal dewatering performance by maintaining a constant free surface area and adjusting dosage in controlled steps to prevent flooding and minimize flocculant usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual visual assessment is used to determine flocculant dosage, then the method is simple to operate, but the measurement precision and reliability of flocculant dosage control deteriorates
Solution Approach 1:
The patent replaces manual visual assessment with an optical measurement system consisting of a camera and evaluation device. The camera captures images of the sludge layer on the belt, and the evaluation device automatically analyzes the images to determine rheological properties and control flocculant dosage, eliminating human subjectivity and improving measurement precision.
Solution Approach 2:
The patent creates an optical copy (image) of the sludge layer on the belt instead of directly measuring the physical sludge properties. The camera captures visual information about the sludge layer's appearance, which serves as a proxy for determining rheological properties and controlling flocculant dosage accurately.
2Difficulty of detecting and measuring
If high flocculant dosage is used to ensure visible streaks for measurement, then the measurement becomes possible, but the measurement precision deteriorates due to distortion and inaccuracies
Solution Approach 1:
The patent implements a feedback control system where the optical measurement device continuously monitors the sludge layer characteristics and the evaluation device processes this information to automatically adjust the flocculant dosage. This closed-loop feedback ensures that the dosage is optimized based on actual measured conditions rather than relying on pre-set values or visual estimation.
Solution Approach 2:
The patent changes the measurement parameter from direct visual detection of streaks to optical analysis of the sludge layer's rheological properties through camera imaging. By measuring parameters such as surface area, texture, and color characteristics of the sludge layer, the system can accurately determine flocculation status without requiring excessive flocculant dosage to create visible streaks.
3Measurement precision
If the control zone is located in the inflow area on the cleaned wire, then the measurement of free surface area becomes accurate and reliable, but the device complexity increases due to additional camera and control system components
Solution Approach 1:
The patent divides the wire into different functional zones: a control zone in the inflow area where the wire surface remains clean and free of sludge for accurate optical measurement, and a processing zone where sludge is applied and dewatering occurs. This segmentation allows the measurement function to be isolated in a controlled environment without interfering with the overall dewatering process.
Solution Approach 2:
The patent introduces an intermediary measurement system (camera and evaluation device) that acts as a mediator between the sludge processing system and the control system. This intermediary component enables non-contact optical measurement of the sludge layer properties without physically interfering with the sludge flow or requiring direct contact with the sludge, thereby maintaining measurement accuracy while managing 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 approach enables automatic, objective optimization of flocculant dosage, achieving optimal dewatering performance while reducing costs by ensuring the correct amount of flocculant is used, thereby improving operational efficiency and minimizing flocculant consumption.
Implementation Method 1
the rheological properties of the sludge on the wire are scanned optically
Implementation Method 2
the flocculant is added to the sludge in a first stage in order to cause the sludge to flocculate
Implementation Method 3
the sludge is applied to a wire, on a gravity table for example, so that the liquid in the sludge drains off through the wire
Data Source
AI summary
The invention relates to a method for the dewatering of sludge on a screen, wherein a flocculant is admixed with sludge, whereafter the sludge is at least partially dewatered, the flow behavior of the sludge on the screen being optically detected and the amount of flocculant to be admixed being set according to the free screen surface in a control region. The invention is primarily characterized in that the control region is arranged at a point of the cleaned screen in the inlet area of the sludge, for example at the edge. The invention also relates to a device for the dewatering of sludge, comprising a flocculant feed device and a screen downstream of the flocculant feed device, wherein a device, in particular a camera, is provided for optically detecting the flow behavior of the sludge and is connected via a control system to the flocculant feed device for regulating the amount of flocculant, said device being characterized in that the device (11), in particular the camera, is designed such that it detects a control region in the inlet area (10) of the cleaned screen. In this way, regulation can be achieved for an optimal feed amount of flocculant in a straightforward manner regardless of the material feed and the sludge type.