External Acceleration System for Biological Denitrification
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Solution Overview
Problem
Current wastewater treatment systems face challenges in achieving efficient and stable denitrification due to the mutual interference and different environmental requirements of sulfur-disproportionating bacteria and denitrifying bacteria, as well as fluctuations in wastewater quality and quantity.
Innovation Solution
An external acceleration system is developed that decouples the sulfur disproportionation reaction from the sulfur-based autotrophic denitrification reaction, using an external denitrification accelerator to enhance the sulfur disproportionation reaction and provide sulfide and polysulfide as electron donors for denitrification, thereby optimizing conditions for both types of bacteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sulfur disproportionation reaction is coupled with sulfur-based autotrophic denitrification reaction in the same system, then denitrification acceleration is achieved, but system stability deteriorates due to mutual interference between bacteria
Solution Approach 1:
The patent divides the treatment system into two separate reactors: a sulfur disproportionation reactor and a denitrification reactor. This segmentation allows each bacterial population to thrive in its optimal environment independently, while still achieving the combined effect of sulfur activation and nitrate removal. The physical separation eliminates mutual interference between the two bacterial groups.
Solution Approach 2:
The patent extracts the sulfur disproportionation process from the denitrification system and places it in a separate reactor. This extraction resolves the contradiction by allowing the sulfur-disproportionating bacteria to operate independently under their optimal conditions (anaerobic, alkaline environment) while the denitrifying bacteria operate under their own optimal conditions (anoxic, nitrate-rich environment).
2Adaptability or versatility
If different environmental conditions are provided for sulfur-disproportionating bacteria and denitrifying bacteria, then optimal growth for each bacterium is achieved, but system complexity increases
Solution Approach 1:
By segmenting the system into two separate reactors, each can be optimized for its specific bacterial population without compromising the other. The sulfur disproportionation reactor provides anaerobic, alkaline conditions with sufficient carbon source, while the denitrification reactor provides anoxic conditions with nitrate. This segmentation achieves optimal adaptability for each bacterium while keeping the overall system structure relatively simple through modular design.
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 system improves the stability and efficiency of denitrification by preventing mutual interference between the two bacteria, allowing for optimal growth conditions for each, and enhancing the adaptability of the denitrification process to various systems, reducing operational costs and carbon emissions.
Implementation Method 1
The sulfur disproportionation reaction is a biochemical reaction process mediated by autotrophic sulfur-disproportionating bacteria, which may convert S0 into sulfide and sulfate
Implementation Method 2
Sulfide may synthesize polysulfide (Sn2−) with S0 in neutral to alkaline environments
Implementation Method 3
Once generated, HS− and Sn2− can be rapidly utilized by sulfur-oxidizing denitrifying bacteria to realize rapid nitrate reduction
Data Source
AI summary
Disclosed is an external acceleration system for a biological denitrification process during wastewater treatment, including a biological denitrification mechanism, a denitrification acceleration mechanism, and a water circulation mechanism, where the biological denitrification mechanism includes a biological denitrification tank, a three-way valve, a wastewater assembly, and a water inlet pipe; the denitrification acceleration mechanism includes a denitrification accelerator and an assembly for enhancing the sulfur disproportionation reaction; the water circulation mechanism includes a first water delivery pump, a first water delivery pipe, a second water delivery pipe, and a second water delivery pump. The external acceleration system for a biological denitrification process during wastewater treatment spatially and temporally separates the sulfur disproportionation reaction process from the biological denitrification process so that the two processes do not interfere with each other and mutually promote the denitrification effect, which is beneficial to ensure the high efficiency and stability of the denitrification effect. The independently provided denitrification accelerator releases the coupling of the sulfur disproportionation reaction and the autotrophic denitrification reaction in the related art and has a high adaptability to various denitrification systems.