Bioaugmentation System for Landfill Leachate Denitrification
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Solution Overview
Problem
Current landfill leachate treatment methods face challenges in achieving high denitrification efficiency due to the separation of nitrate reduction and biological activity enhancement, and inefficient use of electric energy, particularly in high-salinity environments.
Innovation Solution
A bioaugmentation system comprising a water collecting pool, an aerobic pool, a weak electrical stimulation anoxic pool, a micro electrical stimulation anoxic pool, and a sedimentation pool, where different DC voltages are applied based on conductivity to enhance salt tolerance and decontamination performance of microorganisms, using graphite electrode plates and specific bacterial strains for improved denitrification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional biological methods are used for landfill leachate treatment, then the treatment process is simple and easy to operate, but the microorganisms suffer from osmotic imbalance due to high salinity and cannot survive, resulting in poor denitrification efficiency
Solution Approach 1:
The patent changes the electrical parameters (voltage and current) applied to the anoxic pool to enhance microorganism activity. By applying specific electrical stimulation (0.5-2.0V voltage, 0.1-0.5A current), the system improves microorganism survival and denitrification efficiency in high-salinity conditions without complicating the overall treatment process
2Device complexity
If the nitrate reduction process is separated from biological activity enhancement, then the process design is simple, but the denitrification efficiency is limited
Solution Approach 1:
The patent merges nitrate reduction with biological activity enhancement by applying electrical stimulation directly to the anoxic pool where denitrifying bacteria reside. This combination allows the same biological process to simultaneously reduce nitrates and enhance microbial activity, eliminating the need for separate treatment stages while improving denitrification efficiency
3Reliability
If high electrical energy is consumed to enhance biological activity in high-salinity environments, then microorganism decontamination performance improves, but the energy consumption increases significantly
Solution Approach 1:
The patent applies partial electrical stimulation rather than continuous high-energy input. By using controlled, moderate electrical parameters (0.5-2.0V voltage, 0.1-0.5A current) only in the anoxic pool during specific operational phases, the system enhances decontamination performance while avoiding excessive energy consumption that would occur with continuous high-power treatment
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 effectively removes nitrogen pollutants from landfill leachate while minimizing electric energy consumption, enhancing denitrification efficiency and biological activity in complex water environments.
Implementation Method 1
different DC voltages are applied based on conductivity to enhance salt tolerance and decontamination performance of microorganisms
Implementation Method 2
anoxic sludge with denitrifying bacteria as dominant strain is provided in the weak electrical stimulation anoxic pool
Implementation Method 3
anoxic sludge with anammox bacteria as dominant strain is provided in the micro electrical stimulation anoxic pool
Implementation Method 4
aerobic sludge with nitrifying bacteria as dominant strain is provided in the aerobic pool
Implementation Method 5
using graphite electrode plates and specific bacterial strains for improved denitrification
Data Source
AI summary
Provided is a bioaugmentation system for denitrification of landfill leachate. The bioaugmentation system includes a water collecting pool, an aerobic pool, a weak electrical stimulation anoxic pool, a micro electrical stimulation anoxic pool, and a sedimentation pool, all of which are connected sequentially, wherein a uniform aeration device is arranged at a bottom of the aerobic pool; a first stirring device and a second stirring device are arranged in the weak electrical stimulation anoxic pool and the micro electrical stimulation anoxic pool, respectively; a sludge recycling outlet of the sedimentation pool is connected to a sludge recycling inlet of the aerobic pool through a first external pipeline; a first electrode plate group and a second electrode plate group which are connected to a first power supply and a second power supply respectively are arranged in the weak electrical stimulation anoxic pool and the micro electrical stimulation anoxic pool, respectively.