Membrane Abrasion Protection via Particulate Polymer Shield
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Solution Overview
Problem
Current water treatment methods using powdered activated carbon (PAC) in membrane filtration systems face issues such as membrane clogging, abrasive wear, and frequent replacement due to PAC's abrasive nature, leading to increased energy consumption and costs.
Innovation Solution
Incorporating a particulate polymer material with specific characteristics into the membrane reactor to create a protective shield around the filtration membranes, reducing abrasion and clogging, and optimizing the suspension of adsorbent materials for improved treatment efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If powdered activated carbon (PAC) is used in membrane filtration systems, then adsorption of pollutants is improved, but membrane abrasion and clogging increase
Solution Approach 1:
The patent introduces a protective coating layer on the membrane surface that acts as an intermediary between the PAC particles and the membrane. This coating allows PAC to remain in the system for effective adsorption while preventing direct contact between PAC and the membrane, thereby reducing abrasion and extending membrane lifespan
Solution Approach 2:
The protective coating is applied beforehand to the membrane surface to cushion against the abrasive action of PAC particles. This pre-protection mechanism ensures that when PAC is introduced into the system, the membrane is already shielded, preventing damage before it occurs
2Productivity
If PAC concentration is increased to improve treatment efficiency, then pollutant removal is enhanced, but membrane clogging worsens
Solution Approach 1:
The protective coating serves as a mediator that allows higher PAC concentrations to be used without increasing clogging. The coating creates a barrier that prevents PAC particles from penetrating and blocking membrane pores, enabling the system to operate at higher PAC levels for improved treatment efficiency
Solution Approach 2:
The invention changes the physical-chemical parameters of the membrane surface by applying a protective coating with different properties than the base membrane. This parameter change allows the system to tolerate higher PAC concentrations that would otherwise cause clogging, thus enabling higher productivity
3Reliability
If frequent membrane replacement is performed to maintain filtration efficiency, then water quality is maintained, but operational costs and downtime increase
Solution Approach 1:
The protective coating is applied beforehand to prevent abrasion damage, significantly extending membrane service life. This pre-protection reduces the frequency of membrane replacement, thereby minimizing operational downtime and maintaining continuous filtration efficiency over longer periods
Solution Approach 2:
Instead of replacing membranes at standard intervals, the protective coating enables extended operation beyond typical service life limits. This excessive action approach allows membranes to operate longer than conventional systems, reducing replacement frequency and associated downtime
4Productivity
If chemical washing is performed to declog membranes, then filtration flow is restored, but PAC adsorption capacity is reduced
Solution Approach 1:
The protective coating acts as a sacrificial intermediary layer that accumulates contaminants instead of the membrane itself. During chemical washing, the coating can be cleaned or replaced without affecting the membrane, and PAC adsorption capacity is restored by simply replenishing PAC rather than intensive chemical 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 method extends membrane lifespan, reduces chemical usage and energy consumption, and maintains water quality, achieving reproducible and efficient treatment without the need for frequent membrane replacement.
Implementation Method 1
the adsorbent powdery material, combined with the injection of air into the filtration membranes and/or the chemical products used for the de-clogging, tends to have an abrasive action on the surface of the membranes
Implementation Method 2
the water to be treated is put into contact with an absorbent powdery material such as powdered activated carbon (PAC), ion-exchanging resins or zeolites. Through their porosity and high capacity of absorption, the adsorbent powdery materials enable the fixing or adsorption of the pollutant
Implementation Method 3
the membranes used in this context can especially be a nanofiltration membranes or ultrafiltration membranes or microfiltration membranes
Data Source
AI summary
Method for treating water comprising: a step for putting said water into contact with an adsorbent powdery material in a concentration of 0.1 to 5 g/L in a membrane reactor containing at least one submerged filtration membrane; a step of filtration by submerged membrane of said water containing said adsorbent powdery material in said membrane reactor, said membrane being at least partly constituted by an organic material; characterized in that it includes steps aimed at limiting the abrasion of said at least one submerged membrane by said adsorbent powdery material, said steps consisting in: putting said water containing said adsorbent powdery material into contact, in said membrane reactor, with a particulate polymer material constituted by particles in a concentration of 1 g/L to 10 g/L, said particles having an average diameter of 1 mm to 5 mm and a density of 1.05 to 1.5; and stirring said mixture constituted by water, adsorbent powdery material and particulate polymer material within said membrane reactor containing said at least one filtration membrane.