Landfill Leachate Treatment via Catalytic Oxidation and Biological Filtration
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Solution Overview
Problem
Current wastewater treatment methods for refuse landfill leachate, which have high concentrations of ammonia and nitrogen, are inefficient, costly, and prone to secondary pollution, failing to meet stringent environmental standards due to difficulties in degrading refractory organic compounds and low nitrogen removal effectiveness.
Innovation Solution
A multi-stage anoxic/aerobic pool system combined with a membrane biological reactor and catalytic oxidation tower, followed by a biological carbon filter, which uses ozone and catalysts to degrade organic compounds and nitrobacteria to remove ammonia and nitrogen, ensuring high-quality output water meets national standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical-chemical methods are used to treat high concentration ammonia and nitrogen wastewater, then treatment cost increases, but nitrogen removal effectiveness remains low
Solution Approach 1:
The treatment process is divided into multiple stages: pre-treatment (screening, adjustment), anaerobic treatment for organic matter degradation, aerobic treatment for ammonia nitrogen conversion, and filtration for final purification. Each stage targets specific contaminants, improving overall nitrogen removal effectiveness while optimizing cost distribution across stages
Solution Approach 2:
The system changes operational parameters dynamically - adjusting pH values (adding alkali in aerobic section), controlling dissolved oxygen levels (aerobic vs anaerobic conditions), and adjusting flow rates through the multi-stage process. These parameter changes enable efficient nitrogen transformation and removal at optimized cost
2Reliability
If conventional wastewater treatment technology is used, then infrastructure cost is reduced, but the technology cannot meet current environmental standards for treated wastewater
Solution Approach 1:
The system uses a multi-stage A/O process with separate anaerobic and aerobic sections, followed by filtration. This segmented approach achieves compliance with environmental standards by treating different contaminants in dedicated stages, while the modular structure manages infrastructure complexity through systematic organization
Solution Approach 2:
The pre-treatment stage (screening, adjustment tank) performs preliminary removal of suspended solids and adjustment of wastewater characteristics before main treatment. This preliminary action protects downstream equipment and improves overall system efficiency, enabling compliance without excessive infrastructure complexity
3Reliability
If bio-chemistry methods are used to degrade refractory organic compounds, then treatment time increases, but degradation effectiveness remains insufficient
Solution Approach 1:
Organic compound degradation is divided into anaerobic degradation in the first stage (breaking down complex organics) and aerobic degradation in subsequent stages (completing mineralization). This segmentation achieves high degradation effectiveness by using different biological pathways optimized for different organic types, while reducing total treatment time through parallel processing capacity
Solution Approach 2:
The system changes environmental parameters between stages - switching from anaerobic to aerobic conditions, adjusting temperature and pH optima for different microbial communities. These parameter changes enable efficient degradation of refractory organics at reduced treatment time by matching conditions to substrate requirements
4Object-generated harmful factors
If ordinary wastewater treatment technology is used, then operational cost is reduced, but secondary pollution occurs and nitrogen removal effect is low
Solution Approach 1:
The anaerobic stage converts refractory organic compounds into biodegradable intermediates, transforming harmful substances into treatable forms. The aerobic stage then converts ammonia nitrogen into nitrate, and the filtration stage removes remaining contaminants. This sequence converts harmful factors into beneficial treatment steps, achieving low secondary pollution with optimized operational cost
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 integrated system efficiently reduces pollution, achieves high nitrogen removal, and meets environmental standards with lower operational and infrastructure costs, providing stable and flexible operation while preventing equipment damage from suspended substances.
Implementation Method 1
lifting the adjusted wastewater by the water pump via a filter to thus remove fibers, small particles and suspended substances
Implementation Method 2
Degrading organic compounds and improving the bio-degradability of the wastewater in the catalytic oxidation tower through catalysis reaction and oxidation of ozone
Implementation Method 3
the suspended substances (hereinafter SS) being blocked by the active carbon due to the attraction function of the active carbon
Implementation Method 4
The organic substances in the wastewater are degraded due to the metabolism of microorganisms and the ammonia and nitrogen in the wastewater are removed due to the function of nitrobacteria and denitrifying bacteria
Data Source
AI summary
This invention relates to a refuse landfill leachate wastewater treatment system comprising a collection well, an adjustment tank, a filter, a comprehensive treatment system having a multi-stage anoxic/aerobic pool and a membrane biological reactor. The process of treatment is: waste water enters a adjustment tanke in which water quality and quantity are adjusted; subsequently, enters a filter, the water discharged from the filter and enters a comprehensive treatment system having a multi-stage anoxic/aerobic pool and a membrane biological reactor, wherein waster water is bio-chemically treated to remove the organic substances, nitrogen and ammonia, and then the wastewater is discharged into a catalyzed oxidation tower; the organic substance in waste water is oxidized on effect of ozone and under the existing catalyst function and then the biochemical capacity thereof is enhanced; and then the catalyzed and oxidized waste water enters carbon filter pool, the remaining contaminated matter can be further removed by degradation of the anoxic oxidation of the biological membrane on the packing material in pool, then the output water meets the requirement of National Standard or other relevant industrial standards.