PLC-Controlled MBR Membrane Washing with Rotating Hood
Solution Overview
Problem
Existing membrane bioreactors face challenges with difficult manual operation, incomplete cleaning, and poor recovery performance during off-line washing, which hampers efficient sewage treatment.
Innovation Solution
An automatic off-line gas-water combined-washing membrane bioreactor system utilizing a PLC automation control cabinet, a rotating hood with a washing pipe network, and a lifting device for complete 360° washing without dead angles, allowing for flexible gas-water combined-washing modes controlled by a PLC system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual operation is used for membrane washing, then operational simplicity is maintained, but cleaning completeness and recovery performance deteriorate
Solution Approach 1:
The system enables automatic self-washing of the membrane assembly through PLC-controlled pumping systems that circulate washing liquid through the membrane modules, eliminating the need for manual disassembly and cleaning while ensuring thorough cleaning of all membrane surfaces
Solution Approach 2:
The washing system is designed to handle multiple washing modes (backwashing, chemical cleaning, disinfection) using a unified PLC-controlled platform that can automatically switch between different washing protocols and adjust parameters based on the selected mode
2Reliability
If complex washing systems are implemented, then cleaning effectiveness is improved, but device complexity increases
Solution Approach 1:
Manual mechanical cleaning operations are replaced by an automated PLC-controlled pumping and circulation system that uses fluid dynamics to achieve thorough cleaning without requiring complex mechanical disassembly mechanisms or manual intervention
Solution Approach 2:
Multiple washing functions (backwashing, chemical cleaning, disinfection, rinsing) are merged into a single integrated washing station that uses one membrane assembly housed in a reactor vessel, combining several cleaning operations into one unified system
3Extent of automation
If automated control systems are added, then operational automation is improved, but device complexity increases
Solution Approach 1:
The PLC control system incorporates feedback mechanisms through sensors that monitor parameters such as pressure differential, flow rate, and chemical concentration, automatically adjusting washing parameters based on real-time system status to optimize cleaning while simplifying operator intervention
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 system enables fully automated, efficient, and complete membrane cleaning with reduced manual labor, ensuring thorough washing and flexible washing modes, thereby enhancing the membrane bioreactor's cleaning performance and reducing operational loads.
Implementation Method 1
the nozzles can produce a reactive thrust applied to drive the rotating hood to rotate along the annular guide rail when ejecting gas or water
Implementation Method 2
the gas washing pipe is externally connected with a gas pump, the water washing pipe is externally connected with a water pump
Implementation Method 3
the water washing pipe is externally connected with a water pump
Implementation Method 4
the external interface is connected with a gas washing pipe and a water washing pipe by a three-way change valve
Data Source
AI summary
The invention discloses an automatic off-line gas-water combined-washing membrane bioreactor, comprising a PLC automation control cabinet, a MBR reactor, a MBR membrane assembly, a rotating hood, an annular guide rail, a lifting device, a washing pipe network, an external interface, a gas washing pipe, a water washing pipe, a gas pump and a water pump, wherein the gas pump, the water pump and the three-way change valve are all connected with the PLC automation control cabinet, the washing pipe network is provided with several nozzles. The present invention adopts a full PLC automation control system, the PLC automation control cabinet controls a pressure washing pump (gas pump and water pump), and gas or water is injected into the washing pipe network by flexibly adjusting the three-way change valve, so that the operation is simple, the cleaning is complete, and the manual operation load is reduced.