Dynamic Membrane Reactor for Simultaneous Nitrogen and Phosphorus Removal
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Solution Overview
Problem
Traditional wastewater treatment methods for dephosphorization and denitrification are inefficient, requiring costly chemical agents and suffering from membrane fouling, and lack effective simultaneous nitrogen and phosphorus removal capabilities.
Innovation Solution
A dynamic membrane reactor combining electrocoagulation technology with dynamic membrane filtration, utilizing metal ions to enhance biological flocculation and featuring a titanium mesh dynamic membrane, which is loaded with aerobic denitrifying bacteria to achieve efficient denitrification and dephosphorization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional chemical dephosphorization methods are used, then phosphorus removal is achieved, but operation cost increases due to chemical agent addition and excess sludge disposal
Solution Approach 1:
The system uses endogenous phosphorus-accumulating organisms in the activated sludge to perform biological dephosphorization, eliminating the need for external chemical phosphorus removal agents. The microorganisms naturally accumulate phosphorus and are subsequently removed with the waste sludge, achieving cost-effective phosphorus removal.
Solution Approach 2:
The patent replaces chemical dephosphorization with a biological system that uses living microorganisms to perform phosphorus removal. This substitution eliminates chemical agent addition and reduces sludge disposal costs while maintaining effective phosphorus removal.
2Manufacturing precision
If traditional membrane separation technology is used for solid-liquid separation, then separation efficiency is improved, but membrane fouling occurs and operational stability deteriorates
Solution Approach 1:
The patent employs a dynamic membrane that can be adjusted and regenerated in situ through hydraulic flushing and air stripping. The membrane's pore structure and permeability can be dynamically modified to maintain separation efficiency while preventing fouling accumulation, thereby improving operational stability.
Solution Approach 2:
The system periodically discards accumulated fouling layers from the membrane surface through hydraulic flushing and air stripping processes. This recovery mechanism restores membrane permeability and extends operational life without requiring membrane replacement, maintaining both separation efficiency and reliability.
3Quantity of substance
If precipitation method is used for solid-liquid separation, then separation is achieved, but treatment process length increases and area coverage expands
Solution Approach 1:
The patent combines biological dephosphorization, denitrification, and solid-liquid separation into a single integrated reactor system. The dynamic membrane performs both filtration and supports biological processes, eliminating the need for separate treatment stages and reducing overall process time and space requirements.
Solution Approach 2:
The dynamic membrane serves multiple functions simultaneously: it acts as a filtration medium for solid-liquid separation, a support structure for biofilm attachment, and a catalyst surface for denitrification. This multi-functionality consolidates multiple treatment processes into one unit, reducing treatment time and footprint.
4Manufacturing precision
If electrocoagulation technology is combined with dynamic membrane filtration, then biological flocculation is strengthened and filtration performance is improved, but device complexity increases
Solution Approach 1:
The patent integrates electrocoagulation electrodes directly into the dynamic membrane module structure. The electrodes are positioned within the membrane support layers, allowing electrochemical flocculation to occur in situ with the filtration process, thereby enhancing performance without adding separate equipment.
Solution Approach 2:
The dynamic membrane module serves dual purposes: it performs mechanical filtration through its porous structure and simultaneously provides electrocoagulation functionality through embedded electrodes. This multi-functionality improves flocculation and filtration performance while avoiding the need for separate electrocoagulation equipment, thus limiting the increase in device complexity.
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 reactor achieves high automation, prolonged membrane cleaning periods, and simultaneous denitrification and dephosphorization, reducing operational costs and improving water quality with denitrification rates up to 76.6% and dephosphorization rates up to 98.5%.
Implementation Method 1
The metal electrode is served as an anode of an electrolysis reaction, active metal ions are generated after electrolysis
Implementation Method 2
the metal ions and hydroxide in the water form generate a high-efficiency flocculant
Implementation Method 3
A dynamic membrane refers to a mud cake formed on the surface of a base mesh through a mixed solution or a precoating agent in a reaction tank
Implementation Method 4
hydrogen generated by the cathode can be served as an electron donor of denitrifying bacteria
Implementation Method 5
the oxygen generated by the anode can be served as an electron acceptor for nitrifying bacteria
Implementation Method 6
aerobic denitrifying bacteria are inoculated into the dynamic membrane reactor, efficient denitrification and dephosphorization are realized
Implementation Method 7
both dephosphorization and denitrification are required while organic matter degradation and suspended matter removal are completed
Data Source
AI summary
The invention provides a dynamic membrane reactor with function of nitrogen and phosphorus removal and an operation method thereof, and comprises a biological treatment system, a dynamic membrane loading system and an automatic system. The operation method comprises the following steps. (1) Before the formation of dynamic membrane, a porous filter for phosphorus removal is used as a cathode, a conductive precision filter screen is used as an anode, and aerobic denitrifying bacteria are inoculated into the dynamic membrane reactor under certain constant current density, hydraulic retention time and flux. (2) After the dynamic membrane is formed, the porous filter for phosphorus removal is used as the anode, the conductive precision filter screen is used as the cathode. And intermittent aeration is started at the anode under certain constant current density. (3) When the transmembrane pressure difference exceeds a certain range, hydraulic backwashing is performed under certain constant current density.