Membrane Filter for Wastewater Particulate Removal
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Solution Overview
Problem
Conventional wastewater treatment methods, including activated sludge and rotary aerators, struggle to effectively reduce particulates, such as BOD, total suspended solids, and phosphorous to desired levels, leading to inefficiencies and potential discharge of solids into treated effluent.
Innovation Solution
Integration of the activated sludge/fixed film process with a membrane filter, specifically using flat plate or hollow fiber membranes, which acts as a physical barrier to remove solid particles and bacteria, reducing electrical power consumption and enhancing process stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional activated sludge or fixed film processing steps are used, then biological decomposition occurs, but particulates cannot be reduced to desired levels (5 mg/L for BOD and total suspended solids)
Solution Approach 1:
The patent employs a membrane filter with specific pore sizes to physically separate particulates from treated wastewater. The membrane acts as a porous barrier that allows water to pass through while retaining suspended solids, achieving the required 5 mg/L particulate reduction level that biological processes alone cannot accomplish.
Solution Approach 2:
The invention combines biological treatment processes (activated sludge or fixed film) with physical membrane filtration in an integrated system. This merging of biological and physical separation mechanisms ensures both thorough organic matter decomposition and effective particulate removal, achieving consistent effluent quality.
2Manufacturing precision
If separate settling tanks or gravity clarifiers are used, then suspended solid particles are removed, but the devices are large and require significant space
Solution Approach 1:
The membrane filter replaces traditional gravity-based settling tanks with a porous membrane separation system. This membrane technology achieves equivalent or superior solid particle removal efficiency in a much more compact configuration, dramatically reducing the footprint required for the treatment facility.
Solution Approach 2:
The invention substitutes gravity-based mechanical settling with membrane-based physical separation. Instead of relying on gravitational forces to settle particles over large areas and extended time periods, the membrane filter provides immediate physical barrier separation in a compact unit.
3Manufacturing precision
If clarifiers are used to settle solids, then solids separation occurs, but conditions are not optimal for settling (low oxygen causes denitrification and gas lift, filamentous bacteria do not settle well, temperature changes cause overflow)
Solution Approach 1:
The membrane filter provides a physical barrier that is insensitive to operational conditions such as oxygen levels, temperature variations, and bacterial composition. Unlike clarifiers that rely on optimal settling conditions, the membrane consistently removes particulates regardless of these variable factors, ensuring stable performance during operational upsets.
Solution Approach 2:
The invention replaces the gravity-dependent clarifier system with a membrane filtration system that operates independently of settling conditions. This substitution eliminates vulnerabilities to denitrification gas lift, filamentous bacteria interference, and temperature-induced overflow problems.
4Manufacturing precision
If membranes are used for fine filtration, then solid particles are removed effectively, but membranes provide no aeration or biological treatment functionality
Solution Approach 1:
The patent integrates membrane filtration with biological treatment processes (activated sludge or fixed film systems) in a unified treatment train. The biological components handle organic matter decomposition while the membrane component provides final particulate removal, creating a versatile system that delivers both biological and physical treatment functions.
Solution Approach 2:
The integrated system achieves multi-functionality by combining biological degradation capabilities with physical separation capabilities. The treatment apparatus can simultaneously or sequentially perform organic matter decomposition, nutrient removal, and particulate filtration, making it a versatile solution for comprehensive wastewater treatment.
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 combination achieves significant reduction in BOD, total suspended solids, and phosphorous, ensuring virtually solid-free effluent, suitable for irrigation or aquifer recharge, with reduced space requirements and improved hydraulic flow resilience.
Implementation Method 1
a membrane filter for advanced wastewater treatment... acts as a physical barrier to remove solid particles and bacteria
Implementation Method 2
aerobic microbial decomposition... remove impurities including carbonaceous material, ammonia, nitrates and nitrites
Implementation Method 3
As the aerators reemerge from the surface of the wastewater, they catch air in specially profiled cells
Data Source
AI summary
A wastewater treatment method and apparatus including a denitrification (anoxic) chamber for denitrifying wastewater, an aeration basin with Bio-Wheel for aerating the wastewater, and a membrane device in which sludge particles are separated out of the wastewater, leaving clean discharge water and reusable sludge. Sludge from the membrane chamber floor is sent back to the aeration basin or denitrification chamber or both. Excess sludge is wasted or held for further processing. Preferably, the method and apparatus facilitate both activated sludge and fixed film processes.