Septic Tank with Flow Inducers for Wastewater Reoxygenation
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Solution Overview
Problem
Conventional septic tanks face inefficiencies due to limited oxygen circulation, which restricts the treatment capacity and leads to incomplete wastewater treatment, often requiring secondary treatment systems that are complex and costly.
Innovation Solution
The septic tank design incorporates multiple compartments with ascending and descending flow vaults and flow inducers that reoxygenate wastewater at various stages, promoting extended nitrification-denitrification cycles and minimizing agitation, allowing for passive oxygenation and enhanced biological treatment within the tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional septic tanks are used with limited oxygen circulation, then the system is simple in structure, but the treatment capacity is insufficient and wastewater treatment is incomplete
Solution Approach 1:
The septic tank is divided into multiple compartments (first compartment, second compartment, third compartment) with distinct functions. The first compartment handles initial settling and anaerobic digestion, the second compartment performs aerobic treatment with oxygen circulation, and the third compartment provides final settling. This segmentation allows each compartment to specialize in specific treatment processes, increasing overall treatment capacity while maintaining manageable system complexity.
Solution Approach 2:
The system employs periodic oxygen circulation through the second compartment using an air pump that operates in cycles. This periodic aeration creates alternating aerobic and anaerobic conditions that promote nitrification-denitrification cycles, enhancing treatment effectiveness without requiring continuous energy input or complex control systems.
2Reliability
If secondary treatment systems are added to achieve complete wastewater treatment, then treatment effectiveness improves, but system complexity and cost increase
Solution Approach 1:
The invention integrates multiple treatment functions (anaerobic digestion, aerobic treatment, nitrification, denitrification, and settling) within a single septic tank structure with three compartments. This merging of functions eliminates the need for separate secondary treatment systems while achieving complete wastewater treatment, thereby maintaining high reliability without increasing system complexity.
Solution Approach 2:
The second compartment serves multiple functions: it acts as an aerobic treatment zone with oxygen circulation, a nitrification reactor, a denitrification zone during anoxic periods, and a buffer between the anaerobic first compartment and the final settling third compartment. This multi-functionality achieves comprehensive treatment effectiveness while avoiding the need for additional specialized equipment.
3Use of energy by moving object
If multiple compartments with flow vaults and flow inducers are added for reoxygenation, then oxygen circulation and biological treatment are enhanced, but the tank structure becomes more complex
Solution Approach 1:
The system uses pneumatic principles with an air pump to deliver oxygen to the second compartment through diffusers or aerators. This creates natural convection currents and flow patterns that enhance oxygen circulation and mixing without requiring mechanical mixers or complex pumping systems. The hydraulic design of the flow vaults and inducers leverages gravity and pressure differentials to maintain flow without additional energy input.
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 design achieves more complete wastewater treatment with fewer secondary treatment needs, meeting stringent performance standards without the need for expensive additional systems, as demonstrated by improved BOD, TSS, and fecal coliform bacteria reduction.
Implementation Method 1
flow inducers that reoxygenate wastewater at various stages
Implementation Method 2
promoting extended nitrification-denitrification cycles
Implementation Method 3
promoting extended nitrification-denitrification cycles
Implementation Method 4
Aerobic and anaerobic bacteria work to decompose solids and other organic materials
Implementation Method 5
promoting extended nitrification-denitrification cycles
Data Source
AI summary
A septic system is provided that includes a septic tank having a plurality of compartments with a tank inlet in a first compartment. First and second vaults are positioned in a second compartment. The first vault receives fluid from the first compartment at a level near a fluid surface in the tank. A first flow inducer receives fluid from the first vault at a level near a bottom of the first vault, and releases fluid into the second compartment at a level near the fluid surface. The second vault receives fluid from the second compartment at a level near a bottom of the second vault and discharge fluid at a level near the fluid surface. Third and fourth vaults and a second flow inducer are positioned in a third compartment, the third vault receiving fluid from the second vault, and the fourth vault discharging fluid to a tank outlet.