Modular Bioretention Pond with Pyrite Layers for Stormwater N and P Removal
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Solution Overview
Problem
Existing bioretention ponds in mountainous cities struggle to effectively remove nitrogen and phosphorus pollutants from stormwater due to lack of a quantitative decision method for substrate proportioning and ineffective substrate adaptation to local conditions, leading to reduced pollutant removal capacity.
Innovation Solution
An assembled bioretention pond with anaerobic and aerobic chambers, each containing specific substrate layers, connected by water transfer and collecting pipes, and equipped with a ventilation pipe for oxygenation, using pyrite for nitrogen and phosphorus removal, and a modular design determined by local conditions to enhance pollutant removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual experience is used to determine substrate adding proportion, then construction is simpler, but nitrogen and phosphorus removal capacity is reduced
Solution Approach 1:
The patent applies parameter changes by establishing quantitative proportion ranges for different substrates (gravel: 30-50%, planting soil: 30-50%, pyrite sand: 10-20%) instead of relying on manual experience. This quantitative parameter specification ensures optimal substrate composition for maximizing nitrogen and phosphorus removal capacity while maintaining construction feasibility through standardized ratios.
Solution Approach 2:
The patent uses composite materials by combining multiple substrates (gravel, planting soil, pyrite sand) in specific proportions to create a composite substrate mixture. This composite approach leverages the complementary properties of each material: gravel for drainage, planting soil for plant growth and filtration, and pyrite sand for chemical nitrogen removal, achieving superior overall pollutant removal capacity.
2Device complexity
If existing bioretention pond structure is used, then construction is simpler, but pollutant removal efficiency is insufficient in mountainous cities
Solution Approach 1:
The patent applies local quality by adapting the bioretention pond structure to mountainous city conditions. It incorporates steep slope adaptation with modular chamber design, optimized substrate layers for localized pollutant removal, and adjusted hydraulic flow paths suitable for mountainous terrain. This localized customization enhances pollutant removal efficiency while maintaining reasonable structural complexity.
Solution Approach 2:
The patent uses segmentation by dividing the bioretention pond into multiple functional chambers (anaerobic chamber, aerobic chamber, sedimentation chamber) with distinct substrate compositions and functions. This segmented design allows each chamber to be optimized for specific pollutant removal processes, improving overall efficiency while enabling modular construction that simplifies implementation in mountainous areas.
3Ease of manufacture
If substrate proportion is not quantitatively controlled, then construction is easier, but removal capacity for nitrogen and phosphorus is reduced
Solution Approach 1:
The patent applies parameter changes by establishing quantitative proportion ranges for different substrates (gravel: 30-50%, planting soil: 30-50%, pyrite sand: 10-20%) instead of relying on manual experience. This quantitative parameter specification ensures optimal substrate composition for maximizing nitrogen and phosphorus removal capacity while maintaining construction feasibility through standardized ratios.
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 modular bioretention pond achieves improved nitrogen and phosphorus removal, flood control, and water management, ensuring stable substrate ratios and land savings, suitable for mountainous terrain, while allowing purified stormwater reuse.
Implementation Method 1
a pyrite layer, a transition layer, and a gravel layer in sequence from top to bottom
Implementation Method 2
the ventilation pipe is configured to provide oxygen to the aerobic chamber to improve a stormwater purification efficiency
Implementation Method 3
the anaerobic chamber and the aerobic chamber are connected at the gravel layer by a water transfer pipe
Implementation Method 4
a substrate in the anaerobic chamber is the same as that of the aerobic chamber, including a gravel distribution layer, a planting layer
Data Source
AI summary
An assembled bioretention pond with nitrogen and phosphorus removal functions includes: a water collecting tank and a plurality of modules. Each module includes an anaerobic chamber and an aerobic chamber, a substrate in the anaerobic chamber is the same as that of the aerobic chamber, including a gravel distribution layer, a planting layer, a pyrite layer, a transition layer, and a gravel layer in sequence from top to bottom, and a ventilation pipe is vertically provided in the aerobic chamber and extends to the gravel layer, a water drainage pipe is mounted on a top of one side of the anaerobic chamber, a main pipe is mounted on a top of one side of the aerobic chamber and connected to a municipal stormwater pipe, a plurality of auxiliary pipes are arranged in the water collecting tank. This solution improves the ability to remove nitrogen and phosphorus pollutants from stormwater.