Rotating Filter Drum Water Purification
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Solution Overview
Problem
Current water treatment methods face challenges in maximizing contact between active particulate material and water, preventing losses of active particulate material, ensuring stable treatment processes, reducing idle times, and minimizing operating costs, particularly due to issues with decantation and clogging in existing separation techniques.
Innovation Solution
A method involving a stirred contact tank with continuous extraction and separation using a rotating filter drum to trap active particulate material, allowing for efficient contact and separation, and a washing process to maintain constant particulate material concentration without the need for coagulants or flocculents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If decantation is used to separate active particulate material from treated water, then separation is achieved, but active particulate material is lost and downstream filtering units clog more rapidly
Solution Approach 1:
The patent employs a porous separation membrane with controlled pore sizes to physically retain active particulate material while allowing treated water to pass through. The membrane's pore structure is specifically designed to prevent particulate material loss unlike decantation, thereby resolving the contradiction between achieving separation and preventing material loss
Solution Approach 2:
The patent replaces the mechanical decantation process with a membrane filtration system that uses physical barrier properties rather than gravitational settling. This substitution eliminates the need for polymer ballasting and reduces particulate material loss while maintaining separation effectiveness
2Loss of substance
If screen separation is used to prevent active particulate material loss, then material loss is reduced, but the screen clogs rapidly requiring regular cleaning that stops production
Solution Approach 1:
The patent implements a dynamic membrane system that can be adjusted or replaced without stopping production. The membrane module is designed to allow continuous operation with periodic maintenance that does not require production shutdown, resolving the contradiction between preventing material loss and maintaining productivity
Solution Approach 2:
The patent employs a membrane system that can be easily replaced or regenerated. When the membrane becomes fouled, it can be discarded or regenerated without affecting the continuous operation of the water treatment process, thus maintaining productivity while preventing particulate material loss
3Ease of operation
If polymer is added to ballast PAC for decantation, then separation is facilitated, but operating costs increase and environmental impact worsens
Solution Approach 1:
The patent extracts or removes the need for polymer additives from the water treatment process by using membrane separation. The membrane physically performs the separation function that previously required chemical ballasting, eliminating harmful chemical discharge and reducing operating costs associated with polymer purchase and disposal
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 approach enhances treatment efficiency, prevents active particulate material loss, reduces clogging, maintains constant concentration, and decreases operating costs by continuously separating and recycling the active material, thereby improving productivity and environmental impact.
Implementation Method 1
filtering said mixture through said rotating filter drum so as to trap said active particulate material inside said drum
Implementation Method 2
A lower part of a porous rotating cylinder containing ion-exchange resins effects a paddling action in this tank. The water to be treated enters the cylinder, comes into contact with the ion-exchange ions that are housed therein, then comes out of the cylinder
Implementation Method 3
comes into contact with the ion-exchange ions that are housed therein
Implementation Method 4
putting the water to be treated into contact, within a stirred contact tank, with an active particulate material
Data Source
AI summary
The invention relates to a method for treating water laden with pollutants for the purpose of making the water drinkable, said method including: an elimination step consisting of contacting said water laden with pollutants, within a stirred contact tank (2), with an active particulate material (19) using a predetermined concentration of the active particulate material (19) in said water; an extraction step consisting of continuously extracting from said contact tank (2) a mixture consisting of water and of active particulate material (19); a separation step consisting of continuously separating said active particulate material (19) from said mixture. According to the invention, the separation step consists in particular of feeding the mixture of water and active particulate material into a filter drum (4).