Sludge Fermentation Carbon Source for Landfill Leachate Nitrogen Removal
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Solution Overview
Problem
Mature landfill leachate poses a challenge for traditional biological nitrogen removal processes due to its low carbon-nitrogen ratio, leading to inefficient nitrogen removal and excessive sludge production.
Innovation Solution
A method and device utilizing sludge fermentation products as a carbon source, implemented in a PNA-SBR operating in an anoxic/anaerobic/oxic mode, followed by a DN-SBR in an anaerobic/oxic/anoxic mode, to enhance nitrogen removal and reduce sludge volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional biological nitrogen removal process is used for mature landfill leachate, then the process is simple and easy to operate, but the nitrogen removal efficiency is low due to insufficient carbon source
Solution Approach 1:
The system uses excess sludge fermentation products as carbon source, allowing the treatment process to serve itself by converting waste sludge into useful carbon source for denitrification, eliminating the need for external carbon source addition and maintaining operational simplicity while improving nitrogen removal efficiency
Solution Approach 2:
The patent changes the carbon source parameter from external organic carbon to internally generated sludge fermentation products, transforming the carbon-nitrogen ratio parameter to match the requirements of denitrifying bacteria, thereby improving nitrogen removal efficiency without complicating the operation
2Productivity
If external organic carbon source is added to improve nitrogen removal, then the nitrogen removal efficiency increases, but the treatment cost increases greatly
Solution Approach 1:
The system recovers useful carbon source from excess sludge through fermentation, converting what would be waste material into a valuable resource for denitrification, thereby eliminating the need to purchase external carbon sources and reducing treatment costs while maintaining high nitrogen removal efficiency
Solution Approach 2:
The treatment system generates its own carbon source through sludge fermentation, making it self-sufficient and eliminating dependency on external carbon source addition, which reduces operational costs while achieving effective nitrogen removal
3Productivity
If external carbon source is added for denitrification, then the nitrogen removal efficiency improves, but a large amount of excess sludge is produced
Solution Approach 1:
The system converts excess sludge, which is a harmful waste product requiring disposal, into a beneficial carbon source through fermentation, thereby solving both the nitrogen removal requirement and the excess sludge disposal problem simultaneously, reducing sludge volume by 50%-60% while achieving effective denitrification
4Loss of substance
If excess sludge is reduced by 50%-60% through fermentation, then the sludge disposal problem is solved, but the fermentation process complexity increases
Solution Approach 1:
The patent merges the sludge fermentation process with the existing activated sludge treatment system, integrating carbon source generation into the ongoing operational workflow, thereby achieving sludge reduction without requiring completely separate complex fermentation facilities, maintaining relatively simple overall system structure
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
Achieves a 96.0% total nitrogen removal rate and significantly reduces excess sludge volume, while minimizing operational costs by using internally generated carbon sources.
Implementation Method 1
A large amount of short-chain fatty acids can be produced through alkaline anaerobic fermentation
Implementation Method 2
Traditional wastewater biological nitrogen removal converts NH4+−N into NO3-−N through nitrification
Implementation Method 3
converts NO3-−N into nitrogen to escape from water through denitrification. In the denitrification stage, microorganisms use NO3-−N as an electron acceptor and organic matters as an electron donor
Implementation Method 4
after the water enters an anaerobic stage, an anaerobic ammonia oxidation reaction occurs, and part of ammonia nitrogen and the excess nitrite nitrogen in the raw water are removed at the same time to generate nitrate nitrogen
Data Source
AI summary
Disclosed are a method and device for realizing advanced nitrogen removal of mature landfill leachate and sludge reduction by using sludge fermentation products as carbon source, belonging to the field of biological treatment of sludge of high ammonia nitrogen wastewater. The mature landfill leachate first enters a PNA-SBR, the reactor operates in an anoxic/anaerobic/oxic (A/A/O) mode, denitrification is performed at an anoxic state; then anaerobic ammonia oxidation is performed at an anaerobic stage to remove part of ammonia nitrogen and nitrite nitrogen; partial nitrification is performed at an oxic stage to remove the ammonia nitrogen; discharged water is pumped into a DN-SBR, meanwhile, an excess sludge fermentation mixture is added, the reactor operates in an anoxic/anaerobic/oxic (A/A/O) mode, organic matters in the sludge fermentation mixture are used for denitrification at an anoxic stage, and meanwhile, microorganisms store an inner carbon source; ammonia nitrogen brought by the fermentation mixture is removed at an anaerobic stage; and denitrification is performed through the inner carbon source at an oxic stage. The remarkable sludge reduction effect is achieved while a removal rate of TN achieves 96.0%, and the method and the device are suitable for advanced removal of the high ammonia nitrogen wastewater.