Flow Deflector Rough Surface Anammox Nitrogen Removal
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Solution Overview
Problem
Current municipal sewage nitrogen removal technologies face challenges in achieving stable nitritation and efficient nitrite accumulation in low-temperature, low-ammonia environments, leading to complex inhibition of nitrobacteria and high material consumption.
Innovation Solution
A municipal sewage nitrogen removal treatment device and method utilizing a reaction pool with a surface aerator, flow deflectors, and a reflux pipeline to control dissolved oxygen and sludge settlement, allowing original microorganisms to attach and grow on flow deflecting channels, and inoculating anammox sludge to maintain low suspended sludge concentrations and high functional microorganism abundance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional nitrification and denitrification processes are used for nitrogen removal, then nitrogen removal can be achieved, but organic matter consumption is high, sludge yield is high, and power consumption is high
Solution Approach 1:
The patent changes the nitrogen removal pathway by using partial nitritation-anammox process instead of traditional nitrification-denitrification. This involves controlling dissolved oxygen parameters to enable partial conversion of ammonia to nitrite, then using anammox bacteria to convert nitrite and remaining ammonia to nitrogen gas, thereby reducing organic carbon demand and sludge production
Solution Approach 2:
The patent uses flow deflectors with rough surfaces that replicate natural substrate structures to provide attachment sites for microorganisms. The deflectors create micro-environments that copy favorable conditions for anammox and nitritation bacteria growth, enabling efficient nitrogen removal without requiring high organic matter inputs
2Quantity of substance
If high aeration rate is applied to enhance nitrogen removal, then nitrogen removal efficiency improves, but power consumption increases
Solution Approach 1:
The patent employs surface aerators that utilize pneumatic principles to provide dissolved oxygen at the water surface, which then diffuses throughout the reaction pool. This hydraulic approach distributes oxygen more efficiently than mechanical aeration, reducing power consumption while maintaining adequate dissolved oxygen levels for partial nitritation and anammox processes
Solution Approach 2:
The patent optimizes dissolved oxygen parameters by controlling aeration to maintain low but sufficient oxygen levels (0.2-0.8 mg/L) that favor anammox bacteria while preventing complete oxidation. This parameter control reduces aeration energy requirements compared to traditional high-rate aeration systems
3Quantity of substance
If partial nitritation-anammox process is used for high ammonia industrial wastewater, then material consumption is reduced and nitrogen removal efficiency is high, but the process cannot be effectively applied to municipal sewage with low concentration ammonia nitrogen
Solution Approach 1:
The patent creates local high-ammonia zones within the reaction pool by controlling flow patterns through deflectors. This allows partial nitritation-anammox to occur in localized regions where ammonia concentration is sufficient, while the overall system can treat municipal sewage with lower average ammonia concentrations. The rough-surfaced deflectors create micro-environments with concentrated microorganisms and substrates
Solution Approach 2:
The patent transitions from treating the entire reaction pool as a homogeneous system to creating spatially differentiated zones using flow deflectors. The deflectors divide the reaction pool into regions with different flow characteristics and microorganism concentrations, enabling partial nitritation-anammox to occur in specific zones while the rest of the pool handles lower concentration flows
4Reliability
If complex inhibition of nitrobacteria occurs in partial nitritation treatment of municipal sewage, then treatment stability decreases, but increasing microorganism concentration increases material consumption
Solution Approach 1:
The patent introduces flow deflectors as intermediary structures that mediate between the bulk liquid and microorganism populations. The rough surfaces of the deflectors provide attachment sites for biofilms, creating a protective interface that stabilizes microorganism communities and reduces their sensitivity to inhibitory conditions in the bulk liquid
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 approach improves the working efficiency of nitrogen treatment and reduces material consumption by controlling dissolved oxygen and sludge settlement, stabilizing the nitritation process, and maintaining low nitrobacteria levels, thus enhancing the overall nitrogen removal process.
Implementation Method 1
A surface aerator is arranged in the reaction pool, which can provide dissolved oxygen and can be configured to enhance liquid stirring
Implementation Method 2
The sidewall of the flow deflecting channel is a rough surface, and microorganisms in the reaction pool can attach to the sidewall of the flow deflecting channel
Implementation Method 3
The reaction pool includes a reaction zone and a settling zone, the settling zone is located at the bottom of the reaction zone
Data Source
AI summary
Disclosed is a municipal sewage nitrogen removal treatment device, comprising a reaction pool. A water inlet pipeline, a water outlet pipeline and a reflux pipeline are connected to the reaction pool, and the reflux pipeline communicates with the water inlet pipeline by using a reflux element. A surface aerator is arranged in the reaction pool. The reaction pool comprises a reaction zone and a settling zone, the settling zone is located at the bottom of the reaction zone, and the reaction zone is provided with a flow deflector. The flow deflector is provided with a plurality of flow deflecting channels, the sidewall of the flow deflecting channel is a rough surface, and microorganisms in the reaction pool are able to attach to the sidewall of the flow deflecting channel. The present disclosure further provides a treatment method using the municipal sewage nitrogen removal treatment device above.