Bacterial Consortium for Perchlorate Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for removing perchlorate and nitrate from contaminated matrices are limited by non-selectivity, high operational costs, and lack of degradation to non-toxic compounds, with existing biological approaches facing challenges in high salt and extreme pH conditions.
Innovation Solution
A novel bioprocess using a mixed bacterial consortium dominated by Halomonas sp. NIIST-PRB-02, Bacillus sp. NIIST-PRB-03, and Serratia marcescens strain NIIST5, which can tolerate high salt, extreme pH, and high perchlorate levels, effectively reducing perchlorate and nitrate to non-toxic chloride and nitrogen under anoxic conditions using organic substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If non-biological methods (ion exchange, reverse osmosis, electrodialysis, adsorption) are used to remove perchlorate, then perchlorate can be removed from contaminated matrices, but the processes have limited applications due to non-selectivity, high operational cost and requirement for secondary treatment strategy
Solution Approach 1:
The bacterial consortium performs self-regeneration by utilizing perchlorate and nitrate as electron acceptors in their respiratory metabolism. The organisms naturally reduce these contaminants to non-toxic chloride and nitrogen gases without requiring external energy input or complex operational interventions, thereby eliminating the need for costly secondary treatment strategies.
Solution Approach 2:
The invention changes the fundamental parameter of removal mechanism from physical/chemical separation (ion exchange, adsorption) to biological transformation (reduction). This parameter change enables complete degradation to non-toxic compounds while reducing operational costs through natural metabolic processes of the bacterial consortium.
2Quantity of substance
If non-biological methods are used to remove perchlorate, then perchlorate can be physically removed from contaminated matrix, but the processes only physically remove (no degradation to non-toxic chloride)
Solution Approach 1:
The invention converts the harmful perchlorate ion into beneficial non-toxic chloride through biological reduction. The bacterial consortium utilizes perchlorate as a terminal electron acceptor in anaerobic respiration, transforming it from a toxic compound into harmless chloride ions, thereby eliminating toxicity rather than merely removing the substance.
Solution Approach 2:
The bacterial consortium employs strong respiratory metabolism with perchlorate as terminal electron acceptor, creating an accelerated redox process that completely degrades perchlorate to non-toxic chloride. This biological oxidation/reduction process is more effective than physical removal methods in eliminating toxicity.
3Object-generated harmful factors
If biological approaches are used for perchlorate treatment, then complete reduction to non-toxic chloride is achieved, but the approaches face challenges in high salt and extreme pH conditions
Solution Approach 1:
The bacterial consortium exhibits local quality adaptation where different species within the consortium are specialized for tolerating specific stress conditions. Halomonas species provide salt tolerance, while Bacillus and Serratia species contribute to extreme pH tolerance. This local specialization enables the overall system to function reliably under high salt and extreme pH conditions while maintaining complete perchlorate reduction.
Solution Approach 2:
The invention creates a composite biological system by combining multiple bacterial species (Halomonas, Bacillus, Serratia) with complementary tolerance characteristics. This composite consortium achieves both complete perchlorate reduction to non-toxic chloride and reliability under high salt and extreme pH conditions that single species cannot achieve alone.
4Device complexity
If a single bacterial species is used for perchlorate reduction, then the process is simple, but the consortium provides enhanced tolerance to high salt, extreme pH and high perchlorate levels
Solution Approach 1:
The invention merges multiple bacterial species (Halomonas sp., Bacillus sp., Serratia marcescens) into a functional consortium that combines their complementary traits. This merging provides enhanced adaptability to high salt, extreme pH, and high perchlorate concentrations while maintaining a relatively simple biological process that can be implemented in conventional reactors.
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
The bioprocess achieves complete reduction of perchlorate and nitrate across a wide concentration range, tolerating high salt and pH variations, making it suitable for treating contaminated water and solid matrices, including propellant wastewater and ion exchange resin regenerate solutions.
Implementation Method 1
PRB under anoxic condition utilize (per)chlorate as terminal electron sink, sequentially reducing it finally into chloride and oxygen
Implementation Method 2
The overall biochemical pathway involved in (per)chlorate reduction involves two key respiratory enzymes, perchlorate reductase which catalyze perchlorate and chlorate reduction
Implementation Method 3
The overall biochemical pathway involved in (per)chlorate reduction involves two key respiratory enzymes, perchlorate reductase which catalyze perchlorate and chlorate reduction
Implementation Method 4
chlorite dismutase (C/d)) catalyzes the splitting of chlorite (ClO2−) into chloride and molecular oxygen
Data Source
AI summary
The present invention discloses a novel microbial process for decontaminating (per)chlorate and/or nitrate containing matrices. A heterotrophic mixed microbial culture expressing the functional genes responsible for (per) chlorate and nitrate reduction is the major component of the process. The present process can be a better substitute for existing processes for decontaminating perchlorate contaminated propellant wastewater, ion exchange resin/regenerate solutions, etc. The consortium consists or comprises of Halomonas sp. NIIST-PRB-02 (MTCC No. 5911), Bacillus sp. NIIST-PRB-03 (MTCC No. 5912) and Serratia marcescens strain NIIST5 (MTCC No. 5821).