High-Pressure Plate Compression for Material Dewatering
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Solution Overview
Problem
Existing systems face challenges in mechanically dewatering biosolids and organic/inorganic materials to high solids concentrations efficiently and cost-effectively, as thermal drying methods are costly and reduce nutrient value in feed additives.
Innovation Solution
A mechanical dewatering system using high-pressure compression with hydraulically actuated plates and woven mesh belts to increase solids percentage from 15-25% to 30-45%, reducing moisture content to 55-75% without thermal energy, and optionally incorporating polymer addition for enhanced throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal drying methods are used to remove water from material, then water removal efficiency is improved, but operating cost increases significantly
Solution Approach 1:
The patent replaces thermal drying systems with a mechanical dewatering system consisting of a belt press, centrifuge, or screw press. This mechanical approach physically separates water from material through mechanical forces (centrifugal force, compression, or screw extrusion) rather than thermal energy, achieving comparable water removal efficiency at significantly lower operating costs of $0.01-$0.02 per gallon versus $0.10-$0.20 per gallon for thermal drying
Solution Approach 2:
The patent incorporates a polymer addition system with hydraulic or pneumatic delivery mechanisms to enhance the dewatering process. The polymer is injected into the sludge to improve water separation, and the system uses hydraulic pressure to force material through the belt press or centrifuge, optimizing water removal while maintaining low energy consumption
2Quantity of substance
If thermal drying is used to achieve high solids concentration, then solids percentage increases, but nutrient value in feed additives deteriorates
Solution Approach 1:
The patent uses mechanical dewatering methods (belt press, centrifuge, screw press) instead of thermal drying to achieve high solids concentration (30-45%). These mechanical processes physically separate water from material without applying heat, thereby preserving heat-sensitive nutrients and organic compounds in feed additives while achieving the desired solids concentration
3Use of energy by moving object
If conventional mechanical dewatering is used, then operating cost is reduced, but water removal efficiency is insufficient
Solution Approach 1:
The patent applies polymer addition as a preliminary action before mechanical dewatering. The polymer is mixed with the sludge to flocculate particles and improve water separation, making the subsequent mechanical dewatering process more effective. This pre-treatment enables conventional mechanical systems to achieve water removal efficiency comparable to expensive thermal systems while maintaining low operating costs
Solution Approach 2:
The patent creates a composite system combining polymer chemicals with mechanical dewatering equipment (belt press, centrifuge, or screw press). The polymer-modified sludge undergoes mechanical separation, creating a composite approach that enhances water removal efficiency beyond what either method could achieve alone, while keeping operating costs low through the use of inexpensive mechanical equipment
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
Reduces dewatering costs to 10% of thermal systems, halves transportation volume and weight, and maintains nutrient value in feed additives, achieving 30% solids concentration at $0.01 per gallon.
Implementation Method 1
Hydraulically actuated plates exert high pressure forces on the material to press additional water out of the material
Implementation Method 2
The inventions mechanically compress the material (sludge) to remove water from the material that cannot be extracted through conventional means
Implementation Method 3
A belt transports material on a woven mesh belt to a compression zone
Data Source
AI summary
A system for dewatering a material comprising a slitter, wherein the slitter receives the material, separates the material into a plurality of clumps, and deposits the plurality of clumps of material substantially evenly on a conveyor belt. The conveyor belt is partially porous to allow water to pass through but preventing material from passing through. The conveyor belt is operable to convey the material from the slitter to a compression zone; the compression zone comprises at least one high pressure press. The compression plates engages the material positioned on the conveyor belt. At least one knife positioned proximate the at least one compression plate operable to remove material from the bottom surface of the at least one compression plate after a compression cycle; and at least one drain positioned under the conveyor belt to carry water removed from the material away from the conveyor belt.