Self-Circulating Denitrification Device Using Aeration Pressure
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Solution Overview
Problem
Existing sewage treatment processes for denitrification and dephosphorization are energy-inefficient due to reliance on conventional circulating pumps and face challenges in maintaining micro-aerobic environments and preventing sludge deposition, leading to increased energy consumption and safety hazards.
Innovation Solution
A self-circulating high-efficiency biological denitrification device with an aerobic zone, anoxic zone, and sludge zone arranged vertically, utilizing a unique guide plate and single-hole membrane aerator to achieve nitrification liquid and sludge return without a circulating pump, reducing energy consumption and optimizing structural design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional circulating pump is used for water and sludge circulation, then the denitrification process can be maintained, but energy consumption increases significantly
Solution Approach 1:
The system uses the aeration system's own exhaust gas pressure to drive liquid circulation through the anoxic zone, and uses negative pressure suction to return sludge, eliminating the need for separate circulating pumps. The aeration system serves dual purposes: oxygen supply and circulation driving force
Solution Approach 2:
The aeration system is designed to perform multiple functions simultaneously: providing oxygen for nitrification, creating positive pressure for nitrification liquid return to anoxic zone, and creating negative pressure for sludge return, replacing multiple dedicated systems with one multi-functional system
2Object-affected harmful factors
If the upflow velocity inside the reactor is increased to keep sludge suspended, then sludge deposition is prevented, but the slenderness ratio or internal circulation volume must be improved which increases safety hazards or energy consumption
Solution Approach 1:
The reactor is divided into distinct functional zones (aerobic zone with filler for nitrification, anoxic zone for denitrification, settling zone) with clear separation. This segmentation allows each zone to operate under optimal conditions without requiring high upflow velocities throughout the entire reactor, reducing safety hazards
Solution Approach 2:
The system transitions from horizontal series connection to vertical stacking of functional zones. The aerobic zone is positioned above the anoxic zone, allowing gravity-assisted flow and eliminating the need for high upflow velocities to maintain sludge suspension, thereby reducing safety hazards
3Object-affected harmful factors
If the internal circulation volume is increased to maintain specified upflow velocity, then sludge suspension is improved, but energy consumption increases
Solution Approach 1:
The aeration system's exhaust gas pressure automatically drives the circulation of nitrification liquid and sludge without requiring additional energy input for circulation pumps. The system uses its own operational byproducts (exhaust gas pressure and negative pressure zones) to maintain circulation
Solution Approach 2:
The system utilizes pneumatic pressure differentials created during aeration to drive hydraulic circulation. The positive pressure from aeration exhaust drives liquid flow, while negative pressure zones enable sludge return, replacing mechanical pump systems with pneumatic-hydraulic coupling
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 reduces energy consumption, enhances oxygen utilization, and maintains effective sludge and nitrogen removal, achieving efficient denitrification and dephosphorization while minimizing sludge accumulation and safety risks.
Implementation Method 1
aerator that utilizes exhaust gas pressure to return nitrification liquid
Implementation Method 2
aerator that utilizes exhaust gas pressure to return nitrification liquid and negative pressure suction to return sludge
Implementation Method 3
aerator provided at a bottom of the aerobic zone
Data Source
AI summary
A self-circulating high-efficiency biological denitrification device includes a tank body, where an aerobic zone, an anoxic zone, a settling tank water distribution zone, a sludge zone, a sludge-water separation zone, and an effluent flow stabilization zone are arranged from bottom to top in the tank body; the settling tank water distribution zone includes a settling tank influent guide cylinder, and a circular butterfly jet water distributor is arranged between the settling tank influent guide cylinder and the aerobic zone; the settling tank influent guide cylinder is connected to a guide plate arranged in the aerobic zone, the anaerobic zone, and the sludge zone; the guide plate includes three sections; a nitrification liquid return gap and a sludge return gap are formed; a bottom of the aerobic zone is provided with an aerator; the aerator is connected to an air inlet pipe located outside the tank body.