Submerged Lifting Bio-Membrane Filter for Sewage Treatment
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Solution Overview
Problem
Rotating biological contactors (RBCs) face limitations due to high manufacturing costs, limited shaft and disk sizes, complex structure, and reduced treatment capacity, primarily due to strength and material constraints, which affect their efficiency and cost-effectiveness in sewage treatment.
Innovation Solution
A submerged lifting circulation type bio-membrane filter system with symmetrically staggered filter curtains that periodically lift and lower to absorb organic matter and oxygen, utilizing a thermal insulation shed and induced draft fan for odor control and oxygen distribution, eliminating the need for aeration and sludge reflux, and featuring a rectangular biofilter structure with serrated partition plates for efficient sewage treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the shaft length of RBC is increased to mount more blades, then the treatment capacity is improved, but the manufacturing cost and processing difficulty increase significantly
Solution Approach 1:
The RBC system is divided into multiple independent short shafts, each supporting a limited number of blades. This segmentation allows each shaft to be manufactured separately with standard lengths, avoiding the need for expensive long shafts while collectively providing the required treatment capacity through parallel operation of multiple units.
2Productivity
If the diameter of the disk is increased to provide larger specific surface area, then the treatment capacity is improved, but the disk strength is insufficient causing flex and deformation
Solution Approach 1:
Instead of using one large-diameter disk, the system employs multiple smaller-diameter disks distributed across several shafts. Each small disk maintains sufficient structural strength and avoids deformation, while the collective surface area of all disks provides the required treatment capacity.
3Productivity
If semi-circular or trapezoidal contact reaction tanks are used to avoid dead corners, then the treatment efficiency is improved, but the manufacturing cost increases
Solution Approach 1:
The system uses rectangular tanks with rotating RBC assemblies that dynamically reach into corner regions. The rotational motion of the disks and blades ensures that water circulation and treatment action extend into corners that would be dead zones in static configurations, achieving efficient use of rectangular tank geometry without requiring expensive custom-shaped tanks.
4Ease of manufacture
If the RBC structure is used with limited shaft length, then the manufacturing cost is reduced, but the treatment capacity is severely limited
Solution Approach 1:
Multiple RBC units with standard-length shafts are combined in parallel within a single tank or across multiple tanks. Each unit operates independently with its own shaft and disks, but collectively they provide the aggregate treatment capacity of a single large-system RBC, achieving both cost-effectiveness and high productivity.
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 solution reduces energy consumption, eliminates sludge bulking, simplifies operation, increases treatment capacity, and lowers costs by allowing for larger effective treatment areas and uniform submerge rates across stages, without the need for complex mechanical devices or secondary sedimentation tanks.
Implementation Method 1
bio-membranes on the two groups of filter curtains are in contact with the atmosphere and sewage in turns, absorb organic matters in the sewage when lifting down for submerging, absorb oxygen when lifting up and exposing into the atmosphere
Implementation Method 2
absorb oxygen when lifting up and exposing into the atmosphere, and bring oxygen into the sewage
Implementation Method 3
bring oxygen into the sewage and cause sewage turbulence in a water tank when lifting down for submerging again, so that the dissolved oxygen is uniformly distributed
Data Source
AI summary
The present invention discloses a treatment process for a submerged lifting circulation type bio-membrane filter, wherein the treatment process comprises the following steps: two groups of symmetrically staggered filter curtains (2A and 2B) are adopted; the two groups of filter curtains (2A and 2B) are periodically lifted up and down in a reciprocating manner in a biofilter (1) under the action of a lifting mechanism (4), so that bio-membranes on the two groups of filter curtains (2A and 2B) are in contact with the atmosphere and sewage in turns, absorb organic matters in the sewage when lifting down for submerging, absorb oxygen when lifting up and exposing into to the atmosphere, and bring oxygen into the sewage and cause sewage turbulence in a water tank when lifting down for submerging again, so that the dissolved oxygen is uniformly distributed, thereby purifying the sewage.