Step-Feed Partial Nitrification and Anammox for Landfill Leachate
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Solution Overview
Problem
Existing landfill leachate treatment processes face challenges due to high ammonia nitrogen concentrations and complex components, and traditional nitrification-denitrification processes require external carbon sources, while surplus sludge production is significant without effective treatment.
Innovation Solution
A step-feed partial nitrification coupling anaerobic ammonia oxidation process is implemented, where ammonia-rich landfill leachate undergoes partial nitrification in a PN-SBR, followed by integrated fermentation and denitrification with surplus sludge in an IFD-SBR, and finally, effluent from IFD-SBR is processed in a PNA-SBR through Anammox, utilizing a controlled aeration and anoxic stages to remove nitrogen without external carbon sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional nitrification-denitrification process is used to treat landfill leachate, then nitrogen removal can be achieved, but external carbon sources are required and treatment cost increases
Solution Approach 1:
The system uses surplus sludge as an internal carbon source for denitrification, making the treatment process self-sufficient. The surplus sludge containing organic carbon is introduced into the anoxic reactor to provide carbon for denitrification, eliminating the need for external carbon source addition and achieving carbon self-sufficiency in the nitrogen removal process
Solution Approach 2:
The patent merges surplus sludge treatment with landfill leachate treatment in a single integrated system. The anoxic reactor simultaneously performs denitrification of landfill leachate and fermentation of surplus sludge, combining two separate treatment functions into one process that achieves both nitrogen removal and carbon utilization
2Quantity of substance
If traditional nitrification process is applied to landfill leachate, then nitrogen can be removed, but high aeration energy consumption is required
Solution Approach 1:
The nitrogen removal process is segmented into partial nitrification and anaerobic ammonia oxidation stages. Instead of complete nitrification requiring high aeration, the system performs partial nitrification to nitrite followed by anammox, reducing the aeration energy consumption while maintaining effective nitrogen removal
Solution Approach 2:
The system changes the oxidation state parameter by stopping at nitrite (partial nitrification) instead of proceeding to nitrate, and then utilizing anaerobic ammonia oxidation to convert nitrite and ammonia to nitrogen gas. This parameter change in the oxidation pathway significantly reduces the energy required for aeration while achieving the same nitrogen removal goal
3Productivity
If surplus sludge is produced during sewage treatment, then treatment process is complete, but large amount of sludge requires additional treatment resources
Solution Approach 1:
The surplus sludge is utilized as a resource rather than waste, serving as the carbon source for denitrification. By introducing surplus sludge into the anoxic reactor, the system enables the sludge to serve its own treatment purpose while simultaneously providing carbon for nitrogen removal, achieving self-service and eliminating the need for separate sludge disposal
4Quantity of substance
If carbon source is added to enhance denitrification, then nitrogen removal improves, but treatment cost and complexity increase
Solution Approach 1:
The system eliminates external carbon source addition by using surplus sludge as the internal carbon source. The surplus sludge containing organic carbon is directly introduced into the anoxic reactor, providing the necessary carbon for denitrification without requiring external carbon source systems, thereby simplifying the overall treatment device complexity
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 process achieves efficient nitrogen removal from landfill leachate and reduces excess sludge production, saving energy and eliminating the need for external carbon sources, while optimizing reaction conditions for enhanced treatment efficiency.
Implementation Method 1
ammonia is oxidized into nitrite in aeration stage
Implementation Method 2
the generated nitrite combined with ammonia contained in secondary influent are further removed through anaerobic ammonia oxidation process (Anammox) in anoxic stage
Implementation Method 3
exogenous surplus sludge coupled with the PN-SBR effluent are input to an anoxic sequencing batch reactor for achieving integrated fermentation and denitrification process
Data Source
AI summary
Disclosed is an apparatus and method for synchronously treating sewage and sludge through a step-feed partial nitrification coupling anaerobic ammonia oxidation process, belonging to the biological treatment field. Ammonia rich landfill leachate is firstly pumped into an aerobic reactor to realize partial nitrification process; exogenous surplus sludge coupling with partial nitrification reactor effluent are input to an anoxic reactor together for achieving integrated fermentation and denitrification process; finally, effluent from the anoxic reactor is pumped into an integrated autotrophic nitrogen removal reactor by a step-feed mode, the integrated reactor contains two main running units of aeration and anoxic stirring, ammonia is oxidized into nitrite in aeration stage, and the generated nitrite and ammonia contained in secondary influent are further removed through anammox process which operates stably and reliably, realizes efficient nitrogen removal from landfill leachate without external carbon source addition, and realizes the purpose of exogenous excess sludge reduction simultaneously.