Microbial Consortium Reduces Bio-Sludge in Refinery Wastewater
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Solution Overview
Problem
Current methods for hydrocarbon refinery wastewater treatment face challenges such as high bio-sludge production, energy-intensive biomass recovery, and disruption from seasonal variations and shock loads, which affect carbon removal and sludge compaction properties.
Innovation Solution
A process utilizing a microbial consortium comprising Pseudomonas and Bacillus species with specific hydrocarbon-degrading genes, optimized for low bio-sludge production, tolerance to hydrocarbon loads, and reduced exopolysaccharide production, which degrades aromatics, aliphatics, and toxic metals, and operates without biomass recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If activated sludge process is used for biological treatment, then carbon removal is achieved, but high bio-sludge production occurs
Solution Approach 1:
The patent changes the biological parameters by introducing specific microbial consortia with optimized catabolic gene pools and metabolic pathways. This alters the fundamental biology of the treatment system to achieve complete mineralization of hydrocarbons to CO2 and H2O, thereby removing carbon without generating excess sludge biomass
Solution Approach 2:
The patent converts the harmful effect of hydrocarbon contamination into a beneficial outcome by using the hydrocarbons as substrate for complete mineralization. The microorganisms metabolize the hydrocarbons completely to CO2 and H2O, transforming the pollutant into harmless end products without generating sludge, thus turning the harmful substance into a useful energy source for the bacteria
2Reliability
If biomass recycling is implemented, then treatment efficiency is maintained, but energy consumption increases
Solution Approach 1:
The patent extracts and eliminates the biomass recycling step from the conventional activated sludge process. By using microbial consortia that achieve complete mineralization, the system maintains treatment efficiency without the need to recycle biomass, thereby removing the energy-intensive centrifugation and re-inoculation operations
Solution Approach 2:
The microbial consortia are designed to maintain their own population and activity levels within the reactor without requiring external biomass supplementation. The complete mineralization process ensures that carbon is converted to gaseous CO2 rather than accumulating as sludge, allowing the system to self-regulate without energy-consuming recycling operations
3Object-generated harmful factors
If conventional microbial treatment is used, then organic contaminants are degraded, but disruption occurs under shock loads
Solution Approach 1:
The patent uses a composite microbial consortium comprising multiple species (Pseudomonas, Bacillus, and other hydrocarbon-degrading bacteria) with complementary metabolic capabilities. This diversity provides functional redundancy and robustness, allowing the system to maintain stable hydrocarbon degradation under varying conditions and shock loads that would disrupt conventional single-strain systems
Solution Approach 2:
The microbial consortium is designed with multi-functional catabolic pathways capable of degrading various types of hydrocarbons (aliphatic, aromatic, PAHs) and tolerating different environmental conditions. This universal degradation capability ensures reliable performance across varying wastewater compositions and shock loads
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 process achieves significant reduction in bio-sludge production, improved carbon removal efficiency, and tolerance to shock loads, with minimal environmental impact and complete mineralization of hydrocarbons under aerobic conditions, reducing chemical oxygen demand and other contaminants.
Implementation Method 1
The unrecoverable oil and grease and other organic contaminants are reduced by microbial catabolism in aeration chambers by activated sludge process
Implementation Method 2
complete mineralization of hydrocarbons under aerobic conditions
Implementation Method 3
determine the period of aeration of the biomass in order to maintain a predetermined oxygen utilization rate
Data Source
Figure 1
AI summary
A process for treatment of hydrocarbon refinery wastewater producing a low bio-sludge and said process comprises utilizing microbial consortia comprising at least one species of Pseudomonas and at least one species of Bacillus in a ratio of 10:1 to 1:10, wherein species of Pseudomonas and species of Bacillus have constitutive expression of at least one hydrocarbon degrading gene, wherein the species of Pseudomonas are selected from the group consisting of Pseudomonas stutzeri (MTCC 25027), Pseudomonas aeruginosa (MTCC 5389), Pseudomonas aeruginosa strain IOC DHT (MTCC, 5385), Pseudomonas putida IOCRI (MTCC 5387), Pseudomonas putida IOC5al (MTCC 5388) and a mutant thereof, wherein the species of Bacillus are selected from the group consisting of Bacillus subtilis (MTCC 25026), Bacillus substilis (MTCC 5386), Bacillus thermoleovorans (MTCC 25023), Bacillus stearothermophilus (MTCC 25030), Lysinibacillus sp. (MTCC 25029), Lysinibacillus sp. (MTCC 5666) and a mutant thereof, and wherein the microbial consortia is used in concentration of at least 102 cfu/ml.