Water Treatment Module with Gas-Permeable Membrane and Diffuser
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Solution Overview
Problem
Current water treatment technologies face inefficiencies in pollutant breakdown and biofilm management within water treatment reactors, particularly in maintaining effective aeration and preventing fouling, which can lead to reduced treatment performance and increased operational costs.
Innovation Solution
A water treatment module featuring an elongated gas enclosure with gas-permeable and water-impermeable membranes, where gas diffuses into the water to break down pollutants and a diffuser arrangement introduces gas streams to enhance turbulence and biofilm scouring, preventing clogging and improving treatment efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If gas-permeable membranes are used for aeration in water treatment reactors, then oxygen transfer efficiency is improved, but membrane fouling and clogging occur reducing treatment performance
Solution Approach 1:
The reactor is divided into multiple compartments with different functional zones. Gas-permeable membranes are selectively placed only in specific sections where aeration is most needed, rather than covering the entire reactor surface. This segmentation reduces the total membrane area exposed to fouling conditions while maintaining adequate oxygen transfer efficiency in critical treatment zones.
Solution Approach 2:
A hydrophilic coating layer is applied to the gas-permeable membranes to act as an intermediary barrier. This coating layer prevents organic matter and biofilm from directly adhering to the membrane pores, thereby reducing fouling and clogging while still allowing efficient oxygen and gas transfer to the water.
2Productivity
If biofilm is supported on membranes for treatment, then pollutant degradation is enhanced, but biofilm accumulation causes clogging and fouling
Solution Approach 1:
Different regions of the reactor are designed with different biofilm management strategies. In zones where high pollutant degradation is needed, biofilm-supporting structures are provided. In other zones, smooth non-fouling surfaces are used to prevent accumulation. This local differentiation allows the system to maximize pollutant breakdown efficiency in treatment zones while minimizing clogging in aeration and flow zones.
Solution Approach 2:
The system incorporates periodic hydraulic flushing and air scouring cycles that temporarily increase water flow and gas injection intensity. These periodic actions dislodge and remove accumulated biofilm from membrane surfaces before complete clogging occurs, maintaining pollutant degradation efficiency without requiring continuous high-energy input.
3Productivity
If aeration intensity is increased to improve treatment efficiency, then pollutant removal is enhanced, but energy consumption and operational costs increase
Solution Approach 1:
Biofilm is pre-cultivated on support structures in designated zones before actual wastewater treatment begins. This preliminary biofilm development creates an active biological catalyst that significantly enhances pollutant degradation efficiency. As a result, lower aeration intensities are needed during operation to achieve the same treatment efficiency, reducing energy consumption while maintaining 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
The solution enhances pollutant breakdown and biofilm management, improving treatment efficiency and reducing fouling, thereby increasing the effectiveness and cost-effectiveness of the water treatment process.
Implementation Method 1
gas diffuses into the water to break down pollutants
Implementation Method 2
a diffuser arrangement introduces gas streams to enhance turbulence and biofilm scouring
Data Source
AI summary
The present disclosure provides a water treatment module, a bioreactor comprising one or more of such modules and a receptive water treatment system. Also provided herein is a method making use of the above module, bioreactor and system. The water treatment module comprises (i) at least one elongated gas enclosure comprising a gas inlet and two vertical walls, at least one vertical wall comprising a water-impermeable and gas-permeable membrane having a water-facing side and a gas-facing side, the two vertical walls separating between water external to the enclosure and gas within the enclosure, the gas enclosure being in a rolled or folded configuration to thereby define a convoluted horizontal path and one or more water-treatment spaces formed between opposite water facing sides of the enclosure; and (ii) a diffuser arrangement comprising gas diffusers configured for introducing a stream of gas into the one or more water treatment spaces.