Calming Zone Lamellar Plates for Wastewater Sludge Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wastewater treatment systems face challenges in ensuring sufficient settlement of activated sludge on lamellar plates and safe reuse, due to turbulence and air bubble interference, leading to inefficient separation and potential clogging.
Innovation Solution
The system arranges lamellar plates in separate calming zones with inclined surfaces and controlled airflow, ensuring a laminar flow and safe return of activated sludge to the treatment process, with lamellar plates angled at ≥55° and a minimum vertical distance of 80-200 mm to prevent clogging, and aerators distributed across the aeration tank for uniform oxygen distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lamellar plates are arranged in the flow path of wastewater to separate activated sludge, then separation function is provided, but turbulence and air bubble interference occur leading to insufficient settlement
Solution Approach 1:
The system divides the wastewater treatment process into separate functional zones: an aeration tank for oxygen supply and mixing, and a dedicated calming zone for settlement. The calming zone is further segmented into an inlet area with flow distribution and a settlement area with lamellar plates, isolating the settlement function from turbulence-generating components.
Solution Approach 2:
The settlement function is extracted from the aeration tank and placed in a separate calming zone. This removes the harmful turbulence and air bubble interference from the settlement area, allowing lamellar plates to operate in a quiescent environment optimized for sludge deposition.
2Stability of the object's composition
If activated sludge tank is turbulent and pushed forward by agitators to prevent sludge settling, then activated sludge remains suspended, but separation efficiency decreases due to continued turbulence between lamellar plates
Solution Approach 1:
The system separates the suspension function (performed by agitators in the aeration tank) from the settlement function (performed by lamellar plates in the calming zone). This spatial segmentation allows both functions to operate effectively without interfering with each other.
Solution Approach 2:
The calming zone acts as an intermediary between the turbulent aeration tank and the settlement area with lamellar plates. It provides a transition zone where turbulence dissipates before wastewater reaches the lamellar plates, enabling effective separation.
3Reliability
If path length between lamellar plates is increased to ensure sludge settlement, then settlement time is improved, but device complexity and space requirements increase
Solution Approach 1:
Instead of increasing the horizontal path length between lamellar plates, the system utilizes the vertical dimension by arranging multiple lamellar plates at angles. This creates multiple settlement surfaces within a compact footprint, dramatically increasing the effective settlement area without proportionally increasing the tank volume.
Solution Approach 2:
The settlement function is distributed across multiple inclined lamellar plates rather than relying on a single long path. Each plate provides independent settlement surfaces, and the collective effect of multiple plates achieves complete sludge removal in a compact space.
4Productivity
If lamellar plates are inclined at greater angles to promote sludge sliding off, then sludge return efficiency is improved, but clogging risk between plates increases
Solution Approach 1:
The system optimizes the inclination angle parameter of lamellar plates to a specific range that balances two competing requirements: sufficiently steep to promote sludge sliding off the plates, but not so steep that it causes clogging between plates. This parameter optimization resolves the contradiction between sludge return efficiency and clogging prevention.
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 configuration ensures effective settlement and return of activated sludge, increasing dry matter content and improving separation efficiency while preventing clogging and turbulence, allowing for better treatment outcomes with reduced space requirements.
Implementation Method 1
oxygen to enable bacterial growth... the wastewater is guided through a round or rectangular activated sludge tank and, in order to prevent the activated sludge from settling in the activated sludge tank, it is turbulent and 'pushed forward' in the direction of flow, above all by agitators or similar drive mechanisms
Implementation Method 2
the sludge settles on it... the path between the lamellar plates must be long enough to ensure that the sludge settles... the activated sludge is separated on the lamellar plates
Implementation Method 3
the activated sludge that has slipped down is safely returned to the wastewater treatment process via the sloping floor plate of the calming zone and the sloping base wall of the openings in the partition wall... the lamellar plates are inclined at an angle of at least 55°
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
For wastewater treatment in an aeration basin 2, the necessary sludge separators 5 with their inclined lamellar plates 6, 7, 8 are provided for in a separate calming zone 10, which is arranged separately from the aeration basin 2. This calming zone 10 is connected to the aeration basin 2 via openings 17, 18 and inlet openings 20/11 in the partition wall 16, so that the inflow of the wastewater/activated sludge mixture 3, 3' to the calming zone 10 and the sludge separators 5 located therein can occur without turbulence or air bubbles.